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Publication numberUS3502372 A
Publication typeGrant
Publication dateMar 24, 1970
Filing dateOct 23, 1968
Priority dateOct 23, 1968
Publication numberUS 3502372 A, US 3502372A, US-A-3502372, US3502372 A, US3502372A
InventorsPrats Michael
Original AssigneeShell Oil Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Process of recovering oil and dawsonite from oil shale
US 3502372 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

March 24, 1970 M. PRATS 3,502,372

PROCESS OF RECOVERING OIL AND DAWSONITE FROM OIL SHALE Filed 001;. 23, 1968 INVENTOR:

M. PRATS AG NT United States Patent US. Cl. 299-5 8 Claims ABSTRACT OF THE DISCLOSURE A method of shale oil and dawsonite recovery from dawsonite-containing oil shale formations utilizing sequentially an in situ pyrolysis technique for shale oil recovery and solution mining for dawsonite recovery. The pyrolysis is controlled to prevent conversion of the dawsonite to insoluble oxides.

BACKGROUND OF THE INVENTION Field of the invention This invention relates to a new, novel and improved method for recovering both shale oil and dawsonite from subterranean oil shale formations containing both products by sequential treatment of fracture-permeated zones, such as rubblized caverns and/or fragmented portions of such formations produced by suitable fracturing and/ or solids-extracting means, to a controlled in situ pyrolysis, in order to pyrolize the organic components into fluid or fluidizable and recoverable oil products and thereafter injecting into the oil depleted area containing therein dawsonite an aqueous liquid capable of dissolving the daJwsonite and recovering the dissolved dawsonite from the recovered liquid by any suitable means.

The use of various explosive techniques both nuclear and non-nuclear to rubblize or break-up or fragment underground oil shale formations so as to form a chimney or cavern filled with rubble or fragmented oil shale to facilitate shale oil recovery from such fragmented or rubblized areas by in situ pyrolysis is well known in the art. Although some oil shale formations under discussion are known to also contain dawsonite and/or other soluble aluminum compounds, their recovrey in conjunction with in situ pyrolysis of shale oil recovery, or per se, has not been thought feasible in the past because of the temperature conditions encountered which generally result in the fromation of insoluble oxides or aluminum making dawsonite (sodium aluminum carbonate) or other soluble aluminum compound recovery impossible or very costly and unattractive. Therefore, attempts to recover dawsonite from oil shale formations have not been attempted and a valuable source of aluminum and aluminum products has been essentially neglected.

OBJECTS OF THE INVENTION It is an object of the invention to recover soluble aluminum compounds from underground oil shale formations.

It is another object of this invention to sequentially recover shale oil and dawsonite from underground oil shale formations.

It is still another object of this invention to sequentially recover shale oil and dawsonite from underground rubblized or fragmented oil shale formations using in situ combustion or pyrolysis techniques and solution mining techniques for recovering oil and soluble aluminum compounds, respectively, from dawsonite-containing oil shale formations.

Other objects of this invention will be apparent from the following description.

SUMMARY OF THE INVENTION The present invention is directed to recovery of shale oil and soluble aluminum compounds such as dawsonite from underground dawsonite-containing oil shale formations by sequential treatment of such formations to effect pyrolysis of the organic matter, preferably by in situ combustion thereby recovering oil therefrom and subsequently subjecting the formation to solution mining to recover the dawsonite by means of aqueous solutions capable of dissolving the dawsonite and effecting above ground the separation of the dawsonite from the solution by any suitable means known to the art.

To effect and facilitate this recovery process of both oil and soluble aluminum compounds such as dawsonite, the formation containing these materials should be fragmented or rubblized, for example, by means Well known in the art, prior to treating or injecting sequentially into the resulting fracture-permeated zone of the formation a kerogen-pyrolyzing fluid and an aqueous solution capable of dissolving therein the soluble aluminum compounds such as dawsonite.

