WO2000031376A2 - Method and system for accessing subterranean deposits from the surface - Google Patents

Method and system for accessing subterranean deposits from the surface Download PDF

Info

Publication number
WO2000031376A2
WO2000031376A2 PCT/US1999/027494 US9927494W WO0031376A2 WO 2000031376 A2 WO2000031376 A2 WO 2000031376A2 US 9927494 W US9927494 W US 9927494W WO 0031376 A2 WO0031376 A2 WO 0031376A2
Authority
WO
WIPO (PCT)
Prior art keywords
well bore
cavity
drilling
well
subterranean
Prior art date
Application number
PCT/US1999/027494
Other languages
French (fr)
Other versions
WO2000031376A3 (en
Inventor
Joseph A. Zupanick
Original Assignee
Cdx Gas, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22730357&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2000031376(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to PL99375242A priority Critical patent/PL193559B1/en
Priority to AT99965010T priority patent/ATE309449T1/en
Priority to PL99375241A priority patent/PL193558B1/en
Priority to PL99348705A priority patent/PL190694B1/en
Priority to PL99375240A priority patent/PL193557B1/en
Priority to NZ512303A priority patent/NZ512303A/en
Priority to PL375238A priority patent/PL192352B1/en
Priority to EP99965010A priority patent/EP1131535B1/en
Priority to PL99375236A priority patent/PL193560B1/en
Priority to PL99375239A priority patent/PL193562B1/en
Priority to PL99375243A priority patent/PL193555B1/en
Priority to PL99375237A priority patent/PL193561B1/en
Priority to CA002350504A priority patent/CA2350504C/en
Priority to DE69928280T priority patent/DE69928280T2/en
Priority to AU31018/00A priority patent/AU760896B2/en
Application filed by Cdx Gas, Llc filed Critical Cdx Gas, Llc
Publication of WO2000031376A2 publication Critical patent/WO2000031376A2/en
Publication of WO2000031376A3 publication Critical patent/WO2000031376A3/en
Priority to AU2003200203A priority patent/AU2003200203B2/en

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/09Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/006Production of coal-bed methane
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121Lifting well fluids
    • E21B43/13Lifting well fluids specially adapted to dewatering of wells of gas producing reservoirs, e.g. methane producing coal beds
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30Specific pattern of wells, e.g. optimizing the spacing of wells
    • E21B43/305Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • E21B7/046Directional drilling horizontal drilling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Definitions

  • the present invention relates generally to the recovery of subterranean deposits, and more particularly to a method and system for accessing subterranean deposits from the surface.
  • coal deposits- are not amendable to pressure fracturing and other methods often used for increasing methane gas production from rock formations.
  • pressure fracturing and other methods often used for increasing methane gas production from rock formations.
  • coal seams are often associated with subterranean water, which must be drained from the coal seam in order to produce the methane.
  • a further problem for surface production of gas from coal seams is the difficulty presented by under balanced drilling conditions caused by the porousness of the coal seam.
  • drilling fluid is used to remove cuttings from the well bore to the surface.
  • the drilling fluid exerts a hydrostatic pressure on the formation which, if it exceeds the hydrostatic pressure of the formation, can result in a loss of drilling fluid into the formation. This results in entrainment of drilling finds in the formation, which tends to plug the pores, cracks, and fractures that are needed to produce the gas .
  • the present invention provides an improved method and system for accessing subterranean deposits from the surface that substantially eliminates or reduces the disadvantages and problems associated with previous systems and methods.
  • the present invention provides an articulated well with a drainage pattern that intersects a horizontal cavity well.
  • the drainage patterns provide access to a large subterranean area from the surface while the vertical cavity well allows entrained water, hydrocarbons, and other deposits to be efficiently removed and/or produced.
  • a method for accessing a subterranean zone from the surface includes drilling a substantially vertical well bore from the surface to the subterranean zone.
  • An articulated well bore is drilled from the surface to the subterranean zone.
  • the articulated well bore is horizontally offset from the substantially vertical well bore at the surface and intersects the substantially vertical well bore at a junction proximate to the subterranean zone.
  • a substantially horizontal drainage pattern is drilled through the articulated well bore from the junction into the subterranean zone.
  • the substantially horizontal drainage pattern may comprise a pinnate pattern including a substantially horizontal diagonal well bore extending from the substantially vertical well bore that defines a first end of an area covered by the drainage pattern to a distant end of the area.
  • a first of substantially horizontal lateral well bores extend in space relation to each other from the diagonal well bore to the periphery of the area on a first side of the diagonal well bore.
  • a second set of substantially horizontal lateral well bores extend in space relation to each other from the diagonal well bore to the periphery of the area on a second, opposite side of the diagonal .
  • a method for preparing a subterranean zone for mining uses the substantially vertical and articulated well bores and the drainage pattern. Water is drained from the subterranean zone through the drainage pattern to the junction of the substantially vertical well bore. Water is pumped from the junction to the surface through the substantially vertical well bore. Gas is produced from the subterranean zone through at least one of the substantially vertical and articulated well bores. After degasification has been completed, the subterranean zone may be further prepared by pumping water and other additives into the zone through the drainage pattern.
  • a pump positioning device is provided to accurately position a downhole pump in a cavity of a well bore .
  • Technical advantages of the present invention include providing an improved method and system for accessing subterranean deposits from the surface.
  • a horizontal drainage pattern is drilled in a target zone from an articulated surface well to provide access to the zone from the surface.
  • the drainage pattern intersected by a vertical cavity well from which entrained water, hydrocarbons, and other fluids drained from the zone can be efficiently removed and/or produced by a rod pumping unit.
  • gas, oil, and other fluids can be efficiently produced at the surface from a low pressure or low porosity formation .
  • Another technical advantage of the present invention includes providing an improved method and system for drilling into low-pressure reservoirs.
  • a downhole pump or gas lift is used to lighten hydrostatic pressure exerted by drilling fluids used to remove cuttings during drilling operations.
  • reservoirs may be drilled at ultra-low pressures without loss of drilling fluids into the formation and plugging of the formation.
  • Yet another technical advantage of the present invention includes providing an improved horizontal drainage pattern for accessing a subterranean zone.
  • a pinnate structure with a main diagonal and opposed laterals is used to maximize access to a subterranean zone from a single vertical well bore. Length of the laterals is maximized proximate to the vertical well bore and decreased toward the end of the main diagonal to provide uniform access to a quadrilateral or other grid area. This allows the drainage pattern to be aligned with longwall panels and other subsurface structures for degasification of a mine coal seam or other deposit.
  • Still another technical advantage of the present invention includes providing an improved method and system for preparing a coal seam or other subterranean deposit for mining.
  • surface wells are used to degasify a coal seam ahead of mining operations. This reduces underground equipment and activities and increases the time provided to degasify the seam which minimizes shutdowns due to high gas content.
  • water and additives may be pumped into the degasified coal seam prior to mining operations to minimize dust and other hazardous conditions, to improve efficiency of the mining process, and to improve the quality of the coal product.
  • Still another technical advantage of the present invention includes providing an improved method and system for producing methane gas from a mined coal seam.
  • well bores used to initially degasify a coal seam prior to mining operations may be reused to collect gob gas from the seam after mining operation.
  • costs associated with the collection of gob gas are minimized to facilitate or make feasible the collection of gob gas from previously mined seams .
  • Still another technical advantage of the present invention includes providing a positioning device for automatically positioning down-hole pumps and other equipment in a cavity.
  • a rotatable cavity positioning device is configured to retract for transport in a well bore and to extend within a down-hole cavity to optimally position the equipment within the cavity. This allows down-hole equipment to be easily positioned and secured within the cavity.
  • FIGURE 1 is a cross-sectional diagram illustrating formation of a horizontal drainage pattern in a subterranean zone through an articulated surface well intersecting a vertical cavity well in accordance with one embodiment of the present invention
  • FIGURE 2 is a cross-sectional diagram illustrating formation of the horizontal drainage pattern in the subterranean zone through the articulated surface well intersecting the vertical cavity well in accordance with another embodiment of the present invention
  • FIGURE 3 is a cross-sectional diagram illustrating production of fluids from a horizontal draining pattern in a subterranean zone through a vertical well bore in accordance with one embodiment of the present invention
  • FIGURE 4 is a top plan diagram illustrating a pinnate drainage pattern for accessing deposits in a subterranean zone in accordance with one embodiment of the' present invention
  • FIGURE 5 is a top plan diagram illustrating a pinnate drainage pattern for accessing deposits in a subterranean zone in accordance with another embodiment of the present invention
  • FIGURE 6 is a top plan diagram illustrating a quadrilateral pinnate drainage pattern for accessing deposits in a subterranean zone in accordance with still another embodiment of the present invention
  • FIGURE 7 is a top plan diagram illustrating the alignment of pinnate drainage patterns within panels of a coal seam for degasifying and preparing the coal seam for mining operations in accordance with one embodiment of the present invention
  • FIGURE 8 is a flow diagram illustrating a method for preparing a coal seam for mining operations in accordance with one embodiment of the present invention
  • FIGURES 9A-C are cross-sectional diagrams illustrating a cavity well positioning tool in accordance with one embodiment of the present invention.
  • FIGURE 1 illustrates a cavity and articulated well combination for accessing a subterranean zone from the surface in accordance with one embodiment of the present invention.
  • the subterranean zone is a coal seam. It will be understood that other low pressure, ultra-low pressure, and low porosity subterranean zones can be similarly accessed using the dual well system of the present invention to remove and/or produce water, hydrocarbons and other fluids in the zone and to treat minerals in the zone prior to mining operations .
  • a substantially vertical well bore 12 extends from the surface 14 to a target coal seam 15.
  • the substantially vertical well bore 12 intersects, penetrates and continues below the coal seam 15.
  • the substantially vertical well bore is lined with a suitable well casing 16 that terminates at or above the level of the coal seam 15.
  • the substantially vertical well bore 12 is logged either during or after drilling in order to locate the exact vertical depth of the coal seam 15. As a result, the coal seam is not missed in subsequent drilling operations and techniques used to locate the seam 15 while drilling need not be employed.
  • An enlarged diameter cavity 20 is formed in the substantially vertical well bore 12 at the level of the coal seam 15. As described in more detail below, the enlarged diameter cavity 20 provides a junction for intersection of the substantially vertical well bore by articulated well bore used to form a substantially horizontal drainage pattern in the coal seam 15. The enlarged diameter cavity 20 also provides a collection point for fluids drained from the coal seam 15 during production operations .
  • the enlarged diameter cavity 20 has a radius of approximately eight feet and a vertical dimension which equals or exceeds the vertical dimension of the coal seam 15.
  • the enlarged diameter cavity 20 is formed using suitable under-reaming techniques and equipment.
  • a vertical portion of the substantially vertical well bore 12 continues below the enlarged diameter cavity 20 to form a sump 22 for the cavity 20.
  • An articulated well bore 30 extends from the surface 14 to the enlarged diameter cavity 20 of the substantially vertical well bore 12.
  • the articulated well bore 30 includes a substantially vertical portion 32, a substantially horizontal portion 34, and a curved or radiused portion 36 interconnecting the vertical and horizontal portions 32 and 34.
  • the horizontal portion 34 lies substantially in the horizontal plane of the coal seam 15 and intersects the large diameter cavity 20 of the substantially vertical well bore 12.
  • the articulated well bore 30 is offset a sufficient distance from the substantially vertical well bore 12 at the surface 14 to permit the large radius curved section 36 and any desired horizontal section 34 to be drilled before intersecting the enlarged diameter cavity 20.
  • the articulated well bore 30 is offset a distance of about 300 feet from the substantially vertical well bore 12. This spacing minimizes the angle of the curved portion 36 to reduce friction in the bore 30 during drilling operations. As a result, reach of the articulated drill string drilled through the articulated well bore 30 is maximized.
  • the articulated well bore 30 is drilled using articulated drill string 40 that includes a suitable down- hole motor and bit 42.
  • a measurement while drilling (MWD) device 44 is included in the articulated drill string 40 for controlling the orientation and direction of the well bore drilled by the motor and bit 42.
  • the substantially vertical portion 32 of the articulated well bore 30 is lined with a suitable casing 38.
  • the substantially horizontal drainage pattern 50 and other such well bores include sloped, undulating, or other inclinations of the coal seam 15 or other subterranean zone.
  • gamma ray logging tools and conventional measurement while drilling devices may be employed to control and direct the orientation of the drill bit to retain the drainage pattern 50 within the confines of the coal seam 15 and to provide substantially uniform coverage of a desired area within the coal seam 15. Further information regarding the drainage pattern is described in more detail below in connection with FIGURES 4-7.
  • drilling fluid or "mud” is pumped down the articulated drill string 40 and circulated out of the drill string 40 in the vicinity of the bit 42, where it is used to scour the formation and to remove formation cuttings .
  • the cuttings are then entrained in the drilling fluid which circulates up through the annulus between the drill string 40 and the well bore walls until it reaches the surface 14, where the cuttings are removed from the drilling fluid and the fluid is then recirculated.
  • This conventional drilling operation produces a standard column of drilling fluid having a vertical height equal to the depth of the well bore 30 and produces a hydrostatic pressure on the well bore corresponding to the well bore depth.
  • coal seams tend to be porous and fractured, they may be unable to sustain such hydrostatic pressure, even if formation water is also present in the coal seam 15. Accordingly, if the full hydrostatic pressure is allowed to act on the coal seam 15, the result may be loss of drilling fluid and entrained cuttings into the formation. Such a circumstance is referred to as an "over balanced" drilling operation in which the hydrostatic fluid pressure in the well bore exceeds the ability of the formation to withstand the pressure. Loss of drilling fluids in cuttings into the formation not only is expensive in terms of the lost drilling fluids, which must be made up, but it tends to plug the pores in the coal seam 15, which are needed to drain the coal seam of gas and water.
  • air compressors 60 are provided to circulate compressed air down the substantially vertical well bore 12 and back up through the articulated well bore 30.
  • the circulated air will admix with the drilling fluids in the annulus around the articulated drill string 40 and create bubbles throughout the column of drilling fluid. This has the effective of lightening the hydrostatic pressure of the drilling fluid and reducing the down-hole pressure sufficiently that drilling conditions do not become over balanced. Aeration of the drilling fluid reduces down-hole pressure to approximately 150-200 pounds per square inch (psi) .
  • low pressure coal seams and other subterranean zones can be drilling without substantial loss of drilling fluid and contamination of the zone by the drilling fluid.
  • Foam which may be compressed air mixed with water, may also be circulated down through the articulated drill string 40 along with the drilling mud in order to aerate the drilling fluid in the annulus as the articulated well bore 30 is being drilled and, if desired, as the drainage pattern 50 is being drilled. Drilling of the drainage pattern 50 with the use of an air hammer bit or an air- powered down-hole motor will also supply compressed air or foam to the drilling fluid. In this case, the compressed air or foam which is used to power the bit or down-hole motor exits the vicinity of the drill bit 42. However, the larger volume of air which can be circulated down the substantially vertical well bore 12, permits greater aeration of the drilling fluid than generally is possible by air supplied through the articulated drill string 40.
  • FIGURE 2 illustrates method and system for drilling the drainage pattern 50 in the coal seam 15 in accordance with another embodiment of the present invention.
  • the substantially vertical well bore 12, enlarged diameter cavity 20 and articulated well bore 32 are positioned and formed as previously described in connection with the FIGURE 1.
  • a pump 52 is installed in the enlarged diameter cavity 20 to pump drilling fluid and cuttings to the surface 14 through the substantially vertical well bore 12. This eliminates the friction of air and fluid returning up the articulated well bore 30 and reduces down-hole pressure to nearly zero. Accordingly, coal seams and other subterranean zones having ultra low pressures below 150 psi can be accessed from the surface. Additionally, the risk of combining air and methane in the well is eliminated.
  • FIGURE 3 illustrates production of fluids from the horizontal drainage pattern 50 in the coal seam 15 in accordance with one embodiment of the present invention.
  • the articulated drill string 40 is removed from the articulated well bore 30 and the articulated well bore is capped.
  • the articulated well 30 may be plugged in the substantially horizontal portion 34. Otherwise, the articulated well 30 may be left unplugged.
  • a down hole pump 80 is disposed in the substantially vertical well bore 12 in the enlarged diameter cavity 22.
  • the enlarged cavity 20 provides a reservoir for accumulated fluids allowing intermittent pumping without adverse effects of a hydrostatic head caused by accumulated fluids in the well bore.
  • the down hole pump 140 is connected to the surface 14 via a tubing string 82 and may be powered by sucker rods 84 extending down through the well bore 12 of the tubing.
  • the sucker rods 84 are reciprocated by a suitable surface mounted apparatus, such as a powered walking beam 86 to operate the down hole pump 80.
  • the down hole pump 80 is used to remove water and entrained coal fines from the coal seam 15 via the drainage pattern 50. Once the water is removed to the surface, it may be treated for separation of methane which may be dissolved in the water and for removal of entrained fines .
  • pure coal seam gas may be allowed to flow to the surface 14 through the annulus of the substantially vertical well bore 12 around the tubing string 82 and removed via piping attached to a wellhead apparatus.
  • the methane is treated, compressed and pumped through a pipeline for use as a fuel in a conventional manner.
  • the down hole pump 80 may be operated continuously or as needed to remove water drained from the coal seam 15 into the enlarged diameter cavity 22.
  • FIGURES 4-7 illustrate substantially horizontal drainage patterns 50 for accessing the coal seam 15 or other subterranean zone in accordance with one embodiment of the present invention.
  • the drainage patterns comprise pinnate patterns that have a central diagonal with generally symmetrically arranged and appropriately spaced laterals extending from each side of the diagonal.
  • the pinnate pattern approximates the pattern of veins in a leaf or the design of a feather in that it has similar, substantially parallel, auxiliary drainage bores arranged in substantially equal and parallel spacing or opposite sides of an axis.
  • the pinnate drainage pattern with its central bore and generally symmetrically arranged and appropriately spaced auxiliary drainage bores on each side provides a uniform pattern for draining fluids from a coal seam or other subterranean formation.
  • the pinnate pattern provides substantially uniform coverage of a square, other quadrilateral, or grid area and may be aligned with longwall mining panels for preparing the coal seam 15 for mining operations. It will be understood that other suitable drainage patterns may be used in accordance with the present invention.
  • the pinnate and other suitable drainage patterns drilled from the surface provide surface access to subterranean formations .
  • the drainage pattern may be used to uniformly remove and/or insert fluids or otherwise manipulate a subterranean deposit.
  • the drainage pattern may be used initiating in-situ burns, "huff-puff" steam operations for heavy crude oil, and the removal of hydrocarbons from low porosity reservoirs .
  • FIGURE 4 illustrates a pinnate drainage pattern 100 in accordance with one embodiment of the present invention.
  • the pinnate drainage pattern 100 provides access to a substantially square area 102 of a subterranean zone.
  • a number of the pinnate patterns 60 may be used together to provide uniform access to a large subterranean region.
  • the enlarged diameter cavity 20 defines a first corner of the area 102.
  • the pinnate pattern 100 includes a substantially horizontal main well bore 104 extending diagonally across the area 102 to a distant corner 106 of the area 102.
  • the substantially vertical and articulated well bores 12 and 30 are positioned over the area 102 such that the diagonal bore 104 is drilled up the slope of the coal seam 15. This will facilitate collection of water, gas from the area 102.
  • the diagonal bore 104 is drilled using the articulated drill string 40 and extends from the enlarged cavity 20 in alignment with the articulated well bore 30.
  • a plurality of lateral well bores 110 extend from the opposites sides of diagonal bore 104 to a periphery 112 of the area 102.
  • the lateral bores 122 may mirror each other on opposite sides of the diagonal bore 104 or may be offset from each other along the diagonal bore 104.
  • Each of the lateral bores 110 includes a radius curving portion 114 coming off of the diagonal bore 104 and an elongated portion 116 formed after the curved portion 114 has reached a desired orientation.
  • pairs of lateral bores 110 are substantially evenly spaced on each side of the diagonal bore 104 and extend from the diagonal 64 at an angle of approximately 45 degrees.
  • the lateral bores 110 shorten in length based on progression away from the enlarged diameter cavity 20 in order to facilitate drilling of the lateral bores 110.
  • the pinnate drainage pattern 100 using a single diagonal bore 104 and five pairs of lateral bores 110 may drain a coal seam area of approximately 150 acres in size. Where a smaller area is to be drained, or where the coal seam has a different shape, such as a long, narrow shape or due to surface or subterranean topography, alternate pinnate drainage patterns may be employed by varying the angle of the lateral bores 110 to the diagonal bore 104 and the orientation of the lateral bores 110. Alternatively, lateral bores 120 can be drilled from only one side of the diagonal bore 104 to form a one-half pinnate pattern. The diagonal bore 104 and the lateral bores 110 are formed by drilling through the enlarged diameter cavity 20 using the articulated drill string 40 and appropriate horizontal drilling apparatus.
  • gamma ray logging tools and conventional measurement while drilling technologies may be employed to control the direction and orientation of the drill bit so as to retain the drainage pattern within the confines of the coal seam 15 and to maintain proper spacing and orientation of the diagonal and lateral bores 104 and 110.
  • the diagonal bore 104 is drilled with an incline at each of a plurality of lateral kick-off points 108. After the diagonal 104 is complete, the articulated drill string 40 is backed up to each successive lateral point 108 from which a lateral bore 110 is drilled on each side of the diagonal 104.
  • the pinnate drainage pattern 100 may be otherwise suitably formed in accordance with the present invention .
  • FIGURE 5 illustrates a pinnate drainage pattern 120 in accordance with another embodiment of the present invention. In this embodiment, the pinnate drainage pattern 120 drains a substantially rectangular area 122 of the coal seam 15.
  • the pinnate drainage pattern 120 includes a main diagonal bore 124 and a plurality of lateral bores 126 that are formed as described in connection with diagonal and lateral bores 104 and 110 of FIGURE 4.
  • the lateral bores 126 on a first side of the diagonal 124 include a shallow angle while the lateral bores 126 on the opposite side of the diagonal 124 include a steeper angle to together provide uniform coverage of the area 12.
  • FIGURE 6 illustrates a quadrilateral pinnate drainage pattern 140 in accordance with another embodiment of the present invention.
  • the quadrilateral drainage pattern 140 includes four discrete pinnate drainage patterns 100 each draining a quadrant of a region 142 covered by the pinnate drainage pattern 140.
  • Each of the pinnate drainage patterns 100 includes a diagonal well bore 104 and a plurality of lateral well bores 110 extending from the diagonal well bore 104.
  • each of the diagonal and lateral bores 104 and 110 are drilled from a common articulated well bore 141. This allows tighter spacing of the surface production equipment, wider coverage of a drainage pattern and reduces drilling equipment and operations.
  • FIGURE 7 illustrates the alignment of pinnate drainage patterns 100 with subterranean structures of a coal seam for degasifying and preparing the coal seam for mining operations in accordance with one embodiment of the present invention.
  • the coal seam 15 is mined using a longwall process. It will be understood that the present invention can be used to degassify coal seams for other types of mining operations.
  • coal panels 150 extend longitudinally from a longwall 152.
  • each panel 150 is subsequently mined from a distant end toward the longwall 152 and the mine roof allowed to cave and fracture into the opening behind the mining process.
  • the pinnate drainage patterns 100 Prior to mining of the panels 150, the pinnate drainage patterns 100 are drilled into the panels 150 from the surface to degasify the panels 150 well ahead of mining operations .
  • Each of the pinnate drainage patterns 100 is aligned with the longwall 152 and panel 150 grid and covers portions of one or more panels 150. In this way, a region of a mine can be degasified from the surface based on subterranean structures and constraints.
  • FIGURE 8 is a flow diagram illustrating a method for preparing the coal seam 15 for mining operations in accordance with one embodiment of the present invention.
  • the method begins at step 160 in which areas to be drained and drainage patterns 50 for the areas are identified.
  • the areas are aligned with the grid of a mining plan for the region.
  • Pinnate structures 100, 120 and 140 may be used to provide optimized coverage for the region. It will be understood that other suitable patterns may be used to degasify the coal seam 15.
  • the substantially vertical well 12 is drilled from the surface 14 through the coal seam 15.
  • down hole logging equipment is utilized to exactly identify the location of the coal seam in the substantially well bore 12.
  • the enlarged diameter cavity 22 is formed in the substantially vertical well bore 12 at the location of the coal seam 15.
  • the enlarged diameter cavity 20 may be formed by under reaming and other conventional techniques .
  • the articulated well bore 30 is drilled to intersect the enlarged diameter cavity 22.
  • the main diagonal bore 104 for the pinnate drainage pattern 100 is drilled through the articulated well bore 30 into the coal seam 15.
  • lateral bores 110 for the pinnate drainage pattern 100 are drilled at step 170.
  • lateral kick-off points may be formed in the diagonal bore 104 during its formation to facilitate drilling of the lateral bores 110.
  • the articulated well bore 30 is capped.
  • the enlarged diagonal cavity 22 is cleaned in preparation for installation of downhole production equipment. The enlarged diameter cavity 22 may be cleaned by pumping compressed air down the substantially vertical well bore 12 or other suitable techniques .
  • production equipment is installed in the substantially vertical well bore 12.
  • the production equipment includes a sucker rod pump extending down into the cavity 22 for removing water from the coal seam 15. The removal of water will drop the pressure of the coal seam and allow methane gas to diffuse and be produced up the annulus of the substantially vertical well bore 12.
  • step 178 water that drains from the drainage pattern 100 into the cavity 22 is pumped to the surface with the rod pumping unit. Water may be continuously or intermittently be pumped as needed to remove it from the cavity 22.
  • step 180 methane gas diffused from the coal seam 15 is continuously collected at the surface 14.
  • decisional step 182 it is determined whether the production of gas from the coal seam 15 is complete. In one embodiment, the production of gas may be complete after the cost of the collecting the gas exceeds the revenue generated by the well. In another embodiment, gas may continue to be produced from the well until a remaining level of gas in the coal seam 15 is below required levels for mining operations.
  • step 182 If production of the gas is not complete, the No branch of decisional step 182 returns to steps 178 and 180 in which water and gas continue to be removed from the coal seam 15. Upon completion of production, the Yes branch of decisional step 182 leads to step 184 in which the production equipment is removed.
  • decisional step 186 it is determined whether the coal seam 15 is to be further prepared for mining operations. If the coal seam 15 is to be further prepared for mining operations, the Yes branch of decisional step 186 leads to step 188 m which water and other additives may be injected back into the coal seam 15 to rehydrate the coal seam in order to minimize dust, to improve the efficiency of mining, and to improve the mined product.
  • Step 188 and the No branch of decisional step 186 lead to step 190 m which the coal seam 15 is mined.
  • the removal of the coal from the seam causes the mined roof to cave and fracture into the opening behind the mining process.
  • the collapsed roof creates gob gas which may be collected at step 192 through the substantially vertical well bore 12. Accordingly, additional drilling operations are not required to recover gob gas from a mined coal seam.
  • Step 192 leads to the end of the process by which a coal seam is efficiently degasified from the surface.
  • the method provides a symbiotic relationship with the mine to remove unwanted gas prior to mining and to rehydrate the coal prior to the mining process.
  • FIGURES 9A through 9C are diagrams illustrating deployment of a well cavity pump 200 in accordance with an embodiment of the present invention.
  • well cavity pump 200 comprises a well bore portion 202 and a cavity positioning device 204.
  • Well bore portion 202 comprises an inlet 206 for drawing and transferring well fluid contained within cavity 20 to a surface of vertical well bore 12.
  • cavity positioning device 204 is rotatably coupled to well bore portion 202 to provide rotational movement of cavity positioning device 204 relative to well bore portion 202.
  • a pin, shaft, or other suitable method or device may be used to rotatably couple cavity position device 204 to well bore portion 202 to provide pivotal movement of cavity positioning device 204 about an axis 208 relative to well bore portion 202.
  • cavity positioning device 204 may be coupled to well bore portion 202 between an end 210 and an end 212 of cavity positioning device 204 such that both ends 210 and 212 may be rotatably manipulated relative to well bore portion 202.
  • Cavity positioning device 204 also comprises a counter balance portion 214 to control a position of ends 210 and 212 relative to well bore portion 202 in a generally unsupported condition.
  • cavity positioning device 204 is generally cantilevered about axis 208 relative to well bore portion 202.
  • Counter balance portion 214 is disposed along cavity positioning device 204 between axis 208 and end 210 such that a weight or mass of counter balance portion 214 counter balances cavity positioning device 204 during deployment and withdrawal of well cavity pump 200 relative to vertical well bore 12 and cavity 20.
  • cavity positioning device 204 is deployed into vertical well bore 12 having end 210 and counter balance portion 214 positioned in a generally retracted condition, thereby disposing end 210 and counter balance portion 214 adjacent well bore portion 202.
  • a length of cavity positioning device 204 generally prevents rotational movement of cavity positioning device 204 relative to well bore portion 202.
  • the mass of counter balance portion 214 may cause counter balance portion 214 and end 212 to be generally supported by contact with a vertical wall 218 of vertical well bore 12 as well cavity pump 200 travels downwardly within vertical well bore 12.
  • counter balance portion 214 causes rotational or pivotal movement of cavity positioning device 204 relative to well bore portion 202 as cavity positioning device 204 transitions from vertical well bore 12 to cavity 20.
  • counter balance portion 214 and end 212 become generally unsupported by vertical wall 218 of vertical well bore 12.
  • counter balance portion 214 automatically causes rotational movement of cavity positioning device 204 relative to well bore portion 202.
  • counter balance portion 214 generally causes end 210 to rotate or extend outwardly relative to vertical well bore 12 in the direction indicated generally by arrow 220.
  • end 212 of cavity positioning device 204 extends or rotates outwardly relative to vertical well bore 12 in the direction indicated generally by arrow 222.
  • the length of cavity positioning device 204 is configured such that ends 210 and 212 of cavity positioning device 204 become generally unsupported by vertical well bore 12 as cavity positioning device 204 transitions from vertical well bore 12 into cavity 20, thereby allowing counter balance portion 214 to cause rotational movement of end 212 outwardly relative to well bore portion 202 and beyond an annulus portion 224 of sump 22.
  • counter balance portion 214 causes end 212 to rotate or extend outwardly in the direction indicated generally by arrow 222 such that continued downward travel of well cavity pump 200 results in contact of end 12 with a horizontal wall 226 of cavity 20.
  • inlet 206 may be located at various positions along well bore portion 202 such that inlet 206 is disposed at the predefined location within cavity 20 as cavity positioning device 204 bottoms out within cavity 20. Therefore, inlet 206 may be accurately positioned within cavity 20 to substantially prevent drawing in debris or other material disposed within sump or rat hole 22 and to prevent gas interference caused by placement of the inlet 20 in the narrow well bore. Additionally, inlet 206 may be positioned within cavity 20 to maximize fluid withdrawal from cavity 20.
  • upward travel of well cavity pump 200 generally results in releasing contact between counter balance portion 214 and end 212 with horizontal walls 230 and 226, respectively.
  • the mass of cavity positioning device 204 disposed between end 212 and axis 208 generally causes cavity positioning device 204 to rotate in directions opposite the directions indicated generally by arrows 220 and 222 as illustrated FIGURE 9B.
  • counter balance portion 214 cooperates with the mass of cavity positioning device 204 disposed between end 212 and axis 208 to generally align cavity positioning device 204 with vertical well bore 12.
  • cavity positioning device 204 automatically becomes aligned with vertical well bore 12 as well cavity pump 200 is withdrawn from cavity 20. Additional upward travel of well cavity pump 200 then may be used to remove cavity positioning device 204 from cavity 20 and vertical well bore 12.
  • the present invention provides greater reliability than prior systems and methods by positively locating inlet 206 of well cavity pump 200 at a predefined location within cavity 20. Additionally, well cavity pump 200 may be efficiently removed from cavity 20 without requiring additional unlocking or alignment tools to facilitate the withdrawal of well cavity pump 200 from cavity 20 and vertical well bore 12.

