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Publication numberUS3113620 A
Publication typeGrant
Publication dateDec 10, 1963
Filing dateJul 6, 1959
Priority dateJul 6, 1959
Publication numberUS 3113620 A, US 3113620A, US-A-3113620, US3113620 A, US3113620A
InventorsHemminger Charles E
Original AssigneeExxon Research Engineering Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Process for producing viscous oil
US 3113620 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Dec. 10, 1963 c. E. Hl-:MMINGER 3,113,620

PRocEss FOR PRODUCING vIscoUs oIL Filed July 6, 1959 /ze f22 sl-:PARATOR l 2| -VENT w TLSRSINE a A|R g l COMPRESSOR Y A'R OIL l BITUMINOUS DEPOSIT Chdr|esE.Hemminger Inventor United States Patent O 3,113,620 PROCESS FR PRODUCENG VISCGUS @EL Charles E. Hemmingen', Westfield, NJ., assigner to Esso Research and Engineering Company, a corporation of Delaware Filed .Iuly 6, 1959, Ser. No. 824,967 6 Claims. (Cl. 166-11) The present invention relates to an improved process for recovering viscous oil from subsurface deposits and, more particularly to a method for utilizing high energy explosives combined with in-situ combustion in a subsurface bituminous deposit containing viscous oil. Suitable deposits are subsurface strata containing hydrocarbons not naturally owable into a well bore traversing the deposit. In a most preferred process, according to the instant invention, oil is produced from oil shale reserves.

Control of the tremendous energy of nuclear devices for peacetime uses has, of late, become a subject of considerable interest. With the knowledge that such energy in the form of thermonuclear explosives should be available for a fraction of a mill per kilowatt-hour equivalent, numerous applications involving underground explosions have been proposed. Further, it has now been realized that ultra high energy explosions can be used in mining operations to break up formations, in the oil industry to increase or stimulate productivity by heating or raising the pressure of a reservoir, and in landscaping or earth moving techniques such as digging canals, making harbors, or removing troublesome obstacles.

The present invention is primarily directed to the production of oil. Further, it provides a method for preparing and utilizing an underground explosion chamber in a bituminous deposit suitable for the explosion of a high energy explosive charge. In accordance with the instant invention, oil is recovered from a subsurface bituminous formation by detonating an explosive within a well bore penetrating the formation and thereafter moving a combustion front downwardly through the formation adjacent the well bore. Oil is removed to the surface from the lower prtion of the formation through the single Well traversing the formation. In a preferred process, the above steps are repeated utilizing successively larger explosions until a cavity of approximately spherical dimensions is formed in the formation. Thereafter, an ultra-high energy explosive is detonated in the chamber formed to fragment a large volume of the bituminous formation and lill the cavity with broken and crushed material of the formation. The massive fragmented zone is then treated by conventional operations, such as in situ combustion or by water flooding With high temperature liquid phase Water in accordance with a process described in copending application S.N. 802,358, filed March 27, 1959.

Advantageously, in accordance with the present invention, nuclear energy can be released in an underground explosion of a thermonuclear device in a bituminous deposit containing hydrocarbons not naturally flowable into a Well bore traversing the deposit. Alternately, conventional molecular explosives can be employed. A particular advantage of the invention is that ultra-high energy explosives, either molecular or nuclear, can now be utilized by creating a specially prepared explosion chamber within the bituminous deposit. A cavity or explosive chamber is formed in a bituminous deposit which deposit contains substantial amounts of magnesium and calcium carbonates according to this invention by first detonating a small explosive charge in the well bore, then initiating combustion in the upper portion adjacent the well bore to establish a combustion front and thereafter injecting a combustion-supporting gas into the upper portion of the deposit to move the flame front downwardly and outwardly around the well bore, and then detonating a second explosion. By this method, the products of combustion remove substantially all organic material from an extended region in the vicinity of the Well bore, leaving a cavity in the deposit containing only a frail ash skeleton of rock. The second explosion detonated in the bore hole shatters the frail ash skeleton of rock, thus forming the cavity and at the same time causes additional fractures in the walls of the cavity. The in situ combustion step is repeated after each explosion, thereby forming another and larger area of frail ash skeleton of rock. Oil derived from the bituminous deposit by the combustion step can be removed to the Surface through the well bore extending through the bottom of the burned-out zone. By repeating the steps outlined, the cavity can be increased in size many fold.

An important feature of the present invention lies in the fact that, by creating an explosion chamber containing only a very friable skeleton of ash, many problems concerned with the shock wave created by the explosion are obviated. As most atomic devices release energy equivalent to that of a major earthquake, Without special precautions, shockwave can result in significant motion of the earths surface. In accordance with this invention, the loss of energy from an H-bomb or an A-bornb blast in the explosion chamber underground is substantially reduced due to transmission of shock wave energy through the skeleton ash material of the chamber. Therefore, substantially all the energy released can be utilized to provide sensible heat to raise the temperature of the fragmented rock which falls into the cavity following the expansion stage of the nuclear explosion.

Alternately, the very frail skeleton ash can be knocked down prior to the detonation of the ultra-high energy device simply by exploding a small charge or by utilizing a water Washing technique in accordance with conventional ooding practice in secondary recovery operations. The advantage of having a large, substantially empty cavity is readily apparent. The extremely large cavity from which the ash skeleton has been knocked down or removed, can be used to contain many tous of conventional molecular explosives. Further, it may be necessary to provide a suitable liner within the explosion chamber in order to avoid extensive contamination of underground formation materials and adjacent water tables by the radioactivity produced by the explosion of the device involving nuclear fission. In such cases extremely large cavities are required.