In order to accomplish the recovery of both the oil and dawsonite from dawsonite-containing oil shale formations most efficiently, it has been found that it is essential to control the pyrolyzing fluid temperature and/ or composition within specified limits so as to effect desired oil recovery while preventing the decomposition of the dawsonite or other soluble aluminum compounds into an insoluble oxide. To accomplish this the fracture-permeated zone of the oil shale formation is treated under controlled conditions by:

(1) Flowing into the recovery zone hot oil-shale pyrolyzing fluid having a pH of less than about 8 and a temperature above the formation temperature (and preferably above about 500 F.) through portions of a fracturepermeated oil shale that contains an aqueous fluid soluble aluminum compound, such as dawsonite, so that organic components of pyrolyzed oil shale are entrained and displaced by the oil-shale-pyrolyzed fluid;

(2) Flowing aqueous liquid into contact with oil shale from which organic components have been removed by said oil-shale-pyrolyzing fluid, so that aluminum-containing mineral components, such as dawsonite, are dissolved in the aqueous liquid; and

(3) Recovering oil and aluminum from fluids produced from the said fluid-contacted oil shale.

The oil-shale-pyrolyzing fluid can comprise the combustion products of substantially any type of in situ combustion in which the combustion-supporting fluid is sufliciently free of alkaline material to form non-alkaline combustion products, hot hydrocarbons such as benzene, volatile compounds of oil shale, steam or hot aqueous non-alkaline fluids, phenolic materials, mixtures of hydrocarbons with phenols, polyacids or the like, etc.

BRIEF DESCRIPTION OF THE DRAWING The figure schematically drawn shows a rubblized or fragmented or fractured chimney formed area of an underground oil shale formation that contains inorganic soluble aluminum compounds, such as dawsonite, penetrated by wells through which, sequentially, (a) pyrolyzing fluids are injected to effect recovery of organic components such as oil and (b) aqueous liquids or solutions are injected to effect dissolution of the inorganic materials, such as dawsonite, and recovering both products from one or more production wells.

DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in the drawing a dawsonite-containing oil shale 26 has been rubbelizing, fragmented or fractured to form a nuclear detonation cavern or chirrmey 27 which contains fragmented oil shale and which has been conditioned by gravel packing 20 to normalize permeability so as to effect efficient pyrolysis when injecting a pyrolysis fluid through tubing string 12 in well 11 which is within the chimney 27. Well 11 contains perforations 24 in addition to tubing string 12 which has been suspended therein, temperature-sensing devices 13 and packing 14. The pyrolyzing fluid injected via tubing string 12 enters the formation via perforations 24 and penetrates through the gravel pack 20, to establish a combustion front or zone 21. As the combustion front 21 proceeds downward under controlled conditions a pyrolyzing zone 25 is established from which oil can be recovered via well 15 which contains a tubing string 16 and pump 17. At a desired time combustion and oil recovery are stopped and an aqueous liquid is injected into the formation 22 via well 15 and/ or 1 8 in an amount suflicient to form a liquid filled zone 22 so as to dissolve dawsonite and recover it as a solution via tubing string 19 and/or 16. Solidified impermeable material is shown by numeral 23. The process of establishing a combustion zone by injection of a pyrolysis fluid and subsequently injecting an aqueous liquid to dissolve dawsonite and recovering both products is repeated in cycles until the area is worked over and depleted of these materials.

In order to obtain a relatively rapid rate of operation the combustion zone or front 21 should be within a temperature range of about 800 F. to about 1000" F. and the pyrolyzing zone 25 should be between about 600 F. and about 950 F. Also, the aqueous liquid used to dissolve the inorganic mineral, namely dawsonite, can be an alkaline solution preferably having a pH of at least about 10.

The widely varying permeabilities of the fragmented and fractured oil shale that is formed, for example, within a nuclear detonation chimney, can be normalized by forming a permeability-normalizing layer by forming a gravel pack across the top of the fragmented oil shale as described in my copending patent application Ser. No. 768,666, filed Oct. 16, 1968 or by any other suitable means. Thus, to produce shale oil from. a subterranean oil shale by means of in situ combustion the zone from which the oil is to be recovered may be treated by exploding a relatively high energy explosive device within the oil shale formation thereby forming a fragmented zone having the configuration as shown in the figure with a void space at the top of the zone which is filled with a layer of granular material for permeability adjustment. The combustion front is initiated by injecting via tubing string 12 a pyrolyzable fluid such as air, oxygen or a mixture of oxygen-containing gas and an aqueous liquid near the upper end of the granular filled fragmented zone so as to advance a combustion front down the zone and as it advances downward producing oil shale pyrolysis products. Preferably, the oil shale is pyrolyzed by injecting a mixture of air and water above a permeability-normalizing layer in order to advance a combustion front down through the chimney.