Abstract

Improved method and system for accessing subterranean deposits from the surface that substantially eliminates or reduces the disadvantages and problems associated with previous systems and methods. In particular, the present invention provides an articulated well with a drainage pattern that intersects a horizontal cavity well. The drainage patterns provide access to a large subterranean area from the surface while the vertical cavity well allows entrained water, hydrocarbons, and other deposits to be efficiently removed and/or produced.

Description

METHOD AND SYSTEM FOR ACCESSING SUBTERRANEAN DEPOSITS FROM THE SURFACE
TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to the recovery of subterranean deposits, and more particularly to a method and system for accessing subterranean deposits from the surface.
BACKGROUND OF THE INVENTION
Subterranean deposits of coal contain substantial quantities of entrained methane gas limited in production in use of methane gas from coal deposits has occurred for many years. Substantial obstacles, however, have frustrated more extensive development and use of methane gas deposits in coal seams . The foremost problem in producing methane gas from coal seams is that while coal seams may extend over large areas of up to several thousand acres, the coal seams are fairly, shallow in depth, varying from a few inches to several meters. Thus, while the coal v seams are often relatively near the surface, vertical wells drilled into the coal deposits for obtaining methane gas can only drain a fairly small radius around the coal deposits. Further, coal deposits- are not amendable to pressure fracturing and other methods often used for increasing methane gas production from rock formations. As a result, once the gas easily drained from a vertical well bore in a coal seam is produced, further production is limited in volume. Additionally, coal seams are often associated with subterranean water, which must be drained from the coal seam in order to produce the methane.
Horizontal drilling patterns have been tried in order to extend the amount of coal seams exposed to a drill bore for gas extraction. Such horizontal drilling techniques, however, require the use of a radiused well bore which presents difficulties in removing the entrained water from the coal seam. The most efficient method for pumping water from a subterranean well, a sucker rod pump, does not work well in horizontal or radiused bores.
A further problem for surface production of gas from coal seams is the difficulty presented by under balanced drilling conditions caused by the porousness of the coal seam. During both vertical and horizontal surface drilling operations, drilling fluid is used to remove cuttings from the well bore to the surface. The drilling fluid exerts a hydrostatic pressure on the formation which, if it exceeds the hydrostatic pressure of the formation, can result in a loss of drilling fluid into the formation. This results in entrainment of drilling finds in the formation, which tends to plug the pores, cracks, and fractures that are needed to produce the gas .
As a result of these difficulties in surface production of methane gas from coal deposits, the methane gas which must be removed from a coal seam prior to mining, has been removed from coal seams through the use of subterranean methods . While the use of subterranean methods allows water to be easily removed from a coal seam and eliminates under balanced drilling conditions, they can only access a limited amount of the coal seams exposed by current mining operations. Where longwall mining is practiced, for example, underground drilling rigs are used to drill horizontal holes from a panel currently being mined into an adjacent panel that will later be mined. The limitations of underground rigs limits the reach of such horizontal holes and thus the area that can be effectively drained. In addition, the degasification of a next panel during mining of a current panel limits the time for degasification . As a result, many horizontal bores must be drilled to remove the gas in a limited period of time. Furthermore, m conditions of high gas content or migration of gas through a coal seam, mining may need to be halted or delayed until a next panel can be adequately degasified. These production delays add to the expense associated with degasifymg a coal seam.
SUMMARY OF THE INVENTION The present invention provides an improved method and system for accessing subterranean deposits from the surface that substantially eliminates or reduces the disadvantages and problems associated with previous systems and methods. In particular, the present invention provides an articulated well with a drainage pattern that intersects a horizontal cavity well. The drainage patterns provide access to a large subterranean area from the surface while the vertical cavity well allows entrained water, hydrocarbons, and other deposits to be efficiently removed and/or produced.
In accordance with one embodiment of the present invention, a method for accessing a subterranean zone from the surface includes drilling a substantially vertical well bore from the surface to the subterranean zone. An articulated well bore is drilled from the surface to the subterranean zone. The articulated well bore is horizontally offset from the substantially vertical well bore at the surface and intersects the substantially vertical well bore at a junction proximate to the subterranean zone. A substantially horizontal drainage pattern is drilled through the articulated well bore from the junction into the subterranean zone. In accordance with another aspect of the present invention, the substantially horizontal drainage pattern may comprise a pinnate pattern including a substantially horizontal diagonal well bore extending from the substantially vertical well bore that defines a first end of an area covered by the drainage pattern to a distant end of the area. A first of substantially horizontal lateral well bores extend in space relation to each other from the diagonal well bore to the periphery of the area on a first side of the diagonal well bore. A second set of substantially horizontal lateral well bores extend in space relation to each other from the diagonal well bore to the periphery of the area on a second, opposite side of the diagonal .
In accordance with still another aspect of the present invention, a method for preparing a subterranean zone for mining uses the substantially vertical and articulated well bores and the drainage pattern. Water is drained from the subterranean zone through the drainage pattern to the junction of the substantially vertical well bore. Water is pumped from the junction to the surface through the substantially vertical well bore. Gas is produced from the subterranean zone through at least one of the substantially vertical and articulated well bores. After degasification has been completed, the subterranean zone may be further prepared by pumping water and other additives into the zone through the drainage pattern.
In accordance with yet another aspect of the present invention, a pump positioning device is provided to accurately position a downhole pump in a cavity of a well bore .
Technical advantages of the present invention include providing an improved method and system for accessing subterranean deposits from the surface. In particular, a horizontal drainage pattern is drilled in a target zone from an articulated surface well to provide access to the zone from the surface. The drainage pattern intersected by a vertical cavity well from which entrained water, hydrocarbons, and other fluids drained from the zone can be efficiently removed and/or produced by a rod pumping unit. As a result, gas, oil, and other fluids can be efficiently produced at the surface from a low pressure or low porosity formation . Another technical advantage of the present invention includes providing an improved method and system for drilling into low-pressure reservoirs. In particular, a downhole pump or gas lift is used to lighten hydrostatic pressure exerted by drilling fluids used to remove cuttings during drilling operations. As a result, reservoirs may be drilled at ultra-low pressures without loss of drilling fluids into the formation and plugging of the formation.
Yet another technical advantage of the present invention includes providing an improved horizontal drainage pattern for accessing a subterranean zone. In particular, a pinnate structure with a main diagonal and opposed laterals is used to maximize access to a subterranean zone from a single vertical well bore. Length of the laterals is maximized proximate to the vertical well bore and decreased toward the end of the main diagonal to provide uniform access to a quadrilateral or other grid area. This allows the drainage pattern to be aligned with longwall panels and other subsurface structures for degasification of a mine coal seam or other deposit.
Still another technical advantage of the present invention includes providing an improved method and system for preparing a coal seam or other subterranean deposit for mining. In particular, surface wells are used to degasify a coal seam ahead of mining operations. This reduces underground equipment and activities and increases the time provided to degasify the seam which minimizes shutdowns due to high gas content. In addition, water and additives may be pumped into the degasified coal seam prior to mining operations to minimize dust and other hazardous conditions, to improve efficiency of the mining process, and to improve the quality of the coal product. Still another technical advantage of the present invention includes providing an improved method and system for producing methane gas from a mined coal seam. In particular, well bores used to initially degasify a coal seam prior to mining operations may be reused to collect gob gas from the seam after mining operation. As a result, costs associated with the collection of gob gas are minimized to facilitate or make feasible the collection of gob gas from previously mined seams .
Still another technical advantage of the present invention includes providing a positioning device for automatically positioning down-hole pumps and other equipment in a cavity. In particular, a rotatable cavity positioning device is configured to retract for transport in a well bore and to extend within a down-hole cavity to optimally position the equipment within the cavity. This allows down-hole equipment to be easily positioned and secured within the cavity. Other technical advantages of the present invention will be readily apparent to one skilled in the art from the following figures, description, and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the present invention and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like numerals represent like parts, in which:
FIGURE 1 is a cross-sectional diagram illustrating formation of a horizontal drainage pattern in a subterranean zone through an articulated surface well intersecting a vertical cavity well in accordance with one embodiment of the present invention;
FIGURE 2 is a cross-sectional diagram illustrating formation of the horizontal drainage pattern in the subterranean zone through the articulated surface well intersecting the vertical cavity well in accordance with another embodiment of the present invention;
FIGURE 3 is a cross-sectional diagram illustrating production of fluids from a horizontal draining pattern in a subterranean zone through a vertical well bore in accordance with one embodiment of the present invention; FIGURE 4 is a top plan diagram illustrating a pinnate drainage pattern for accessing deposits in a subterranean zone in accordance with one embodiment of the' present invention;
FIGURE 5 is a top plan diagram illustrating a pinnate drainage pattern for accessing deposits in a subterranean zone in accordance with another embodiment of the present invention; FIGURE 6 is a top plan diagram illustrating a quadrilateral pinnate drainage pattern for accessing deposits in a subterranean zone in accordance with still another embodiment of the present invention; FIGURE 7 is a top plan diagram illustrating the alignment of pinnate drainage patterns within panels of a coal seam for degasifying and preparing the coal seam for mining operations in accordance with one embodiment of the present invention; FIGURE 8 is a flow diagram illustrating a method for preparing a coal seam for mining operations in accordance with one embodiment of the present invention;
FIGURES 9A-C are cross-sectional diagrams illustrating a cavity well positioning tool in accordance with one embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
FIGURE 1 illustrates a cavity and articulated well combination for accessing a subterranean zone from the surface in accordance with one embodiment of the present invention. In this embodiment, the subterranean zone is a coal seam. It will be understood that other low pressure, ultra-low pressure, and low porosity subterranean zones can be similarly accessed using the dual well system of the present invention to remove and/or produce water, hydrocarbons and other fluids in the zone and to treat minerals in the zone prior to mining operations .
Referring to FIGURE 1, a substantially vertical well bore 12 extends from the surface 14 to a target coal seam 15. The substantially vertical well bore 12 intersects, penetrates and continues below the coal seam 15. The substantially vertical well bore is lined with a suitable well casing 16 that terminates at or above the level of the coal seam 15.
The substantially vertical well bore 12 is logged either during or after drilling in order to locate the exact vertical depth of the coal seam 15. As a result, the coal seam is not missed in subsequent drilling operations and techniques used to locate the seam 15 while drilling need not be employed. An enlarged diameter cavity 20 is formed in the substantially vertical well bore 12 at the level of the coal seam 15. As described in more detail below, the enlarged diameter cavity 20 provides a junction for intersection of the substantially vertical well bore by articulated well bore used to form a substantially horizontal drainage pattern in the coal seam 15. The enlarged diameter cavity 20 also provides a collection point for fluids drained from the coal seam 15 during production operations .
In one embodiment, the enlarged diameter cavity 20 has a radius of approximately eight feet and a vertical dimension which equals or exceeds the vertical dimension of the coal seam 15. The enlarged diameter cavity 20 is formed using suitable under-reaming techniques and equipment. A vertical portion of the substantially vertical well bore 12 continues below the enlarged diameter cavity 20 to form a sump 22 for the cavity 20.
An articulated well bore 30 extends from the surface 14 to the enlarged diameter cavity 20 of the substantially vertical well bore 12. The articulated well bore 30 includes a substantially vertical portion 32, a substantially horizontal portion 34, and a curved or radiused portion 36 interconnecting the vertical and horizontal portions 32 and 34. The horizontal portion 34 lies substantially in the horizontal plane of the coal seam 15 and intersects the large diameter cavity 20 of the substantially vertical well bore 12.
The articulated well bore 30 is offset a sufficient distance from the substantially vertical well bore 12 at the surface 14 to permit the large radius curved section 36 and any desired horizontal section 34 to be drilled before intersecting the enlarged diameter cavity 20. To provide the curved portion 36 with a radius of 100-150 feet, the articulated well bore 30 is offset a distance of about 300 feet from the substantially vertical well bore 12. This spacing minimizes the angle of the curved portion 36 to reduce friction in the bore 30 during drilling operations. As a result, reach of the articulated drill string drilled through the articulated well bore 30 is maximized. The articulated well bore 30 is drilled using articulated drill string 40 that includes a suitable down- hole motor and bit 42. A measurement while drilling (MWD) device 44 is included in the articulated drill string 40 for controlling the orientation and direction of the well bore drilled by the motor and bit 42. The substantially vertical portion 32 of the articulated well bore 30 is lined with a suitable casing 38.
After the enlarged diameter cavity 20 has been successfully intersected by the articulated well bore 30, drilling is continued through the cavity 20 using the articulated drill string 40 and appropriate horizontal drilling apparatus to provide a substantially horizontal drainage pattern 50 in the coal seam 15. The substantially horizontal drainage pattern 50 and other such well bores include sloped, undulating, or other inclinations of the coal seam 15 or other subterranean zone. During this operation, gamma ray logging tools and conventional measurement while drilling devices may be employed to control and direct the orientation of the drill bit to retain the drainage pattern 50 within the confines of the coal seam 15 and to provide substantially uniform coverage of a desired area within the coal seam 15. Further information regarding the drainage pattern is described in more detail below in connection with FIGURES 4-7.
During the process of drilling the drainage pattern 50, drilling fluid or "mud" is pumped down the articulated drill string 40 and circulated out of the drill string 40 in the vicinity of the bit 42, where it is used to scour the formation and to remove formation cuttings . The cuttings are then entrained in the drilling fluid which circulates up through the annulus between the drill string 40 and the well bore walls until it reaches the surface 14, where the cuttings are removed from the drilling fluid and the fluid is then recirculated. This conventional drilling operation produces a standard column of drilling fluid having a vertical height equal to the depth of the well bore 30 and produces a hydrostatic pressure on the well bore corresponding to the well bore depth. Because coal seams tend to be porous and fractured, they may be unable to sustain such hydrostatic pressure, even if formation water is also present in the coal seam 15. Accordingly, if the full hydrostatic pressure is allowed to act on the coal seam 15, the result may be loss of drilling fluid and entrained cuttings into the formation. Such a circumstance is referred to as an "over balanced" drilling operation in which the hydrostatic fluid pressure in the well bore exceeds the ability of the formation to withstand the pressure. Loss of drilling fluids in cuttings into the formation not only is expensive in terms of the lost drilling fluids, which must be made up, but it tends to plug the pores in the coal seam 15, which are needed to drain the coal seam of gas and water.
To prevent over balance drilling conditions during formation of the drainage pattern 50, air compressors 60 are provided to circulate compressed air down the substantially vertical well bore 12 and back up through the articulated well bore 30. The circulated air will admix with the drilling fluids in the annulus around the articulated drill string 40 and create bubbles throughout the column of drilling fluid. This has the effective of lightening the hydrostatic pressure of the drilling fluid and reducing the down-hole pressure sufficiently that drilling conditions do not become over balanced. Aeration of the drilling fluid reduces down-hole pressure to approximately 150-200 pounds per square inch (psi) .
Accordingly, low pressure coal seams and other subterranean zones can be drilling without substantial loss of drilling fluid and contamination of the zone by the drilling fluid.
Foam, which may be compressed air mixed with water, may also be circulated down through the articulated drill string 40 along with the drilling mud in order to aerate the drilling fluid in the annulus as the articulated well bore 30 is being drilled and, if desired, as the drainage pattern 50 is being drilled. Drilling of the drainage pattern 50 with the use of an air hammer bit or an air- powered down-hole motor will also supply compressed air or foam to the drilling fluid. In this case, the compressed air or foam which is used to power the bit or down-hole motor exits the vicinity of the drill bit 42. However, the larger volume of air which can be circulated down the substantially vertical well bore 12, permits greater aeration of the drilling fluid than generally is possible by air supplied through the articulated drill string 40. FIGURE 2 illustrates method and system for drilling the drainage pattern 50 in the coal seam 15 in accordance with another embodiment of the present invention. In this embodiment, the substantially vertical well bore 12, enlarged diameter cavity 20 and articulated well bore 32 are positioned and formed as previously described in connection with the FIGURE 1.
Referring to FIGURE 2, after intersection of the enlarged diameter cavity 20 by the articulated well bore 30 a pump 52 is installed in the enlarged diameter cavity 20 to pump drilling fluid and cuttings to the surface 14 through the substantially vertical well bore 12. This eliminates the friction of air and fluid returning up the articulated well bore 30 and reduces down-hole pressure to nearly zero. Accordingly, coal seams and other subterranean zones having ultra low pressures below 150 psi can be accessed from the surface. Additionally, the risk of combining air and methane in the well is eliminated.
FIGURE 3 illustrates production of fluids from the horizontal drainage pattern 50 in the coal seam 15 in accordance with one embodiment of the present invention. In this embodiment, after the substantially vertical and articulated well bores 12 and 30 as well as desired drainage pattern 50 have been drilled, the articulated drill string 40 is removed from the articulated well bore 30 and the articulated well bore is capped. For multiple pinnate structure described below, the articulated well 30 may be plugged in the substantially horizontal portion 34. Otherwise, the articulated well 30 may be left unplugged. Referring to FIGURE 3, a down hole pump 80 is disposed in the substantially vertical well bore 12 in the enlarged diameter cavity 22. The enlarged cavity 20 provides a reservoir for accumulated fluids allowing intermittent pumping without adverse effects of a hydrostatic head caused by accumulated fluids in the well bore.
The down hole pump 140 is connected to the surface 14 via a tubing string 82 and may be powered by sucker rods 84 extending down through the well bore 12 of the tubing. The sucker rods 84 are reciprocated by a suitable surface mounted apparatus, such as a powered walking beam 86 to operate the down hole pump 80. The down hole pump 80 is used to remove water and entrained coal fines from the coal seam 15 via the drainage pattern 50. Once the water is removed to the surface, it may be treated for separation of methane which may be dissolved in the water and for removal of entrained fines . After sufficient water has been removed from the coal seam 15, pure coal seam gas may be allowed to flow to the surface 14 through the annulus of the substantially vertical well bore 12 around the tubing string 82 and removed via piping attached to a wellhead apparatus. At the surface, the methane is treated, compressed and pumped through a pipeline for use as a fuel in a conventional manner. The down hole pump 80 may be operated continuously or as needed to remove water drained from the coal seam 15 into the enlarged diameter cavity 22.
FIGURES 4-7 illustrate substantially horizontal drainage patterns 50 for accessing the coal seam 15 or other subterranean zone in accordance with one embodiment of the present invention. In this embodiment, the drainage patterns comprise pinnate patterns that have a central diagonal with generally symmetrically arranged and appropriately spaced laterals extending from each side of the diagonal. The pinnate pattern approximates the pattern of veins in a leaf or the design of a feather in that it has similar, substantially parallel, auxiliary drainage bores arranged in substantially equal and parallel spacing or opposite sides of an axis. The pinnate drainage pattern with its central bore and generally symmetrically arranged and appropriately spaced auxiliary drainage bores on each side provides a uniform pattern for draining fluids from a coal seam or other subterranean formation. As described in more detail below, the pinnate pattern provides substantially uniform coverage of a square, other quadrilateral, or grid area and may be aligned with longwall mining panels for preparing the coal seam 15 for mining operations. It will be understood that other suitable drainage patterns may be used in accordance with the present invention.
The pinnate and other suitable drainage patterns drilled from the surface provide surface access to subterranean formations . The drainage pattern may be used to uniformly remove and/or insert fluids or otherwise manipulate a subterranean deposit. In non coal applications, the drainage pattern may be used initiating in-situ burns, "huff-puff" steam operations for heavy crude oil, and the removal of hydrocarbons from low porosity reservoirs .
FIGURE 4 illustrates a pinnate drainage pattern 100 in accordance with one embodiment of the present invention. In this embodiment, the pinnate drainage pattern 100 provides access to a substantially square area 102 of a subterranean zone. A number of the pinnate patterns 60 may be used together to provide uniform access to a large subterranean region.
Referring to FIGURE 4, the enlarged diameter cavity 20 defines a first corner of the area 102. The pinnate pattern 100 includes a substantially horizontal main well bore 104 extending diagonally across the area 102 to a distant corner 106 of the area 102. Preferably, the substantially vertical and articulated well bores 12 and 30 are positioned over the area 102 such that the diagonal bore 104 is drilled up the slope of the coal seam 15. This will facilitate collection of water, gas from the area 102. The diagonal bore 104 is drilled using the articulated drill string 40 and extends from the enlarged cavity 20 in alignment with the articulated well bore 30.
A plurality of lateral well bores 110 extend from the opposites sides of diagonal bore 104 to a periphery 112 of the area 102. The lateral bores 122 may mirror each other on opposite sides of the diagonal bore 104 or may be offset from each other along the diagonal bore 104. Each of the lateral bores 110 includes a radius curving portion 114 coming off of the diagonal bore 104 and an elongated portion 116 formed after the curved portion 114 has reached a desired orientation. For uniform coverage of the square area 102, pairs of lateral bores 110 are substantially evenly spaced on each side of the diagonal bore 104 and extend from the diagonal 64 at an angle of approximately 45 degrees. The lateral bores 110 shorten in length based on progression away from the enlarged diameter cavity 20 in order to facilitate drilling of the lateral bores 110.
The pinnate drainage pattern 100 using a single diagonal bore 104 and five pairs of lateral bores 110 may drain a coal seam area of approximately 150 acres in size. Where a smaller area is to be drained, or where the coal seam has a different shape, such as a long, narrow shape or due to surface or subterranean topography, alternate pinnate drainage patterns may be employed by varying the angle of the lateral bores 110 to the diagonal bore 104 and the orientation of the lateral bores 110. Alternatively, lateral bores 120 can be drilled from only one side of the diagonal bore 104 to form a one-half pinnate pattern. The diagonal bore 104 and the lateral bores 110 are formed by drilling through the enlarged diameter cavity 20 using the articulated drill string 40 and appropriate horizontal drilling apparatus. During this operation, gamma ray logging tools and conventional measurement while drilling technologies may be employed to control the direction and orientation of the drill bit so as to retain the drainage pattern within the confines of the coal seam 15 and to maintain proper spacing and orientation of the diagonal and lateral bores 104 and 110.
In a particular embodiment, the diagonal bore 104 is drilled with an incline at each of a plurality of lateral kick-off points 108. After the diagonal 104 is complete, the articulated drill string 40 is backed up to each successive lateral point 108 from which a lateral bore 110 is drilled on each side of the diagonal 104. It will be understood that the pinnate drainage pattern 100 may be otherwise suitably formed in accordance with the present invention . FIGURE 5 illustrates a pinnate drainage pattern 120 in accordance with another embodiment of the present invention. In this embodiment, the pinnate drainage pattern 120 drains a substantially rectangular area 122 of the coal seam 15. The pinnate drainage pattern 120 includes a main diagonal bore 124 and a plurality of lateral bores 126 that are formed as described in connection with diagonal and lateral bores 104 and 110 of FIGURE 4. For the substantially rectangular area 122, however, the lateral bores 126 on a first side of the diagonal 124 include a shallow angle while the lateral bores 126 on the opposite side of the diagonal 124 include a steeper angle to together provide uniform coverage of the area 12. FIGURE 6 illustrates a quadrilateral pinnate drainage pattern 140 in accordance with another embodiment of the present invention. The quadrilateral drainage pattern 140 includes four discrete pinnate drainage patterns 100 each draining a quadrant of a region 142 covered by the pinnate drainage pattern 140.
Each of the pinnate drainage patterns 100 includes a diagonal well bore 104 and a plurality of lateral well bores 110 extending from the diagonal well bore 104. In the quadrilateral embodiment, each of the diagonal and lateral bores 104 and 110 are drilled from a common articulated well bore 141. This allows tighter spacing of the surface production equipment, wider coverage of a drainage pattern and reduces drilling equipment and operations.
FIGURE 7 illustrates the alignment of pinnate drainage patterns 100 with subterranean structures of a coal seam for degasifying and preparing the coal seam for mining operations in accordance with one embodiment of the present invention. In this embodiment, the coal seam 15 is mined using a longwall process. It will be understood that the present invention can be used to degassify coal seams for other types of mining operations.
Referring to FIGURE 7, coal panels 150 extend longitudinally from a longwall 152. In accordance with longwall mining practices, each panel 150 is subsequently mined from a distant end toward the longwall 152 and the mine roof allowed to cave and fracture into the opening behind the mining process. Prior to mining of the panels 150, the pinnate drainage patterns 100 are drilled into the panels 150 from the surface to degasify the panels 150 well ahead of mining operations . Each of the pinnate drainage patterns 100 is aligned with the longwall 152 and panel 150 grid and covers portions of one or more panels 150. In this way, a region of a mine can be degasified from the surface based on subterranean structures and constraints. FIGURE 8 is a flow diagram illustrating a method for preparing the coal seam 15 for mining operations in accordance with one embodiment of the present invention. In this embodiment, the method begins at step 160 in which areas to be drained and drainage patterns 50 for the areas are identified. Preferably, the areas are aligned with the grid of a mining plan for the region. Pinnate structures 100, 120 and 140 may be used to provide optimized coverage for the region. It will be understood that other suitable patterns may be used to degasify the coal seam 15.
Proceeding to step 162, the substantially vertical well 12 is drilled from the surface 14 through the coal seam 15. Next, at step 164, down hole logging equipment is utilized to exactly identify the location of the coal seam in the substantially well bore 12. At step 164, the enlarged diameter cavity 22 is formed in the substantially vertical well bore 12 at the location of the coal seam 15. As previously discussed, the enlarged diameter cavity 20 may be formed by under reaming and other conventional techniques .
Next, at step 166, the articulated well bore 30 is drilled to intersect the enlarged diameter cavity 22. At step 168, the main diagonal bore 104 for the pinnate drainage pattern 100 is drilled through the articulated well bore 30 into the coal seam 15. After formation of the main diagonal 104, lateral bores 110 for the pinnate drainage pattern 100 are drilled at step 170. As previously described, lateral kick-off points may be formed in the diagonal bore 104 during its formation to facilitate drilling of the lateral bores 110. At step 172, the articulated well bore 30 is capped. Next, at step 174, the enlarged diagonal cavity 22 is cleaned in preparation for installation of downhole production equipment. The enlarged diameter cavity 22 may be cleaned by pumping compressed air down the substantially vertical well bore 12 or other suitable techniques . At step 176, production equipment is installed in the substantially vertical well bore 12. The production equipment includes a sucker rod pump extending down into the cavity 22 for removing water from the coal seam 15. The removal of water will drop the pressure of the coal seam and allow methane gas to diffuse and be produced up the annulus of the substantially vertical well bore 12.
Proceeding to step 178, water that drains from the drainage pattern 100 into the cavity 22 is pumped to the surface with the rod pumping unit. Water may be continuously or intermittently be pumped as needed to remove it from the cavity 22. At step 180, methane gas diffused from the coal seam 15 is continuously collected at the surface 14. Next, at decisional step 182 it is determined whether the production of gas from the coal seam 15 is complete. In one embodiment, the production of gas may be complete after the cost of the collecting the gas exceeds the revenue generated by the well. In another embodiment, gas may continue to be produced from the well until a remaining level of gas in the coal seam 15 is below required levels for mining operations. If production of the gas is not complete, the No branch of decisional step 182 returns to steps 178 and 180 in which water and gas continue to be removed from the coal seam 15. Upon completion of production, the Yes branch of decisional step 182 leads to step 184 in which the production equipment is removed. Next, at decisional step 186, it is determined whether the coal seam 15 is to be further prepared for mining operations. If the coal seam 15 is to be further prepared for mining operations, the Yes branch of decisional step 186 leads to step 188 m which water and other additives may be injected back into the coal seam 15 to rehydrate the coal seam in order to minimize dust, to improve the efficiency of mining, and to improve the mined product.
Step 188 and the No branch of decisional step 186 lead to step 190 m which the coal seam 15 is mined. The removal of the coal from the seam causes the mined roof to cave and fracture into the opening behind the mining process. The collapsed roof creates gob gas which may be collected at step 192 through the substantially vertical well bore 12. Accordingly, additional drilling operations are not required to recover gob gas from a mined coal seam. Step 192 leads to the end of the process by which a coal seam is efficiently degasified from the surface. The method provides a symbiotic relationship with the mine to remove unwanted gas prior to mining and to rehydrate the coal prior to the mining process.
FIGURES 9A through 9C are diagrams illustrating deployment of a well cavity pump 200 in accordance with an embodiment of the present invention. Referring to FIGURE 9A, well cavity pump 200 comprises a well bore portion 202 and a cavity positioning device 204. Well bore portion 202 comprises an inlet 206 for drawing and transferring well fluid contained within cavity 20 to a surface of vertical well bore 12. In this embodiment, cavity positioning device 204 is rotatably coupled to well bore portion 202 to provide rotational movement of cavity positioning device 204 relative to well bore portion 202. For example, a pin, shaft, or other suitable method or device (not explicitly shown) may be used to rotatably couple cavity position device 204 to well bore portion 202 to provide pivotal movement of cavity positioning device 204 about an axis 208 relative to well bore portion 202. Thus, cavity positioning device 204 may be coupled to well bore portion 202 between an end 210 and an end 212 of cavity positioning device 204 such that both ends 210 and 212 may be rotatably manipulated relative to well bore portion 202. Cavity positioning device 204 also comprises a counter balance portion 214 to control a position of ends 210 and 212 relative to well bore portion 202 in a generally unsupported condition. For example, cavity positioning device 204 is generally cantilevered about axis 208 relative to well bore portion 202. Counter balance portion 214 is disposed along cavity positioning device 204 between axis 208 and end 210 such that a weight or mass of counter balance portion 214 counter balances cavity positioning device 204 during deployment and withdrawal of well cavity pump 200 relative to vertical well bore 12 and cavity 20.
In operation, cavity positioning device 204 is deployed into vertical well bore 12 having end 210 and counter balance portion 214 positioned in a generally retracted condition, thereby disposing end 210 and counter balance portion 214 adjacent well bore portion 202. As well cavity pump 200 travels downwardly within vertical well bore 12 in the direction indicated generally by arrow 216, a length of cavity positioning device 204 generally prevents rotational movement of cavity positioning device 204 relative to well bore portion 202. For example, the mass of counter balance portion 214 may cause counter balance portion 214 and end 212 to be generally supported by contact with a vertical wall 218 of vertical well bore 12 as well cavity pump 200 travels downwardly within vertical well bore 12.
Referring to FIGURE 9B, as well cavity pump 200 travels downwardly within vertical well bore 12, counter balance portion 214 causes rotational or pivotal movement of cavity positioning device 204 relative to well bore portion 202 as cavity positioning device 204 transitions from vertical well bore 12 to cavity 20. For example, as cavity positioning device 204 transitions from vertical well bore 12 to cavity 20, counter balance portion 214 and end 212 become generally unsupported by vertical wall 218 of vertical well bore 12. As counter balance portion 214 and end 212 become generally unsupported, counter balance portion 214 automatically causes rotational movement of cavity positioning device 204 relative to well bore portion 202. For example, counter balance portion 214 generally causes end 210 to rotate or extend outwardly relative to vertical well bore 12 in the direction indicated generally by arrow 220. Additionally, end 212 of cavity positioning device 204 extends or rotates outwardly relative to vertical well bore 12 in the direction indicated generally by arrow 222.
The length of cavity positioning device 204 is configured such that ends 210 and 212 of cavity positioning device 204 become generally unsupported by vertical well bore 12 as cavity positioning device 204 transitions from vertical well bore 12 into cavity 20, thereby allowing counter balance portion 214 to cause rotational movement of end 212 outwardly relative to well bore portion 202 and beyond an annulus portion 224 of sump 22. Thus, in operation, as cavity positioning device 204 transitions from vertical well bore 12 to cavity 20, counter balance portion 214 causes end 212 to rotate or extend outwardly in the direction indicated generally by arrow 222 such that continued downward travel of well cavity pump 200 results in contact of end 12 with a horizontal wall 226 of cavity 20. Referring to FIGURE 9C, as downwardly travel of well cavity pump 200 continues, the contact of end 212 with horizontal wall 226 of cavity 20 causes further rotational movement of cavity positioning device 204 relative to well bore portion 202. For example, contact between end 212 and horizontal 226 combined with downward travel of well cavity pump 200 causes end 210 to extend or rotate outwardly relative to vertical well bore 12 in the direction indicated generally by arrow 228 until counter balance portion 214 contacts a horizontal wall 230 of cavity20. Once counter balance portion 214 and end 212 of cavity positioning device 204 become generally supported by horizontal walls 226 and 230 of cavity 20, continued downward travel of well cavity pump 200 is substantially prevented, thereby positioning inlet 206 at a predefined location within cavity 20.
Thus, inlet 206 may be located at various positions along well bore portion 202 such that inlet 206 is disposed at the predefined location within cavity 20 as cavity positioning device 204 bottoms out within cavity 20. Therefore, inlet 206 may be accurately positioned within cavity 20 to substantially prevent drawing in debris or other material disposed within sump or rat hole 22 and to prevent gas interference caused by placement of the inlet 20 in the narrow well bore. Additionally, inlet 206 may be positioned within cavity 20 to maximize fluid withdrawal from cavity 20.
In reverse operation, upward travel of well cavity pump 200 generally results in releasing contact between counter balance portion 214 and end 212 with horizontal walls 230 and 226, respectively. As cavity positioning device 204 becomes generally unsupported within cavity 20, the mass of cavity positioning device 204 disposed between end 212 and axis 208 generally causes cavity positioning device 204 to rotate in directions opposite the directions indicated generally by arrows 220 and 222 as illustrated FIGURE 9B. Additionally, counter balance portion 214 cooperates with the mass of cavity positioning device 204 disposed between end 212 and axis 208 to generally align cavity positioning device 204 with vertical well bore 12. Thus, cavity positioning device 204 automatically becomes aligned with vertical well bore 12 as well cavity pump 200 is withdrawn from cavity 20. Additional upward travel of well cavity pump 200 then may be used to remove cavity positioning device 204 from cavity 20 and vertical well bore 12.
Therefore, the present invention provides greater reliability than prior systems and methods by positively locating inlet 206 of well cavity pump 200 at a predefined location within cavity 20. Additionally, well cavity pump 200 may be efficiently removed from cavity 20 without requiring additional unlocking or alignment tools to facilitate the withdrawal of well cavity pump 200 from cavity 20 and vertical well bore 12.
Although the present invention has been described with several embodiments, various changes and modifications may be suggested to one skilled in the art. It is intended that the present invention encompass such changes and modifications as fall within the scope of the appended claims .

