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Publication numberUS20060054316 A1
Publication typeApplication
Application numberUS 10/939,749
Publication dateMar 16, 2006
Filing dateSep 13, 2004
Priority dateSep 13, 2004
Publication number10939749, 939749, US 2006/0054316 A1, US 2006/054316 A1, US 20060054316 A1, US 20060054316A1, US 2006054316 A1, US 2006054316A1, US-A1-20060054316, US-A1-2006054316, US2006/0054316A1, US2006/054316A1, US20060054316 A1, US20060054316A1, US2006054316 A1, US2006054316A1
InventorsFrancis Heaney, David Houdek
Original AssigneeHeaney Francis M, Houdek David L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method and apparatus for production logging
US 20060054316 A1
Abstract
Method and apparatus are disclosed for performing production logging in a cased well having a plurality of isolated production zones and a tubing string which intersects the production zones. An access device is connected in the tubing string for each of one or more production zones and an intervention tool is conveyed to and positioned in the access device associated with the selected production zone. Production parameters from the selected zone are measured by sensors in the intervention tool.
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Claims(44)
1. A method of production logging in a cased well having (i) a plurality of production zones that are isolated from one another, (ii) a tubing string for conveying production from said production zones to the earth's surface, and (iii) at least one access device connected in said tubing string for each of one or more production zones, each said access device having a port that allows production fluid to flow into in the tubing string, comprising the steps of:
(a) conveying an intervention tool to an access device associated with a production zone from which production parameters are to be measured;
(b) positioning said intervention tool in said access device so that production fluid passes through the intervention tool; and
(c) measuring parameters of the selected production zone with sensors contained in said intervention tool.
2. The method of claim 1, further comprising the step of providing data respecting said measured parameters to a computer that is located at the earth's surface.
3. The method of claim 2, further comprising the step of using the data respecting the measured parameters to make decisions concerning production from the selected production zone.
4. The method of claim 2, further comprising the steps of repeating the steps of claim 2 for at least one more production zone in the well.
5. The method of claim 4, further comprising the step of using the data respecting the measured parameters from the measured production zones to make decisions concerning production from the well.
6. The method of claim 1, further comprising the step of storing data respecting said measured parameters in a memory device.
7. The method of claim 6, further comprising the step of providing the data stored in the memory device to a computer.
8. The method of claim 6, further comprising the steps of repeating the steps of claim 6 over a preselected period of time.
9. The method of claim 8, further comprising the step of providing the data stored in the memory device to a computer.
10. The method of claim 1, wherein step (b) comprises reducing the cross-sectional area through which production fluid from said production zone may flow.
11. A method of production logging in a cased well having (i) a plurality of production zones that are isolated from one another, (ii) a tubing string for conveying production from said production zones to the earth's surface, and (iii) at least one sliding sleeve device connected in said tubing string for each of one or more production zones, each said sliding sleeve having a port which permits production fluid to flow into the tubing string, comprising the steps of:
(a) outfitting an intervention tool with one or more sensors to measure parameters;
(b) conveying said intervention tool to a sliding sleeve device associated with a production zone from which production parameters are to be measured;
(c) positioning the intervention tool in said sliding sleeve device so that the production fluid entering the port of said sliding sleeve device passes through the intervention tool; and
(d) measuring parameters of the production zone with the sensors contained in the intervention tool.
12. The method of claim 11, further comprising the step of providing data respecting said measured parameters to a computer that is located at the earth's surface.
13. The method of claim 12, further comprising the step of using the data respecting the measured parameters to make decisions concerning production from the selected production zone.
14. The method of claim 12, further comprising the steps of repeating the steps of claim 11 for at least one more production zone in the well.
15. The method of claim 14, further comprising the step of using data respecting the measured parameters from the measured production zones to make decisions concerning production from the well.
16. The method of claim 11, further comprising the step of storing data respecting said measured parameters in a memory device.
17. The method of claim 16, further comprising the step of providing the data stored in the memory device to a computer.
18. The method of claim 16, further comprising the steps of repeating the steps of claim 15 over a preselected period of time.
19. The method of claim 18, further comprising providing the data stored in the memory device to a computer.
20. The method of claim 11, where step (c) comprises reducing the cross-sectional area through which production fluid from said production zone may flow.
21. Apparatus for use in production logging operations in a cased, completed well having a plurality of production zones that are isolated from one another and a tubing string for conveying the production from said production zones to the earth's surface, comprising:
(a) a plurality of access devices connected in the tubing where there is at least one access device for each of one or more of said production zones; and
(b) an intervention tool which: (i) is conveyed through the tubing string from the surface of the earth to a selected one of the access devices, (ii) is positioned in the selected access device, and (iii) contains sensing devices to measure parameters of the production zone corresponding to the access device in which the intervention tool is positioned.
22. The apparatus of claim 21, wherein the sensing devices are selected from a group of devices which measure pressure, density, temperature, capacitance/dielectric and/or velocity.
23. Apparatus for use in production logging operations in a cased, completed well having a plurality of production zones that are isolated from one another and a tubing string for conveying the production from said production zones to the earth's surface, comprising:
(a) a plurality of sliding sleeve devices connected in the tubing string where there is at least one sliding sleeve device for each of one or more of said production zones; and