It is important that the ratio of water to air and the flow rate and pressure of the oxygen-containing mixture be controlled to avoid overheating portions of oil shale that contain water soluble mineral components, such as dawsonite, before they are contacted with an alkaline aqueous liquid. When such minerals are overheated they tend to be converted to insoluble oxides. The dawsonitecontaining portions of oil shale can be heated in contact with liquid, with liquid having a pH below about 7 at substantially any oil shale pyrolysis so that most of the organic components are removed and the dawsonite is exposed to contact with an aqueous liquid in which it is soluble.

Various types of procedures and equipment are available for monitoring the location of the combustion front and the temperatures being generated. As shown in the figure, a borehole 11 is extended through the fragmented oil shale, plugged at a lower level 14, perforated at an upper level 24, and used to inject a combustion-supporting fluid or a tubing string 12 into the chimney and to convey measuring elements, such as temperature-sensing devices 13, into the zones of interest. Alternatively, the temperatures being generated can be controlled by other procedures, such as subjecting samples of the oil shale to various combustion conditions and using the conditions that are productive of the selected temperatures and rates of combustion front advance, etc.

When a zone of dawsonite-containing oil shale has been contacted by hot fluid for a time sufficient to remove a substantial portion of the organic material, the injection of such a fluid is temporarily interrupted and aqueous liquid is flowed into contact with the pyrolyzed oil shale. One way of doing this, which is shown in the figure, utilizes a series of wells 15 and 18 drilled so that substantially horizontal portions of wells traverse the chimney at different depths. In using such wells, the lower portions of the cavern can be kept filled with a relatively dense and low-cost liquid such as water as shown by 22. During the advancing of the combustion front, the boreholes extending into the lower regions can be closed and fluids inclusive of combustion products, petroleum, and aqueous solutions of minerals can be produced, preferably with the aid of a pump, from one or more upper Wells that traverse the chimney below the location of the combustion front.

When a dawsonite-containing zone has been pyrolyzed, the combustion-supporting fluid injection is interrupted and aqueous liquid is injected into the pyrolyzed oil shale. This fluid can be injected through either the production well 15 or through the injection well 18, during an interruption of the injection of combustion-supporting fluids. During the aqueous liquid injection, combustionsupporting fluids can be produced from the permeable zone to the extent desirable to prevent the overpressuring of the cavern. The aqueous liquid which is injected to dissolve minerals is preferably an alkaline solution having a pH of at least about 10 and includes sodium hydroxide, calcium oxide solutions, lime solutions etc. The resulting aqueous liquid solution of minerals (dawsonite) is produced from the production well and the injection of combustion fluid is reinitiated.

A preferred feature of the present invention resides in the discovery that the addition of saturated calcium hydroxide solution to a sodium hydroxide solution greatly increased the effectiveness of aqueous alkaline solutions for extracting aluminum from dawsonite bearing oil shales.

An equimolar solution of saturated calcium hydroxide and sodium hydroxide has been found will extract approximately 600% more dawsonite aluminum than a solution of sodium hydroxide of the same alkalinity. It has been found that the aluminum concentrations of eflluent alkaline solutions are initially quite high when sodium hydroxide solution is flowed through crushed oil shale but fell off rapidly with increased flow and time. Conversely, the aluminum concentration of the calcium hydroxide-sodium hydroxide solution is quite small initially but continually increases with time. The pH of these eflluent solutions varied in the same manner as the aluminum concentration of the effluent; i.e., low aluminum concentrationlow pH. Since the idealized chemical reaction is between the dawsonite and hydroxide ion, a process which maintains a high pH is more efficient.

Also, important in the recovery of dawsonite aluminum is the need for preheating the raw shale. Experiments have shown that without preheating aluminum extraction by aqueous alkaline solutions is virtually impossible. Furthermore, the amount of preheating is significant. Aluminum recovery from an oil shale preheated for 5 days was four times greater than that from the same shale preheated for 2 days.

In no instance should the heated shale be contacted with an aqueous phase at temperatures above 175 C. (350 F.). Above this temperature, an insoluble aluminum silicate, analcite, is rapidly formed and recovery of the aluminum is not possible.