Broadly, bituminous deposits containing oil-shale can be produced in accordance With the method of the present invention. The process is suitable for rock formations known as oil shale which contain a combination of organic and inorganic sediments which have become hardened into impermeable rock. Suitable shales have a compressive strength in the range of 5000 to 30,000 p.s.i. The organic portion laid down in layers is a solid amorphous material generally known as kerogen which can be converted to oil under the application of heat. The oil recovered is a black viscous waxy substance which will not ow below about or 90 F.

Further objects and features of the invention and an exemplary manner in which it is 'toi lbe performed will be more readily apparent from the accompanying description taken in connection 'with the drawing in which .the

4single FIGURE shows schematically a method of'recovering viscous oil and at the saine time preparing a subsurface explosion chamber in a bituminous Vdeposit in which a high energy explosive device can be exploded `to* produce a massive fractured zone of rook for subsequent underground treatment.

Advantageously, the :method of the present invention is employed with bituminous deposits lying in the range of from to 20,000- feet below the surface of the earth.

The minimum ground cover `required is that necessary to insure complete containment of the explosion. This depends upon the energy yield of the explosive utilized. For nuclear devices, the minimum depth in feet is approximately equal to in the range of 250 to 450 times the cube root of the size of the device in kilotons. Thus, the explosion from a one kiloton nuclear bomb is completely contained if the device is exploded 250 to 450 feet below the nearest surface point. The maximum depth is limited only by the economic considerations involved in penetrating very deep lying formations with conventional drilling equipment.

Explosives suitable for use within a subsurface bituminous deposit are Well known in the ar-t. Due to the space limitation inherent in the process involving detonation of an explosive in a well bore, explosives having a high energy yield for their size are especially preferred. Most preferably, the explosion will have an energy yield equivalent to in the range of 0.1 kiloton to megatons of TNT. However, inexpensive chemical explosives such as ammonium nitrate can be employed. In one embodiment, the method of the present invention is carried out utilizing a thermonuclear device such as a hydrogen or atomic bomb. Suitable thermonuclear devices are now available for underground explosions; therefore, it is to be understood that the present discovery involves merely the use of a nuclear device in a novel and useful method `for exploiting oil deposits, and that the fabrication and manufacture of hydrogen and atomic bombs form no part of this invention.

Initially, `when a thermonuclear device is exploded in an underground oil deposit, an isothermal ball of fire is produced, which produces a very high pressure and temperature. The intensity of energy absorbed from the shock wave is sufficiently high near the fireball to vaporize rock and increase the size of the explosion chamber, then melt rock outside the vaporized sphere, and crush more rock outside the melted liner. The cavity, at much higher than equilibrium ground pressure, is held back by the inertia of the surrounding rock but then expands to equalize the cavity pressure with ground pressure pushing the crushed but -unvaporized rock ahead of it, more or less isotropically. Almost immediately the cavity is collapsed and the crushed bituminous rock caves into the void which has been created, forming a massive fractured zone which is then exploited by a conventional process such as the hot water process already referred to. In this process, oil is recovered from the fragmented zone by supplying high pressure water, steam or brine to the zone through an injection well or injection wells at a temperature in the range of 550o to 800 F. to supply the hea-t to decompose the bituminous material and carry out the oil ythrough a production well. Sufficient pressure is employed to maintain the high temperature water in dense phase. Recovery efficiencies approaching 100% can be achieved at reasonable rates of water injection suicient to advance the heated zone at a velocity in the range of 0.1 to 5 feet per day. The flood water at a temperature in the range of 550 to 800 F. is supplied to the fragmented zone by injecting water, steam or brine or a mixture of these at high temperature at the top of the crushed zone. Where water is injected through the injection well through a casing set to the top of the fragmented Zone, oil can be produced by the action of the water from the bottom of the zone through a production well `set `to the lower most region of the fractured zone. Alternately, an in-situ combustion process can be employed.

Referring to the drawing in detail, reference character 1 designates a bituminous oil shale deposit which does not produce itself under natural conditions. This deposit can be an oil-shale having essentially no permeability and containing non-mobile oil in the form of kerogen, laid down in the Irock in layers. It is isolated by adjacent strata 2 and 3. Within bituminous deposit 1 which, for example, can be of the order of 1000 feet thick there has L been formed :a substantially spherical explosion chamber 4- containing a peripheral friable skeleton of ash 5 left in place following the combustion step.

Reference character 11 designates a well bore extending downwardly from the sunface 12 through formation 2- and terminating in formation 1. It will be understood that the weli bore actually extends through a plurality of subsurface formations and that only a total of three formations are shown in 4the drawing for simplification. A well `casing 13 extends downwardly through the well bore 11 and into the bituminous deposit l1 to be exploited. The upper end 14 of the casing is capped or closed off above the surface and a conduit 15 communi- Cates with the casing above the surface for purposes which will be hereinafter set forth. By drilling from the top of formation 1 to a predetermined depth a single string of tubing 16 is placed concentrically in casing 13 and terminates beiow the lower end of casing '13 whereby oil which accumulates in the well bore, as will be more fully hereinafter set forth, can be removed to the surface. In the case of impermeable shale rock, gas communication is established from the well bore at the upper portion of the formation downwardly through the formation around the well bore and lback into the well bore in the lower portion of the formation by detonating an explosive charge. Redrilling for setting casing 16 is usually required after the fracturing operation.

In practicing the present invention, the casing 13 is cemented to the walls of the well bore 11 through the central portion of the oil bearing formation 1 as indicated by the reference character 17. Thus, Ifor-mation 1 is in direct communication with the casing throughout the 11pper portion of the formation and the formation is in direct communication with tubing string `16 through the lower end portion of the formation.

Air mixed with hydrocarbon fuel is forced through conduit 15 downwardly through the annulus between the casing 13 and tubing 16 and outwardly into the upper portion of the formation 1. As the high pressure fuel and air mixture is supplied, combustion can then be initiated by any suitable means. The flame front resulting from the combustion is driven by air injection downwardly and outwardly through the formation 1 around the well bore in the directions indicated by the arrows. Also, the gases of combustion will be forced downwardly through the formations by the high pressure incoming fuel-air mixture and will enter tubing 16 to be carried to the surface.