(b) an intervention tool which: (i) is conveyed through the tubing string from the surface of the earth to a selected one of the sliding sleeve devices, (ii) is positioned in the selected sliding sleeve device, and (iii) contains sensing devices to measure parameters of the production zone corresponding to the sliding sleeve in which the intervention tool is positioned.
24. The apparatus of claim 23, wherein the sensing devices are selected from a group of devices which measure pressure, density, temperature, capacitance/dielectric and/or velocity.
25. A production logging system for use in a cased, completed well having a plurality of production zones that are isolated from one another and a tubing string for conveying the production from said production zones to the earth's surface, comprising:
(a) a plurality of access devices connected in the tubing string where there is at least one access device for each of one or more of said production zones;
(b) an intervention tool which: (i) is conveyed through the tubing string from the surface of the earth to a selected one of the access devices, (ii) is positioned in the selected access device, and (iii) contains sensing devices to measure parameters of the production zone corresponding to access device in which the intervention tool is positioned;
(c) a computer which receives data respecting the measured parameters and processes that data; and
(d) a recorder operatively coupled to the computer for displaying information respecting the measured parameters.
26. The system of claim 25, wherein the sensing devices are selected from a group of devices which measure pressure, density, temperature, capacitance/dielectric and/or velocity.
27. A production logging system for use in a cased, completed well having a plurality of production zones that are isolated from one another and a tubing string for conveying the production from said production zones to the earth's surface, comprising:
(a) a plurality of sliding sleeve devices connected in the tubing string where there is at least one sliding sleeve device for each of one or more of said production zones;
(b) an intervention tool which: (i) is conveyed through the tubing string from the surface of the earth to a selected one of the sliding sleeve devices via the tubing string, (ii) is positioned in the selected sliding sleeve device, and (iii) contains sensing devices to measure parameters of the production zone corresponding to the sliding sleeve in which the isolation tool is positioned;
(c) a computer for receiving data respecting the measured parameters and for processing that data; and
(d) a recorder operatively coupled to the computer for displaying information respecting the measured parameters.
28. The apparatus of claim 27, wherein the sensing devices are selected from a group of devices which measure pressure, density, temperature, capacitance/dielectric and/or velocity.
29. Apparatus for use in production logging operations in a cased, completed well having a plurality of production zones that are isolated from one another, a tubing string for conveying the production from said production zones to the earth's surface, and a plurality of access devices connected in the tubing string where there is at least one access device for each of one or more of said production zones, comprising:
an intervention tool which (i) is for conveyance through the tubing string from the surface of the earth to a selected one of the access devices, (ii) is for positioning in the selected access device, and (iii) contains sensing devices to measure parameters of the production zone corresponding to the access device in which the intervention tool is positioned.
30. The apparatus of claim 29, wherein the access devices are sliding sleeve devices.
31. The apparatus of claim 29, wherein the sensing devices are selected from a group of device which measure pressure, density, temperature, capacitance/dielectric and/or velocity.
32. A method of production logging in a cased wellbore having a tubing string for conveying production fluid from the wellbore to the earth's surface, said tubing string including a landing device, comprising the steps of:
outfitting an intervention tool with sensing devices;
conveying the intervention tool to the landing device;
cooperatively engaging the intervention tool with the landing device so that production fluid flows through the intervention tool; and
measuring parameters of the production fluid with the sensing devices in the intervention tool.
33. The method of claim 32, further comprising the step of providing data respecting said measured parameters to a computer that is located at the earth's surface.
34. The method of claim 33, further comprising the step of using the data respecting the measured parameters to recommend decisions concerning production from the selected production zone.
35. The method of claim 33, further comprising the steps of repeating the steps of claim 31 for at least one more production zone in the well.
36. The method of claim 35, further comprising the step of using the data respecting the measured parameters from the measured production zones to recommend decisions concerning production from the well.
37. The method of claim 32, further comprising the step of storing data respecting said measured parameters in a memory device.
38. The method of claim 37, further comprising the step of providing the data stored in the memory device to a computer.
39. The method of claim 37, further comprising the steps of repeating the steps of claim 35 over a preselected period of time.
40. The method of claim 39, further comprising the step of providing the data stored in the memory device to a computer.
41. A method of production management for a hydrocarbon producing well having a plurality of potential production zones intersected by a wellbore, said method comprising:
casing the wellbore;
providing potential access through the casing to a plurality of said potential production zones;
running a tubing string inside of the casing and in communication with the surface;
isolating one or more of the potential production zones;
providing one or more access devices each associated with one of the isolated potential production zones to allow selective fluid communication from said production zone into the tubing;
engaging an intervention tool with one of said access devices;
collecting data by measuring parameters of the isolated potential production zone associated with the engaged access device using sensors contained in said intervention tool; and
making decisions for production management based on the data.
42. The method of claim 41, wherein data is collected at multiple production zones.
43. The method of claim 42, wherein the decisions for production management comprise leaving access devices open or shut, and treating an isolated section.
44. The method of claim 41, wherein the well is monitored over time and production from the well is optimized on an ongoing basis in response to changes in the well.
Description
BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to method and apparatus for production logging in a cased, multilayer wellbore.