Generally, the in-situ combustion can be reinitiated when the oxygen injection is resumed and the combustion-supporting fluid contacts the hot oil shale. The combustion can be reinitiated by known procedures and the combustion front advanced through the permeable zone from which the soluble minerals have been extracted so as to produce additional shale oil from this regiomand to preheat a region further downstream as well, from which the desired minerals can then be extracted as described above. The steps of the process are repeated in sequence until both the oil and the soluble minerals are essentially completely recovered.

When the location of the combustion front has approached the borehole of an upper production well, that well can be shut-in. When one or more upper wells is shutin, the combustion-drive and solution-mining operations are conducted through one or more lower wells.

The well patterns, oil-shale-pyrolyzing procedures, and solution-mining procedures can be varied widely. For example, in place of, or in addition to, using the permeabilty-normalizing barrier, a relatively uniform advance of the combustion front can be obtained by the process as described in copending patent application Ser. No. 689,- 181, filed Dec. 8, 1967, now Patent No. 3,448,807, and comprises advancing the combustion front by injecting a foamed mixture of air and water. One or more plural completion wells can be used for the injection and production wells. The oil shale can be pyrolyzed by injecting gas heated to oil-shale pyrolyzing temperatures at a surface location or a location other than the chimney, etc. Thus, the combustion front can be controlled at a temperature high enough to permit oxidation of the residual hydrocarbons within the formation at a relative high rate without generating excessive temperatures by injecting a quantity of water into the formation through the injection well cocurrently with the injection of the combustionsupporting gas. A surface-active foaming material is mixed with the gas and water so as to move the gas and water through the formation in the form of a foam. The foam keeps the water mixed with the gas and thus, even in reservoirs where segregation occurs due to the oil becoming thermally mobilized and settling below the incoming combustion-supporting gas upstream of the combustion front, keeps the combustion from attaining the high temperature of dry combustion that would be attained if the water and gas were not converted into foam.

The foregoing description of the invention is merely intended to be explanatory thereof. Various changes in the details of the described method may be made within the scope of the appended claims without departing from the spirit of the invention.

I claim as my invention:

1. In a method of producing shale oil and soluble aluminum compounds from subterranean soluble aluminumcontaining oil shale formation comprising the steps of:

creating a ru-bblized or fragmented oil shale in said formation cavity; flowing into the top of the rubblized cavity a combustion-supporting fluid, establishing a combustion front, and directing the flow of the established combustion front in a downward direction while controlled temperature conditions in said cavity to effect recovery of hydrocarbons and said oil-shale-pyrolyzing fluid without danaging the chemical standard composition of the soluble aluminum compound;

flowing an aqueous liquid into the pyrolyzed area from which the pyrolyzed fluid has been removed, in an mount sufiicient to dissolve the soluble aluminum compound; and

recovering the soluble aluminum compounds from the liquid.

2. The method of claim 1 wherein the aluminum compound is dawsonite.

3. The method of claim 2 wherein the fluid recovered by the combustion treatment is shale oil and the aqueous liquid used to dissolve the drawsonite is an aqueous a1- kaline liquid having a pH of at least about 10.

4. The method of claim 3 wherein the oil shale is pyrolyzed by injecting therein a mixture of air and water and maintaining the pyrolyzing zone between 600 F. and 950 F.

5. The method of claim 4 wherein the combustion mixure is maintained as a foamed mixture of air and water.

6. The method of claim 3 wherein the aqueous a1- kaline liquid is an aqueous solution containing a mixture 7 of alkali metal and alkaline earth metal hydroxides.

7. The method of claim 6 wherein the hydroxides are sodium and calcium hydroxides, respectively.

8. The method of claim 2 wherein the si-situ combustion for oil recovery and aqueous liquid dissolution of the dawsonite is sequentially repeated.

References Cited UNITED STATES PATENTS 2,780,449 2/1957 Fisher et a1. 166-259 2,954,218 9/1960 Dew et al 2995 X 3,001,775 9/1961 Allred 166259 X 3,322,194 5/1967 Strubhar 166-259 3,404,919 10/1968 Dixon 166-247 CHARLES E. OCONNELL, Primary Examiner.