As will be apparent, oil containing materials and oil entrained in formation 1 around the well bore will be moved and directed into the lower portion of the well bore by the heat of combustion together with the resultant gas drive and will be carried up the tubing string 16 together with the gases of combustion or can be removed by any desired articial lifting means. In some formations the amount and the pressure of the gas discharging into the lower portion of the well can be suhcient to provide removal of accumulated oil along with the combustion gases through the tubing.

Oil removed to the surface is separated from the combustion gases in separator 21. These gases are then sent by line 22 to a gas turbine 23 where they provide the energy to compress the air fed to the air compressor through line 26. To give economical operation of the gas turbine compressor combination the back pressure in line 22 is of the order of 15 to 100 p.s.i. Additional air can be admitted through line 27 from other compressors as needed. Fuel in the form of suitable hydrocarbon gases is introduced through line 2S and can be mixed if desired with compressed air coming through line 24 into the formation through line 15. The gas turbine can be started up by means of natural gas or other fuel admitted by line 28 and is vented through line 30.

In order that those skilled in the art may better understand how the present invention can be practiced, the following example is given by way of illustration. In-

itially, a well having a diameter of about 12 inches is drilled into an oil-shale deposit having a thickness of about 1000 feet, the top of the formation lying at a depth of about 1000 feet. In some instances it may be desirable to drill a bore hole having a diameter of the order of 4 feet. This will depend on the size and type of explosive to be employed. Generally holes in the range of 12" to 4 can be drilled with ordinarily available equipment.

In the oil-shale, which has a richness averaging about 25 gal. per ton, 1 ton of TNT is detonated to cause the initial fracturing and establish gas communication to the lower regions of the formation. The explosion will open up some permeability and allow the downward movement of a flame front.

Following the explosion (l ton equivalent), a 4" tubing string is placed to the bottom of the bore hole to serve as an internal exit pipe. Combustion is then initiated at the top of the formation. For approximately 20 days, 50,1000 cubic feet per minute of air mixed with 5 c.f./min. of 1000 B.t.u. gas is injected through the annulus between the exit pipe and the casing into the top of the formation with an inlet pressure of about 100 p.s.i.g. Thereafter, the 4 exit pipe is withdrawn and a second explosive charge is actuated in the formation.

The second explosive charge is preferably larger than the irst and in this example a charge of tons of TNT is employed. A suitable hole is drilled into the bottom of the formation and the 4 exit pipe is again placed as an exit pipe for the recovery of produced oil. Again combustion is initiated and for 40 days 100,000 c.f./min. of air with 10 c.f./min. of 1000 B.t.u. gas is injected into the upper portion of the formation.

Once again the 4" exit pipe is withdrawn and 100 tone of TNT is exploded in the central portion of the formation being produced. The explosion not only knocks down the peripheral layer of rock Skelton left in the cavity which has been formed but also brings about new fracturing of the formation. Combustion is initiated in the usual manner and a flame front moved downward through the newly fractured formation enlarging the chamber once more. This time 100,000 c.f./min. of air is injected with no fuel gas for a period of 40 days.

After the third explosion, and combustion steps, oil production begins to become significant and during the next 6010 days, 3000 barrels per day of oil can be produced by injecting 500,000 c.f./rnin. of air into the upper portion of the formation. This amounts to a total oil recovery by the 70th day of approximately 1.8 million barrels. During the same period, an average of 12 109 MM B.t.u./day of gas is available to run the gas turbines and auxiliary equipment at the surface.

Within the bituminous formation, combustion of air and shale or shale-oil vapors will reach local temperatures of about 1500 F. About 75% of the magnesium and calcium carbonates will be decomposed at these temperatures. Thus, the mass of the residual shale over and above the loss of about 10% by weight in the form of hydrocarbons will be substantially reduced by the carbon dioxide loss. In all, there will be approximately a 50% loss in mass within the portion of the formation exploited. Gases leaving the cavity will be at about 300 F. and will contain some oil in vapor form.

By the process described above, a cavity of roughly spherical dimensions will be created having a diameter of about 500 feet. This chamber can then be utilized according to this invention to explode an ultra-high energy explosive charge. While conventional explosives can be employed, it is preferable to utilize a thermonuclear device.

Any suitable atomic device such as a ssion or a fusion bomb known in the art can be used in accordance with the present invention. Suitable devices are those which release substantially all their available energy within not more than about 1 minute after the establishment of criticality by changes involving exoergic transformation. On the tiring of the 1-20 megaton device the release of energy creates an extremely high pressure within the bomb cavity which has been prepared. Almost immediately the roof of the cavity will collapse and fractured rock from above completely llls the explosion cavity forming a massive zone of fractured rock. Trapped heat from the explosion will raise the temperature of the shattered and crushed material from its original underground temperature of about F. to a temperature on the average which is in the order of 200 to 300 F. Thereafter, a single well is drilled into the fractured zone, casing is placed to the top of the zone, and a tubing string inside the casing is run to the bottom of the zone. Following this, a 50% mixture of saturated liquid and saturated vapor water at 700 F. and 3100 p.s.i. is injected through the casing of the well into the uppermost portion of the fractured zone. The steam and condensate is injected at a rate of approximately 2100 barrels per day for a period of time in the order of 3 years. Water and oil are produced through the tubing string from the bottom of the zone.

While in the foregoing, there has been shown and described the preferred embodiment of the present invention, it is to be understood that minor changes in details of construction, combination, and arrangement of parts may be resorted to without departing from the spirt and scope of the invention as claimed.

