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Publication numberUS2670802 A
Publication typeGrant
Publication dateMar 2, 1954
Filing dateDec 16, 1949
Priority dateDec 16, 1949
Publication numberUS 2670802 A, US 2670802A, US-A-2670802, US2670802 A, US2670802A
InventorsAckley Charles S
Original AssigneeThermactor Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Reviving or increasing the production of clogged or congested oil wells
US 2670802 A
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Description  (OCR text may contain errors)

March 2, 1954 C. s. ACKLEY 2,670,802 REvIvINO OR INCREASING THE PRODUCTION OE OLOGGEO OR OONGEsIED OIL wELLs 2 Sheets-Sheet l Filed Dec. 16. 1949 A INVENTOR. fsa/mss' 5674/126? March 2, 1954 .cg s ACKLEY 2,670,802

- REVIVING OR REASING THE PRODUCTION OF CLOGGED CONGESTED OIL WELLS Filed Deo. 16. 1949 2 Sheets-Sheet 2 I INVENTOR. 5s/Avis .5'. 4617.452

Patented Mar. 2, 1954 UNITED STATES PATENr OFFICE Charles S. Ackley, Brooklyn, N. Y., .assigner to Thermactor Company, ANew York, N. Y., a corporation of Delaware Applicationnecember 16, 1949, seriaLNwisaasi The invention .herein disclosed relates to the reactivation of oil wells which have lost .production or become dormant rthrough vthe clogging action within the koil sand of congealing wax, gum or sludge present in the oil.

The refrigerationeffected by expansion of the volatile constituents of a ilowing well always yhas an adverse effect tending to make a well seal itself on, and it -is common knowledge that the oil left in a .well at theend of `what may vbeconsidered economical production, is usually much more than that taken out.

The present invention vhas been developed particularly with a view to .restoring such nonproductive though actually valuable, dormant Wells to economical and .proiitable production.

Particularly itis a purpose of the invention to accomplish such results witha vminimum of .new equipment and expense and with full .utilization of .the well equipment .that may be in place in the sand and in so doing., to .create and maintain a hot oil pool spreading from .the well into the surrounding structure and .serving thereby as a restoring agent and as an increasing and sustaining reservoir of production oil.

'Further special objects in this connection are to provide satisfactory controls `for .maintaining the hot oil pool so created more or less .constant inthe extent to which it can be supported by the adjacent or surrounding structure.

Other desirable objects attained by the `invention are set forth and will appear in the course of the following specication denning and broadly covering the invention.

The drawings accompanying and forming part of the specification illustrate certain Apresent practical embodiments of the invention. .Structure and arrangement, however, may be modified and changed as regards such illustration, all within the true intent and broad scope of the invention as hereinafter dened and claimed.

Fig. l in the drawings is a broken sectional view illustrating diagrammatically installation. and operation of the invention for increasing pro duction in a producing well having a declining rate of production;

Fig. 2 is a similar view showing features of the invention as installed in one of the pressurizing Wells of a secondary recovery system;

Fig. 3 is a broken part sectional and perspective view illustrating diagrammatically a typical :five spot layout embodying the invention.

1 claim. I(cl. 16e-23) l .In thecase of a well which is actually producing., but rat a declining rate, the invention may be applied substantially as shown in Fig. l. y

In this view a cased oil well is indicated, having a ,perforated liner .5 in the oil sand at the Y lower end of the casing `l.

vA well head l ,is shown applied tothe casing,l

designed to pass the flow ytubingr and power cable for the electric heater carried by the tubing. heater, asmore fully disclosed in cepending patent application Serial No. 126,089, led November .8, 1949, nowPatent No. 2,632,836, is .of

novel construction, particularly .in that it is of 1 y clamps .i3 loosely seated on the couplings i0. Q

A thermostat set to maintain a desired mean temperature is indicated at le, mounted `on the upper end of the heater.

`A pump is shown at i5 connected in the .flow tubing above the heater1 adapted to vbe operated in the usual way .by sucker rods i6.

The well head may have `a vstuilingbozior.

erably at a Ylevel above the meltingpoint of .the

waxy and gummy constituents'o the oil and below thegasiication temperature of the lighter components of the oil, the heater may .be left.A

on as long as need be to dissolve the congealed materials and cause the thinned, heated oil to penetrate and impartite heat to the surrounding structureto create more or less ,of a spreading pool of hot oil. As lthis Vheated body `expands and Works back into the structure, more .and more of the blocked or congealed ,oilis .released to now back into the. Well and rise in the ,casing andow tubing.