IAN A. CALVERT, Assistant Examiner US. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2780449 *Dec 26, 1952Feb 5, 1957Sinclair Oil & Gas CoThermal process for in-situ decomposition of oil shale
US2954218 *Dec 17, 1956Sep 27, 1960Continental Oil CoIn situ roasting and leaching of uranium ores
US3001775 *Dec 8, 1958Sep 26, 1961Ohio Oil CompanyVertical flow process for in situ retorting of oil shale
US3322194 *Mar 25, 1965May 30, 1967Mobil Oil CorpIn-place retorting of oil shale
US3404919 *May 4, 1966Oct 8, 1968Nuclear Proc CorpMethod of creating large diameter boreholes using underground nuclear detonations
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Citing PatentFiling datePublication dateApplicantTitle
US3572838 *Jul 7, 1969Mar 30, 1971Shell Oil CoRecovery of aluminum compounds and oil from oil shale formations
US3620301 *Apr 13, 1970Nov 16, 1971Mobil Oil CorpMethod of in-situ-retorting oil shale
US3661423 *Feb 12, 1970May 9, 1972Occidental Petroleum CorpIn situ process for recovery of carbonaceous materials from subterranean deposits
US3700280 *Apr 28, 1971Oct 24, 1972Shell Oil CoMethod of producing oil from an oil shale formation containing nahcolite and dawsonite
US3753594 *Sep 24, 1970Aug 21, 1973Shell Oil CoMethod of producing hydrocarbons from an oil shale formation containing halite
US3759574 *Sep 24, 1970Sep 18, 1973Shell Oil CoMethod of producing hydrocarbons from an oil shale formation
US3765722 *Aug 2, 1971Oct 16, 1973Continental Oil CoMethod for recovering petroleum products or the like from subterranean mineral deposits
US3779601 *Sep 24, 1970Dec 18, 1973Shell Oil CoMethod of producing hydrocarbons from an oil shale formation containing nahcolite
US4059308 *Nov 15, 1976Nov 22, 1977Trw Inc.Pressure swing recovery system for oil shale deposits
US4065183 *Nov 15, 1976Dec 27, 1977Trw Inc.Recovery system for oil shale deposits
US4072191 *Sep 21, 1976Feb 7, 1978Phillips Petroleum CompanyFire floor process
US4083604 *Nov 15, 1976Apr 11, 1978Trw Inc.Thermomechanical fracture for recovery system in oil shale deposits
US4113313 *May 16, 1977Sep 12, 1978In Situ Technology, Inc.Recovering uranium from coal in situ
US4120355 *Aug 30, 1977Oct 17, 1978Standard Oil Company (Indiana)Method for providing fluid communication for in situ shale retort
US4171146 *Jan 23, 1978Oct 16, 1979Occidental Research CorporationRecovery of shale oil and magnesia from oil shale
US4178039 *Jan 30, 1978Dec 11, 1979Occidental Oil Shale, Inc.Water treatment and heating in spent shale oil retort
US4886118 *Feb 17, 1988Dec 12, 1989Shell Oil CompanyConductively heating a subterranean oil shale to create permeability and subsequently produce oil
US6997518 *Apr 24, 2002Feb 14, 2006Shell Oil CompanyIn situ thermal processing and solution mining of an oil shale formation
US7040397Apr 24, 2002May 9, 2006Shell Oil CompanyThermal processing of an oil shale formation to increase permeability of the formation
US7077198 *Oct 24, 2002Jul 18, 2006Shell Oil CompanyIn situ recovery from a hydrocarbon containing formation using barriers
US7493952 *Feb 27, 2006Feb 24, 2009Archon Technologies Ltd.Oilfield enhanced in situ combustion process
US7493953 *Mar 13, 2008Feb 24, 2009Archon Technologies Lcd.Oilfield enhanced in situ combustion process
US7549470 *Oct 20, 2006Jun 23, 2009Shell Oil CompanySolution mining and heating by oxidation for treating hydrocarbon containing formations
US7644765Oct 19, 2007Jan 12, 2010Shell Oil CompanyHeating tar sands formations while controlling pressure
US7644993Mar 22, 2007Jan 12, 2010Exxonmobil Upstream Research CompanyIn situ co-development of oil shale with mineral recovery
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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
US8641150Dec 11, 2009Feb 4, 2014Exxonmobil Upstream Research CompanyIn situ co-development of oil shale with mineral recovery
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