Claims

WHAT IS CLAIMED IS:
1. A method for accessing a subterranean zone from the surface, comprising: drilling a substantially vertical well bore from the surface to the subterranean zone; drilling an articulated well bore from the surface to the subterranean zone, the articulated well bore horizontally offset from the substantially vertical well bore at the surface and intersecting the substantially vertical well bore at a junction proximate to the subterranean zone; and drilling through the articulated well bore a substantially horizontal drainage pattern from the junction into the subterranean zone.
2. The method of Claim 1, further comprising: forming an enlarged cavity in the substantially vertical well bore proximate to the subterranean zone; drilling the articulated well bore to intersect the large cavity of the substantially vertical well bore; and drilling through the articulated well bore the substantially horizontal drainage pattern from the enlarged cavity into the subterranean zone.
3. The method of Claim 1, wherein the subterranean zone comprises a coal seam.
4. The method Claim 1, wherein the subterranean zone comprises an oil reservoir.
5. The method of Claim 1, further comprising producing fluid from the subterranean zone through the substantially vertical well bore.
6. The method of Claim 1, further comprising: installing a substantially vertical rod pumping unit into the substantially vertical well bore with a pump inlet proximate to the junction; and operating the substantially vertical rod pumping unit to produce fluid from the subterranean zone.
7. The method of Claim 1, wherein the subterranean zone comprises a low-pressure zone.
8. The method of Claim 1, drilling the substantially horizontal drainage pattern from the junction into the subterranean zone comprising: drilling a substantially horizontal diagonal well bore from the junction defining a first set of an area in the subterranean zone to a distant end of the area; drilling a first set of substantially horizontal lateral well bores in space relation to each other from the diagonal to the periphery of the area on a first side of the diagonal well bore; and drilling a second set of substantially horizontal lateral well bores in space relation to each other from the diagonal well bore to the periphery of the area on a second, opposite side of the diagonal well bore.
9. The method of Claim 8, wherein the lateral well bores each substantially extend at an angle of about 45 degrees from the diagonal well bore.
10. The method of Claim 8, wherein the area in the subterranean zone is substantially quadrilateral in shape.
11. The method of Claim 8, wherein the area in the subterranean zone is substantially square in shape.
12. The method of Claim 1, drilling the substantially horizontal drainage pattern from the junction into the subterranean zone comprising: drilling the drainage pattern using an articulated drill string extending through the articulated well bore and the junction; supplying drilling fluid down through the articulated drill string and back up through an annulus between the articulated drill string and the articulated well bore to remove cuttings generated by the articulated drill string in drilling the drainage pattern; injecting a drilling gas into the substantially vertical wall bore; and mixing the drilling gas with the drilling fluid at the junction to reduce hydrostatic pressure on the subterranean zone during the drilling of the drainage pattern.
13. The method of Claim 12, wherein the drilling gas comprises air.
14. The method of Claim 12, wherein the subterranean zone comprises a low-pressure reservoir having a pressure below 250 pounds per square inch (psi) .
15. The method of Claim 1, drilling the substantially horizontal drainage pattern from the junction into the subterranean zone comprising: drilling the drainage pattern using an articulated drill stream extending through the articulated well bore and the junction; supplying drilling fluid down through the articulated drill string to remove cutting generated by the drill string in drilling the drainage pattern; and pumping drilling fluid with cuttings back up through the substantially vertical well bore to reduce hydrostatic pressure on the subterranean zone during drilling of the drainage pattern.
16. The method of Claim 15, wherein the subterranean zone comprises an ultra low pressure reservoir having the pressure below 150 pounds per square inch (psi) .
17. A system for accessing a subterranean zone from the surface, comprising: a substantially vertical well bore extending from the surface to the subterranean zone; an articulated well bore extending from the surface to the subterranean zone, the articulated well bore horizontally offset from the substantially vertical well bore at the surface and intercepting the substantially vertical well bore at a junction proximate to the subterranean zone; and a substantially horizontal drainage pattern extending from the junction into the subterranean zone.
18. The system of Claim 17, the junction further comprising an enlarged cavity formed in the substantially vertical well bore proximate to the subterranean zone.
19. The system of Claim 17, wherein the subterranean zone comprises a coal seam.
20. The system of Claim 17, wherein the subterranean zone comprises an oil reservoir.
21. The system of Claim 17, wherein the subterranean zone comprises a low pressure reservoir.
22. The system of Claim 17, wherein the subterranean zone comprises an ultra low pressure reservoir having a pressure below 150 pounds per square inch (psi) .
23. The system of Claim 17, further comprising the substantially vertical rod pumping unit positioned in the substantially vertical well bore and operable to pump fluid drained from the subterranean zone to the junction to the surface.
24. The system of Claim 23, wherein the substantially vertical rod pumping unit comprises a sucker rod pump.
25. The system of Claim 17, the substantially horizontal drainage pattern comprising: a substantially horizontal diagonal well bore extending from the junction defining a first end of an area in the subterranean zone to a distant end of the area; a first set of substantially horizontal lateral well bores in space relation to each other extending from the diagonal to the periphery of the area on a first side of the diagonal well bore; and a second set of substantially horizontal lateral well bores in space relation to each other extending from the diagonal to the periphery of the area on a second, opposite side of the diagonal well bore.
26. The system of Claim 25, wherein the lateral well bores each substantially extend at an angle of about 45 degrees from the diagonal well bore.
27. The system of Claim 25, wherein the area in the subterranean zone is substantially quadrilateral in shape.
28. The system of Claim 25, wherein the area in the subterranean zone is substantially square in shape.
29. A substantially horizontal subterranean drainage pattern for accessing an area of a subterranean zone from the surface, comprising: a substantially horizontal diagonal well bore extending from a surface well bore defining a first end of the area in the subterranean zone to a distant end of the area; a first set of substantially horizontal lateral well bores extending in space relation to each other from the diagonal well bore to the periphery of the area on a first side of the diagonal well bore; and a second set of substantially horizontal lateral well bores extending in space relation to each other from the diagonal well bore to the periphery of the area on a second, opposite side of the diagonal.
30. The subterranean drainage pattern of Claim 29, wherein the lateral well bores are progressively shorter as they progress away from the surface well bore.
31. The subterranean drainage pattern of Claim 29, wherein the lateral well bores each substantially extend at an angle of between 40 and 50 degrees from the diagonal well bore.
32. The subterranean drainage pattern of Claim 29, wherein the lateral well bores each substantially extend at an angle of about 45 degrees from the diagonal well bore.
33. The subterranean drainage pattern of Claim 29, wherein the area substantially comprises a quadrilateral and the ends comprise distant corners of the quadrilateral.
34. The subterranean drainage pattern of Claim 29, wherein the area substantially comprises a square and the ends comprise opposite ends of the square.
35. The subterranean drainage pattern of Claim 29, wherein the substantially horizontal diagonal and lateral well bores provide substantially uniform coverage of the area .
36. The subterranean drainage pattern of Claim 29, wherein the lateral well bores in each set are substantially evenly spaced from each other.
37. A structure for accessing a region of a subterranean zone, comprising: a first substantially vertical well bore substantially defining an end of the first area in the region; a second substantially vertical well bore substantially defining an end of a second area in the region adjacent to the first area; an articulated well bore including a first portion intersecting the first substantially vertical well bore at a first junction and a second portion intersecting the second substantially vertical well bore at a second junction; a first substantially horizontal diagonal well bore extending from the first junction in line with the first portion of the articulated well bore to a distant end of the first area; a second substantially horizontal diagonal well bore extending from the second junction in line with the second portion of the articulated well bore to a distant end of the second area; and each diagonal well bore comprising a plurality of substantially horizontal lateral well bores extending from the diagonal well bore to a periphery of the area containing the diagonal well bore.
38. The structure of Claim 37, the lateral well bores extending from each of the diagonal well bores comprising: a first set of lateral well bores extending from the diagonal well bore to the periphery of the area on a first side of the diagonal well bore; and a second set of lateral well bores extending from the diagonal well bore to the periphery of the area on a second, opposite side of the diagonal well bore.
39. The structure of Claim 38, wherein the lateral well bores are substantially evenly spaced from each other.
40. The structure of Claim 38, wherein the lateral well bores are progressively shorter as they progress away from the substantially vertical well bore of the area.
41. The structure of Claim 37, further comprising: a third substantially vertical well bore substantially defining an end of a third area; a fourth substantially vertical well bore substantially defining an end of a fourth area; the articulated well bore including a third portion intersecting the third substantially vertical well bore at a third junction and a fourth portion intersecting the fourth substantially vertical well bore at a fourth junction; a third substantially horizontal diagonal well bore extending from the third junction in line with the third portion of the articulated well bore to a distant end of the third area; and a fourth substantially horizontal diagonal well bore extending from the fourth junction in line with the fourth portion of the articulated well bore to a distant end of the fourth area.
42. A method for forming a subterranean drainage pattern for accessing an area of a subterranean zone from the surface, comprising: drilling through an articulated well bore a substantially horizontal diagonal well bore between opposite ends of the area in the subterranean zone; inclining the substantially horizontal diagonal well bore at each of the plurality of lateral points; and after drilling the diagonal well bore with an articulated drill string, backing the articulated drill string back to each successive lateral point and from the lateral point drilling a first lateral well bore to the periphery of the area on the first side of the diagonal well bore and a second lateral well bore to the periphery of the area on the second side of the diagonal well bore.
43. The method of Claim 42, further comprising, substantially evenly spacing the lateral points along the diagonal well bore.
44. The method of Claim 42, further comprising drilling the first and second laterals from each lateral point at substantially a 45 degree angle from the diagonal.
45. The method of Claim 42, wherein the area is substantially quadrilateral in shape.
46. The method of Claim 42, wherein the area is substantially square in shape.
47. The method of Claim 42, further comprising drilling each first and second lateral from each successive lateral point to a length greater than that of the first and second lateral for the previous lateral point.
48. A method for preparing a subterranean zone for mining, comprising: drilling a substantially vertical well bore from the surface to the subterranean zone; drilling an articulated well bore from the surface to the subterranean zone, the articulated well bore horizontally offset from the substantially vertical well bore at the surface and intercepting the substantially vertical well bore at a junction proximate to the subterranean zone; drilling through the articulated well bore a substantially horizontal drainage pattern from the junction into the subterranean zone; drainage water from the subterranean zone through the drainage pattern into the junction; pumping the water from the junction to the surface through the substantially vertical well bore; and producing gas from the subterranean zone through at least one of the substantially vertical and articulated well bores .
49. The method of Claim 48, wherein the junction comprises an enlarged cavity formed in the substantially vertical well bore.
50. The method of Claim 48, wherein the subterranean zone comprises a coal seam.
51. The method of Claim 48, further comprising: installing a substantially vertical rod pumping unit in the substantially vertical well bore with a pump inlet position proximate to the junction; and pumping water from the junction to the surface through the substantially vertical rod pumping unit.
52. The method of Claim 48, wherein the subterranean zone comprises a low pressure zone.
53. The method of Claim 48, drilling the substantially horizontal draining pattern from the junction comprising : drilling a diagonal well bore from the junction defining a first end of an area aligned with a subterranean coal panel to an opposite corner of the area; drilling a plurality of lateral well bores on each side of the diagonal well bore into one or more coal panels .
54. The method of Claim 53, wherein the draining pattern comprises a pinnate structure.
55. The method of Claim 48, further comprising rehydrating the subterranean zone after completion of degasification of the subterranean zone by pumping water into the subterranean zone through the drainage pattern.
56. The method of Claim 55, further comprising pumping additives into the subterranean zone through the drainage pattern.
57. The method of Claim 48, further comprising producing gob gas from the subterranean zone through at least one of the substantially vertical and articulated well bores upon the completion of mining of the area of the subterranean zone into which the draining pattern extends.
58. A cavity well pump comprising: a well bore portion having an inlet operable to draw well fluid from a subterranean cavity; and a cavity positioning device coupled to the well bore portion, the cavity positioning device operable to extend from a first position to a second position within the subterranean cavity to position the inlet at a predefined location within the subterranean cavity.
59. The cavity well pump of Claim 58, wherein the cavity positioning device is rotatably coupled to the well portion, and wherein the cavity positioning device is operable to rotate from the first position to the second position.
60. The cavity well pump of Claim 58, wherein the cavity positioning device automatically extends from the first position to the second position as the cavity positioning device transitions from a vertical well bore to the subterranean cavity.
61. The cavity well pump of Claim 60, wherein the cavity positioning device is further operable to retract from the second position to the first position as the cavity positioning device is withdrawn from the subterranean cavity.
62. The cavity well pump of Claim 58, wherein the cavity positioning device comprises a first end and a second end, the cavity positioning device pivotally coupled to the well portion between the first and second ends, the cavity positioning device having a counterbalance portion disposed on the first end and operable to rotate the second end outwardly into the subterranean cavity as the cavity positioning device transitions from a vertical well bore into the subterranean cavity.
63. The cavity well pump of Claim 62, wherein the counterbalance portion is further operable to align the cavity positioning device with the vertical well bore for withdrawal of the cavity positioning device from the subterranean cavity.
64. The cavity well pump of Claim 58, wherein the cavity positioning device comprises a first end and a second end, the first and second ends operable to extend outwardly in substantially opposite directions to dispose the cavity positioning device in the second position, and wherein the cavity positioning device is operable to contact a portion of the subterranean cavity to position the inlet in the predefined location.
65. The cavity well pump of Claim 58, wherein the cavity positioning device contacts a portion of the subterranean cavity in the second position to substantially prevent downward travel of the inlet into a sump.
66. A method for producing gas from a subterranean coal seam, said method comprising: drilling a first, substantially vertical, well bore intersecting said coal seam; forming an enlarged diameter cavity in said first well bore at the depth of said coal seam; drilling a second well bore offset horizontally from said first well bore, said second well bore including a substantially horizontal portion intersecting said cavity; and drilling a substantially horizontal main drainage well bore in said coal seam, said drainage well bore intersecting said cavity, whereby, said gas may be produced from said coal seam through said drainage well bore.
67. The method according to Claim 66 comprising additionally the step of producing gas from said coal seam.
68. The method according to Claim 67 wherein said coal seam contains excess water and comprising additionally the steps of installing a pump in said cavity, draining said water from said coal seam through said drainage well bore, and pumping said water up through the bore of said first well.
69. The method according to Claim 66 comprising additionally drilling a plurality of secondary drainage well bores in said coal seam, said drainage bores intersecting said main drainage well bore.
70. The method according to Claim 69 wherein said main and auxiliary drainage well bores from a pinnate pattern .
71. A method of producing gas from a subterranean coal seam, said method comprising: drilling a first, substantially straight, well bore from the surface to intersect said coal seam; logging said first well bore to identify the depth of said coal seam; forming an enlarged diameter cavity in said first well bore at substantially the depth of said coal seam; drilling an offset well bore from the surface to intersect said cavity; utilizing said offset well bore to drill a substantially horizontal main drainage well bore in said coal seam and intersecting said cavity and a plurality of secondary drainage bores in said coal seam, each of said secondary drainage well bores intersecting said main drainage well bore; draining water from said coal seam through said secondary and main drainage well bores into said cavity; pumping said water from said cavity to the surface through said first well bore; flowing gas from said coal seam through said secondary and main drainage well bores; and conducting said gas to the surface through said first well bore.
72. The method according to Claim 71 wherein said main and secondary drainage well bores from a pinnate pattern .
73. A method for providing drainage well bores in a subterranean coal seam, said method comprising: providing a first, substantially straight well bore extending from the surface to at least the depth of said coal seam; logging said first well bore to identify the depth where said coal seam intersects said first well bore; enlarging the diameter of said first well bore at substantially the depth of said coal seam to provide a cavity at substantially the depth of said coal seam and in communication with said first well bore; drilling an offset well bore spaced horizontally from said first well bore, said offset well bore including a substantially vertical portion extending from the surface to a depth less than the depth of said coal seam, a substantially horizontal portion intersecting said cavity, and a curved portion connecting said vertical and horizontal portions; utilizing an articulated drill string extending through said offset well bore and said cavity to drill a main drainage well bore into said coal seam; supplying drilling fluid down through said articulated drill string and back up through the annulus between said offset well bore and said articulated drill string to remove cuttings from said main drainage well bore; and admixing compressed air with said drilling fluid to reduce the hydrostatic pressure in said main drainage bore to thereby decrease the possibility of over balanced drilling conditions in said drainage bore.
74. The method according to Claim 73 wherein at least a portion of said compressed air is supplied through said articulated drill string.
75. The method according to Claim 73 wherein at least a portion of said compressed air is supplied through said first well bore.
76. The method according to Claim 73 comprising additionally the steps of removing said articulated drill string from said drainage well bore and said offset well bore; capping said offset well bore; draining water and flowing gas from said coal seam through said drainage well bore; conducting said water to the surface through said main well bore; and conducting said methane gas to the surface through said main well bore.
77. In a process for mining coal in a subterranean coal seam the improvement comprising: a pre-mining said coal seam to remove excess water and dangerous gases therefrom in advance of mining said coal in said coal seam, said pre-mining comprising, providing a substantially straight well bore communicating between the surface and said coal seam; providing an enlarged diameter cavity in said well bore at approximately the depth of said coal seam; drilling a substantially horizontal drainage bore in said coal seam, said drainage bore communicating with said cavity; draining said excess water and flowing said dangerous gases from said coal seam through said drainage well bore and into said cavity; conducting said water and dangerous gases from said cavity to the surface through said substantially straight well bore; and continuing said steps of draining water and flowing gas from said coal seam and to said cavity and of conducting said water and gas to the surface until the desired amounts of water and gas have been removed from said coal seam.
78. The method according to Claim 77 comprising additionally providing a plurality of secondary drainage well bores in said coal seam in communication with said main drain bore.
79. The method according to Claim 78 wherein said main drain bore and secondary drain bores from a pinnate pattern .
PCT/US1999/027494 1998-11-20 1999-11-19 Method and system for accessing subterranean deposits from the surface WO2000031376A2 (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
AT99965010T ATE309449T1 (en) 1998-11-20 1999-11-19 METHOD AND APPARATUS FOR ACCESSING UNDERGROUND STORES FROM THE SURFACE
PL99375239A PL193562B1 (en) 1998-11-20 1999-11-19 Underground drainage path for accessing the underground zone and the method for forming an underground drainage path for accessing the underground zone
PL99375236A PL193560B1 (en) 1998-11-20 1999-11-19 Method and system for accessing subterranean deposits from the surface
PL99348705A PL190694B1 (en) 1998-11-20 1999-11-19 Method and system for accessing subterranean deposits from the surface
PL99375240A PL193557B1 (en) 1998-11-20 1999-11-19 System for obtaining access to underground zone
NZ512303A NZ512303A (en) 1998-11-20 1999-11-19 Method and system for accessing subterranean deposits from the surface by forming a well bore pattern
PL375238A PL192352B1 (en) 1998-11-20 1999-11-19 Method of mining from a thin bed of hard coal deposits
EP99965010A EP1131535B1 (en) 1998-11-20 1999-11-19 Method and system for accessing subterranean deposits from the surface
PL99375241A PL193558B1 (en) 1998-11-20 1999-11-19 Method of forming an underground drainage path for accessing the underground zone from the surface
PL99375242A PL193559B1 (en) 1998-11-20 1999-11-19 Method of and system for obtaining access to underground zone
PL99375237A PL193561B1 (en) 1998-11-20 1999-11-19 Method of winning gas from subterranean deposits and system therefor
PL99375243A PL193555B1 (en) 1998-11-20 1999-11-19 Method for obtaining access to thin coal bed
CA002350504A CA2350504C (en) 1998-11-20 1999-11-19 Method and system for accessing subterranean deposits from the surface
DE69928280T DE69928280T2 (en) 1998-11-20 1999-11-19 METHOD AND DEVICE FOR ACCESSING SUB-ORIENTED STORAGE SITES FROM THE SURFACE
AU31018/00A AU760896B2 (en) 1998-11-20 1999-11-19 Method and system for accessing subterranean deposits from the surface
AU2003200203A AU2003200203B2 (en) 1998-11-20 2003-01-22 Method and system for accessing subterranean deposits from the surface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/197,687 US6280000B1 (en) 1998-11-20 1998-11-20 Method for production of gas from a coal seam using intersecting well bores
US09/197,687 1998-11-20

Publications (2)

Publication Number Publication Date
WO2000031376A2 true WO2000031376A2 (en) 2000-06-02
WO2000031376A3 WO2000031376A3 (en) 2001-01-04

Family

ID=22730357

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/027494 WO2000031376A2 (en) 1998-11-20 1999-11-19 Method and system for accessing subterranean deposits from the surface

Country Status (15)

Country Link
US (12) US6280000B1 (en)
EP (4) EP1619352B1 (en)
CN (5) CN101328791A (en)
AT (4) ATE334297T1 (en)
AU (9) AU760896B2 (en)
CA (9) CA2483023C (en)
CZ (1) CZ20011757A3 (en)
DE (4) DE69937976T2 (en)
ES (3) ES2271398T3 (en)
ID (1) ID30391A (en)
NZ (3) NZ527146A (en)
PL (9) PL193558B1 (en)
RU (6) RU2505657C2 (en)
WO (1) WO2000031376A2 (en)
ZA (1) ZA200103917B (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002029210A1 (en) * 2000-10-02 2002-04-11 Pompiliu Gheorghe Dinca Draining network for producing oil
WO2002059455A1 (en) * 2001-01-24 2002-08-01 Cdx Gas, L.L.C. Method and system for enhanced access to a subterranean zone
WO2002061233A1 (en) * 2001-01-30 2002-08-08 Cdx Gas, L.L.C. Method and system for accessing subterranean zones from a limited surface area
WO2002061238A1 (en) * 2001-01-30 2002-08-08 Cdx Gas, L.L.C. Method and system for accessing a subterranean zone from a limited surface area
US6681855B2 (en) * 2001-10-19 2004-01-27 Cdx Gas, L.L.C. Method and system for management of by-products from subterranean zones
US6708764B2 (en) * 2002-07-12 2004-03-23 Cdx Gas, L.L.C. Undulating well bore
US6725922B2 (en) * 2002-07-12 2004-04-27 Cdx Gas, Llc Ramping well bores
US6932168B2 (en) 2003-05-15 2005-08-23 Cnx Gas Company, Llc Method for making a well for removing fluid from a desired subterranean formation
CN100392209C (en) * 2005-04-20 2008-06-04 太原理工大学 Rock salt deposit horizontal chamber type oil-gas depot and its building method
CN102086774A (en) * 2011-01-17 2011-06-08 中联煤层气国家工程研究中心有限责任公司 Drainage method of gas in coal bed
CN101699033B (en) * 2009-10-27 2011-12-21 山西焦煤集团有限责任公司 Device for pumping and draining water from downward hole of coal bed
CN102587981A (en) * 2012-03-12 2012-07-18 中国石油大学(华东) Underground salt cavern gas storage and building method thereof
DE10320401B4 (en) * 2003-05-06 2015-04-23 Udo Adam Process for mine gas production
CN106930733A (en) * 2017-05-10 2017-07-07 中国神华能源股份有限公司 Coal bed gas group wells extraction system and method for construction
RU2708743C1 (en) * 2019-04-30 2019-12-11 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Method of drilling offshoots from an openhole well horizontal part
RU2709262C1 (en) * 2019-08-30 2019-12-17 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Method of drilling and development of offshoot from horizontal well (versions)
RU2709263C1 (en) * 2019-04-30 2019-12-17 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Method of drilling and development of offshoots from horizontal well
RU2771371C1 (en) * 2021-08-23 2022-05-04 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Set of assemblies for increasing the filtration area of ​​the bottomhole zone of an open horizontal well