There is, however, a limit to which the heated oil will work outwardly from the well by natural pressure, because due to friction in the sand a balance point is reached that will arrest further outward movement and spread of the hot oil pool.

The time required for building up a sufficient pool of the hot oil will vary with diiferent structures and the extent to which a producing Well may have been depleted.

At any rate, pumping may be started and maintained continuously or intermittently and at a rate proportionate to the build-up of the pool.

Preferably heating and pumping operations are so coordinated as to surely maintain the heater covered at all times with oil.

Also, it is important to remove the oil at a rate su'icient to prevent the hot oil from rising much above the oil sand to avoid heat transfer through the casing to the cooler, surrounding ground barren of oil.

To maintain the oil level at or as near the top of the oil sand as possible, the speedof operation of the pump may be governed, or in some instances the pump may be operated for several 'hours and then shut down, in effect maintaining successive cycles of pumping and heating. Or heating may be continued and pumping effected intermittently, or pumping continued and heating applied in successive intervals, the invention enabling choice of these conditions to meet different situations.

Generally the overburden affords complete insulation, enabling eiective application of heat to maintain the maximum reservoir of hot oil which the structure will support.

This hot oil is the more readily removed by the pump, so the pump is to that extent rendered the more effective. The flow tubing is completely open straight down through the heater and this also is a factor in increasing the recovery rate.

In dormant wells, which have ceased to produce and been abandoned, the same hot pooling method may be followed and the expenses involved may generally be justied, considering that such kwells may retain usually from 40% to 70% of the primary oil in the reservoir. These wells, in most or many cases, have become dormant because of blocked pores filled with wax, sludge or congealed oil which have gradually sealed the porous sand structure and stopped movement of oil through the well.

At the time of abandonment the casing may have been removed and the wells left to cave or fill in with earth and water. To revive such wells involves cleaning out and re-casing to the oil sand, but this ordinarily may be less costly than drilling new wells. In many cases these abandoned wells are left with the casing in place. Unless wells have been abandoned because of the intrusion of salt water into the oil sand, they may profitably be reconditioned under the present invention, utilizing the structure and plan outlined in Figs. 2 and 3.

This may be a pressurizing operation such as practiced in secondary recovery fields, with a number of pressurizing wells grouped about a more or less centrally located outlet well.

A typical arrangement of this character is indicated in Fig. 3, with four pressure injecting Wells I9 grouped in the pattern of a square or rectangle about a substantially centrally located outlet well 20.

Flow tubing 9 carrying the open tubular heaters as previously described, are installed in the pres- 4 sure wells and the outlet well which is cased and has a perforated liner at the bottom, may be left open and be connected and arranged for delivery of oil to storage or tankage.

To revive and restore flow of oil from such a well may require an appreciable length of time, as the sand structure in such a location must'be thoroughly warmed to in eiect thaw out and liquify the waxes or congealed oil by which the sand is sealed. rThe wells containing the heaters may be primed with oil from the surface from time to time, as required to keep the heaters covered. This oil may be introduced through the flow tubing.

In this installation, with no pump or pumping gear, the flow tubing to which the heater is attached has a continuous, unobstructed passage through it from top to bottom. This enables the tubing to be used for gaging the depth of oil accumulating within it.

Before pressurizing, the wells are sealed off at approximately the upper sand level by packers 2l closing the annular well space between the casing and ow tubing. These packers, as indicated in Fig. 2, may have suitable stufng boxes 22 or the like for sealing the power cables therethrough.

After gaging the depth of oil in the open flow tubing and determining that a sufficient pool of hot oil has been built up around and above the heater, the well head 1 may be attached, ready for pressurizing.

The Well head in this case may carry a pressure line 23 and a relief line 24 connected with the flow tubing and equipped with check valve 26, pressure gage 25, pressure relief valve 21 and possibly other accessories, as required.

Natural gas, if available, or compressed air may be used as the pressure fluid. This pressurizing fiuid introduced through the iiow tubing under pressure high enough to prevent the entry of well oil into the iiow tubing at 8 will, upon Contact with the hot inner tube of the heater, expand and comingle with the heated oil within the well and surrounding oil structure. The expansive force of the hot gas drives the heated oil further and further into the congested structure.

The pool of oil surrounding the heater may be replenished from time to time, to take the place of the oil forced back into the structure, by introducing oil, as required, with the pressurizing gas.

Control of pressure and temperature may be effected under guidance of the recording of surface instruments to attain the best results.

The pressurized oil reaching the outlet Well may be delivered under its own pressure or be pumped to a surface pipe line or to tankage.

In this case also the heating of the oil facilitates delivery operations and prevents deposit of paraiiin or other effects that might impede or slow up the action.