What is claimed is:

/1. A process ffor producing oil from a bituminous formation consisting essentially of an oil shale deposit containing appreciable amounts of calcium and magnesium carbonate depo-sits and containing hydrocarbons not naturally flofwable into a well bore traversing said formation, which comprises fracturing said formation adjacent said well bore by detonating a first explosive charge therein, initiating combustion in the upper portion of said [formation adjacent said well bore to establish a combustion front, injecting into said upper portion of said formation a combustion-supporting gas to move said combustion front downwardly and outwardly around said well bore and leave only a frail ash skeleton of rock in the wake of said combustion front, detonating a second explosive charge in said well bore to knock down said ash skeleton of rock, thereby forming a chamber and fractur-ing additional portions of said formation proximate said well bore substantially unaffected by said iirst explosion and said combustion, thereafter again establishing a combustion front in the upper portion of said formation, and moving said front downwardly through said formation and said chamber, wherein said combustion steps are carried out at temperatures up to about 1500" F., and removing to the surface from the lower portion .of said formation in said chamber oil produced by the combustion within said formation in said chamber.

2. The process of claim Il wherein said chamber is made larger by repeated explosion of increasingly larger explosive charges and thereafter fol-lowing each explosion, mowing a combustion front downwardly through the region fractured by the explosion.

3. A process for producing oil from a subsurface bituminous formation consisting essentially of an oil shale deposit containing appreciable amounts of calcium and magnesium carbonate deposits and containing hydrocarbons not naturally ilowable into a well bore penetrating said formation, which comprises creating within said formation an explosion chamber of approximately spherical dimensions having a diameter in the range of about 10 to 1500 feet, said explosion chamber being prepared by (l) drilling a well bore into said formation, (2) fractuning regions of said formation adjacent said Well bore by detonating an explosive charge within said well bore, (3) initiating combustion in the upper portion of the formation to establish a combustion front around said well bore, (4) injecting air into sa-id upper portion of said formation to move said combustion front downwardly through said formation leaving only a frail ash skeleton of rock in the wake of said combustion front, (S) then detonating a second explosive in said well bore shattering said ash skeleton of rock, thereby forming a cavity and producing additional fractures in said surrounding formation and again carrying out the combustion step, said combustion steps being carried out at temperatures up to about 1500 F., repeating this procedure until an explosion chamber of the desired size is obtained and (6) then detonating a high energy explosive in said explosion chamber rto form a massive fragmented zone within said formation and fill said chamber with fragments formed by said explosion, oodng said fragmented zone with Water at a temperature in the range of 550 to 800 F., and removing to the surface oil extracted from said zone by said Water.

4. The process according to claim 3 characterized further in that a single Well is drilled into said fractured zone with a casing set to the top olf said Zone and a pro- Iduc'tion tubing string Within said casing, set to the bottom portion of said zone, and said Water is injected into said zone 'through the annulus between `said Casing and said production tubing string.

5. The process according to claim 3 wherein said high energy explosive produces an underground explosion hav- 5% ing an energy yield equivalent to at least 0.1 kiloton of TNT.

6. The process according to claim 5 wherein said high energy explosive is a molecular explosive.

References Cited in the le of this patent UNITED STATES PATENTS 1,422,204 Hoover July 11, 1922 1,457,479 Wolcott June 5, 1923 2,780,449 Fisher Feb. 5, 1957 2,788,071 Pelzer Apr. 9, 1957 2,819,761 Popham et a1. Jan. 14, 1958 3,001,775 Allred Sept. 26, 1961 OTHER REFERENCES