Families Citing this family (208)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6729394B1 (en) * 1997-05-01 2004-05-04 Bp Corporation North America Inc. Method of producing a communicating horizontal well network
US7025154B2 (en) * 1998-11-20 2006-04-11 Cdx Gas, Llc Method and system for circulating fluid in a well system
US8297377B2 (en) 1998-11-20 2012-10-30 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US7073595B2 (en) * 2002-09-12 2006-07-11 Cdx Gas, Llc Method and system for controlling pressure in a dual well system
US20040035582A1 (en) * 2002-08-22 2004-02-26 Zupanick Joseph A. System and method for subterranean access
US8376052B2 (en) 1998-11-20 2013-02-19 Vitruvian Exploration, Llc Method and system for surface production of gas from a subterranean zone
US6988548B2 (en) * 2002-10-03 2006-01-24 Cdx Gas, Llc Method and system for removing fluid from a subterranean zone using an enlarged cavity
US7048049B2 (en) 2001-10-30 2006-05-23 Cdx Gas, Llc Slant entry well system and method
US6679322B1 (en) 1998-11-20 2004-01-20 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US6280000B1 (en) 1998-11-20 2001-08-28 Joseph A. Zupanick Method for production of gas from a coal seam using intersecting well bores
US6923275B2 (en) * 2001-01-29 2005-08-02 Robert Gardes Multi seam coal bed/methane dewatering and depressurizing production system
US7243738B2 (en) * 2001-01-29 2007-07-17 Robert Gardes Multi seam coal bed/methane dewatering and depressurizing production system
US6591903B2 (en) 2001-12-06 2003-07-15 Eog Resources Inc. Method of recovery of hydrocarbons from low pressure formations
US6679326B2 (en) * 2002-01-15 2004-01-20 Bohdan Zakiewicz Pro-ecological mining system
US6968893B2 (en) * 2002-04-03 2005-11-29 Target Drilling Inc. Method and system for production of gas and water from a gas bearing strata during drilling and after drilling completion
US6810960B2 (en) * 2002-04-22 2004-11-02 Weatherford/Lamb, Inc. Methods for increasing production from a wellbore
US7360595B2 (en) * 2002-05-08 2008-04-22 Cdx Gas, Llc Method and system for underground treatment of materials
US6991048B2 (en) * 2002-07-12 2006-01-31 Cdx Gas, Llc Wellbore plug system and method
US6991047B2 (en) * 2002-07-12 2006-01-31 Cdx Gas, Llc Wellbore sealing system and method
US7025137B2 (en) * 2002-09-12 2006-04-11 Cdx Gas, Llc Three-dimensional well system for accessing subterranean zones
US8333245B2 (en) 2002-09-17 2012-12-18 Vitruvian Exploration, Llc Accelerated production of gas from a subterranean zone
US7094811B2 (en) 2002-10-03 2006-08-22 Bayer Corporation Energy absorbing flexible foams produced in part with a double metal cyanide catalyzed polyol
US6953088B2 (en) * 2002-12-23 2005-10-11 Cdx Gas, Llc Method and system for controlling the production rate of fluid from a subterranean zone to maintain production bore stability in the zone
US7264048B2 (en) * 2003-04-21 2007-09-04 Cdx Gas, Llc Slot cavity
US7134494B2 (en) * 2003-06-05 2006-11-14 Cdx Gas, Llc Method and system for recirculating fluid in a well system
WO2005005763A2 (en) * 2003-06-09 2005-01-20 Precision Drilling Technology Services Group, Inc. Method for drilling with improved fluid collection pattern
AU2003244819A1 (en) * 2003-06-30 2005-01-21 Petroleo Brasileiro S A-Petrobras Method for, and the construction of, a long-distance well for the production, transport, storage and exploitation of mineral layers and fluids
US7073577B2 (en) * 2003-08-29 2006-07-11 Applied Geotech, Inc. Array of wells with connected permeable zones for hydrocarbon recovery
US7051809B2 (en) * 2003-09-05 2006-05-30 Conocophillips Company Burn assisted fracturing of underground coal bed
US7100687B2 (en) * 2003-11-17 2006-09-05 Cdx Gas, Llc Multi-purpose well bores and method for accessing a subterranean zone from the surface
US7163063B2 (en) * 2003-11-26 2007-01-16 Cdx Gas, Llc Method and system for extraction of resources from a subterranean well bore
US7419223B2 (en) * 2003-11-26 2008-09-02 Cdx Gas, Llc System and method for enhancing permeability of a subterranean zone at a horizontal well bore
US20060201714A1 (en) * 2003-11-26 2006-09-14 Seams Douglas P Well bore cleaning
US20060201715A1 (en) * 2003-11-26 2006-09-14 Seams Douglas P Drilling normally to sub-normally pressured formations
US7445045B2 (en) * 2003-12-04 2008-11-04 Halliburton Energy Services, Inc. Method of optimizing production of gas from vertical wells in coal seams
US7104320B2 (en) * 2003-12-04 2006-09-12 Halliburton Energy Services, Inc. Method of optimizing production of gas from subterranean formations
US7207395B2 (en) * 2004-01-30 2007-04-24 Cdx Gas, Llc Method and system for testing a partially formed hydrocarbon well for evaluation and well planning refinement
US7207390B1 (en) * 2004-02-05 2007-04-24 Cdx Gas, Llc Method and system for lining multilateral wells
US7222670B2 (en) * 2004-02-27 2007-05-29 Cdx Gas, Llc System and method for multiple wells from a common surface location
US20050241834A1 (en) * 2004-05-03 2005-11-03 Mcglothen Jody R Tubing/casing connection for U-tube wells
US7278497B2 (en) * 2004-07-09 2007-10-09 Weatherford/Lamb Method for extracting coal bed methane with source fluid injection
RU2007110806A (en) * 2004-08-24 2008-10-10 Кростек Менеджмент Корп. (Ca) ROCKING PUMP DEVICE AND PUMPING METHOD
US20050051326A1 (en) * 2004-09-29 2005-03-10 Toothman Richard L. Method for making wells for removing fluid from a desired subterranean
US7581592B1 (en) 2004-11-24 2009-09-01 Bush Ronald R System and method for the manufacture of fuel, fuelstock or fuel additives
US7353877B2 (en) * 2004-12-21 2008-04-08 Cdx Gas, Llc Accessing subterranean resources by formation collapse
US7311150B2 (en) * 2004-12-21 2007-12-25 Cdx Gas, Llc Method and system for cleaning a well bore
US7225872B2 (en) * 2004-12-21 2007-06-05 Cdx Gas, Llc Perforating tubulars
US7299864B2 (en) * 2004-12-22 2007-11-27 Cdx Gas, Llc Adjustable window liner
WO2006076547A2 (en) * 2005-01-14 2006-07-20 Halliburton Energy Services, Inc. System and method for producing fluids from a subterranean formation
CN1317483C (en) * 2005-03-25 2007-05-23 北京奥瑞安能源技术开发有限公司 Method of entering target geologic body and system
CN100420824C (en) * 2005-04-21 2008-09-24 新奥气化采煤有限公司 Underground coal gasification
US7571771B2 (en) * 2005-05-31 2009-08-11 Cdx Gas, Llc Cavity well system
US20060175061A1 (en) * 2005-08-30 2006-08-10 Crichlow Henry B Method for Recovering Hydrocarbons from Subterranean Formations
US7493951B1 (en) 2005-11-14 2009-02-24 Target Drilling, Inc. Under-balanced directional drilling system
CN100455769C (en) * 2005-12-22 2009-01-28 中国石油大学(华东) Method for extracting hydrate on bottom of sea by deep earth heart water circulation
US7647967B2 (en) * 2006-01-12 2010-01-19 Jimni Development LLC Drilling and opening reservoir using an oriented fissure to enhance hydrocarbon flow and method of making
US8261820B2 (en) 2006-01-12 2012-09-11 Jimni Development LLC Drilling and opening reservoirs using an oriented fissure
AU2007264957A1 (en) * 2006-06-28 2008-01-03 Richard E. Scallen Dewatering apparatus
US20080016768A1 (en) 2006-07-18 2008-01-24 Togna Keith A Chemically-modified mixed fuels, methods of production and used thereof
US8622608B2 (en) * 2006-08-23 2014-01-07 M-I L.L.C. Process for mixing wellbore fluids
US8044819B1 (en) 2006-10-23 2011-10-25 Scientific Drilling International Coal boundary detection using an electric-field borehole telemetry apparatus
US7812647B2 (en) * 2007-05-21 2010-10-12 Advanced Analogic Technologies, Inc. MOSFET gate drive with reduced power loss
AU2008284063B2 (en) 2007-08-03 2015-01-22 Pine Tree Gas, Llc Flow control system having an isolation device for preventing gas interference during downhole liquid removal operations
US7832468B2 (en) * 2007-10-03 2010-11-16 Pine Tree Gas, Llc System and method for controlling solids in a down-hole fluid pumping system
AU2008347220A1 (en) * 2008-01-02 2009-07-16 Joseph A. Zupanick Slim-hole parasite string
GB2459082B (en) * 2008-02-19 2010-04-21 Phillip Raymond Michael Denne Improvements in artificial lift mechanisms
US8137779B2 (en) * 2008-02-29 2012-03-20 Ykk Corporation Of America Line of sight hose cover
CA2717366A1 (en) 2008-03-13 2009-09-17 Pine Tree Gas, Llc Improved gas lift system
WO2009129143A1 (en) 2008-04-18 2009-10-22 Shell Oil Company Systems, methods, and processes utilized for treating hydrocarbon containing subsurface formations
US8740310B2 (en) * 2008-06-20 2014-06-03 Solvay Chemicals, Inc. Mining method for co-extraction of non-combustible ore and mine methane
WO2010012771A2 (en) 2008-08-01 2010-02-04 Solvay Chemicals, Inc. Traveling undercut solution mining systems and methods
WO2010016767A2 (en) * 2008-08-08 2010-02-11 Ziebel As Subsurface reservoir drainage system
WO2010045115A2 (en) 2008-10-13 2010-04-22 Shell Oil Company Treating subsurface hydrocarbon containing formations and the systems, methods, and processes utilized
RU2389909C1 (en) * 2009-01-30 2010-05-20 Борис Анатольевич ДУДНИЧЕНКО Well jet pumping unit for degassing of coal beds
US20110005762A1 (en) * 2009-07-09 2011-01-13 James Michael Poole Forming Multiple Deviated Wellbores
CN101603431B (en) * 2009-07-14 2011-05-11 中国矿业大学 Method for reinforcing outburst-prone coal seam cross-cut coal uncovering
US8229488B2 (en) * 2009-07-30 2012-07-24 Sony Ericsson Mobile Communications Ab Methods, apparatuses and computer programs for media content distribution
CN101649740B (en) * 2009-09-03 2011-08-31 周福宝 Ground bored well body structure for gas extraction
CN102053249B (en) * 2009-10-30 2013-04-03 吴立新 Underground space high-precision positioning method based on laser scanning and sequence encoded graphics
ES2371429B1 (en) * 2009-11-24 2012-08-30 Antonio Francisco Soler Terol PERFECTED SYSTEM OF ACCESS TO UNDERGROUND VERTICAL DUCTS.
WO2011084497A1 (en) * 2009-12-15 2011-07-14 Chevron U.S.A. Inc. System, method and assembly for wellbore maintenance operations
CN101732929B (en) * 2010-02-11 2012-05-30 常熟理工学院 Blade lattice streaming gravity buoyancy device
US9127538B2 (en) 2010-04-09 2015-09-08 Shell Oil Company Methodologies for treatment of hydrocarbon formations using staged pyrolyzation
WO2011127292A1 (en) * 2010-04-09 2011-10-13 Shell Oil Company Methods for heating with slots in hydrocarbon formations
CN101806207A (en) * 2010-04-26 2010-08-18 徐萍 Horizontal well three-dimensional intersection well pattern structure
CN101818620B (en) * 2010-04-26 2013-04-10 徐萍 Mining method for maximum reservoir contact well
CN101915072B (en) * 2010-08-04 2014-03-26 中煤科工集团重庆研究院 Method for extracting coal bed gas in stable mining region by ground well drilling
CN101936155B (en) * 2010-08-04 2014-06-04 北京奥瑞安能源技术开发有限公司 Distributed structure of horizontal section of multi-branch horizontal coal bed methane well
CN101936142B (en) * 2010-08-05 2012-11-28 北京奥瑞安能源技术开发有限公司 Aerated underbalanced drilling method for coal-bed gas
WO2012027110A1 (en) 2010-08-23 2012-03-01 Wentworth Patent Holdings Inc. Method and apparatus for creating a planar cavern
US8646846B2 (en) 2010-08-23 2014-02-11 Steven W. Wentworth Method and apparatus for creating a planar cavern
US9359876B2 (en) 2010-08-27 2016-06-07 Well Control Technologies, Inc. Methods and apparatus for removing liquid from a gas producing well
CA3023007A1 (en) * 2010-08-27 2012-03-01 Cnx Gas Company Llc A method and apparatus for removing liquid from a gas producing well
CN101967974B (en) * 2010-09-13 2012-07-25 灵宝金源矿业股份有限公司 Method for crossed operation of vertical shaft backward-excavation deepening and exploitation projects
CN101975055B (en) * 2010-09-17 2013-03-06 北京奥瑞安能源技术开发有限公司 Method for remediating trouble well of coal bed gas multi-branch horizontal well
CN101949284A (en) * 2010-09-25 2011-01-19 北京奥瑞安能源技术开发有限公司 Coalbed methane horizontal well system and construction method thereof
CN102080568B (en) * 2010-11-19 2012-10-31 河北联合大学 Method for reducing water pressure of covering layer of mine transferred from opencast mine to underground mine
CN102146797B (en) * 2011-01-21 2012-12-12 中国矿业大学 Short-section temporary gob-side entry retaining method
CN102116167B (en) * 2011-01-25 2012-03-21 煤炭科学研究总院西安研究院 Ground and underground three-dimensional extraction system of coal seam gas
CN102121364A (en) * 2011-02-14 2011-07-13 中国矿业大学 Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof
HU229944B1 (en) * 2011-05-30 2015-03-02 Sld Enhanced Recovery, Inc Method for ensuring of admission material into a bore hole
CN102213090B (en) * 2011-06-03 2014-08-06 中国科学院广州能源研究所 Method and device for exploiting natural gas hydrate in permafrost region
CN102852546B (en) * 2011-06-30 2015-04-29 河南煤业化工集团研究院有限责任公司 Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area
CN102352774A (en) * 2011-07-27 2012-02-15 焦作矿区计量检测中心 Method for controlling efficiency of drainage system by using flow rate of pipelines
RU2499142C2 (en) * 2011-09-02 2013-11-20 Михаил Владимирович Попов Method of degassing of unrelieved formations in underground mines
CN102400664B (en) * 2011-09-03 2012-12-26 中煤科工集团西安研究院 Well completion process method for increasing gas production of ground horizontally butted well of soft coal stratum
CN102383830B (en) * 2011-09-30 2014-12-24 中煤科工集团重庆研究院有限公司 Comprehensive outburst prevention method for outburst coal seam region
CN102352769A (en) * 2011-10-21 2012-02-15 河南煤业化工集团研究院有限责任公司 Integrated mining method for commonly mining coal and gas of high mine
CN102392678A (en) * 2011-10-21 2012-03-28 河南煤业化工集团研究院有限责任公司 Gas drainage method combining surface and underground fracturing and permeability improvement
CN103161439A (en) * 2011-12-09 2013-06-19 卫国 Horizontal segment updip well group
RU2485297C1 (en) * 2011-12-22 2013-06-20 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Development method of oil deposits by means of well interconnected through productive formation
CN102425397A (en) * 2011-12-29 2012-04-25 郑州大学 Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure
CN102518411A (en) * 2011-12-29 2012-06-27 郑州大学 Method for mining coal bed gas by hydraulic washout of butted well in manner of pressure relief
RU2499134C2 (en) * 2012-01-13 2013-11-20 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Method of development of oil pool located above gas pool and separated therefrom by impermeable parting
RU2503799C2 (en) * 2012-03-12 2014-01-10 Открытое Акционерное Общество "Газпром Промгаз" Method for shale gas production
CN102704908B (en) * 2012-05-14 2015-06-03 西南石油大学 Split-flow automatic control system of coal bed methane horizontal branch well and process thereof
US8919441B2 (en) 2012-07-03 2014-12-30 Halliburton Energy Services, Inc. Method of intersecting a first well bore by a second well bore
CN102852490A (en) * 2012-09-07 2013-01-02 北京九尊能源技术股份有限公司 High gas suction and discharge process method for complex well
CN103711457A (en) * 2012-09-29 2014-04-09 中国石油化工股份有限公司 Design method of six-spud-in wellbore structure
US9388668B2 (en) * 2012-11-23 2016-07-12 Robert Francis McAnally Subterranean channel for transporting a hydrocarbon for prevention of hydrates and provision of a relief well
CN103161440A (en) * 2013-02-27 2013-06-19 中联煤层气国家工程研究中心有限责任公司 Single-well coalbed methane horizontal well system and finishing method thereof
US9320989B2 (en) * 2013-03-15 2016-04-26 Haven Technology Solutions, LLC. Apparatus and method for gas-liquid separation
CN104141481B (en) * 2013-05-06 2016-09-07 中国石油天然气股份有限公司 A kind of ultra-low penetration compact oil reservoir horizontal well well-arranging procedure
CN103243777A (en) * 2013-05-17 2013-08-14 贵州能发高山矿业有限公司 Karst region mine water-exploring water-taking method and device
CN103291307B (en) * 2013-05-22 2015-08-05 中南大学 A kind of rich water rockhole Dewatering by leading level method
CN103670271B (en) * 2013-12-30 2016-03-09 中国石油集团渤海钻探工程有限公司 Two-way Cycle relay-type coal seam drilling method
CN103711473B (en) * 2013-12-30 2016-01-20 中国石油集团渤海钻探工程有限公司 Two-way Cycle relay-type coal seam compound well bores completion method
CN103742188B (en) * 2014-01-07 2016-08-17 中国神华能源股份有限公司 Colliery drawing-off gas well and boring method
CN103821554B (en) * 2014-03-07 2016-03-30 重庆大学 Based on the boring method for arranging without coal pillar mining Y type ventilation goaf
WO2015157812A1 (en) * 2014-04-14 2015-10-22 Peabody Energy Australia A multi purpose drilling system and method
RU2546704C1 (en) * 2014-04-15 2015-04-10 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Less explored oil deposit development method
CN103967472B (en) * 2014-05-26 2016-08-31 中煤科工集团西安研究院有限公司 A kind of coal bed gas staged fracturing horizontal well enhanced gas extraction method
CN104131831B (en) * 2014-06-12 2016-10-12 中国矿业大学 A kind of coal bed gas well three-dimensional associating pumping method up and down
CN103993827B (en) * 2014-06-12 2016-07-06 北京奥瑞安能源技术开发有限公司 Under balance pressure drilling method and system for coal bed gas
WO2016019427A1 (en) * 2014-08-04 2016-02-11 Leap Energy Australia Pty Ltd A well system
CN104329113B (en) * 2014-09-03 2016-10-05 安徽理工大学 A kind of method of surface drilling standing seat earth release mash gas extraction
CN104453832B (en) * 2014-10-30 2018-04-06 北京奥瑞安能源技术开发有限公司 A kind of multi-lateral horizontal well system and its construction method
CN104790951B (en) * 2015-03-12 2017-09-26 大同煤矿集团有限责任公司 Weaken the method and device away from the high-order tight roofs of 100 ~ 350m of coal seam
CN104806217B (en) * 2015-03-20 2017-03-22 河南理工大学 Combined separated layer fracturing, grouping and layer-combining mining method for coal bed well group
CN104695912A (en) * 2015-03-24 2015-06-10 山东齐天石油技术有限公司 Novel coal-bed methane mining equipment
CN104847263A (en) * 2015-04-30 2015-08-19 中煤科工集团西安研究院有限公司 Coal bed methane far-end butt joint horizontal well drilling method
US10036210B2 (en) * 2015-05-01 2018-07-31 Zilift Holdings, Ltd. Method and system for deploying an electrical submersible pump in a wellbore
CN104948108A (en) * 2015-05-30 2015-09-30 山西晋城无烟煤矿业集团有限责任公司 Hole drilling and poking technology of kilometer drilling machine for coal seam gas hole drilling
CN105003293A (en) * 2015-07-01 2015-10-28 西南石油大学 Gas drainage system for high-gas-content coal mine
CN104989330A (en) * 2015-08-03 2015-10-21 中国神华能源股份有限公司 Coalbed gas recovery method
CN105041370B (en) * 2015-08-24 2017-07-07 安徽理工大学 A kind of concordant hole pumping and mining coal-bed gas two-dimensional flow field method of testing
CN105156089A (en) * 2015-08-28 2015-12-16 中国神华能源股份有限公司 U-shaped well system and well drilling method thereof
CN105134213B (en) * 2015-09-10 2017-05-03 西南石油大学 Regional drilling and coal mining process method
CN105317456A (en) * 2015-11-16 2016-02-10 中国矿业大学 Gas extraction pipeline and method capable of preventing water accumulation and slag deposition
CN105649531B (en) * 2015-12-21 2017-12-05 中国石油天然气集团公司 One kind is without rig drilling equipment
CN105715227B (en) * 2016-01-26 2018-01-09 中国矿业大学 Self-sealing hydraulic pressure for up pressure measuring drill hole removes device and application method certainly
CN105888723B (en) * 2016-06-24 2018-04-10 安徽理工大学 Drainage arrangement from gas pressure measurement to layer-through drilling and method during a kind of lower
CN105937393B (en) * 2016-06-27 2022-11-04 中国石油天然气股份有限公司 Horizontal well dragging type liquid production profile testing pipe column and testing method thereof
CN106351687B (en) * 2016-10-31 2018-06-26 张培 A kind of convertible deslagging water drainage device of gas drainage pipeline
CN106555609B (en) * 2016-11-21 2017-08-08 西安科技大学 A kind of coal mine gob water, which is visited, puts method
CN106545296A (en) * 2016-12-02 2017-03-29 淮北矿业股份有限公司 A kind of surface drilling grouting treatment method of deep mining coal seam base plate limestone water damage
CN106869875B (en) * 2017-01-05 2019-06-07 中国神华能源股份有限公司 The method for exploiting two layers of coal bed gas
CN106677746A (en) * 2017-01-05 2017-05-17 中国神华能源股份有限公司 Method for coal bed gas exploitation of full working face through down-hole system
US10184297B2 (en) 2017-02-13 2019-01-22 Saudi Arabian Oil Company Drilling and operating sigmoid-shaped wells
CN107044270B (en) * 2017-04-05 2019-09-13 李卫忠 Coal mine leting speeper casing water-stopping method and sealing casing
CN107152261A (en) * 2017-05-10 2017-09-12 中国神华能源股份有限公司 Coal bed gas extraction system and method for construction
CN107313716B (en) * 2017-07-18 2023-05-09 山西晋城无烟煤矿业集团有限责任公司 Drilling method for coal-bed gas well crossing goaf by composite plugging broken rock at hole bottom
US11136875B2 (en) * 2017-07-27 2021-10-05 Saudi Arabian Oil Company Systems, apparatuses, and methods for downhole water separation
CN107288546B (en) * 2017-08-16 2019-05-03 北京奥瑞安能源技术开发有限公司 A kind of completion method and horizontal well of horizontal well
CN108590738A (en) * 2018-03-01 2018-09-28 王宇曜 Down-hole gas sucking releasing shaft construction method
CN110242209A (en) * 2018-03-09 2019-09-17 中国石油天然气股份有限公司 The boring method of producing well
CN108222890A (en) * 2018-03-09 2018-06-29 中国石油大学(华东) A kind of preset tubing string pneumatic type drainage gas production tool
CN108468566B (en) * 2018-03-26 2019-11-26 中煤科工集团西安研究院有限公司 Empty crystal really visits and puts method mine based on underground pencil directional drilling always
CN108798630B (en) * 2018-04-28 2021-09-28 中国矿业大学 Cave pressure relief mining simulation test system for tectonic coal in-situ coal bed gas horizontal well
CN108915766B (en) * 2018-07-10 2020-09-29 河北煤炭科学研究院 Method for exploring deep hidden water guide channel of working surface
CN109139011A (en) * 2018-08-02 2019-01-04 缪协兴 A kind of coal seam is the waterproof coal-mining method of Main aquifer
CN109057768A (en) * 2018-08-02 2018-12-21 四川盐业地质钻井大队 Recovery method suitable for thin interbed native soda deposit
CN109578058B (en) * 2018-12-10 2021-05-14 中国矿业大学 Method for improving gas extraction concentration of extraction borehole through auxiliary drilling
US10478753B1 (en) 2018-12-20 2019-11-19 CH International Equipment Ltd. Apparatus and method for treatment of hydraulic fracturing fluid during hydraulic fracturing
WO2020132328A1 (en) 2018-12-20 2020-06-25 Haven Technology Solutions Llc Apparatus and method for gas-liquid separation of multi-phase fluid
CN109403955B (en) * 2018-12-21 2022-03-22 中国电建集团贵阳勘测设计研究院有限公司 Device and method for measuring maximum horizontal stress direction in drill hole
CN110206099A (en) * 2019-06-14 2019-09-06 国家能源投资集团有限责任公司 Underground water system
CN110107263B (en) * 2019-06-20 2021-09-03 中联煤层气有限责任公司 Method for exploiting coal bed gas from tectonic coal reservoir
CN110185418B (en) * 2019-06-20 2022-04-19 中联煤层气有限责任公司 Coal bed gas mining method for coal bed group
CN110306934B (en) * 2019-07-02 2021-03-19 中煤科工集团西安研究院有限公司 Construction method for large-diameter high-position directional long drill hole of double-branch top plate
CN110439463A (en) * 2019-07-31 2019-11-12 江河水利水电咨询中心 Mined-out Area control injected hole pore-creating technique
CN110700878B (en) * 2019-10-24 2020-10-27 中煤科工集团西安研究院有限公司 Pumping screw pump drilling tool system for accumulated water in underground drilling hole of coal mine and construction method thereof
RU2730688C1 (en) * 2019-12-09 2020-08-25 Федеральное государственное бюджетное учреждение науки Институт горного дела им. Н.А. Чинакала Сибирского отделения Российской академии наук Method of directed hydraulic fracturing of coal bed
CN111058891B (en) * 2019-12-11 2021-06-04 煤炭科学技术研究院有限公司 Method for replacing and extracting coal seam gas in underground and aboveground modes
CN111236891A (en) * 2020-02-25 2020-06-05 神华神东煤炭集团有限责任公司 Coal bed gas extraction method
CN112240165B (en) * 2020-06-09 2022-10-25 冀中能源峰峰集团有限公司 Target layer position tracking method for exploration and treatment of water damage area of coal mine
CN111810085A (en) * 2020-06-12 2020-10-23 煤科集团沈阳研究院有限公司 Water jet drilling machine and coal seam feathery gas extraction drilling construction method
CN111810084A (en) * 2020-06-12 2020-10-23 煤科集团沈阳研究院有限公司 Coal bed mesh gas extraction drilling construction method of water jet drilling machine
CN111894672B (en) * 2020-08-14 2021-11-23 山东科技大学 Method for advanced treatment of roof separation water damage of stope by adopting ground drainage drilling
CN112196611B (en) * 2020-10-12 2022-07-12 重庆工程职业技术学院 Gas drainage water-vapor separation device
CN112211595B (en) * 2020-10-20 2022-05-06 吕梁学院 Construction method of coal-bed gas well at critical position
CN112211644B (en) * 2020-10-20 2022-04-05 吕梁学院 Method for guaranteeing coal roadway driving of soft coal seam containing gas coal roadway strip
CN112593911B (en) * 2020-12-14 2022-05-17 山西晋城无烟煤矿业集团有限责任公司 Coal mining and diameter expanding method by sectional power of horizontal well on coal mine ground
CN112593912B (en) * 2020-12-14 2022-05-17 山西晋城无烟煤矿业集团有限责任公司 Coal bed gas horizontal well power expanding, pressure relief and permeability increase extraction method
CN112832675A (en) * 2021-01-08 2021-05-25 南方科技大学台州研究院 Method for drilling small-aperture underground water monitoring well in gravel layer
CN112727542A (en) * 2021-01-12 2021-04-30 中国铁路设计集团有限公司 Underground water comprehensive utilization system for tunnel in water-rich area and use method
CN112796824B (en) * 2021-03-08 2022-05-17 吕梁学院 Slag discharging and water draining device for gas pipeline
CN113464121B (en) * 2021-05-12 2023-08-25 中煤科工集团西安研究院有限公司 Method for determining gamma geosteering drilling track of azimuth while drilling
CN113107591B (en) * 2021-05-15 2022-11-29 枣庄矿业集团新安煤业有限公司 Auxiliary drainage device for preventing and treating water in coal mine construction and drainage method thereof
CN113279687B (en) * 2021-06-07 2022-03-29 中国矿业大学 Water damage detection and treatment integrated treatment method for old goaf of riverside coal mine
WO2022261011A1 (en) * 2021-06-08 2022-12-15 Southwest Irrigation Llc Systems, methods and apparatus for mine slope extraction
CN113623005A (en) * 2021-09-06 2021-11-09 中煤科工集团沈阳研究院有限公司 Method for identifying mixed gas mined from coal seam groups
CN114320290B (en) * 2021-11-24 2023-08-11 中煤科工集团西安研究院有限公司 Full-hydraulic control system and control method for automatic rod-adding drilling machine for coal mine
CN114198141B (en) * 2022-02-16 2022-06-07 中煤昔阳能源有限责任公司白羊岭煤矿 Fully-mechanized coal mining face short borehole rapid pressure relief extraction method
CN114562331B (en) * 2022-03-03 2023-04-11 中煤科工集团西安研究院有限公司 Method for preventing and controlling old open water of integrated mine from being damaged by small kiln in same thick coal seam
CN114737928B (en) * 2022-06-13 2022-09-06 中煤科工集团西安研究院有限公司 Nuclear learning-based coalbed methane intelligent drainage and mining method and system
CN115450693B (en) * 2022-08-17 2023-07-14 中煤科工西安研究院(集团)有限公司 Large-drop deep-discharging method and system for steeply inclined aquifer
CN116104567B (en) * 2022-12-14 2023-07-18 中国矿业大学 Comprehensive treatment method for underground coal mine mud-carrying sand water burst

Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3347595A (en) * 1965-05-03 1967-10-17 Pittsburgh Plate Glass Co Establishing communication between bore holes in solution mining
US3934649A (en) * 1974-07-25 1976-01-27 The United States Of America As Represented By The United States Energy Research And Development Administration Method for removal of methane from coalbeds
US3961824A (en) * 1974-10-21 1976-06-08 Wouter Hugo Van Eek Method and system for winning minerals
US4037658A (en) * 1975-10-30 1977-07-26 Chevron Research Company Method of recovering viscous petroleum from an underground formation
US4089374A (en) * 1976-12-16 1978-05-16 In Situ Technology, Inc. Producing methane from coal in situ
US4220203A (en) * 1977-12-06 1980-09-02 Stamicarbon, B.V. Method for recovering coal in situ
US4299295A (en) * 1980-02-08 1981-11-10 Kerr-Mcgee Coal Corporation Process for degasification of subterranean mineral deposits
US4390067A (en) * 1981-04-06 1983-06-28 Exxon Production Research Co. Method of treating reservoirs containing very viscous crude oil or bitumen
US4442896A (en) * 1982-07-21 1984-04-17 Reale Lucio V Treatment of underground beds
US4532986A (en) * 1983-05-05 1985-08-06 Texaco Inc. Bitumen production and substrate stimulation with flow diverter means
US4544037A (en) * 1984-02-21 1985-10-01 In Situ Technology, Inc. Initiating production of methane from wet coal beds
US4702314A (en) * 1986-03-03 1987-10-27 Texaco Inc. Patterns of horizontal and vertical wells for improving oil recovery efficiency
US5016710A (en) * 1986-06-26 1991-05-21 Institut Francais Du Petrole Method of assisted production of an effluent to be produced contained in a geological formation
US5074360A (en) * 1990-07-10 1991-12-24 Guinn Jerry H Method for repoducing hydrocarbons from low-pressure reservoirs
US5246273A (en) * 1991-05-13 1993-09-21 Rosar Edward C Method and apparatus for solution mining
WO1994021889A2 (en) * 1993-03-17 1994-09-29 John North Improvements in or relating to drilling and to the extraction of fluids
US5411104A (en) * 1994-02-16 1995-05-02 Conoco Inc. Coalbed methane drilling
US5450902A (en) * 1993-05-14 1995-09-19 Matthews; Cameron M. Method and apparatus for producing and drilling a well
US5462116A (en) * 1994-10-26 1995-10-31 Carroll; Walter D. Method of producing methane gas from a coal seam
US5501279A (en) * 1995-01-12 1996-03-26 Amoco Corporation Apparatus and method for removing production-inhibiting liquid from a wellbore
US5501273A (en) * 1994-10-04 1996-03-26 Amoco Corporation Method for determining the reservoir properties of a solid carbonaceous subterranean formation
US5669444A (en) * 1996-01-31 1997-09-23 Vastar Resources, Inc. Chemically induced stimulation of coal cleat formation
DE19725996A1 (en) * 1996-06-19 1998-01-02 Robert R Talley Method for conveying water from vertical water borehole system
EP0819834A1 (en) * 1996-07-19 1998-01-21 Gaz De France (Service National) Method for making a cavity in a thin-walled salt mine
US5720356A (en) * 1996-02-01 1998-02-24 Gardes; Robert Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well
EP0875661A1 (en) * 1997-04-28 1998-11-04 Shell Internationale Researchmaatschappij B.V. Method for moving equipment in a well system
US5879057A (en) * 1996-11-12 1999-03-09 Amvest Corporation Horizontal remote mining system, and method
EP0952300A1 (en) * 1998-03-27 1999-10-27 Cooper Cameron Corporation Method and apparatus for drilling a plurality of offshore underwater wells