The invention thus differs materially from cold water and other pressurizing operations Which may tend to chill and congeal the petroliferous products instead of thinning and rendering them the more fluid.

The output of the production well may be controlled or kept at such a rate `as will maintain the level of heated oil in the pressurized well above the heater therein and maintain the hot oil pool surrounding the pressurized well.

The new equipment required for practicing the invention is relatively simple and can be used in conjunction with the existing Well equipment. Operations are readily controlled in diierent ways to meet special conditions in different locations. The straight through, open construction of the heaters and their mounting on the ow tubing provide for free flow of uid in eithery i products and comprising providing I'low tubing and tubular heater having a continuous, open flow passage therethrough of the same extent and introducing said flow tubing and tubular heater into one well to a depth with the heater in the oil sand locale, packing 01T that well about the flow tubing substantially at the upper level of the oil sand, energizing the heater to liquify and reduce the viscosity of petroliferous products in said Well and immediately surrounding structure to form a hot oil pool and forcing a pressure uid down through said flow tubing and out through the corresponding fully open ow passage of said tubular heater into the hot pool of oil created by said heater in the packed-off portion of the well and the surrounding structure to thereby enforce migration of the lowered viscosity pool contents to the well adjoining and open to the same oil sand, controlling the heater in temperature and time to maintain temperature of the heated oil in the pressurized well above the melting point of waxes and gums and below the gasifying temperature of volatile constituents of the oil, and controlling output of said adjoining Well at a rate to maintain the level of heated oil in the pressurized well above the heater and to maintain the hot oil pool surrounding the pressurized well.