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1422204 *Dec 19, 1919Jul 11, 1922Brown Thomas EMethod for working oil shales
US1457479 *Jan 12, 1920Jun 5, 1923Wolcott Edson RMethod of increasing the yield of oil wells
US2780449 *Dec 26, 1952Feb 5, 1957Sinclair Oil & Gas CoThermal process for in-situ decomposition of oil shale
US2788071 *Mar 5, 1954Apr 9, 1957Sinclair Oil & Gas CompanyOil recovery process
US2819761 *Jan 19, 1956Jan 14, 1958Continental Oil CoProcess of removing viscous oil from a well bore
US3001775 *Dec 8, 1958Sep 26, 1961Ohio Oil CompanyVertical flow process for in situ retorting of oil shale
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Citing PatentFiling datePublication dateApplicantTitle
US3283814 *Aug 7, 1962Nov 8, 1966Deutsche Erdoel AgProcess for deriving values from coal deposits
US3318378 *Mar 23, 1964May 9, 1967Coshow Chester LMethod of sealing vuggy regions in well bores
US3342257 *Dec 30, 1963Sep 19, 1967Standard Oil CoIn situ retorting of oil shale using nuclear energy
US3379248 *Dec 10, 1965Apr 23, 1968Mobil Oil CorpIn situ combustion process utilizing waste heat
US3404919 *May 4, 1966Oct 8, 1968Nuclear Proc CorpMethod of creating large diameter boreholes using underground nuclear detonations
US3409082 *Apr 20, 1964Nov 5, 1968Continental Oil CoProcess for stimulating petroliferous subterranean formations with contained nuclear explosions
US3451478 *Nov 1, 1965Jun 24, 1969Pan American Petroleum CorpNuclear fracturing and heating in water flooding
US3464490 *Aug 30, 1965Sep 2, 1969Pan American Petroleum CorpFormation nuclear fracturing process
US3465818 *Nov 7, 1967Sep 9, 1969American Oil Shale CorpUndercutting of nuclearly detonated formations by subsequent nuclear detonations at greater depth and uses thereof in the recovery of various minerals
US3465819 *Feb 13, 1967Sep 9, 1969American Oil Shale CorpUse of nuclear detonations in producing hydrocarbons from an underground formation
US3478825 *Aug 21, 1967Nov 18, 1969Shell Oil CoMethod of increasing the volume of a permeable zone within an oil shale formation
US3499489 *Mar 13, 1967Mar 10, 1970Phillips Petroleum CoProducing oil from nuclear-produced chimneys in oil shale
US3506069 *Sep 23, 1963Apr 14, 1970Richfield Oil CorpProcess for recovering petroleum utilizing a nuclear explosion
US3554283 *Nov 28, 1967Jan 12, 1971Abrams AlvinSitu recovery of petroleumlike hydrocarbons from underground formations
US3565171 *Oct 23, 1968Feb 23, 1971Shell Oil CoMethod for producing shale oil from a subterranean oil shale formation
US3593789 *Oct 18, 1968Jul 20, 1971Shell Oil CoMethod for producing shale oil from an oil shale formation
US3972372 *Mar 10, 1975Aug 3, 1976Fisher Sidney TExraction of hydrocarbons in situ from underground hydrocarbon deposits
US4036299 *Sep 22, 1975Jul 19, 1977Occidental Oil Shale, Inc.Enriching off gas from oil shale retort
US4089375 *May 13, 1977May 16, 1978Occidental Oil Shale, Inc.In situ retorting with water vaporized in situ
US4091869 *Sep 7, 1976May 30, 1978Exxon Production Research CompanyIn situ process for recovery of carbonaceous materials from subterranean deposits
US4109719 *Dec 5, 1977Aug 29, 1978Continental Oil CompanyMethod for creating a permeable fragmented zone within a subterranean carbonaceous deposit for in situ coal gasification
US4185693 *Jun 7, 1978Jan 29, 1980Conoco, Inc.Oil shale retorting from a high porosity cavern
US4202168 *Jul 18, 1978May 13, 1980Gulf Research & Development CompanyMethod for the recovery of power from LHV gas
US4202169 *Aug 3, 1978May 13, 1980Gulf Research & Development CompanySystem for combustion of gases of low heating value
US4273615 *Jul 17, 1978Jun 16, 1981Farrokh HirbodOil stimulation process
US4491179 *Apr 26, 1982Jan 1, 1985Pirson Sylvain JMethod for oil recovery by in situ exfoliation drive
US4886118 *Feb 17, 1988Dec 12, 1989Shell Oil CompanyConductively heating a subterranean oil shale to create permeability and subsequently produce oil
US6267182 *May 1, 1997Jul 31, 2001Petroleo Brasileiro S. A. - PetrobrasMethod and equipment for offshore oil production with primary gas separation and flow using the injection of high pressure gas
US6877555Apr 24, 2002Apr 12, 2005Shell Oil CompanyIn situ thermal processing of an oil shale formation while inhibiting coking
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US7357180Apr 22, 2005Apr 15, 2008Shell Oil CompanyInhibiting effects of sloughing in wellbores
US7360588Oct 17, 2006Apr 22, 2008Shell Oil CompanyThermal processes for subsurface formations
US7370704Apr 22, 2005May 13, 2008Shell Oil CompanyTriaxial temperature limited heater
US7383877Apr 22, 2005Jun 10, 2008Shell Oil CompanyTemperature limited heaters with thermally conductive fluid used to heat subsurface formations
US7424915Apr 22, 2005Sep 16, 2008Shell Oil CompanyVacuum pumping of conductor-in-conduit heaters
US7431076Apr 22, 2005Oct 7, 2008Shell Oil CompanyTemperature limited heaters using modulated DC power
US7435037Apr 21, 2006Oct 14, 2008Shell Oil CompanyLow temperature barriers with heat interceptor wells for in situ processes
US7461691Jan 23, 2007Dec 9, 2008Shell Oil CompanyIn situ recovery from a hydrocarbon containing formation
US7481274Apr 22, 2005Jan 27, 2009Shell Oil CompanyTemperature limited heaters with relatively constant current
US7490665Apr 22, 2005Feb 17, 2009Shell Oil CompanyVariable frequency temperature limited heaters
US7500528Apr 21, 2006Mar 10, 2009Shell Oil CompanyLow temperature barrier wellbores formed using water flushing
US7510000Apr 22, 2005Mar 31, 2009Shell Oil CompanyReducing viscosity of oil for production from a hydrocarbon containing formation
US7527094Apr 21, 2006May 5, 2009Shell Oil CompanyDouble barrier system for an in situ conversion process