US8701788Dec 22, 2011Apr 22, 2014Chevron U.S.A. Inc.Preconditioning a subsurface shale formation by removing extractible organics
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
US8770284Apr 19, 2013Jul 8, 2014Exxonmobil Upstream Research CompanySystems and methods of detecting an intersection between a wellbore and a subterranean structure that includes a marker material
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
US8839860Dec 22, 2011Sep 23, 2014Chevron U.S.A. Inc.In-situ Kerogen conversion and product isolation
US8851170Apr 9, 2010Oct 7, 2014Shell Oil CompanyHeater assisted fluid treatment of a subsurface formation
US8851177Dec 22, 2011Oct 7, 2014Chevron U.S.A. Inc.In-situ kerogen conversion and oxidant regeneration
US8857506May 24, 2013Oct 14, 2014Shell Oil CompanyAlternate energy source usage methods for in situ heat treatment processes
US8863839Nov 15, 2010Oct 21, 2014Exxonmobil Upstream Research CompanyEnhanced convection for in situ pyrolysis of organic-rich rock formations
US8875789Aug 8, 2011Nov 4, 2014Exxonmobil Upstream Research CompanyProcess for producing hydrocarbon fluids combining in situ heating, a power plant and a gas plant
US8881806Oct 9, 2009Nov 11, 2014Shell Oil CompanySystems and methods for treating a subsurface formation with electrical conductors
US8936089Dec 22, 2011Jan 20, 2015Chevron U.S.A. Inc.In-situ kerogen conversion and recovery
US8992771May 25, 2012Mar 31, 2015Chevron U.S.A. Inc.Isolating lubricating oils from subsurface shale formations
US8997869Dec 22, 2011Apr 7, 2015Chevron U.S.A. Inc.In-situ kerogen conversion and product upgrading
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
US9033033Dec 22, 2011May 19, 2015Chevron U.S.A. Inc.Electrokinetic enhanced hydrocarbon recovery from oil shale
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
US9080441Oct 26, 2012Jul 14, 2015Exxonmobil Upstream Research CompanyMultiple electrical connections to optimize heating for in situ pyrolysis
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
US9133398Dec 22, 2011Sep 15, 2015Chevron U.S.A. Inc.In-situ kerogen conversion and recycling
US9181467Dec 22, 2011Nov 10, 2015Uchicago Argonne, LlcPreparation and use of nano-catalysts for in-situ reaction with kerogen
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
US9347302Nov 12, 2013May 24, 2016Exxonmobil Upstream Research CompanyResistive heater for in situ formation heating
US9394772Sep 17, 2014Jul 19, 2016Exxonmobil Upstream Research CompanySystems and methods for in situ resistive heating of organic matter in a subterranean formation
US9399905May 4, 2015Jul 26, 2016Shell Oil CompanyLeak detection in circulated fluid systems for heating subsurface formations
US9512699Jul 30, 2014Dec 6, 2016Exxonmobil Upstream Research CompanySystems and methods for regulating an in situ pyrolysis process
US9528322Jun 16, 2014Dec 27, 2016Shell Oil CompanyDual motor systems and non-rotating sensors for use in developing wellbores in subsurface formations
US20020029885 *Apr 24, 2001Mar 14, 2002De Rouffignac Eric PierreIn situ thermal processing of a coal formation using a movable heating element
US20020033256 *Apr 24, 2001Mar 21, 2002Wellington Scott LeeIn situ thermal processing of a hydrocarbon containing formation with a selected hydrogen to carbon ratio
US20020033257 *Apr 24, 2001Mar 21, 2002Shahin Gordon ThomasIn situ thermal processing of hydrocarbons within a relatively impermeable formation
US20020034380 *Apr 24, 2001Mar 21, 2002Maher Kevin AlbertIn situ thermal processing of a coal formation with a selected moisture content
US20020038709 *Apr 24, 2001Apr 4, 2002Wellington Scott LeeIn situ thermal processing of a hydrocarbon containing formation using a natural distributed combustor
US20020038710 *Apr 24, 2001Apr 4, 2002Maher Kevin AlbertIn situ thermal processing of a hydrocarbon containing formation having a selected total organic carbon content