Family Cites Families (409)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US54144A (en) 1866-04-24 Improved mode of boring artesian wells
FR964503A (en) 1950-08-18
US526708A (en) 1894-10-02 Well-drilling apparatus
US274740A (en) 1883-03-27 douglass
US639036A (en) 1899-08-21 1899-12-12 Abner R Heald Expansion-drill.
US1189560A (en) 1914-10-21 1916-07-04 Georg Gondos Rotary drill.
US1285347A (en) 1918-02-09 1918-11-19 Albert Otto Reamer for oil and gas bearing sand.
US1485615A (en) 1920-12-08 1924-03-04 Arthur S Jones Oil-well reamer
US1467480A (en) 1921-12-19 1923-09-11 Petroleum Recovery Corp Well reamer
US1488106A (en) 1923-02-05 1924-03-25 Eagle Mfg Ass Intake for oil-well pumps
US1520737A (en) 1924-04-26 1924-12-30 Robert L Wright Method of increasing oil extraction from oil-bearing strata
US1777961A (en) 1927-04-04 1930-10-07 Capeliuschnicoff M Alcunovitch Bore-hole apparatus
US1674392A (en) 1927-08-06 1928-06-19 Flansburg Harold Apparatus for excavating postholes
GB442008A (en) 1934-07-23 1936-01-23 Leo Ranney Method of and apparatus for recovering water from or supplying water to subterraneanformations
GB444484A (en) 1934-09-17 1936-03-17 Leo Ranney Process of removing gas from coal and other carbonaceous materials in situ
US2018285A (en) 1934-11-27 1935-10-22 Schweitzer Reuben Richard Method of well development
US2069482A (en) 1935-04-18 1937-02-02 James I Seay Well reamer
US2150228A (en) 1936-08-31 1939-03-14 Luther F Lamb Packer
US2169718A (en) 1937-04-01 1939-08-15 Sprengund Tauchgesellschaft M Hydraulic earth-boring apparatus
US2335085A (en) 1941-03-18 1943-11-23 Colonnade Company Valve construction
US2490350A (en) 1943-12-15 1949-12-06 Claude C Taylor Means for centralizing casing and the like in a well
US2452654A (en) 1944-06-09 1948-11-02 Texaco Development Corp Method of graveling wells
US2450223A (en) 1944-11-25 1948-09-28 William R Barbour Well reaming apparatus
GB651468A (en) 1947-08-07 1951-04-04 Ranney Method Water Supplies I Improvements in and relating to the abstraction of water from water bearing strata
US2679903A (en) 1949-11-23 1954-06-01 Sid W Richardson Inc Means for installing and removing flow valves or the like
US2726847A (en) 1952-03-31 1955-12-13 Oilwell Drain Hole Drilling Co Drain hole drilling equipment
US2726063A (en) 1952-05-10 1955-12-06 Exxon Research Engineering Co Method of drilling wells
US2723063A (en) * 1952-06-03 1955-11-08 Carr Stanly Garment hanger
US2847189A (en) 1953-01-08 1958-08-12 Texas Co Apparatus for reaming holes drilled in the earth
US2780018A (en) 1953-03-11 1957-02-05 James R Bauserman Vehicle license tag and tab construction
US2797893A (en) 1954-09-13 1957-07-02 Oilwell Drain Hole Drilling Co Drilling and lining of drain holes
US2783018A (en) 1955-02-11 1957-02-26 Vac U Lift Company Valve means for suction lifting devices
US2934904A (en) 1955-09-01 1960-05-03 Phillips Petroleum Co Dual storage caverns
US2911008A (en) 1956-04-09 1959-11-03 Manning Maxwell & Moore Inc Fluid flow control device
US2868202A (en) * 1956-09-24 1959-01-13 Abe Okrend Infant feeding device
US2980142A (en) 1958-09-08 1961-04-18 Turak Anthony Plural dispensing valve
GB893869A (en) 1960-09-21 1962-04-18 Ranney Method International In Improvements in or relating to wells
US3208537A (en) 1960-12-08 1965-09-28 Reed Roller Bit Co Method of drilling
US3163211A (en) 1961-06-05 1964-12-29 Pan American Petroleum Corp Method of conducting reservoir pilot tests with a single well
US3135293A (en) 1962-08-28 1964-06-02 Robert L Erwin Rotary control valve
US3385382A (en) 1964-07-08 1968-05-28 Otis Eng Co Method and apparatus for transporting fluids
US3406766A (en) 1966-07-07 1968-10-22 Henderson John Keller Method and devices for interconnecting subterranean boreholes
FR1533221A (en) 1967-01-06 1968-07-19 Dba Sa Digitally Controlled Flow Valve
US3362475A (en) 1967-01-11 1968-01-09 Gulf Research Development Co Method of gravel packing a well and product formed thereby
US3443648A (en) 1967-09-13 1969-05-13 Fenix & Scisson Inc Earth formation underreamer
US3534822A (en) 1967-10-02 1970-10-20 Walker Neer Mfg Co Well circulating device
US3809519A (en) 1967-12-15 1974-05-07 Ici Ltd Injection moulding machines
US3578077A (en) 1968-05-27 1971-05-11 Mobil Oil Corp Flow control system and method
US3503377A (en) 1968-07-30 1970-03-31 Gen Motors Corp Control valve
US3528516A (en) 1968-08-21 1970-09-15 Cicero C Brown Expansible underreamer for drilling large diameter earth bores
US3530675A (en) 1968-08-26 1970-09-29 Lee A Turzillo Method and means for stabilizing structural layer overlying earth materials in situ
US3582138A (en) 1969-04-24 1971-06-01 Robert L Loofbourow Toroid excavation system
US3647230A (en) 1969-07-24 1972-03-07 William L Smedley Well pipe seal
US3587743A (en) 1970-03-17 1971-06-28 Pan American Petroleum Corp Explosively fracturing formations in wells
USRE32623E (en) * 1970-09-08 1988-03-15 Shell Oil Company Curved offshore well conductors
US3687204A (en) 1970-09-08 1972-08-29 Shell Oil Co Curved offshore well conductors
US3684041A (en) 1970-11-16 1972-08-15 Baker Oil Tools Inc Expansible rotary drill bit
US3692041A (en) 1971-01-04 1972-09-19 Gen Electric Variable flow distributor
US3681011A (en) 1971-01-19 1972-08-01 Us Army Cryo-coprecipitation method for production of ultrafine mixed metallic-oxide particles
US3744565A (en) 1971-01-22 1973-07-10 Cities Service Oil Co Apparatus and process for the solution and heating of sulfur containing natural gas
FI46651C (en) 1971-01-22 1973-05-08 Rinta Ways to drive water-soluble liquids and gases to a small extent.
US3757876A (en) 1971-09-01 1973-09-11 Smith International Drilling and belling apparatus
US3859328A (en) * 1971-11-03 1975-01-07 Pfizer 18 beta-glycyrrhetinic acid amides
US3757877A (en) 1971-12-30 1973-09-11 Grant Oil Tool Co Large diameter hole opener for earth boring
US3759328A (en) 1972-05-11 1973-09-18 Shell Oil Co Laterally expanding oil shale permeabilization
US3828867A (en) 1972-05-15 1974-08-13 A Elwood Low frequency drill bit apparatus and method of locating the position of the drill head below the surface of the earth
US3902322A (en) 1972-08-29 1975-09-02 Hikoitsu Watanabe Drain pipes for preventing landslides and method for driving the same
US3800830A (en) 1973-01-11 1974-04-02 B Etter Metering valve
US3825081A (en) 1973-03-08 1974-07-23 H Mcmahon Apparatus for slant hole directional drilling
US3874413A (en) 1973-04-09 1975-04-01 Vals Construction Multiported valve
US3907045A (en) 1973-11-30 1975-09-23 Continental Oil Co Guidance system for a horizontal drilling apparatus
US3887008A (en) 1974-03-21 1975-06-03 Charles L Canfield Downhole gas compression technique
US4022279A (en) * 1974-07-09 1977-05-10 Driver W B Formation conditioning process and system
US3957082A (en) 1974-09-26 1976-05-18 Arbrook, Inc. Six-way stopcock
SE386500B (en) 1974-11-25 1976-08-09 Sjumek Sjukvardsmek Hb GAS MIXTURE VALVE
US3952802A (en) * 1974-12-11 1976-04-27 In Situ Technology, Inc. Method and apparatus for in situ gasification of coal and the commercial products derived therefrom
SU750108A1 (en) * 1975-06-26 1980-07-23 Донецкий Ордена Трудового Красного Знамени Политехнический Институт Method of degassing coal bed satellites
US4037351A (en) 1975-12-15 1977-07-26 Springer Charles H Apparatus for attracting and electrocuting flies
US4020901A (en) 1976-01-19 1977-05-03 Chevron Research Company Arrangement for recovering viscous petroleum from thick tar sand
US4030310A (en) 1976-03-04 1977-06-21 Sea-Log Corporation Monopod drilling platform with directional drilling
US4137975A (en) 1976-05-13 1979-02-06 The British Petroleum Company Limited Drilling method
US4073351A (en) 1976-06-10 1978-02-14 Pei, Inc. Burners for flame jet drill
US4060130A (en) 1976-06-28 1977-11-29 Texaco Trinidad, Inc. Cleanout procedure for well with low bottom hole pressure
US4077481A (en) * 1976-07-12 1978-03-07 Fmc Corporation Subterranean mining apparatus
JPS5358105A (en) 1976-11-08 1978-05-25 Nippon Concrete Ind Co Ltd Method of generating supporting force for middle excavation system
US4136996A (en) 1977-05-23 1979-01-30 Texaco Development Corporation Directional drilling marine structure
US4134463A (en) 1977-06-22 1979-01-16 Smith International, Inc. Air lift system for large diameter borehole drilling
US4169510A (en) 1977-08-16 1979-10-02 Phillips Petroleum Company Drilling and belling apparatus
US4151880A (en) 1977-10-17 1979-05-01 Peabody Vann Vent assembly
US4160510A (en) 1978-01-30 1979-07-10 Rca Corporation CRT with tension band adapted for pusher-type tensioning and method for producing same
US4156437A (en) 1978-02-21 1979-05-29 The Perkin-Elmer Corporation Computer controllable multi-port valve
US4182423A (en) 1978-03-02 1980-01-08 Burton/Hawks Inc. Whipstock and method for directional well drilling
US4226475A (en) 1978-04-19 1980-10-07 Frosch Robert A Underground mineral extraction
NL7806559A (en) 1978-06-19 1979-12-21 Stamicarbon DEVICE FOR MINERAL EXTRACTION THROUGH A BOREHOLE.
US4221433A (en) 1978-07-20 1980-09-09 Occidental Minerals Corporation Retrogressively in-situ ore body chemical mining system and method
US4257650A (en) * 1978-09-07 1981-03-24 Barber Heavy Oil Process, Inc. Method for recovering subsurface earth substances
US4189184A (en) 1978-10-13 1980-02-19 Green Harold F Rotary drilling and extracting process
US4224989A (en) 1978-10-30 1980-09-30 Mobil Oil Corporation Method of dynamically killing a well blowout
FR2445483A1 (en) 1978-12-28 1980-07-25 Geostock SAFETY METHOD AND DEVICE FOR UNDERGROUND LIQUEFIED GAS STORAGE
US4366988A (en) 1979-02-16 1983-01-04 Bodine Albert G Sonic apparatus and method for slurry well bore mining and production
FR2452590A1 (en) 1979-03-27 1980-10-24 Snecma REMOVABLE SEAL FOR TURBOMACHINE DISPENSER SEGMENT
US4283088A (en) 1979-05-14 1981-08-11 Tabakov Vladimir P Thermal--mining method of oil production
US4296785A (en) 1979-07-09 1981-10-27 Mallinckrodt, Inc. System for generating and containerizing radioisotopes
US4222611A (en) 1979-08-16 1980-09-16 United States Of America As Represented By The Secretary Of The Interior In-situ leach mining method using branched single well for input and output
US4312377A (en) 1979-08-29 1982-01-26 Teledyne Adams, A Division Of Teledyne Isotopes, Inc. Tubular valve device and method of assembly
CA1140457A (en) 1979-10-19 1983-02-01 Noval Technologies Ltd. Method for recovering methane from coal seams
US4333539A (en) 1979-12-31 1982-06-08 Lyons William C Method for extended straight line drilling from a curved borehole
US4386665A (en) 1980-01-14 1983-06-07 Mobil Oil Corporation Drilling technique for providing multiple-pass penetration of a mineral-bearing formation
US4303127A (en) 1980-02-11 1981-12-01 Gulf Research & Development Company Multistage clean-up of product gas from underground coal gasification
SU876968A1 (en) 1980-02-18 1981-10-30 Всесоюзный Научно-Исследовательский Институт Использования Газов В Народном Хозяйстве И Подземного Хранения Нефти, Нефтепродуктов И Сжиженных Газов Method of communicating wells in formations of soluble rock
US4317492A (en) 1980-02-26 1982-03-02 The Curators Of The University Of Missouri Method and apparatus for drilling horizontal holes in geological structures from a vertical bore
US4296969A (en) 1980-04-11 1981-10-27 Exxon Production Research Company Thermal recovery of viscous hydrocarbons using arrays of radially spaced horizontal wells
US4328577A (en) 1980-06-03 1982-05-04 Rockwell International Corporation Muldem automatically adjusting to system expansion and contraction
US4372398A (en) 1980-11-04 1983-02-08 Cornell Research Foundation, Inc. Method of determining the location of a deep-well casing by magnetic field sensing
CH653741A5 (en) 1980-11-10 1986-01-15 Elektra Energy Ag Method of extracting crude oil from oil shale or oil sand
US4356866A (en) 1980-12-31 1982-11-02 Mobil Oil Corporation Process of underground coal gasification
JPS627747Y2 (en) 1981-03-17 1987-02-23
US4396076A (en) 1981-04-27 1983-08-02 Hachiro Inoue Under-reaming pile bore excavator
US4396075A (en) 1981-06-23 1983-08-02 Wood Edward T Multiple branch completion with common drilling and casing template
US4397360A (en) 1981-07-06 1983-08-09 Atlantic Richfield Company Method for forming drain holes from a cased well
US4415205A (en) 1981-07-10 1983-11-15 Rehm William A Triple branch completion with separate drilling and completion templates
US4437706A (en) 1981-08-03 1984-03-20 Gulf Canada Limited Hydraulic mining of tar sands with submerged jet erosion
US4401171A (en) 1981-12-10 1983-08-30 Dresser Industries, Inc. Underreamer with debris flushing flow path
US4422505A (en) * 1982-01-07 1983-12-27 Atlantic Richfield Company Method for gasifying subterranean coal deposits
US4444896A (en) 1982-05-05 1984-04-24 Exxon Research And Engineering Co. Reactivation of iridium-containing catalysts by halide pretreat and oxygen redispersion
US4527639A (en) 1982-07-26 1985-07-09 Bechtel National Corp. Hydraulic piston-effect method and apparatus for forming a bore hole
US4494010A (en) 1982-08-09 1985-01-15 Standum Controls, Inc. Programmable power control apparatus responsive to load variations
US4463988A (en) 1982-09-07 1984-08-07 Cities Service Co. Horizontal heated plane process
US4558744A (en) 1982-09-14 1985-12-17 Canocean Resources Ltd. Subsea caisson and method of installing same
US4452489A (en) * 1982-09-20 1984-06-05 Methane Drainage Ventures Multiple level methane drainage shaft method
US4458767A (en) 1982-09-28 1984-07-10 Mobil Oil Corporation Method for directionally drilling a first well to intersect a second well
US4715400A (en) 1983-03-09 1987-12-29 Xomox Corporation Valve and method of making same
JPS6058307A (en) 1983-03-18 1985-04-04 株式会社太洋商会 Molding automatic packing method of hanging section and device thereof
FR2545006B1 (en) 1983-04-27 1985-08-16 Mancel Patrick DEVICE FOR SPRAYING PRODUCTS, ESPECIALLY PAINTS
US4502733A (en) * 1983-06-08 1985-03-05 Tetra Systems, Inc. Oil mining configuration
US4512422A (en) 1983-06-28 1985-04-23 Rondel Knisley Apparatus for drilling oil and gas wells and a torque arrestor associated therewith
US4494616A (en) 1983-07-18 1985-01-22 Mckee George B Apparatus and methods for the aeration of cesspools
CA1210992A (en) 1983-07-28 1986-09-09 Quentin Siebold Off-vertical pumping unit
FR2551491B1 (en) 1983-08-31 1986-02-28 Elf Aquitaine MULTIDRAIN OIL DRILLING AND PRODUCTION DEVICE
FR2557195B1 (en) 1983-12-23 1986-05-02 Inst Francais Du Petrole METHOD FOR FORMING A FLUID BARRIER USING INCLINED DRAINS, ESPECIALLY IN AN OIL DEPOSIT
US5168042A (en) 1984-01-10 1992-12-01 Ly Uy Vu Instrumentless quantitative analysis system
US4565252A (en) 1984-03-08 1986-01-21 Lor, Inc. Borehole operating tool with fluid circulation through arms
US4519463A (en) * 1984-03-19 1985-05-28 Atlantic Richfield Company Drainhole drilling
US4605067A (en) 1984-03-26 1986-08-12 Rejane M. Burton Method and apparatus for completing well
US4600061A (en) * 1984-06-08 1986-07-15 Methane Drainage Ventures In-shaft drilling method for recovery of gas from subterranean formations
US4536035A (en) 1984-06-15 1985-08-20 The United States Of America As Represented By The United States Department Of Energy Hydraulic mining method
US4646836A (en) * 1984-08-03 1987-03-03 Hydril Company Tertiary recovery method using inverted deviated holes
US4605076A (en) * 1984-08-03 1986-08-12 Hydril Company Method for forming boreholes
US4533182A (en) 1984-08-03 1985-08-06 Methane Drainage Ventures Process for production of oil and gas through horizontal drainholes from underground workings
US4753485A (en) * 1984-08-03 1988-06-28 Hydril Company Solution mining
US4618009A (en) 1984-08-08 1986-10-21 Homco International Inc. Reaming tool
US4773488A (en) 1984-08-08 1988-09-27 Atlantic Richfield Company Development well drilling
US4599172A (en) 1984-12-24 1986-07-08 Gardes Robert A Flow line filter apparatus
US4674579A (en) 1985-03-07 1987-06-23 Flowmole Corporation Method and apparatus for installment of underground utilities
BE901892A (en) 1985-03-07 1985-07-01 Institution Pour Le Dev De La NEW PROCESS FOR CONTROLLED RETRACTION OF THE GAS-INJECTING INJECTION POINT IN SUBTERRANEAN COAL GASIFICATION SITES.
AU580813B2 (en) * 1985-05-17 1989-02-02 Methtec Incorporated. A method of mining coal and removing methane gas from an underground formation
GB2178088B (en) 1985-07-25 1988-11-09 Gearhart Tesel Ltd Improvements in downhole tools
US4676313A (en) 1985-10-30 1987-06-30 Rinaldi Roger E Controlled reservoir production
US4763734A (en) 1985-12-23 1988-08-16 Ben W. O. Dickinson Earth drilling method and apparatus using multiple hydraulic forces
US4651836A (en) * 1986-04-01 1987-03-24 Methane Drainage Ventures Process for recovering methane gas from subterranean coalseams
FR2596803B1 (en) 1986-04-02 1988-06-24 Elf Aquitaine SIMULTANEOUS DRILLING AND TUBING DEVICE
US4662440A (en) 1986-06-20 1987-05-05 Conoco Inc. Methods for obtaining well-to-well flow communication
US4754808A (en) 1986-06-20 1988-07-05 Conoco Inc. Methods for obtaining well-to-well flow communication
US4727937A (en) * 1986-10-02 1988-03-01 Texaco Inc. Steamflood process employing horizontal and vertical wells
US4718485A (en) * 1986-10-02 1988-01-12 Texaco Inc. Patterns having horizontal and vertical wells
US4754819A (en) 1987-03-11 1988-07-05 Mobil Oil Corporation Method for improving cuttings transport during the rotary drilling of a wellbore
SU1448078A1 (en) * 1987-03-25 1988-12-30 Московский Горный Институт Method of degassing a coal-rock mass portion
US4889186A (en) 1988-04-25 1989-12-26 Comdisco Resources, Inc. Overlapping horizontal fracture formation and flooding process
US4756367A (en) 1987-04-28 1988-07-12 Amoco Corporation Method for producing natural gas from a coal seam
US4889199A (en) 1987-05-27 1989-12-26 Lee Paul B Downhole valve for use when drilling an oil or gas well
US4776638A (en) * 1987-07-13 1988-10-11 University Of Kentucky Research Foundation Method and apparatus for conversion of coal in situ
US4842061A (en) 1988-02-05 1989-06-27 Vetco Gray Inc. Casing hanger packoff with C-shaped metal seal
US4830105A (en) 1988-02-08 1989-05-16 Atlantic Richfield Company Centralizer for wellbore apparatus
JPH01238236A (en) 1988-03-18 1989-09-22 Hitachi Ltd Optical subscriber transmitting system
US4852666A (en) 1988-04-07 1989-08-01 Brunet Charles G Apparatus for and a method of drilling offset wells for producing hydrocarbons
US4836611A (en) 1988-05-09 1989-06-06 Consolidation Coal Company Method and apparatus for drilling and separating
FR2632350B1 (en) 1988-06-03 1990-09-14 Inst Francais Du Petrole ASSISTED RECOVERY OF HEAVY HYDROCARBONS FROM A SUBTERRANEAN WELLBORE FORMATION HAVING A PORTION WITH SUBSTANTIALLY HORIZONTAL AREA
US4844182A (en) 1988-06-07 1989-07-04 Mobil Oil Corporation Method for improving drill cuttings transport from a wellbore
NO169399C (en) 1988-06-27 1992-06-17 Noco As DEVICE FOR DRILLING HOLES IN GROUND GROUPS
US4832122A (en) 1988-08-25 1989-05-23 The United States Of America As Represented By The United States Department Of Energy In-situ remediation system and method for contaminated groundwater
US5185133A (en) * 1988-08-23 1993-02-09 Gte Products Corporation Method for producing fine size yellow molybdenum trioxide powder
US4883122A (en) 1988-09-27 1989-11-28 Amoco Corporation Method of coalbed methane production
US4947935A (en) * 1989-07-14 1990-08-14 Marathon Oil Company Kill fluid for oil field operations
US5201617A (en) 1989-10-04 1993-04-13 Societe Nationale D'etude Et De Construction De Moteurs D'aviation S.N.E.C.M.A. Apparatus for supporting a machine tool on a robot arm
US4978172A (en) 1989-10-26 1990-12-18 Resource Enterprises, Inc. Gob methane drainage system
JP2692316B2 (en) 1989-11-20 1997-12-17 日本電気株式会社 Wavelength division optical switch
CA2009782A1 (en) 1990-02-12 1991-08-12 Anoosh I. Kiamanesh In-situ tuned microwave oil extraction process
US5035605A (en) 1990-02-16 1991-07-30 Cincinnati Milacron Inc. Nozzle shut-off valve for an injection molding machine
GB9003758D0 (en) 1990-02-20 1990-04-18 Shell Int Research Method and well system for producing hydrocarbons
NL9000426A (en) * 1990-02-22 1991-09-16 Maria Johanna Francien Voskamp METHOD AND SYSTEM FOR UNDERGROUND GASIFICATION OF STONE OR BROWN.
US5106710A (en) 1990-03-01 1992-04-21 Minnesota Mining And Manufacturing Company Receptor sheet for a toner developed electrostatic imaging process
JP2819042B2 (en) 1990-03-08 1998-10-30 株式会社小松製作所 Underground excavator position detector
SU1709076A1 (en) 1990-03-22 1992-01-30 Всесоюзный научно-исследовательский институт гидрогеологии и инженерной геологии Method of filtration well completion
US5033550A (en) 1990-04-16 1991-07-23 Otis Engineering Corporation Well production method
US5135058A (en) 1990-04-26 1992-08-04 Millgard Environmental Corporation Crane-mounted drill and method for in-situ treatment of contaminated soil
US5148877A (en) 1990-05-09 1992-09-22 Macgregor Donald C Apparatus for lateral drain hole drilling in oil and gas wells
US5194859A (en) 1990-06-15 1993-03-16 Amoco Corporation Apparatus and method for positioning a tool in a deviated section of a borehole
US5148875A (en) 1990-06-21 1992-09-22 Baker Hughes Incorporated Method and apparatus for horizontal drilling
US5074366A (en) 1990-06-21 1991-12-24 Baker Hughes Incorporated Method and apparatus for horizontal drilling
US5040601A (en) 1990-06-21 1991-08-20 Baker Hughes Incorporated Horizontal well bore system
US5036921A (en) 1990-06-28 1991-08-06 Slimdril International, Inc. Underreamer with sequentially expandable cutter blades
US5074365A (en) 1990-09-14 1991-12-24 Vector Magnetics, Inc. Borehole guidance system having target wireline
US5115872A (en) 1990-10-19 1992-05-26 Anglo Suisse, Inc. Directional drilling system and method for drilling precise offset wellbores from a main wellbore
US5217076A (en) * 1990-12-04 1993-06-08 Masek John A Method and apparatus for improved recovery of oil from porous, subsurface deposits (targevcir oricess)
CA2066912C (en) 1991-04-24 1997-04-01 Ketankumar K. Sheth Submersible well pump gas separator
US5165491A (en) 1991-04-29 1992-11-24 Prideco, Inc. Method of horizontal drilling
US5197783A (en) 1991-04-29 1993-03-30 Esso Resources Canada Ltd. Extendable/erectable arm assembly and method of borehole mining
US5664911A (en) 1991-05-03 1997-09-09 Iit Research Institute Method and apparatus for in situ decontamination of a site contaminated with a volatile material
US5193620A (en) 1991-08-05 1993-03-16 Tiw Corporation Whipstock setting method and apparatus
US5271472A (en) 1991-08-14 1993-12-21 Atlantic Richfield Company Drilling with casing and retrievable drill bit
US5197553A (en) 1991-08-14 1993-03-30 Atlantic Richfield Company Drilling with casing and retrievable drill bit
US5174374A (en) 1991-10-17 1992-12-29 Hailey Charles D Clean-out tool cutting blade
US5199496A (en) 1991-10-18 1993-04-06 Texaco, Inc. Subsea pumping device incorporating a wellhead aspirator
US5168942A (en) 1991-10-21 1992-12-08 Atlantic Richfield Company Resistivity measurement system for drilling with casing
US5207271A (en) 1991-10-30 1993-05-04 Mobil Oil Corporation Foam/steam injection into a horizontal wellbore for multiple fracture creation
US5255741A (en) 1991-12-11 1993-10-26 Mobil Oil Corporation Process and apparatus for completing a well in an unconsolidated formation
US5242017A (en) 1991-12-27 1993-09-07 Hailey Charles D Cutter blades for rotary tubing tools