US7533719Apr 20, 2007May 19, 2009Shell Oil CompanyWellhead with non-ferromagnetic materials
US7575052Apr 21, 2006Aug 18, 2009Shell Oil CompanyIn situ conversion process utilizing a closed loop heating system
US7575053Apr 21, 2006Aug 18, 2009Shell Oil CompanyLow temperature monitoring system for subsurface barriers
US7597147Apr 20, 2007Oct 6, 2009Shell Oil CompanyTemperature limited heaters using phase transformation of ferromagnetic material
US7631689Dec 15, 2009Shell Oil CompanySulfur barrier for use with in situ processes for treating formations
US7644765Oct 19, 2007Jan 12, 2010Shell Oil CompanyHeating tar sands formations while controlling pressure
US7673681Oct 19, 2007Mar 9, 2010Shell Oil CompanyTreating tar sands formations with karsted zones
US7673786Apr 20, 2007Mar 9, 2010Shell Oil CompanyWelding shield for coupling heaters
US7677310Oct 19, 2007Mar 16, 2010Shell Oil CompanyCreating and maintaining a gas cap in tar sands formations
US7677314Oct 19, 2007Mar 16, 2010Shell Oil CompanyMethod of condensing vaporized water in situ to treat tar sands formations
US7681647Mar 23, 2010Shell Oil CompanyMethod of producing drive fluid in situ in tar sands formations
US7683296Mar 23, 2010Shell Oil CompanyAdjusting alloy compositions for selected properties in temperature limited heaters
US7703513Oct 19, 2007Apr 27, 2010Shell Oil CompanyWax barrier for use with in situ processes for treating formations
US7717171Oct 19, 2007May 18, 2010Shell Oil CompanyMoving hydrocarbons through portions of tar sands formations with a fluid
US7730945Oct 19, 2007Jun 8, 2010Shell Oil CompanyUsing geothermal energy to heat a portion of a formation for an in situ heat treatment process
US7730946Oct 19, 2007Jun 8, 2010Shell Oil CompanyTreating tar sands formations with dolomite
US7730947Oct 19, 2007Jun 8, 2010Shell Oil CompanyCreating fluid injectivity in tar sands formations
US7735935Jun 1, 2007Jun 15, 2010Shell Oil CompanyIn situ thermal processing of an oil shale formation containing carbonate minerals
US7785427Apr 20, 2007Aug 31, 2010Shell Oil CompanyHigh strength alloys
US7793722Apr 20, 2007Sep 14, 2010Shell Oil CompanyNon-ferromagnetic overburden casing
US7798220Apr 18, 2008Sep 21, 2010Shell Oil CompanyIn situ heat treatment of a tar sands formation after drive process treatment
US7831134Apr 21, 2006Nov 9, 2010Shell Oil CompanyGrouped exposed metal heaters
US7832484Apr 18, 2008Nov 16, 2010Shell Oil CompanyMolten salt as a heat transfer fluid for heating a subsurface formation
US7841401Oct 19, 2007Nov 30, 2010Shell Oil CompanyGas injection to inhibit migration during an in situ heat treatment process
US7841408Apr 18, 2008Nov 30, 2010Shell Oil CompanyIn situ heat treatment from multiple layers of a tar sands formation
US7841425Nov 30, 2010Shell Oil CompanyDrilling subsurface wellbores with cutting structures
US7845411Dec 7, 2010Shell Oil CompanyIn situ heat treatment process utilizing a closed loop heating system
US7849922Dec 14, 2010Shell Oil CompanyIn situ recovery from residually heated sections in a hydrocarbon containing formation
US7860377Apr 21, 2006Dec 28, 2010Shell Oil CompanySubsurface connection methods for subsurface heaters
US7866385Apr 20, 2007Jan 11, 2011Shell Oil CompanyPower systems utilizing the heat of produced formation fluid
US7866386Oct 13, 2008Jan 11, 2011Shell Oil CompanyIn situ oxidation of subsurface formations
US7866388Jan 11, 2011Shell Oil CompanyHigh temperature methods for forming oxidizer fuel
US7912358Apr 20, 2007Mar 22, 2011Shell Oil CompanyAlternate energy source usage for in situ heat treatment processes
US7931086Apr 18, 2008Apr 26, 2011Shell Oil CompanyHeating systems for heating subsurface formations
US7942197Apr 21, 2006May 17, 2011Shell Oil CompanyMethods and systems for producing fluid from an in situ conversion process
US7942203May 17, 2011Shell Oil CompanyThermal processes for subsurface formations
US7950453Apr 18, 2008May 31, 2011Shell Oil CompanyDownhole burner systems and methods for heating subsurface formations
US7986869Apr 21, 2006Jul 26, 2011Shell Oil CompanyVarying properties along lengths of temperature limited heaters
US8011451Sep 6, 2011Shell Oil CompanyRanging methods for developing wellbores in subsurface formations
US8027571Sep 27, 2011Shell Oil CompanyIn situ conversion process systems utilizing wellbores in at least two regions of a formation
US8042610Oct 25, 2011Shell Oil CompanyParallel heater system for subsurface formations
US8070840Apr 21, 2006Dec 6, 2011Shell Oil CompanyTreatment of gas from an in situ conversion process
US8083813Dec 27, 2011Shell Oil CompanyMethods of producing transportation fuel
US8113272Oct 13, 2008Feb 14, 2012Shell Oil CompanyThree-phase heaters with common overburden sections for heating subsurface formations
US8146661Oct 13, 2008Apr 3, 2012Shell Oil CompanyCryogenic treatment of gas
US8146669Oct 13, 2008Apr 3, 2012Shell Oil CompanyMulti-step heater deployment in a subsurface formation
US8151880Dec 9, 2010Apr 10, 2012Shell Oil CompanyMethods of making transportation fuel
US8151907Apr 10, 2009Apr 10, 2012Shell Oil CompanyDual motor systems and non-rotating sensors for use in developing wellbores in subsurface formations
US8162059Apr 24, 2012Shell Oil CompanyInduction heaters used to heat subsurface formations
US8162405Apr 24, 2012Shell Oil CompanyUsing tunnels for treating subsurface hydrocarbon containing formations
US8172335May 8, 2012Shell Oil CompanyElectrical current flow between tunnels for use in heating subsurface hydrocarbon containing formations
US8177305Apr 10, 2009May 15, 2012Shell Oil CompanyHeater connections in mines and tunnels for use in treating subsurface hydrocarbon containing formations