US20020038711 *Apr 24, 2001Apr 4, 2002Rouffignac Eric Pierre DeIn situ thermal processing of a hydrocarbon containing formation using heat sources positioned within open wellbores
US20020043365 *Apr 24, 2001Apr 18, 2002Berchenko Ilya EmilIn situ thermal processing of a coal formation with a selected ratio of heat sources to production wells
US20020043367 *Apr 24, 2001Apr 18, 2002Rouffignac Eric Pierre DeIn situ thermal processing of a hydrocarbon containing formation to increase a permeability of the formation
US20020046838 *Apr 24, 2001Apr 25, 2002Karanikas John MichaelIn situ thermal processing of a hydrocarbon containing formation with carbon dioxide sequestration
US20020053429 *Apr 24, 2001May 9, 2002Stegemeier George LeoIn situ thermal processing of a hydrocarbon containing formation using pressure and/or temperature control
US20020053431 *Apr 24, 2001May 9, 2002Wellington Scott LeeIn situ thermal processing of a hydrocarbon containing formation to produce a selected ratio of components in a gas
US20020053432 *Apr 24, 2001May 9, 2002Berchenko Ilya EmilIn situ thermal processing of a hydrocarbon containing formation using repeating triangular patterns of heat sources
US20020056551 *Apr 24, 2001May 16, 2002Wellington Scott LeeIn situ thermal processing of a hydrocarbon containing formation in a reducing environment
US20020057905 *Apr 24, 2001May 16, 2002Wellington Scott LeeIn situ thermal processing of a hydrocarbon containing formation to produce oxygen containing formation fluids
US20020062051 *Apr 24, 2001May 23, 2002Wellington Scott L.In situ thermal processing of a hydrocarbon containing formation with a selected moisture content
US20020077515 *Apr 24, 2001Jun 20, 2002Wellington Scott LeeIn situ thermal processing of a hydrocarbon containing formation to produce hydrocarbons having a selected carbon number range
US20020084074 *Sep 24, 2001Jul 4, 2002De Rouffignac Eric PierreIn situ thermal processing of a hydrocarbon containing formation to increase a porosity of the formation
US20020104654 *Apr 24, 2001Aug 8, 2002Shell Oil CompanyIn situ thermal processing of a coal formation to convert a selected total organic carbon content into hydrocarbon products
US20030131994 *Apr 24, 2002Jul 17, 2003Vinegar Harold J.In situ thermal processing and solution mining of an oil shale formation
US20030164234 *Apr 24, 2001Sep 4, 2003De Rouffignac Eric PierreIn situ thermal processing of a hydrocarbon containing formation using a movable heating element
US20030192691 *Oct 24, 2002Oct 16, 2003Vinegar Harold J.In situ recovery from a hydrocarbon containing formation using barriers
US20030196801 *Oct 24, 2002Oct 23, 2003Vinegar Harold J.In situ thermal processing of a hydrocarbon containing formation via backproducing through a heater well
US20030213594 *Jun 12, 2003Nov 20, 2003Shell Oil CompanyIn situ thermal processing of a hydrocarbon containing formation to produce a mixture with a selected hydrogen content
US20040108111 *Apr 24, 2001Jun 10, 2004Vinegar Harold J.In situ thermal processing of a coal formation to increase a permeability/porosity of the formation
US20040140096 *Oct 24, 2003Jul 22, 2004Sandberg Chester LedlieInsulated conductor temperature limited heaters
US20040144541 *Oct 24, 2003Jul 29, 2004Picha Mark GregoryForming wellbores using acoustic methods
US20040145969 *Oct 24, 2003Jul 29, 2004Taixu BaiInhibiting wellbore deformation during in situ thermal processing of a hydrocarbon containing formation
US20040177966 *Oct 24, 2003Sep 16, 2004Vinegar Harold J.Conductor-in-conduit temperature limited heaters
US20060207762 *Feb 27, 2006Sep 21, 2006Conrad AyasseOilfield enhanced in situ combustion process
US20070131415 *Oct 20, 2006Jun 14, 2007Vinegar Harold JSolution mining and heating by oxidation for treating hydrocarbon containing formations
US20070137857 *Apr 21, 2006Jun 21, 2007Vinegar Harold JLow temperature monitoring system for subsurface barriers