US5201817A (en) 1991-12-27 1993-04-13 Hailey Charles D Downhole cutting tool
US5226495A (en) 1992-05-18 1993-07-13 Mobil Oil Corporation Fines control in deviated wells
US5289888A (en) * 1992-05-26 1994-03-01 Rrkt Company Water well completion method
FR2692315B1 (en) 1992-06-12 1994-09-02 Inst Francais Du Petrole System and method for drilling and equipping a lateral well, application to the exploitation of oil fields.
US5242025A (en) 1992-06-30 1993-09-07 Union Oil Company Of California Guided oscillatory well path drilling by seismic imaging
GB2297988B (en) 1992-08-07 1997-01-22 Baker Hughes Inc Method & apparatus for locating & re-entering one or more horizontal wells using whipstocks
US5474131A (en) 1992-08-07 1995-12-12 Baker Hughes Incorporated Method for completing multi-lateral wells and maintaining selective re-entry into laterals
US5477923A (en) 1992-08-07 1995-12-26 Baker Hughes Incorporated Wellbore completion using measurement-while-drilling techniques
US5655602A (en) * 1992-08-28 1997-08-12 Marathon Oil Company Apparatus and process for drilling and completing multiple wells
US5301760C1 (en) 1992-09-10 2002-06-11 Natural Reserve Group Inc Completing horizontal drain holes from a vertical well
US5343965A (en) 1992-10-19 1994-09-06 Talley Robert R Apparatus and methods for horizontal completion of a water well
US5355967A (en) * 1992-10-30 1994-10-18 Union Oil Company Of California Underbalance jet pump drilling method
US5485089A (en) 1992-11-06 1996-01-16 Vector Magnetics, Inc. Method and apparatus for measuring distance and direction by movable magnetic field source
US5462120A (en) 1993-01-04 1995-10-31 S-Cal Research Corp. Downhole equipment, tools and assembly procedures for the drilling, tie-in and completion of vertical cased oil wells connected to liner-equipped multiple drainholes
US5469155A (en) 1993-01-27 1995-11-21 Mclaughlin Manufacturing Company, Inc. Wireless remote boring apparatus guidance system
FR2703407B1 (en) 1993-03-29 1995-05-12 Inst Francais Du Petrole Pumping device and method comprising two suction inlets applied to a subhorizontal drain.
US5402851A (en) 1993-05-03 1995-04-04 Baiton; Nick Horizontal drilling method for hydrocarbon recovery
US5394950A (en) 1993-05-21 1995-03-07 Gardes; Robert A. Method of drilling multiple radial wells using multiple string downhole orientation
DE4323580C1 (en) * 1993-07-14 1995-03-23 Elias Lebessis Tear tool
US5411088A (en) 1993-08-06 1995-05-02 Baker Hughes Incorporated Filter with gas separator for electric setting tool
US6209636B1 (en) * 1993-09-10 2001-04-03 Weatherford/Lamb, Inc. Wellbore primary barrier and related systems
US5727629A (en) 1996-01-24 1998-03-17 Weatherford/Lamb, Inc. Wellbore milling guide and method
US5363927A (en) 1993-09-27 1994-11-15 Frank Robert C Apparatus and method for hydraulic drilling
US5853056A (en) 1993-10-01 1998-12-29 Landers; Carl W. Method of and apparatus for horizontal well drilling
US5385205A (en) 1993-10-04 1995-01-31 Hailey; Charles D. Dual mode rotary cutting tool
US5431482A (en) * 1993-10-13 1995-07-11 Sandia Corporation Horizontal natural gas storage caverns and methods for producing same
US5501173A (en) 1993-10-18 1996-03-26 Westinghouse Electric Corporation Method for epitaxially growing α-silicon carbide on a-axis α-silicon carbide substrates
US5411085A (en) 1993-11-01 1995-05-02 Camco International Inc. Spoolable coiled tubing completion system
US5411082A (en) 1994-01-26 1995-05-02 Baker Hughes Incorporated Scoophead running tool
US5454410A (en) 1994-03-15 1995-10-03 Edfors; John E. Apparatus for rough-splitting planks
US5431220A (en) 1994-03-24 1995-07-11 Smith International, Inc. Whipstock starter mill assembly
US5658347A (en) 1994-04-25 1997-08-19 Sarkisian; James S. Acetabular cup with keel
US5494121A (en) 1994-04-28 1996-02-27 Nackerud; Alan L. Cavern well completion method and apparatus
US5435400B1 (en) * 1994-05-25 1999-06-01 Atlantic Richfield Co Lateral well drilling
ZA954157B (en) 1994-05-27 1996-04-15 Seec Inc Method for recycling carbon dioxide for enhancing plant growth
US5411105A (en) 1994-06-14 1995-05-02 Kidco Resources Ltd. Drilling a well gas supply in the drilling liquid
US5733067A (en) 1994-07-11 1998-03-31 Foremost Solutions, Inc Method and system for bioremediation of contaminated soil using inoculated support spheres
US5564503A (en) 1994-08-26 1996-10-15 Halliburton Company Methods and systems for subterranean multilateral well drilling and completion
US5454419A (en) 1994-09-19 1995-10-03 Polybore, Inc. Method for lining a casing
US5540282A (en) 1994-10-21 1996-07-30 Dallas; L. Murray Apparatus and method for completing/recompleting production wells
GB2308608B (en) 1994-10-31 1998-11-18 Red Baron The 2-stage underreamer
US5659347A (en) 1994-11-14 1997-08-19 Xerox Corporation Ink supply apparatus
US5613242A (en) * 1994-12-06 1997-03-18 Oddo; John E. Method and system for disposing of radioactive solid waste
US5586609A (en) * 1994-12-15 1996-12-24 Telejet Technologies, Inc. Method and apparatus for drilling with high-pressure, reduced solid content liquid
US5852505A (en) 1994-12-28 1998-12-22 Lucent Technologies Inc. Dense waveguide division multiplexers implemented using a first stage fourier filter
US5732776A (en) * 1995-02-09 1998-03-31 Baker Hughes Incorporated Downhole production well control system and method
GB9505652D0 (en) 1995-03-21 1995-05-10 Radiodetection Ltd Locating objects
US5868210A (en) * 1995-03-27 1999-02-09 Baker Hughes Incorporated Multi-lateral wellbore systems and methods for forming same
US6581455B1 (en) 1995-03-31 2003-06-24 Baker Hughes Incorporated Modified formation testing apparatus with borehole grippers and method of formation testing
US5653286A (en) 1995-05-12 1997-08-05 Mccoy; James N. Downhole gas separator
CN1062330C (en) * 1995-05-25 2001-02-21 中国矿业大学 Propulsion air-feeding type coal underground gasifying furnace
US5584605A (en) 1995-06-29 1996-12-17 Beard; Barry C. Enhanced in situ hydrocarbon removal from soil and groundwater
CN2248254Y (en) 1995-08-09 1997-02-26 封长旺 Soft-axis deep well pump
US5706871A (en) 1995-08-15 1998-01-13 Dresser Industries, Inc. Fluid control apparatus and method
BR9610373A (en) 1995-08-22 1999-12-21 Western Well Toll Inc Traction-thrust hole tool
US5785133A (en) 1995-08-29 1998-07-28 Tiw Corporation Multiple lateral hydrocarbon recovery system and method
US5697445A (en) 1995-09-27 1997-12-16 Natural Reserves Group, Inc. Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means
JPH09116492A (en) 1995-10-18 1997-05-02 Nec Corp Wavelength multiplex light amplifying/repeating method/ device
AUPN703195A0 (en) 1995-12-08 1996-01-04 Bhp Australia Coal Pty Ltd Fluid drilling system
US5680901A (en) 1995-12-14 1997-10-28 Gardes; Robert Radial tie back assembly for directional drilling
US5914798A (en) 1995-12-29 1999-06-22 Mci Communications Corporation Restoration systems for an optical telecommunications network
US5941308A (en) 1996-01-26 1999-08-24 Schlumberger Technology Corporation Flow segregator for multi-drain well completion
US6457540B2 (en) 1996-02-01 2002-10-01 Robert Gardes Method and system for hydraulic friction controlled drilling and completing geopressured wells utilizing concentric drill strings
US7185718B2 (en) 1996-02-01 2007-03-06 Robert Gardes Method and system for hydraulic friction controlled drilling and completing geopressured wells utilizing concentric drill strings
US6065550A (en) 1996-02-01 2000-05-23 Gardes; Robert Method and system for drilling and completing underbalanced multilateral wells utilizing a dual string technique in a live well
US6283216B1 (en) 1996-03-11 2001-09-04 Schlumberger Technology Corporation Apparatus and method for establishing branch wells from a parent well
US6056059A (en) 1996-03-11 2000-05-02 Schlumberger Technology Corporation Apparatus and method for establishing branch wells from a parent well
US5944107A (en) * 1996-03-11 1999-08-31 Schlumberger Technology Corporation Method and apparatus for establishing branch wells at a node of a parent well
US6564867B2 (en) 1996-03-13 2003-05-20 Schlumberger Technology Corporation Method and apparatus for cementing branch wells from a parent well
US5775433A (en) 1996-04-03 1998-07-07 Halliburton Company Coiled tubing pulling tool
US5690390A (en) 1996-04-19 1997-11-25 Fmc Corporation Process for solution mining underground evaporite ore formations such as trona
GB2347158B (en) 1996-05-01 2000-11-22 Baker Hughes Inc Methods of recovering hydrocarbons from a producing zone
US6547006B1 (en) * 1996-05-02 2003-04-15 Weatherford/Lamb, Inc. Wellbore liner system
US5676207A (en) 1996-05-20 1997-10-14 Simon; Philip B. Soil vapor extraction system
US5957539A (en) 1996-07-19 1999-09-28 Gaz De France (G.D.F.) Service National Process for excavating a cavity in a thin salt layer
AU4149397A (en) * 1996-08-30 1998-03-19 Camco International, Inc. Method and apparatus to seal a junction between a lateral and a main wellbore
AU4819797A (en) 1996-10-08 1998-05-05 Baker Hughes Incorporated A method of forming and servicing wellbores from a main wellbore
US6012520A (en) 1996-10-11 2000-01-11 Yu; Andrew Hydrocarbon recovery methods by creating high-permeability webs
US5775443A (en) 1996-10-15 1998-07-07 Nozzle Technology, Inc. Jet pump drilling apparatus and method
US6089322A (en) 1996-12-02 2000-07-18 Kelley & Sons Group International, Inc. Method and apparatus for increasing fluid recovery from a subterranean formation
US5867289A (en) 1996-12-24 1999-02-02 International Business Machines Corporation Fault detection for all-optical add-drop multiplexer
RU2097536C1 (en) 1997-01-05 1997-11-27 Открытое акционерное общество "Удмуртнефть" Method of developing irregular multiple-zone oil deposit
US5853224A (en) 1997-01-22 1998-12-29 Vastar Resources, Inc. Method for completing a well in a coal formation
US5863283A (en) * 1997-02-10 1999-01-26 Gardes; Robert System and process for disposing of nuclear and other hazardous wastes in boreholes
US5871260A (en) 1997-02-11 1999-02-16 Delli-Gatti, Jr.; Frank A. Mining ultra thin coal seams
US5845710A (en) 1997-02-13 1998-12-08 Halliburton Energy Services, Inc. Methods of completing a subterranean well
US5884704A (en) 1997-02-13 1999-03-23 Halliburton Energy Services, Inc. Methods of completing a subterranean well and associated apparatus
US5938004A (en) 1997-02-14 1999-08-17 Consol, Inc. Method of providing temporary support for an extended conveyor belt
US6019173A (en) * 1997-04-04 2000-02-01 Dresser Industries, Inc. Multilateral whipstock and tools for installing and retrieving
US6030048A (en) * 1997-05-07 2000-02-29 Tarim Associates For Scientific Mineral And Oil Exploration Ag. In-situ chemical reactor for recovery of metals or purification of salts
US20020043404A1 (en) * 1997-06-06 2002-04-18 Robert Trueman Erectable arm assembly for use in boreholes
US5832958A (en) 1997-09-04 1998-11-10 Cheng; Tsan-Hsiung Faucet
TW411471B (en) 1997-09-17 2000-11-11 Siemens Ag Memory-cell device
US5868202A (en) 1997-09-22 1999-02-09 Tarim Associates For Scientific Mineral And Oil Exploration Ag Hydrologic cells for recovery of hydrocarbons or thermal energy from coal, oil-shale, tar-sands and oil-bearing formations
US6244340B1 (en) 1997-09-24 2001-06-12 Halliburton Energy Services, Inc. Self-locating reentry system for downhole well completions
US6050335A (en) 1997-10-31 2000-04-18 Shell Oil Company In-situ production of bitumen
US5988278A (en) 1997-12-02 1999-11-23 Atlantic Richfield Company Using a horizontal circular wellbore to improve oil recovery
US5934390A (en) 1997-12-23 1999-08-10 Uthe; Michael Horizontal drilling for oil recovery
US6119771A (en) 1998-01-27 2000-09-19 Halliburton Energy Services, Inc. Sealed lateral wellbore junction assembled downhole
US6062306A (en) 1998-01-27 2000-05-16 Halliburton Energy Services, Inc. Sealed lateral wellbore junction assembled downhole
US6119776A (en) 1998-02-12 2000-09-19 Halliburton Energy Services, Inc. Methods of stimulating and producing multiple stratified reservoirs
US6024171A (en) * 1998-03-12 2000-02-15 Vastar Resources, Inc. Method for stimulating a wellbore penetrating a solid carbonaceous subterranean formation
US6065551A (en) 1998-04-17 2000-05-23 G & G Gas, Inc. Method and apparatus for rotary mining
US6263965B1 (en) 1998-05-27 2001-07-24 Tecmark International Multiple drain method for recovering oil from tar sand
US6135208A (en) 1998-05-28 2000-10-24 Halliburton Energy Services, Inc. Expandable wellbore junction
US6244338B1 (en) 1998-06-23 2001-06-12 The University Of Wyoming Research Corp., System for improving coalbed gas production
US6179054B1 (en) * 1998-07-31 2001-01-30 Robert G Stewart Down hole gas separator
RU2136566C1 (en) 1998-08-07 1999-09-10 Предприятие "Кубаньгазпром" Method of building and operation of underground gas storage in sandwich-type nonuniform low penetration slightly cemented terrigenous reservoirs with underlaying water-bearing stratum
GB2342670B (en) * 1998-09-28 2003-03-26 Camco Int High gas/liquid ratio electric submergible pumping system utilizing a jet pump
US6892816B2 (en) 1998-11-17 2005-05-17 Schlumberger Technology Corporation Method and apparatus for selective injection or flow control with through-tubing operation capacity
US7048049B2 (en) 2001-10-30 2006-05-23 Cdx Gas, Llc Slant entry well system and method
US6454000B1 (en) 1999-11-19 2002-09-24 Cdx Gas, Llc Cavity well positioning system and method
US7025154B2 (en) * 1998-11-20 2006-04-11 Cdx Gas, Llc Method and system for circulating fluid in a well system
US8376052B2 (en) 1998-11-20 2013-02-19 Vitruvian Exploration, Llc Method and system for surface production of gas from a subterranean zone
US6988548B2 (en) * 2002-10-03 2006-01-24 Cdx Gas, Llc Method and system for removing fluid from a subterranean zone using an enlarged cavity
US20040035582A1 (en) * 2002-08-22 2004-02-26 Zupanick Joseph A. System and method for subterranean access
US6425448B1 (en) 2001-01-30 2002-07-30 Cdx Gas, L.L.P. Method and system for accessing subterranean zones from a limited surface area
US6662870B1 (en) * 2001-01-30 2003-12-16 Cdx Gas, L.L.C. Method and system for accessing subterranean deposits from a limited surface area
US6681855B2 (en) * 2001-10-19 2004-01-27 Cdx Gas, L.L.C. Method and system for management of by-products from subterranean zones
US8297377B2 (en) 1998-11-20 2012-10-30 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
US6280000B1 (en) * 1998-11-20 2001-08-28 Joseph A. Zupanick Method for production of gas from a coal seam using intersecting well bores
US6679322B1 (en) * 1998-11-20 2004-01-20 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
US6708764B2 (en) * 2002-07-12 2004-03-23 Cdx Gas, L.L.C. Undulating well bore
US6598686B1 (en) 1998-11-20 2003-07-29 Cdx Gas, Llc Method and system for enhanced access to a subterranean zone
US7073595B2 (en) 2002-09-12 2006-07-11 Cdx Gas, Llc Method and system for controlling pressure in a dual well system
US6250391B1 (en) * 1999-01-29 2001-06-26 Glenn C. Proudfoot Producing hydrocarbons from well with underground reservoir
MY120832A (en) 1999-02-01 2005-11-30 Shell Int Research Multilateral well and electrical transmission system
RU2176311C2 (en) 1999-08-16 2001-11-27 ОАО "Томскгазпром" Method of development of gas condensate-oil deposit
DE19939262C1 (en) 1999-08-19 2000-11-09 Becfield Drilling Services Gmb Borehole measuring device uses stator and cooperating rotor for providing coded pressure pulses for transmission of measured values to surface via borehole rinsing fluid
US6199633B1 (en) * 1999-08-27 2001-03-13 James R. Longbottom Method and apparatus for intersecting downhole wellbore casings
US6223839B1 (en) 1999-08-30 2001-05-01 Phillips Petroleum Company Hydraulic underreamer and sections for use therein
US7096976B2 (en) 1999-11-05 2006-08-29 Halliburton Energy Services, Inc. Drilling formation tester, apparatus and methods of testing and monitoring status of tester
WO2001044620A1 (en) 1999-12-14 2001-06-21 Shell Internationale Research Maatschappij B.V. System for producing de-watered oil
UA37720A (en) 2000-04-07 2001-05-15 Інститут геотехнічної механіки НАН України Method for degassing extraction section of mine
NO312312B1 (en) 2000-05-03 2002-04-22 Psl Pipeline Process Excavatio Device by well pump
CN1451075A (en) 2000-05-16 2003-10-22 奥梅加石油公司 Method and apparatus for hydrocarbon subterranean recovery
RU2179234C1 (en) 2000-05-19 2002-02-10 Открытое акционерное общество "Татнефть" Татарский научно-исследовательский и проектный институт нефти "ТатНИПИнефть" Method of developing water-flooded oil pool
US6590202B2 (en) 2000-05-26 2003-07-08 Precision Drilling Technology Services Group Inc. Standoff compensation for nuclear measurements
US6566649B1 (en) 2000-05-26 2003-05-20 Precision Drilling Technology Services Group Inc. Standoff compensation for nuclear measurements
US20020023754A1 (en) 2000-08-28 2002-02-28 Buytaert Jean P. Method for drilling multilateral wells and related device
US6561277B2 (en) 2000-10-13 2003-05-13 Schlumberger Technology Corporation Flow control in multilateral wells
AU2002224445A1 (en) * 2000-10-26 2002-05-06 Joe E. Guyer Method of generating and recovering gas from subsurface formations of coal, carbonaceous shale and organic-rich shales
US6457525B1 (en) 2000-12-15 2002-10-01 Exxonmobil Oil Corporation Method and apparatus for completing multiple production zones from a single wellbore
US7243738B2 (en) 2001-01-29 2007-07-17 Robert Gardes Multi seam coal bed/methane dewatering and depressurizing production system
US6923275B2 (en) 2001-01-29 2005-08-02 Robert Gardes Multi seam coal bed/methane dewatering and depressurizing production system
US6639210B2 (en) 2001-03-14 2003-10-28 Computalog U.S.A., Inc. Geometrically optimized fast neutron detector
CA2344627C (en) 2001-04-18 2007-08-07 Northland Energy Corporation Method of dynamically controlling bottom hole circulating pressure in a wellbore
GB2379508B (en) 2001-04-23 2005-06-08 Computalog Usa Inc Electrical measurement apparatus and method
US6604910B1 (en) 2001-04-24 2003-08-12 Cdx Gas, Llc Fluid controlled pumping system and method
US6497556B2 (en) 2001-04-24 2002-12-24 Cdx Gas, Llc Fluid level control for a downhole well pumping system
US6571888B2 (en) 2001-05-14 2003-06-03 Precision Drilling Technology Services Group, Inc. Apparatus and method for directional drilling with coiled tubing
US6575255B1 (en) 2001-08-13 2003-06-10 Cdx Gas, Llc Pantograph underreamer
US6644422B1 (en) 2001-08-13 2003-11-11 Cdx Gas, L.L.C. Pantograph underreamer
US6591922B1 (en) 2001-08-13 2003-07-15 Cdx Gas, Llc Pantograph underreamer and method for forming a well bore cavity
US6595302B1 (en) 2001-08-17 2003-07-22 Cdx Gas, Llc Multi-blade underreamer
US6595301B1 (en) 2001-08-17 2003-07-22 Cdx Gas, Llc Single-blade underreamer
RU2205935C1 (en) 2001-09-20 2003-06-10 Общество с ограниченной ответственностью "ТюменНИИгипрогаз" Method of multiple hole construction
US6581685B2 (en) 2001-09-25 2003-06-24 Schlumberger Technology Corporation Method for determining formation characteristics in a perforated wellbore
US6962030B2 (en) * 2001-10-04 2005-11-08 Pd International Services, Inc. Method and apparatus for interconnected, rolling rig and oilfield building(s)
US6585061B2 (en) 2001-10-15 2003-07-01 Precision Drilling Technology Services Group, Inc. Calculating directional drilling tool face offsets
US6591903B2 (en) 2001-12-06 2003-07-15 Eog Resources Inc. Method of recovery of hydrocarbons from low pressure formations
US6577129B1 (en) 2002-01-19 2003-06-10 Precision Drilling Technology Services Group Inc. Well logging system for determining directional resistivity using multiple transmitter-receiver groups focused with magnetic reluctance material
US6646441B2 (en) 2002-01-19 2003-11-11 Precision Drilling Technology Services Group Inc. Well logging system for determining resistivity using multiple transmitter-receiver groups operating at three frequencies
US6722452B1 (en) * 2002-02-19 2004-04-20 Cdx Gas, Llc Pantograph underreamer
US6968893B2 (en) * 2002-04-03 2005-11-29 Target Drilling Inc. Method and system for production of gas and water from a gas bearing strata during drilling and after drilling completion
US7360595B2 (en) 2002-05-08 2008-04-22 Cdx Gas, Llc Method and system for underground treatment of materials
US6725922B2 (en) 2002-07-12 2004-04-27 Cdx Gas, Llc Ramping well bores
US6991047B2 (en) * 2002-07-12 2006-01-31 Cdx Gas, Llc Wellbore sealing system and method
US6991048B2 (en) * 2002-07-12 2006-01-31 Cdx Gas, Llc Wellbore plug system and method
US6976547B2 (en) * 2002-07-16 2005-12-20 Cdx Gas, Llc Actuator underreamer
US6851479B1 (en) * 2002-07-17 2005-02-08 Cdx Gas, Llc Cavity positioning tool and method
US7025137B2 (en) 2002-09-12 2006-04-11 Cdx Gas, Llc Three-dimensional well system for accessing subterranean zones
US8333245B2 (en) * 2002-09-17 2012-12-18 Vitruvian Exploration, Llc Accelerated production of gas from a subterranean zone
US6860147B2 (en) * 2002-09-30 2005-03-01 Alberta Research Council Inc. Process for predicting porosity and permeability of a coal bed
US6964308B1 (en) 2002-10-08 2005-11-15 Cdx Gas, Llc Method of drilling lateral wellbores from a slant well without utilizing a whipstock
AU2002952176A0 (en) 2002-10-18 2002-10-31 Cmte Development Limited Drill head steering
US6953088B2 (en) 2002-12-23 2005-10-11 Cdx Gas, Llc Method and system for controlling the production rate of fluid from a subterranean zone to maintain production bore stability in the zone
US7264048B2 (en) 2003-04-21 2007-09-04 Cdx Gas, Llc Slot cavity
US6932168B2 (en) 2003-05-15 2005-08-23 Cnx Gas Company, Llc Method for making a well for removing fluid from a desired subterranean formation
US7134494B2 (en) 2003-06-05 2006-11-14 Cdx Gas, Llc Method and system for recirculating fluid in a well system
AU2003244819A1 (en) 2003-06-30 2005-01-21 Petroleo Brasileiro S A-Petrobras Method for, and the construction of, a long-distance well for the production, transport, storage and exploitation of mineral layers and fluids
US7100687B2 (en) 2003-11-17 2006-09-05 Cdx Gas, Llc Multi-purpose well bores and method for accessing a subterranean zone from the surface
US7163063B2 (en) 2003-11-26 2007-01-16 Cdx Gas, Llc Method and system for extraction of resources from a subterranean well bore
US7207395B2 (en) 2004-01-30 2007-04-24 Cdx Gas, Llc Method and system for testing a partially formed hydrocarbon well for evaluation and well planning refinement
US7222670B2 (en) 2004-02-27 2007-05-29 Cdx Gas, Llc System and method for multiple wells from a common surface location
US7178611B2 (en) 2004-03-25 2007-02-20 Cdx Gas, Llc System and method for directional drilling utilizing clutch assembly
US7370701B2 (en) * 2004-06-30 2008-05-13 Halliburton Energy Services, Inc. Wellbore completion design to naturally separate water and solids from oil and gas
US7387165B2 (en) 2004-12-14 2008-06-17 Schlumberger Technology Corporation System for completing multiple well intervals
US7571771B2 (en) 2005-05-31 2009-08-11 Cdx Gas, Llc Cavity well system
US7543648B2 (en) 2006-11-02 2009-06-09 Schlumberger Technology Corporation System and method utilizing a compliant well screen
US20080149349A1 (en) 2006-12-20 2008-06-26 Stephane Hiron Integrated flow control device and isolation element
US7673676B2 (en) * 2007-04-04 2010-03-09 Schlumberger Technology Corporation Electric submersible pumping system with gas vent