US8191630Apr 28, 2010Jun 5, 2012Shell Oil CompanyCreating fluid injectivity in tar sands formations
US8192682Apr 26, 2010Jun 5, 2012Shell Oil CompanyHigh strength alloys
US8196658Jun 12, 2012Shell Oil CompanyIrregular spacing of heat sources for treating hydrocarbon containing formations
US8220539Jul 17, 2012Shell Oil CompanyControlling hydrogen pressure in self-regulating nuclear reactors used to treat a subsurface formation
US8224163Oct 24, 2003Jul 17, 2012Shell Oil CompanyVariable frequency temperature limited heaters
US8224164Oct 24, 2003Jul 17, 2012Shell Oil CompanyInsulated conductor temperature limited heaters
US8224165Jul 17, 2012Shell Oil CompanyTemperature limited heater utilizing non-ferromagnetic conductor
US8225866Jul 21, 2010Jul 24, 2012Shell Oil CompanyIn situ recovery from a hydrocarbon containing formation
US8230927May 16, 2011Jul 31, 2012Shell Oil CompanyMethods and systems for producing fluid from an in situ conversion process
US8233782Jul 31, 2012Shell Oil CompanyGrouped exposed metal heaters
US8238730Aug 7, 2012Shell Oil CompanyHigh voltage temperature limited heaters
US8240774Aug 14, 2012Shell Oil CompanySolution mining and in situ treatment of nahcolite beds
US8256512Oct 9, 2009Sep 4, 2012Shell Oil CompanyMovable heaters for treating subsurface hydrocarbon containing formations
US8261832Sep 11, 2012Shell Oil CompanyHeating subsurface formations with fluids
US8267170Sep 18, 2012Shell Oil CompanyOffset barrier wells in subsurface formations
US8267185Sep 18, 2012Shell Oil CompanyCirculated heated transfer fluid systems used to treat a subsurface formation
US8272455Sep 25, 2012Shell Oil CompanyMethods for forming wellbores in heated formations
US8276661Oct 2, 2012Shell Oil CompanyHeating subsurface formations by oxidizing fuel on a fuel carrier
US8281861Oct 9, 2012Shell Oil CompanyCirculated heated transfer fluid heating of subsurface hydrocarbon formations
US8327681Dec 11, 2012Shell Oil CompanyWellbore manufacturing processes for in situ heat treatment processes
US8327932Apr 9, 2010Dec 11, 2012Shell Oil CompanyRecovering energy from a subsurface formation
US8353347Oct 9, 2009Jan 15, 2013Shell Oil CompanyDeployment of insulated conductors for treating subsurface formations
US8355623Jan 15, 2013Shell Oil CompanyTemperature limited heaters with high power factors
US8381815Apr 18, 2008Feb 26, 2013Shell Oil CompanyProduction from multiple zones of a tar sands formation
US8434555Apr 9, 2010May 7, 2013Shell Oil CompanyIrregular pattern treatment of a subsurface formation
US8448707May 28, 2013Shell Oil CompanyNon-conducting heater casings
US8459359Apr 18, 2008Jun 11, 2013Shell Oil CompanyTreating nahcolite containing formations and saline zones
US8485252Jul 11, 2012Jul 16, 2013Shell Oil CompanyIn situ recovery from a hydrocarbon containing formation
US8536497Oct 13, 2008Sep 17, 2013Shell Oil CompanyMethods for forming long subsurface heaters
US8555971May 31, 2012Oct 15, 2013Shell Oil CompanyTreating tar sands formations with dolomite
US8562078Nov 25, 2009Oct 22, 2013Shell Oil CompanyHydrocarbon production from mines and tunnels used in treating subsurface hydrocarbon containing formations
US8579031May 17, 2011Nov 12, 2013Shell Oil CompanyThermal processes for subsurface formations
US8606091Oct 20, 2006Dec 10, 2013Shell Oil CompanySubsurface heaters with low sulfidation rates
US8608249Apr 26, 2010Dec 17, 2013Shell Oil CompanyIn situ thermal processing of an oil shale formation
US8627887Dec 8, 2008Jan 14, 2014Shell Oil CompanyIn situ recovery from a hydrocarbon containing formation
US8631866Apr 8, 2011Jan 21, 2014Shell Oil CompanyLeak detection in circulated fluid systems for heating subsurface formations
US8636323Nov 25, 2009Jan 28, 2014Shell Oil CompanyMines and tunnels for use in treating subsurface hydrocarbon containing formations
US8662175Apr 18, 2008Mar 4, 2014Shell Oil CompanyVarying properties of in situ heat treatment of a tar sands formation based on assessed viscosities
US8701768Apr 8, 2011Apr 22, 2014Shell Oil CompanyMethods for treating hydrocarbon formations
US8701769Apr 8, 2011Apr 22, 2014Shell Oil CompanyMethods for treating hydrocarbon formations based on geology
US8739874Apr 8, 2011Jun 3, 2014Shell Oil CompanyMethods for heating with slots in hydrocarbon formations
US8752904Apr 10, 2009Jun 17, 2014Shell Oil CompanyHeated fluid flow in mines and tunnels used in heating subsurface hydrocarbon containing formations
US8789586Jul 12, 2013Jul 29, 2014Shell Oil CompanyIn situ recovery from a hydrocarbon containing formation
US8791396Apr 18, 2008Jul 29, 2014Shell Oil CompanyFloating insulated conductors for heating subsurface formations
US8820406Apr 8, 2011Sep 2, 2014Shell Oil CompanyElectrodes for electrical current flow heating of subsurface formations with conductive material in wellbore
US8833453Apr 8, 2011Sep 16, 2014Shell Oil CompanyElectrodes for electrical current flow heating of subsurface formations with tapered copper thickness
US8851170Apr 9, 2010Oct 7, 2014Shell Oil CompanyHeater assisted fluid treatment of a subsurface formation
US8857506May 24, 2013Oct 14, 2014Shell Oil CompanyAlternate energy source usage methods for in situ heat treatment processes
US8881806Oct 9, 2009Nov 11, 2014Shell Oil CompanySystems and methods for treating a subsurface formation with electrical conductors
US9016370Apr 6, 2012Apr 28, 2015Shell Oil CompanyPartial solution mining of hydrocarbon containing layers prior to in situ heat treatment
US9022109Jan 21, 2014May 5, 2015Shell Oil CompanyLeak detection in circulated fluid systems for heating subsurface formations
US9022118Oct 9, 2009May 5, 2015Shell Oil CompanyDouble insulated heaters for treating subsurface formations