CHARLES S. ACKLEY.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,354,757 Popcke Oct. 5, 1920 1,433,871 Burks et yal Oct. 31, 1922 1,648,242 Powell Nov. 8, 1927 1,726,041 Powell Aug. 27, 1929 2,134,610 Hogg Oct. 25, 1938 2,444,756 Steffen July 6, 1948 2,472,445 Sprong June 7, 1949 OTHER REFERENCES Reistle, C. E., Jr.: Parain and Congealing- Oil Problems, U. S. Bureau of Mines, Bulletin 348, page 97, U. S. Govt. Printing Oflice, Wash- Y ington, 1932.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1354757 *Feb 3, 1917Oct 5, 1920Frank C ReedApparatus for treating oil-wells
US1433871 *Jan 27, 1919Oct 31, 1922Said BurksApparatus for pumping oil wells
US1648242 *Feb 25, 1926Nov 8, 1927Samuel K FrankOil-well stimulator
US1726041 *Sep 7, 1927Aug 27, 1929 Oil-pield-bejttvenating means
US2134610 *Apr 26, 1937Oct 25, 1938Hogg Coy COil-bearing sand heater
US2444756 *Jan 4, 1946Jul 6, 1948Nat Secondary Recovery CorpApparatus for progressively heating oil sands surrounding oil wells
US2472445 *Feb 2, 1945Jun 7, 1949Thermactor CompanyApparatus for treating oil and gas bearing strata
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US2742967 *Nov 13, 1951Apr 24, 1956Union Oil CoOil well process
US2771954 *Apr 29, 1953Nov 27, 1956Exxon Research Engineering CoTreatment of petroleum production wells
US2839143 *Jan 16, 1956Jun 17, 1958Alexander Ford IDisconnecting of well pipe or tubing joints
US3080918 *Aug 29, 1957Mar 12, 1963Richfield Oil CorpPetroleum recovery from subsurface oil bearing formation
US3164207 *Jan 17, 1961Jan 5, 1965Spry William JMethod for recovering oil
US3207220 *Jun 26, 1961Sep 21, 1965Williams Chester IElectric well heater
US3220479 *May 10, 1963Nov 30, 1965Exxon Production Research CoFormation stabilization system
US3246695 *Aug 21, 1961Apr 19, 1966Charles L RobinsonMethod for heating minerals in situ with radioactive materials
US3339635 *Oct 22, 1965Sep 5, 1967Brandon Clarence WMethod and apparatus for forming and/or augmenting an energy wave
US3351132 *Jul 16, 1965Nov 7, 1967Equity Oil CompanyPost-primary thermal method of recovering oil from oil wells and the like
US3500910 *Jan 26, 1967Mar 17, 1970San Miguel Project IncSolvent recovery of petroleum
US4078608 *Mar 23, 1977Mar 14, 1978Texaco Inc.Thermal oil recovery method
US4265485 *Jan 14, 1979May 5, 1981Boxerman Arkady AThermal-mine oil production method
US4378846 *Dec 15, 1980Apr 5, 1983Brock Kurtis BHeated working fluid lowers viscosity of hydrocarbons
US4478278 *Nov 27, 1981Oct 23, 1984Texaco Canada Resources Ltd.Spacer for deep wells
US4886118 *Feb 17, 1988Dec 12, 1989Shell Oil CompanyPyrolysis; enhanced oil recovery
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US7165615Oct 24, 2002Jan 23, 2007Shell Oil CompanyIn situ recovery from a hydrocarbon containing formation using conductor-in-conduit heat sources with an electrically conductive material in the overburden
US7219734Oct 24, 2003May 22, 2007Shell Oil CompanyInhibiting wellbore deformation during in situ thermal processing of a hydrocarbon containing formation
US7225866Jan 31, 2006Jun 5, 2007Shell Oil CompanyIn situ thermal processing of an oil shale formation using a pattern of heat sources
US7320364Apr 22, 2005Jan 22, 2008Shell Oil CompanyInhibiting reflux in a heated well of an in situ conversion system
US7353872Apr 22, 2005Apr 8, 2008Shell Oil CompanyStart-up of temperature limited heaters using direct current (DC)
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
US7540324Oct 19, 2007Jun 2, 2009Shell Oil CompanyHeating hydrocarbon containing formations in a checkerboard pattern staged process
US7546873Apr 21, 2006Jun 16, 2009Shell Oil CompanyLow temperature barriers for use with in situ processes
US7549470Oct 20, 2006Jun 23, 2009Shell Oil CompanySolution mining and heating by oxidation for treating hydrocarbon containing formations
US7556095Oct 20, 2006Jul 7, 2009Shell Oil CompanySolution mining dawsonite from hydrocarbon containing formations with a chelating agent
US7556096Oct 20, 2006Jul 7, 2009Shell Oil CompanyVarying heating in dawsonite zones in hydrocarbon containing formations
US7559367Oct 20, 2006Jul 14, 2009Shell Oil CompanyTemperature limited heater with a conduit substantially electrically isolated from the formation
US7559368Oct 20, 2006Jul 14, 2009Shell Oil CompanySolution mining systems and methods for treating hydrocarbon containing formations
US7562706Oct 20, 2006Jul 21, 2009Shell Oil CompanySystems and methods for producing hydrocarbons from tar sands formations
US7562707Oct 19, 2007Jul 21, 2009Shell Oil CompanyHeating hydrocarbon containing formations in a line drive staged process
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
US7581589Oct 20, 2006Sep 1, 2009Shell Oil CompanyMethods of producing alkylated hydrocarbons from an in situ heat treatment process liquid
US7584789Oct 20, 2006Sep 8, 2009Shell Oil CompanyMethods of cracking a crude product to produce additional crude products
US7591310Oct 20, 2006Sep 22, 2009Shell Oil CompanyMethods of hydrotreating a liquid stream to remove clogging compounds
US7597147Apr 20, 2007Oct 6, 2009Shell Oil CompanyTemperature limited heaters using phase transformation of ferromagnetic material
US7604052Apr 20, 2007Oct 20, 2009Shell Oil CompanyCompositions produced using an in situ heat treatment process
US7610962Apr 20, 2007Nov 3, 2009Shell Oil CompanyProviding acidic gas to a subterrean formation, such as oil shale, by heating from an electrical heater and injecting through an oil wellbore; one of the acidic acids includes hydrogen sulfide and is introduced at a pressure below the lithostatic pressure of the formation to produce fluids; efficiency