2. Description of the Prior Art

Well logging surveys are often made in producing oil and gas wells to determine the volumetric concentration of the oil, gas and unwanted water components in the production flow. These data along with measurements of the fluid flow velocity, pressure and temperature may be used to determine production rates and other information from each zone of interest in the well. Such data are essential for the improvement of oil and gas production, reducing water production, managing the field reservoir, and optimizing production from the well.

Obtaining reliable production information in deviated, multilayered, multi-phased reservoirs has proven to be a difficult task. This is due to segregation of the lower density phases, e.g. oil and gas, migrating to the high side of the hole where they cannot be adequately measured by centralized sensors. Such sensors may have a very limited circumferential area of measurement and may not read globally. Additionally, the heavier fluids, e.g. water, suffer from a phenomena known as “water fallback” where the heavier fluids falls back downhole, which may cause the velocity measurement to read an incorrect flow rate. Fluid segregation and fallback thus prevent all current technology from providing reliable production data in the majority of deviated wellbores.

Another shortcoming of current production logging technology is that it can only measure pressure in the borehole or production tubing and not the actual reservoir pressure of an individual layer in a multilayer reservoir. Capturing the actual reservoir pressure from the individual layer is critical to well optimization and proper understanding of reservoir support mechanisms, e.g. water floods.

If reliable production information concerning a reservoir can be obtained, decisions concerning the management of the reservoir should be enhanced. For example, with reliable production information from the production zones in a reservoir, informed decisions may be made concerning whether to continue to produce from a production zone, to close a production zone, or to treat a production zone, e.g. by fracturing. This affords an opportunity to respond to changes over time with the selection of production zones open to the production tubing. For example, production from hydrocarbon rich zones at relatively lower pressures may be delayed for the pressure to drop with the passage of time from production from higher pressure production zones. A failure to properly balance this may cause hydrocarbons brought out of one production zone to flow back into another zone at lower pressure, causing lost production and perhaps damage to the latter formation. Similarly, it can be useful to make other changes over time in managing individual production zones, the collective total, and the combined fluids produced based on the mixture of gas, water, and oil constituents, temperature, or other parameters observable from the fluid produced among each of several selected zones. Such informed decisions will tend to increase and perhaps even maximize production from the reservoir.