US9033042Apr 8, 2011May 19, 2015Shell Oil CompanyForming bitumen barriers in subsurface hydrocarbon formations
US9051829Oct 9, 2009Jun 9, 2015Shell Oil CompanyPerforated electrical conductors for treating subsurface formations
US9103193Nov 14, 2014Aug 11, 2015Evolution Well Services, LlcMobile, modular, electrically powered system for use in fracturing underground formations
US9121257Nov 14, 2014Sep 1, 2015Evolution Well Services, LlcMobile, modular, electrically powered system for use in fracturing underground formations
US9127523Apr 8, 2011Sep 8, 2015Shell Oil CompanyBarrier methods for use in subsurface hydrocarbon formations
US9127538Apr 8, 2011Sep 8, 2015Shell Oil CompanyMethodologies for treatment of hydrocarbon formations using staged pyrolyzation
US9129728Oct 9, 2009Sep 8, 2015Shell Oil CompanySystems and methods of forming subsurface wellbores
US9140110Mar 14, 2013Sep 22, 2015Evolution Well Services, LlcMobile, modular, electrically powered system for use in fracturing underground formations using liquid petroleum gas
US9181780Apr 18, 2008Nov 10, 2015Shell Oil CompanyControlling and assessing pressure conditions during treatment of tar sands formations
US9309755Oct 4, 2012Apr 12, 2016Shell Oil CompanyThermal expansion accommodation for circulated fluid systems used to heat subsurface formations
US9366114Apr 6, 2012Jun 14, 2016Evolution Well Services, LlcMobile, modular, electrically powered system for use in fracturing underground formations
US20030079877 *Apr 24, 2002May 1, 2003Wellington Scott LeeIn situ thermal processing of a relatively impermeable formation in a reducing environment
US20030080604 *Apr 24, 2002May 1, 2003Vinegar Harold J.In situ thermal processing and inhibiting migration of fluids into or out of an in situ oil shale formation
US20030098149 *Apr 24, 2002May 29, 2003Wellington Scott LeeIn situ thermal recovery from a relatively permeable formation using gas to increase mobility
US20030098605 *Apr 24, 2002May 29, 2003Vinegar Harold J.In situ thermal recovery from a relatively permeable formation
US20030102126 *Apr 24, 2002Jun 5, 2003Sumnu-Dindoruk Meliha DenizIn situ thermal recovery from a relatively permeable formation with controlled production rate
US20030111223 *Apr 24, 2002Jun 19, 2003Rouffignac Eric Pierre DeIn situ thermal processing of an oil shale formation using horizontal heat sources
US20030116315 *Apr 24, 2002Jun 26, 2003Wellington Scott LeeIn situ thermal processing of a relatively permeable formation
US20030131993 *Apr 24, 2002Jul 17, 2003Etuan ZhangIn situ thermal processing of an oil shale formation with a selected property
US20030131995 *Apr 24, 2002Jul 17, 2003De Rouffignac Eric PierreIn situ thermal processing of a relatively impermeable formation to increase permeability of the formation
US20030131996 *Apr 24, 2002Jul 17, 2003Vinegar Harold J.In situ thermal processing of an oil shale formation having permeable and impermeable sections
US20030136558 *Apr 24, 2002Jul 24, 2003Wellington Scott LeeIn situ thermal processing of an oil shale formation to produce a desired product
US20030136559 *Apr 24, 2002Jul 24, 2003Wellington Scott LeeIn situ thermal processing while controlling pressure in an oil shale formation
US20030141066 *Apr 24, 2002Jul 31, 2003Karanikas John MichaelIn situ thermal processing of an oil shale formation while inhibiting coking
US20030141067 *Apr 24, 2002Jul 31, 2003Rouffignac Eric Pierre DeIn situ thermal processing of an oil shale formation to increase permeability of the formation
US20030141068 *Apr 24, 2002Jul 31, 2003Pierre De Rouffignac EricIn situ thermal processing through an open wellbore in an oil shale formation
US20030142964 *Apr 24, 2002Jul 31, 2003Wellington Scott LeeIn situ thermal processing of an oil shale formation using a controlled heating rate
US20030146002 *Apr 24, 2002Aug 7, 2003Vinegar Harold J.Removable heat sources for in situ thermal processing of an oil shale formation
US20030164239 *Apr 24, 2002Sep 4, 2003Wellington Scott LeeIn situ thermal processing of an oil shale formation in a reducing environment
US20030173081 *Oct 24, 2002Sep 18, 2003Vinegar Harold J.In situ thermal processing of an oil reservoir formation
US20030173085 *Oct 24, 2002Sep 18, 2003Vinegar Harold J.Upgrading and mining of coal
US20030196810 *Oct 24, 2002Oct 23, 2003Vinegar Harold J.Treatment of a hydrocarbon containing formation after heating
US20030201098 *Oct 24, 2002Oct 30, 2003Karanikas John MichaelIn situ recovery from a hydrocarbon containing formation using one or more simulations
US20040040715 *Oct 24, 2002Mar 4, 2004Wellington Scott LeeIn situ production of a blending agent from a hydrocarbon containing formation
US20040211554 *Apr 24, 2002Oct 28, 2004Vinegar Harold J.Heat sources with conductive material for in situ thermal processing of an oil shale formation
US20040211557 *Apr 24, 2002Oct 28, 2004Cole Anthony ThomasConductor-in-conduit heat sources for in situ thermal processing of an oil shale formation
US20050092483 *Oct 24, 2002May 5, 2005Vinegar Harold J.In situ thermal processing of a hydrocarbon containing formation using a natural distributed combustor
US20060230760 *May 8, 2006Oct 19, 2006Hendershot William BSelf-sustaining on-site production of electricity utilizing oil shale and/or oil sands deposits
US20070045265 *Apr 21, 2006Mar 1, 2007Mckinzie Billy J IiLow temperature barriers with heat interceptor wells for in situ processes
US20070137856 *Apr 21, 2006Jun 21, 2007Mckinzie Billy JDouble barrier system for an in situ conversion process
Classifications
U.S. Classification166/257, 166/247, 166/259, 376/275
International ClassificationE21B43/263, E21B43/25
Cooperative ClassificationE21B43/2635
European ClassificationE21B43/263F