Patent Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3347595A (en) * 1965-05-03 1967-10-17 Pittsburgh Plate Glass Co Establishing communication between bore holes in solution mining
US3934649A (en) * 1974-07-25 1976-01-27 The United States Of America As Represented By The United States Energy Research And Development Administration Method for removal of methane from coalbeds
US3961824A (en) * 1974-10-21 1976-06-08 Wouter Hugo Van Eek Method and system for winning minerals
US4037658A (en) * 1975-10-30 1977-07-26 Chevron Research Company Method of recovering viscous petroleum from an underground formation
US4089374A (en) * 1976-12-16 1978-05-16 In Situ Technology, Inc. Producing methane from coal in situ
US4220203A (en) * 1977-12-06 1980-09-02 Stamicarbon, B.V. Method for recovering coal in situ
US4299295A (en) * 1980-02-08 1981-11-10 Kerr-Mcgee Coal Corporation Process for degasification of subterranean mineral deposits
US4390067A (en) * 1981-04-06 1983-06-28 Exxon Production Research Co. Method of treating reservoirs containing very viscous crude oil or bitumen
US4442896A (en) * 1982-07-21 1984-04-17 Reale Lucio V Treatment of underground beds
US4532986A (en) * 1983-05-05 1985-08-06 Texaco Inc. Bitumen production and substrate stimulation with flow diverter means
US4544037A (en) * 1984-02-21 1985-10-01 In Situ Technology, Inc. Initiating production of methane from wet coal beds
US4702314A (en) * 1986-03-03 1987-10-27 Texaco Inc. Patterns of horizontal and vertical wells for improving oil recovery efficiency
US5016710A (en) * 1986-06-26 1991-05-21 Institut Francais Du Petrole Method of assisted production of an effluent to be produced contained in a geological formation
US5074360A (en) * 1990-07-10 1991-12-24 Guinn Jerry H Method for repoducing hydrocarbons from low-pressure reservoirs
US5246273A (en) * 1991-05-13 1993-09-21 Rosar Edward C Method and apparatus for solution mining
WO1994021889A2 (en) * 1993-03-17 1994-09-29 John North Improvements in or relating to drilling and to the extraction of fluids
US5450902A (en) * 1993-05-14 1995-09-19 Matthews; Cameron M. Method and apparatus for producing and drilling a well
US5411104A (en) * 1994-02-16 1995-05-02 Conoco Inc. Coalbed methane drilling
US5501273A (en) * 1994-10-04 1996-03-26 Amoco Corporation Method for determining the reservoir properties of a solid carbonaceous subterranean formation
US5462116A (en) * 1994-10-26 1995-10-31 Carroll; Walter D. Method of producing methane gas from a coal seam
US5501279A (en) * 1995-01-12 1996-03-26 Amoco Corporation Apparatus and method for removing production-inhibiting liquid from a wellbore
US5669444A (en) * 1996-01-31 1997-09-23 Vastar Resources, Inc. Chemically induced stimulation of coal cleat formation
US5720356A (en) * 1996-02-01 1998-02-24 Gardes; Robert Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well
DE19725996A1 (en) * 1996-06-19 1998-01-02 Robert R Talley Method for conveying water from vertical water borehole system
EP0819834A1 (en) * 1996-07-19 1998-01-21 Gaz De France (Service National) Method for making a cavity in a thin-walled salt mine
US5879057A (en) * 1996-11-12 1999-03-09 Amvest Corporation Horizontal remote mining system, and method
EP0875661A1 (en) * 1997-04-28 1998-11-04 Shell Internationale Researchmaatschappij B.V. Method for moving equipment in a well system
EP0952300A1 (en) * 1998-03-27 1999-10-27 Cooper Cameron Corporation Method and apparatus for drilling a plurality of offshore underwater wells

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002029210A1 (en) * 2000-10-02 2002-04-11 Pompiliu Gheorghe Dinca Draining network for producing oil
WO2002059455A1 (en) * 2001-01-24 2002-08-01 Cdx Gas, L.L.C. Method and system for enhanced access to a subterranean zone
WO2002061233A1 (en) * 2001-01-30 2002-08-08 Cdx Gas, L.L.C. Method and system for accessing subterranean zones from a limited surface area
WO2002061238A1 (en) * 2001-01-30 2002-08-08 Cdx Gas, L.L.C. Method and system for accessing a subterranean zone from a limited surface area
US6681855B2 (en) * 2001-10-19 2004-01-27 Cdx Gas, L.L.C. Method and system for management of by-products from subterranean zones
US6708764B2 (en) * 2002-07-12 2004-03-23 Cdx Gas, L.L.C. Undulating well bore
US6725922B2 (en) * 2002-07-12 2004-04-27 Cdx Gas, Llc Ramping well bores
DE10320401B4 (en) * 2003-05-06 2015-04-23 Udo Adam Process for mine gas production
US6932168B2 (en) 2003-05-15 2005-08-23 Cnx Gas Company, Llc Method for making a well for removing fluid from a desired subterranean formation
CN100392209C (en) * 2005-04-20 2008-06-04 太原理工大学 Rock salt deposit horizontal chamber type oil-gas depot and its building method
CN101699033B (en) * 2009-10-27 2011-12-21 山西焦煤集团有限责任公司 Device for pumping and draining water from downward hole of coal bed
CN102086774A (en) * 2011-01-17 2011-06-08 中联煤层气国家工程研究中心有限责任公司 Drainage method of gas in coal bed
CN102587981A (en) * 2012-03-12 2012-07-18 中国石油大学(华东) Underground salt cavern gas storage and building method thereof
CN106930733A (en) * 2017-05-10 2017-07-07 中国神华能源股份有限公司 Coal bed gas group wells extraction system and method for construction
RU2708743C1 (en) * 2019-04-30 2019-12-11 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Method of drilling offshoots from an openhole well horizontal part
RU2709263C1 (en) * 2019-04-30 2019-12-17 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Method of drilling and development of offshoots from horizontal well
RU2709262C1 (en) * 2019-08-30 2019-12-17 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Method of drilling and development of offshoot from horizontal well (versions)
RU2771371C1 (en) * 2021-08-23 2022-05-04 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Set of assemblies for increasing the filtration area of ​​the bottomhole zone of an open horizontal well

Also Published As

Publication number Publication date
PL193562B1 (en) 2007-02-28
US20020148613A1 (en) 2002-10-17
AU2011200364A1 (en) 2011-02-17
CN1727636B (en) 2011-07-06
RU2259480C2 (en) 2005-08-27
DE69928280T2 (en) 2006-08-10
ID30391A (en) 2001-11-29
CN101158267B (en) 2013-05-22
CN100400794C (en) 2008-07-09
ES2297582T3 (en) 2008-05-01
US20020148605A1 (en) 2002-10-17
US6976533B2 (en) 2005-12-20
EP1975369B1 (en) 2010-09-08
CA2792184A1 (en) 2000-06-02
US6478085B2 (en) 2002-11-12
AU2007211918B2 (en) 2008-09-18
RU2005125568A (en) 2007-01-27
CN1727636A (en) 2006-02-01
ZA200103917B (en) 2002-01-14
US20010015574A1 (en) 2001-08-23
EP1619352A9 (en) 2007-12-26
RU2006144731A (en) 2008-06-20
AU2007211917A1 (en) 2007-09-13
CA2350504A1 (en) 2000-06-02
ATE309449T1 (en) 2005-11-15
CN101328791A (en) 2008-12-24
ATE480694T1 (en) 2010-09-15
CA2350504C (en) 2004-02-10
PL190694B1 (en) 2005-12-30
PL193555B1 (en) 2007-02-28
DE69932546D1 (en) 2006-09-07
US6280000B1 (en) 2001-08-28
EP1131535A2 (en) 2001-09-12
CA2441667A1 (en) 2000-06-02
DE69932546T2 (en) 2007-07-12
US8511372B2 (en) 2013-08-20
US6439320B2 (en) 2002-08-27
US20020134546A1 (en) 2002-09-26
PL193560B1 (en) 2007-02-28
ES2251254T3 (en) 2006-04-16
PL192352B1 (en) 2006-10-31
EP1316673A3 (en) 2004-04-07
CA2483023C (en) 2007-07-24
CN1333858A (en) 2002-01-30
CA2447254A1 (en) 2000-06-02
CA2589332A1 (en) 2000-06-02
EP1619352A1 (en) 2006-01-25
AU2007211917B2 (en) 2008-09-04
US6688388B2 (en) 2004-02-10
CA2447254C (en) 2005-08-02
NZ527146A (en) 2003-11-28
ATE334297T1 (en) 2006-08-15
CA2589332C (en) 2009-06-23
PL193557B1 (en) 2007-02-28
EP1975369A3 (en) 2008-12-03
PL193559B1 (en) 2007-02-28
PL193558B1 (en) 2007-02-28
US6357523B1 (en) 2002-03-19
RU2505657C2 (en) 2014-01-27
US6668918B2 (en) 2003-12-30
ES2271398T3 (en) 2007-04-16
NZ512303A (en) 2003-08-29
RU2008143916A (en) 2010-05-20
CA2661725C (en) 2013-01-08
DE69942756D1 (en) 2010-10-21
NZ528538A (en) 2003-11-28
CA2441672C (en) 2005-02-08
CN101158267A (en) 2008-04-09
EP1131535B1 (en) 2005-11-09
AU2003200203B2 (en) 2005-05-19
AU2007216777A1 (en) 2007-10-04
EP1619352B1 (en) 2008-01-09
US20060096755A1 (en) 2006-05-11
AU2006222767A1 (en) 2006-10-19
CZ20011757A3 (en) 2003-02-12
US6732792B2 (en) 2004-05-11
CA2441671C (en) 2005-02-08
AU3101800A (en) 2000-06-13
AU2005202498A1 (en) 2005-06-30
AU2006222767B2 (en) 2007-10-04
RU2338863C2 (en) 2008-11-20
WO2000031376A3 (en) 2001-01-04
US8297350B2 (en) 2012-10-30
RU2246602C2 (en) 2005-02-20
AU2007211916B2 (en) 2008-11-06
AU2011200364B2 (en) 2013-05-02
DE69937976T2 (en) 2008-12-24
EP1316673B1 (en) 2006-07-26
EP1975369A2 (en) 2008-10-01
AU2007216777B2 (en) 2010-10-28
US20080121399A1 (en) 2008-05-29
AU2007211916A1 (en) 2007-09-13
CA2483023A1 (en) 2000-06-02
US6561288B2 (en) 2003-05-13
US20040031609A1 (en) 2004-02-19
DE69937976D1 (en) 2008-02-21
AU2007211918A1 (en) 2007-09-13
ATE383495T1 (en) 2008-01-15
CA2441667C (en) 2005-06-28
US20010010432A1 (en) 2001-08-02
RU2293833C1 (en) 2007-02-20
AU2005202498B2 (en) 2007-09-13
CA2661725A1 (en) 2000-06-02
US20080060800A1 (en) 2008-03-13
PL193561B1 (en) 2007-02-28
US20020148647A1 (en) 2002-10-17
CN1776196B (en) 2011-08-10
CA2441672A1 (en) 2000-06-02
DE69928280D1 (en) 2005-12-15
PL348705A1 (en) 2002-06-03
AU760896B2 (en) 2003-05-22
RU2013149294A (en) 2015-05-20
CA2441671A1 (en) 2000-06-02
EP1316673A2 (en) 2003-06-04
CN1776196A (en) 2006-05-24

Similar Documents

Publication Publication Date Title
AU760896B2 (en) Method and system for accessing subterranean deposits from the surface
US6679322B1 (en) Method and system for accessing subterranean deposits from the surface
AU2013213679A1 (en) Method and system for accessing subterranean deposits from the surface

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 99815570.5

Country of ref document: CN

AK Designated states

Kind code of ref document: A2

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
AK Designated states

Kind code of ref document: A3

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

ENP Entry into the national phase

Ref document number: 2350504

Country of ref document: CA

Ref document number: 2350504

Country of ref document: CA

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2001/03917

Country of ref document: ZA

Ref document number: 200103917

Country of ref document: ZA

WWE Wipo information: entry into national phase

Ref document number: 31018/00

Country of ref document: AU

WWE Wipo information: entry into national phase

Ref document number: 1999965010

Country of ref document: EP

Ref document number: IN/PCT/2001/00417/DE

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: PA/a/2001/005013

Country of ref document: MX

Ref document number: PV2001-1757

Country of ref document: CZ

WWE Wipo information: entry into national phase

Ref document number: 512303

Country of ref document: NZ

WWP Wipo information: published in national office

Ref document number: 1999965010

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: PV2001-1757

Country of ref document: CZ

WWG Wipo information: grant in national office

Ref document number: 31018/00

Country of ref document: AU

WWG Wipo information: grant in national office

Ref document number: 1999965010

Country of ref document: EP