SUMMARY OF THE INVENTION

In accordance with the present invention, a method of production logging in a cased well is provided. The cased well has a plurality of production zones that are isolated from one another and a tubing string for conveying production from said zones to the earth's surface. At least one access device is connected in the tubing string for each of one or more production zones, and each such access device has a port that allows production fluid to flow into the tubing string.

A method in accordance with the present invention comprises the steps of selecting one of the production zones from which to measure production parameters and then conveying an intervention tool to an access device associated with the selected production zone. A method in accordance with the present invention further comprises the step of positioning the intervention tool is in the selected access device so that the production fluid passes through the intervention tool. That step of positioning the intervention tool in the selected access device may comprise reducing the cross-sectional area through which production fluid from the selected production zone may flow. A method in accordance with the present invention further comprises measuring parameters associated with the production zone using sensors which are contained in the intervention tool.

The data that is generated by measuring the parameters of the production zone may be directly provided to a computer at the earth's surface. Alternatively, that data may first be stored in a memory device (which may be located downhole) and then provided to a computer. This computer may be programmed to use the data respecting the measured parameters to make decisions concerning future production from the well.

A method in accordance with the present invention comprises repeating the aforesaid steps for at least one more production zone in the well, and using the data respecting the measured parameters from the measured production zones to make decisions concerning the production from the well.

In accordance with the present invention apparatus is provided for use in production logging operations in a cased well having a plurality of production zones that are isolated from one another and a tubing string for conveying the production from the production zones to the earth's surface. Apparatus in accordance with the present invention comprises a plurality of access devices, which may be sliding sleeve devices and which are connected in the tubing string. At least one access device is connected in the tubing string for each of one or more production zones in the cased well. Apparatus in accordance with the present invention further comprises an intervention tool which is conveyed through the tubing string from the surface of the earth to a selected one of the access devices and is positioned in the access device that is associated with the selected production zone. One function that the intervention tool provides is to isolate the selected production zone from the other production zones. Once the intervention tool is positioned, the production flow from the isolated/selected production zone passes through the intervention tool, and the intervention tool contains sensors to measure parameters associated with the production zone corresponding to the access device in which the tubular member is positioned. The sensors may be selected from a group including those which measure pressure, density, temperature, capacitance/dielectric and velocity.

In accordance with the present invention, a production logging system is provided for use in a cased well having a plurality of production zones that are isolated from one another and a tubing string for conveying the production from said production zones to the earth's surface. The system comprises a plurality of access devices connected in the tubing string where there is at least one access device for each of one or more of said production zones. In one embodiment the access devices are sliding sleeve devices. A system according to the present invention comprises an intervention tool which is conveyed from the earth's surface to an access device associated with a selected production zone and which is positioned in that selected device. Parameters of the production zone corresponding to access device in which the intervention tool is positioned are measured with sensors in the intervention tool. A system in accordance with the present invention further comprises a computer which receives and processes the aforesaid data, and a recorder operatively connected to the computer for displaying information respecting said measured parameters.

In accordance with the present invention apparatus comprising an intervention tool is provided for use in production logging operations in a cased, completed well having a plurality of production zones that are isolated from one another, a tubing string for conveying the production from said production zones to the earth's surface, and one or more access devices connected in the tubing string where there is at least one access device for each of one or more of said production zones. An intervention tool in accordance with the present invention is for conveyance through the tubing string and is for positioning in the selected access device. An intervention tool according to the present invention comprises sensing devices to measure parameters of the production zone corresponding to the access device in which the intervention tool is positioned.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an elevational view in partial cross-section of a cased, completed well.

FIG. 1A is an elevational view in partial cross-section of a cased, completed well.

FIG. 2 is a perspective view in cross-section which illustrates a portion of a prior art sliding sleeve access device which may be used in the well completion shown in either FIG. 1 or FIG. 1A.

FIG. 3 is a perspective view of a prior art separation tool.

FIG. 4 is a perspective view of an isolation tool for use as part of an intervention tool in the present invention.