US20080017370 *Oct 20, 2006Jan 24, 2008Vinegar Harold JTemperature limited heater with a conduit substantially electrically isolated from the formation
US20080066907 *Jun 7, 2005Mar 20, 2008Archon Technologies Ltd.Oilfield Enhanced in Situ Combustion Process
US20080087427 *Oct 10, 2007Apr 17, 2008Kaminsky Robert DCombined development of oil shale by in situ heating with a deeper hydrocarbon resource
US20080169096 *Mar 13, 2008Jul 17, 2008Conrad AyasseOilfield enhanced in situ combustion process
US20080283241 *Apr 18, 2008Nov 20, 2008Kaminsky Robert DDownhole burner wells for in situ conversion of organic-rich rock formations
US20080289819 *May 21, 2008Nov 27, 2008Kaminsky Robert DUtilization of low BTU gas generated during in situ heating of organic-rich rock
US20080314593 *Jun 1, 2007Dec 25, 2008Shell Oil CompanyIn situ thermal processing of an oil shale formation using a pattern of heat sources
US20090050319 *Apr 18, 2008Feb 26, 2009Kaminsky Robert DDownhole burners for in situ conversion of organic-rich rock formations
US20090145598 *Nov 14, 2008Jun 11, 2009Symington William AOptimization of untreated oil shale geometry to control subsidence
US20090194278 *Feb 6, 2009Aug 6, 2009L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges ClaudeEnhanced Oil Recovery In Oxygen Based In Situ Combustion Using Foaming Agents
US20090308606 *Feb 27, 2007Dec 17, 2009Archon Technologies Ltd.Diluent-Enhanced In-Situ Combustion Hydrocarbon Recovery Process
US20090308608 *Mar 17, 2009Dec 17, 2009Kaminsky Robert DField Managment For Substantially Constant Composition Gas Generation
US20100089585 *Dec 15, 2009Apr 15, 2010Kaminsky Robert DMethod of Developing Subsurface Freeze Zone
US20100181066 *Jan 4, 2010Jul 22, 2010Shell Oil CompanyThermal processes for subsurface formations
US20100218946 *Jan 7, 2010Sep 2, 2010Symington William AWater Treatment Following Shale Oil Production By In Situ Heating
US20100282460 *Apr 21, 2010Nov 11, 2010Stone Matthew TConverting Organic Matter From A Subterranean Formation Into Producible Hydrocarbons By Controlling Production Operations Based On Availability Of One Or More Production Resources
US20100319909 *Feb 25, 2010Dec 23, 2010Symington William AEnhanced Shale Oil Production By In Situ Heating Using Hydraulically Fractured Producing Wells
US20110132600 *Dec 10, 2010Jun 9, 2011Robert D KaminskyOptimized Well Spacing For In Situ Shale Oil Development
US20110146982 *Nov 15, 2010Jun 23, 2011Kaminsky Robert DEnhanced Convection For In Situ Pyrolysis of Organic-Rich Rock Formations
US20110170843 *Sep 29, 2010Jul 14, 2011Shell Oil CompanyGrouped exposed metal heaters
US20160251947 *Feb 23, 2016Sep 1, 2016Schlumberger Technology CorporationMethods of Modifying Formation Properties
CN1993534BJun 7, 2005Oct 12, 2011阿克恩科技有限公司Oilfield enhanced in situ combustion process
CN103233713A *Apr 28, 2013Aug 7, 2013吉林省众诚汽车服务连锁有限公司Method and process for extracting shale oil gas through oil shale in situ horizontal well fracture chemical destructive distillation
CN103233713BApr 28, 2013Feb 26, 2014吉林省众诚汽车服务连锁有限公司Method and process for extracting shale oil gas through oil shale in situ horizontal well fracture chemical destructive distillation
WO2003035801A2 *Oct 24, 2002May 1, 2003Shell Oil CompanyProducing hydrocarbons and non-hydrocarbon containing materials from a hydrocarbon containing formation
WO2003035801A3 *Oct 24, 2002Feb 17, 2005Shell Oil CoProducing hydrocarbons and non-hydrocarbon containing materials from a hydrocarbon containing formation
WO2007126676A2 *Mar 22, 2007Nov 8, 2007Exxonmobil Upstream Research CompanyIn situ co-development of oil shale with mineral recovery
WO2007126676A3 *Mar 22, 2007Feb 21, 2008Exxonmobil Upstream Res CoIn situ co-development of oil shale with mineral recovery
Classifications
U.S. Classification299/5, 166/247, 166/261
International ClassificationE21B43/243, E21B43/28, E21B43/00, E21B43/16
Cooperative ClassificationE21B43/28, E21B43/243
European ClassificationE21B43/28, E21B43/243