US7617869 *Feb 5, 2007Nov 17, 2009Superior Graphite Co.Methods for extracting oil from tar sand
US7631689Apr 20, 2007Dec 15, 2009Shell Oil CompanySulfur barrier for use with in situ processes for treating formations
US7631690Oct 19, 2007Dec 15, 2009Shell Oil CompanyHeating hydrocarbon containing formations in a spiral startup staged sequence
US7635023Apr 20, 2007Dec 22, 2009Shell Oil CompanyTime sequenced heating of multiple layers in a hydrocarbon containing formation
US7635024Oct 19, 2007Dec 22, 2009Shell Oil CompanyHeating tar sands formations to visbreaking temperatures
US7635025Oct 20, 2006Dec 22, 2009Shell Oil CompanyCogeneration systems and processes for treating hydrocarbon containing formations
US7640980Apr 7, 2008Jan 5, 2010Shell Oil CompanyThermal processes for subsurface formations
US7640987Aug 17, 2005Jan 5, 2010Halliburton Energy Services, Inc.Communicating fluids with a heated-fluid generation system
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
US7681647Oct 19, 2007Mar 23, 2010Shell Oil CompanyMethod of producing drive fluid in situ in tar sands formations
US7683296Apr 20, 2007Mar 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
US7770643Oct 10, 2006Aug 10, 2010Halliburton Energy Services, Inc.Hydrocarbon recovery using fluids
US7785427Apr 20, 2007Aug 31, 2010Shell Oil CompanyChromium, nickel, copper; niobium, iron manganese, nitrogen; nanonitrides; system for heating a subterranean formation;
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
US7798221May 31, 2007Sep 21, 2010Shell Oil CompanyIn situ recovery from a hydrocarbon containing formation
US7809538Jan 13, 2006Oct 5, 2010Halliburton Energy Services, Inc.Real time monitoring and control of thermal recovery operations for heavy oil reservoirs
US7831133Apr 21, 2006Nov 9, 2010Shell Oil CompanyInsulated conductor temperature limited heater for subsurface heating coupled in a three-phase WYE configuration
US7831134Apr 21, 2006Nov 9, 2010Shell Oil CompanyGrouped exposed metal heaters
US7832482Oct 10, 2006Nov 16, 2010Halliburton Energy Services, Inc.Producing resources using steam injection
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
US7841425Apr 18, 2008Nov 30, 2010Shell Oil CompanyDrilling subsurface wellbores with cutting structures
US7845411Oct 19, 2007Dec 7, 2010Shell Oil CompanyIn situ heat treatment process utilizing a closed loop heating system
US7849922Apr 18, 2008Dec 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 Companyproduction of hydrocarbons, hydrogen, and/or other products from various subsurface formations such as hydrocarbon containing formations through use of oxidizing fluids and heat
US7866388Oct 13, 2008Jan 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
US7942203Jan 4, 2010May 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
US8011451Oct 13, 2008Sep 6, 2011Shell Oil CompanyRanging methods for developing wellbores in subsurface formations
US8027571Apr 21, 2006Sep 27, 2011Shell Oil CompanyIn situ conversion process systems utilizing wellbores in at least two regions of a formation
US8042610Apr 18, 2008Oct 25, 2011Shell Oil CompanyParallel heater system for subsurface formations
US8070840Apr 21, 2006Dec 6, 2011Shell Oil CompanyTreatment of gas from an in situ conversion process
US8083813Apr 20, 2007Dec 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
US8162059Oct 13, 2008Apr 24, 2012Shell Oil CompanyInduction heaters used to heat subsurface formations
US8162405Apr 10, 2009Apr 24, 2012Shell Oil CompanyUsing tunnels for treating subsurface hydrocarbon containing formations
US8172335Apr 10, 2009May 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
US8196658Oct 13, 2008Jun 12, 2012Shell Oil CompanyIrregular spacing of heat sources for treating hydrocarbon containing formations
US8220539Oct 9, 2009Jul 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
US8224165Apr 21, 2006Jul 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
US8233782Sep 29, 2010Jul 31, 2012Shell Oil CompanyGrouped exposed metal heaters
US8238730Oct 24, 2003Aug 7, 2012Shell Oil CompanyHigh voltage temperature limited heaters
US8240774Oct 13, 2008Aug 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
US8261832Oct 9, 2009Sep 11, 2012Shell Oil CompanyHeating subsurface formations with fluids
US8267170Oct 9, 2009Sep 18, 2012Shell Oil CompanyOffset barrier wells in subsurface formations
US8267185Oct 9, 2009Sep 18, 2012Shell Oil CompanyCirculated heated transfer fluid systems used to treat a subsurface formation
US8272455Oct 13, 2008Sep 25, 2012Shell Oil CompanyMethods for forming wellbores in heated formations
US8276661Oct 13, 2008Oct 2, 2012Shell Oil CompanyHeating subsurface formations by oxidizing fuel on a fuel carrier
US8281861Oct 9, 2009Oct 9, 2012Shell Oil CompanyCirculated heated transfer fluid heating of subsurface hydrocarbon formations
US8327681Apr 18, 2008Dec 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
US8355623Apr 22, 2005Jan 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
US8448707Apr 9, 2010May 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
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
US20110203792 *Dec 15, 2010Aug 25, 2011Chevron U.S.A. Inc.System, method and assembly for wellbore maintenance operations
DE3214067A1 *Apr 16, 1982Nov 11, 1982Inst Francais Du PetroleArrangement for increasing the temperature of a geological formation penetrated by a bore hole
Classifications
U.S. Classification166/401, 166/272.1, 166/60
International ClassificationE21B43/24, E21B43/16
Cooperative ClassificationE21B43/2401
European ClassificationE21B43/24B