FIG. 5 is an elevation view in cross-section which illustrates a sliding sleeve device with an intervention tool positioned therein in accordance with the present invention.

FIG. 6 is an enlargement of that portion of the apparatus of FIG. 5 which is contained in the box labeled 6 in FIG. 5.

DESCRIPTION OF SPECIFIC EMBODIMENTS

It will be appreciated that the present invention may take many forms and embodiments. Some embodiments of the invention are described so as to give an understanding of the invention. It is intended for the embodiments of the present invention described herein to be illustrative, and not limiting, of the invention.

In accordance with the present invention, method and apparatus are provided for production logging in a cased, completed wellbore. With reference first of FIG. 1, there is illustrated a cased completed wellbore 10 having multiple production zones 12, 14 and 16. A tubing string 18 positioned in wellbore 10 intersecting the production zones 12, 14 and 16. Access through the casing 20 to production zones 12, 14 and 16 is provided by perforating the casing at 12 a, 14 a and 16 a. The wellbore 10 has a casing 20, and an annulus 22 between the casing 20 and the tubing string 18. Inflated packers 24,25 and 26 isolate the production zones 12, 14 and 16 from one another. While completed wellbore 10 is illustrated as a vertical well, those skilled in the art will appreciate that the present invention is also applicable to deviated wells.

The tubing string 18 comprises a plurality of tubular members, i.e. pipes, which are joined together in threaded engagement. A plurality of access devices 30 are joined in threaded engagement to tubular members in the tubing string 18. Each production zone 12, 14 and 16 has at least one access device 30 associated with it. While FIG. 1 illustrates an embodiment with one access device 30 per production zone, another embodiment may include more than one access device 30 per production zone. Access devices 30 may be opened and closed to permit selective control of fluid flow between each of the production zones 12, 14 and 16 and the tubing string 18. Each access device has an axial bore (not shown in FIG. 1) which forms a passage from one end of the access device to the other, and when the access device is opened, production fluids may flow into the tubing string 18 via port 29.

The tubing string 18 connects to a wellhead 21 which is located at the earth's surface. The production fluids may be directed from the tubing string 18 via the wellhead to a pipeline (not shown). Wellhead 21 includes a port to permit access to the tubing string 18 by logging apparatus.

With reference now to FIG. 1A, another configuration of a cased, completed wellbore 100 with which the method and apparatus of the present invention may be used is illustrated. Wellbore 100 comprises two production zones 112 and 114 and access through the casing 20 to production zones 112 and 114 is provided by perforating the casing 20 at 112 a and 114 a. A tubing string 118 is positioned in wellbore 100 intersecting production zones 112 and 114. The wellbore 100 has a casing 20 and an annulus 22 between the casing 20 and tubing string 118. Inflated packers 24 and 25 isolate the production zones 112 and 114 from one another.

In the completed wellbore 100 of FIG. 1A, production zone 112 has at least one access device 30 associated with it, while production zone 114 does not have any access device associated with it. The completion configuration shown in FIG. 1A may, for example, be employed when it is reasonably certain that sustained production from production zone 114 will be realized without need for the convenient access and shut-off capability of an access device, yet where zone 112 requires convenient access and shut-off capability and required, the production from zone 112 will require monitoring.

In the completed wellbores shown in FIGS. 1 and 1A, there is at least one access device connected in the tubing string for “each of one or more of the production zones.” In FIG. 1, there is illustrated at least one access device 30 for each production zone 12, 14 and 16, and in FIG. 1A, there is illustrated at least one access device 30 for production zone 112.

In one embodiment, each access device 30 in FIGS. 1 and 1A is a DuraSleeve brand sliding sleeve device that is available from Halliburton. With reference now to FIG. 2, each such a sliding sleeve device comprises a sliding sleeve 40 having openings 42 formed therein. The exterior of each sliding sleeve device also has a plurality of openings 44 formed therein. Using well known techniques, the sleeve 40 in each sliding sleeve device may be moved to an open position as shown in FIG. 2 where the openings 42 in sleeve 40 are aligned with the openings 44 in the exterior of the sliding sleeve or to a closed position where the openings 42 in the sliding sleeve 40 are not aligned with the openings 44. In the closed position, seals 46 and 48 prevent production flow from a production zone from entering the bore of the sliding sleeve device and hence from entering the tubing string 18.

Referring now to FIG. 5, apparatus in accordance with the present invention comprises an intervention tool which is positioned in a sliding sleeve device. The intervention tool comprises an isolation tool 51 and a dart 52. In FIG. 5, the isolation tool 51 and the dart 52 are shown positioned in a downhole sliding sleeve device.

With reference to FIGS. 3, 4, and 5 the isolation tool 51 (FIGS. 4 and 5) is formed by modifying separation tool 53 (FIG. 3). Separation tool 53 is a product that is manufactured by Halliburton. Separation tool 53 has been modified as follows to make isolation tool 51: (a) The equalizing sub 54 has been moved near the bottom of the tool as shown in FIG. 4; (b) ports 55 have been formed into tubular number 56; and (c) the lower end of 57 of the separation tool has been closed off.

With reference to FIGS. 4, 5 and 6, when isolation tool 51 is positioned in access device 30, the ports 55 in isolation tool 51 are fluidly coupled with (and may be adjacent to) the ports 42 in access device 30, and all production fluid is directed through ports 55, because of seals 49 and 50 in isolation tool 51. Similarly, when dart 52 is positioned in isolation tool 51 as shown in FIGS. 5 and 6, ports 75 in dart 52 are fluidly coupled with (and may be adjacent to) the ports 55 and the ports 42 in access device 30 and all production fluid (schematically shown with the arrow 76 in FIGS. 5 and 6) is directed through dart 52, because of the seals 52A in dart 52. Those skilled in the art who have the benefit of the present disclosure, will appreciate that dart 52 need not be positioned in isolation tool 51 as shown in FIG. 5, but may be positioned above isolation tool 51, so long as substantially all the production fluid from the production zone being monitored passes through dart 52.

Dart 52 contains a plurality of sensors in its bore, which may, for example, include devices to measure pressure, density, temperature, capacitance/dielectric and/or velocity at the selected zone. In particular, the sensors may include: (a) in-line spinner 65 to measure velocity; and (b) fluid identification sensors, density sensors (nuclear or vibration method) and capacitance/dielectric sensors located at 63 between baffle plates 64. Baffle plates 64 are employed to force fluid into the fluid identification sensors to ensure accurate recording. The bore of dart 52 may also contain a sealing device 66 which may, for example, be a door 66 that is remotely controlled by a timer (not shown) that is powered by battery 69. When the sealing device 66 is closed as shown in FIG. 5, actual reservoir pressure and temperature data may be recorded for a preselected period of time (e.g., up to 48 hours) from the pressure and temperature sensors located at 68. After that preselected period of time as elapsed, sealing device 66 maybe opened to allow production fluid to flow through the upper sensors at 63.

Dart 52 may also include ports 70 to allow fluid from below to enter the base of dart 52. In the event of a pressure differential between the fluid in the bore of dart 52 and the fluid below dart 52, there will be fluid movement toward equilibrium, and this fluid movement may be measured by spinner 67.

When it is desired to measure parameters of a selected production zone, the isolation tool 51 is conveyed through the tubing string 18 from the earth's surface to a sliding sleeve device 30 corresponding to the selected production zone by wireline, slickline, coiled tubing or other conveyance techniques. Preferably, such conveyance is carried out using conventional wireline techniques. The isolation tool 51 is positioned in the sliding sleeve device using the same techniques that are used to position a separation tool in a sliding sleeve device. The sliding sleeve device may be an “X” landing nipple profile and isolation tool 51 would therefore have locking keys 58 which match that nipple profile. Any nipple profile assembly or other “landing device” for cooperatively engaging a tool within the bore of another tool may, be used, so long as it is adequate to install the isolation tool 51. The ports 55 that were formed in tubular member 56 become fluidly coupled with and may be adjacent to the ports 44 in the sliding sleeve device 30 when the isolation tool 51 is positioned in the sliding sleeve. Once the isolation tool is positioned, the wireline is retrieved, and dart 52 is then lowered and is positioned within isolation tool 51, as illustrated in FIG. 5. Dart 52 has seals 52A which engage the inner surface of isolation tool 51 so that production flow is directed through dart 52, when dart 52 is positioned as in FIG. 5.

In one embodiment of the present invention, the intervention procedure is thus a two “trip” process—one trip to position the isolation tool 51 in the sliding sleeve device and a second trip to position the dart 52 in the isolation tool 51. Similarly, the intervention tool in this embodiment comprises apparatus composed of two component pieces. Those skilled in the art, having the benefit of the present disclosure, will appreciate that the intervention procedure may be carried out in a single trip and that the isolation tool 51 and dart 52 may be formed as an integral piece of apparatus. The appended method claims are intended to cover multiple or single trip procedures to position the intervention tool and the appended apparatus/system claims are intended to cover an intervention tool which is formed as a single unit or in two or more component pieces.

With reference to FIGS. 5 and 6, the cross-sectional area through which production fluid flows is reduced by the positioning of isolation tool 51 and dart 52 in the sliding sleeve corresponding to the selected production zone. Because of this reduced cross-sectional area, it is believed that the production flow will have increased homogeneity, which should result in increased accuracy of measurements being made by the sensors 60 in dart 52. By having a more homogeneous flow, fluid segregation and fallback should be reduced, often minimized, and potentially fully avoided.

Referring to FIGS. 1, 2 and 5 as the sensors measure parameters of the selected production zone, data respecting such measurements may be stored in a memory device 61 which is located in dart 52 and then such data may be provided to computer 31 which may be located at the earth's surface. Alternatively, data respecting said measurements may be transmitted to computer 31 via a logging cable 32 or by well-known wireless communication techniques. Computer 31 processes the data and the processed data may be displayed on a computer monitor, provided to recorder 33 for printing on a recording medium 34, or otherwise provided in a useful form to the well operator.

By using the method and apparatus of the present invention, the well operator has more accurate and meaningful data concerning the production zone than has heretofore been available. In particular, the operator is able by using the present invention to measure actual reservoir pressure at each production zone of interest, which by itself should enhance well optimization endeavors. Without this information, production decisions may be based on more difficult to interpret data, for example, data in which information about an individual production zones may be interfered with by parameters such as the hydrostatic head and/or the net flowing pressure of other production zones.

Using the apparatus of the present invention, an operator has the ability to operate the apparatus in a long term memory mode in order to accumulate data over a preselected period of time, e.g. between one and thirty days. By accumulating information over such period of time, the operator is able to provide a more accurate information concerning the zone of interest. For example, as wells mature, water production generally increases which can cause the well to slug, and this effect is amplified with well deviation. The occurrence of the slug may, however, be difficult to predict. Therefore, by sampling the well over an extended period of time, it is believed that the effects of slugging can be averaged to provide a more consistent interpretation of results than are currently available.

Once measurements have been completed at one production zone, the intervention tool comprising the isolation tool 51 and dart 52 may me relocated to another production zone, and the above-described process may be repeated.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7543636 *Oct 6, 2006Jun 9, 2009Schlumberger Technology CorporationDiagnostic sleeve shifting tool
US8490704Aug 2, 2010Jul 23, 2013Schlumberger TechnologyTechnique of fracturing with selective stream injection
US8499828 *Dec 16, 2009Aug 6, 2013Schlumberger Technology CorporationMonitoring fluid movement in a formation
US20110139443 *Dec 16, 2009Jun 16, 2011Schlumberger Technology CorporationMonitoring fluid movement in a formation
Classifications
U.S. Classification166/250.01, 166/313
International ClassificationE21B47/00, E21B43/12
Cooperative ClassificationE21B33/124, E21B47/10
European ClassificationE21B47/10, E21B33/124
Legal Events
DateCodeEventDescription
Jan 2, 2007ASAssignment
Owner name: HALLIBURTON ENERGY SERVICES, INC., TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HEANEY, FRANCIS MICHAEL;HOUDEK, DAVID LYNN;REEL/FRAME:018698/0657;SIGNING DATES FROM 20061124 TO 20061229
Sep 13, 2004ASAssignment
Owner name: HALLIBURTON ENERGY SERVICES, INC., TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HEANEY, FRANCIS MICHAEL;HOUDEK, DAVID LYNN;REEL/FRAME:015793/0512
Effective date: 20040911