| Patents for E21B 36 - Heating, cooling, or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones (4,262) |
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| 08/20/1991 | US5040558 Low thermal stress steam distribution manifold |
| 08/14/1991 | EP0441464A2 In situ soil decontamination method and apparatus |
| 08/13/1991 | CA2036077A1 Assembly for introducing steam into an oil-bearing stratum |
| 08/12/1991 | CA2009782A1 In-situ tuned microwave oil extraction process |
| 07/31/1991 | CN1053469A Oil-well electrothermic band |
| 06/25/1991 | US5026209 Containment casing for a deep well gravity pressure reactor vessel |
| 06/25/1991 | US5025862 Steam injection piping |
| 06/18/1991 | USRE33614 Apparatus and method for enhanced oil recovery |
| 06/18/1991 | US5024556 System for enhanced destruction of hazardous wastes by in situ vitrification of soil |
| 06/18/1991 | US5024274 Method and apparatus for enhanced oil recovery |
| 06/04/1991 | US5020596 In situ method |
| 05/21/1991 | US5016716 Tubing carried perforating gun with insulation jacket |
| 05/07/1991 | US5012868 Corrosion inhibition method and apparatus for downhole electrical heating in mineral fluid wells |
| 04/30/1991 | US5011329 In situ soil decontamination method and apparatus |
| 04/30/1991 | US5010910 Steam distribution manifold |
| 04/23/1991 | US5009264 Well production apparatus including pump means and thermal absorption means |
| 03/27/1991 | CN1012191B Method and apparatus for extracting petroleum |
| 03/20/1991 | EP0417879A1 Insulating support for tubing string |
| 03/19/1991 | US5000263 Method for improving the steam splits in a multiple steam injection process using multiple steam headers |
| 03/12/1991 | CA1281380C Viscosity reduction apparatus |
| 02/26/1991 | US4995462 Dewaxing control apparatus for oil well |
| 02/21/1991 | WO1991002139A1 Casing for gravity pressure reactor vessels |
| 01/29/1991 | US4988389 Jet pump; injection of solvent |
| 01/28/1991 | CA2020996A1 Method for improving the steam splits in a multiple steam injection process |
| 12/28/1990 | CA2010533A1 Insulating support for tubing string |
| 12/19/1990 | CN1010864B Method and apparatus for installation of electric heater in well |
| 11/27/1990 | US4973811 In situ decontamination of spills and landfills by radio frequency induction heating |
| 11/06/1990 | US4967840 Enhanced oil recovery |
| 09/19/1990 | EP0387852A1 Corrosion inhibition apparatus for downhole electrical heating |
| 09/19/1990 | EP0387851A1 Corrosion inhibition method and apparatus for downhole electrical heating in mineral fluid wells |
| 09/19/1990 | EP0387846A1 Power sources for downhole electrical heating |
| 09/19/1990 | CN1009670B Method and device for heating underground region of long distance up to high temp. |
| 09/18/1990 | US4957393 In situ heating to detoxify organic-contaminated soils |
| 09/18/1990 | CA1274172A1 Method and apparatus for forming an insulated oil well casing |
| 09/18/1990 | CA1274171A1 Apparatus for enhanced oil recovery |
| 09/12/1990 | EP0386176A1 Installation for energy exchange between the ground and an energy exchanger. |
| 09/11/1990 | US4956535 Electrode systems for in situ vitrification |
| 09/04/1990 | US4953635 Method for improving the steam splits in a multiple steam injection process |
| 09/04/1990 | CA1273565A1 Heating system for rathole oil well |
| 08/28/1990 | US4951748 Technique for electrically heating formations |
| 08/14/1990 | CA1272680A1 Downhole steam generator |
| 07/24/1990 | CA1271980A1 Method and system for introducing electric current into a well |
| 07/04/1990 | CN1043539A Under well hot extractor for well oil pump |
| 07/03/1990 | CA1271130A1 Method of and apparatus for increasing the mobility of crude oil in an oil deposit |
| 06/05/1990 | US4930454 Steam generating system |
| 05/30/1990 | CN1042584A Method and system for preventing sulphur deposition in high-h2s production wells |
| 05/29/1990 | US4928765 Method and apparatus for shale gas recovery |
| 05/29/1990 | CA1269614A1 Steam generating system |
| 05/22/1990 | US4926949 Thermal shield for drilling motors |
| 05/22/1990 | US4926941 Method of producing tar sand deposits containing conductive layers |
| 05/08/1990 | US4923006 Insulating support for tubing string |
| 05/03/1990 | DE3826169A1 Hydro-jet freeze-boring method and apparatus |
| 04/24/1990 | US4919201 Corrosion inhibition apparatus for downhole electrical heating |
| 04/24/1990 | CA1268195A1 Insert for insulated steam injection tubing |
| 03/27/1990 | US4911240 Self treating paraffin removing apparatus and method |
| 03/27/1990 | US4911239 Method and apparatus for removal of oil well paraffin |
| 02/21/1990 | CN1006918B Technology for installing bunched cables having strands with different diameter into a well |
| 01/30/1990 | US4896725 In-well heat exchange method for improved recovery of subterranean fluids with poor flowability |
| 01/25/1990 | WO1990000707A1 Installation for energy exchange between the ground and an energy exchanger |
| 01/25/1990 | WO1989009664A3 In situ heating to detoxify organic-contaminated soils |
| 01/24/1990 | CN1006596B Metal armoured resistance heater |
| 01/24/1990 | CN1006595B Slender resistance-heater with variable rate of heating |
| 12/28/1989 | WO1989012728A1 In-well heat exchange method for improved recovery of subterranean fluids with poor flowability |
| 12/27/1989 | CN1038328A Nitrogen-gas heat-insulating technique for steam-injection oil production well tubing |
| 12/12/1989 | US4886118 Pyrolysis; enhanced oil recovery |
| 12/05/1989 | US4885591 Method and apparatus for monitoring ice masses |
| 11/16/1989 | WO1989011056A1 Tubing collar |
| 11/15/1989 | EP0341976A2 Thermal insulating fluid |
| 11/07/1989 | US4878540 Apparatus and process for pumping fluid from subterranean formations |
| 10/31/1989 | US4877542 Heavy oil, light oil, smectite clay, calcium oxide, sodium silicate |
| 10/19/1989 | WO1989009664A2 In situ heating to detoxify organic-contaminated soils |
| 10/10/1989 | US4872507 Well bore apparatus arranged for operating in high-temperature wells as well as in low-temperature wells |
| 09/26/1989 | CA1261647A1 Mini-well temperature profiling process |
| 09/20/1989 | CN2044641U Underground hot collector for oil-well pump |
| 09/12/1989 | US4865130 Hot gas generator with integral recovery tube |
| 08/29/1989 | US4861263 Method and apparatus for the recovery of hydrocarbons |
| 08/29/1989 | US4861074 Tubing collar |
| 07/19/1989 | EP0324003A1 Method and apparatus for cleaning wells |
| 05/31/1989 | EP0317719A1 Heating systems for boreholes |
| 05/30/1989 | US4834174 Completion system for downhole steam generator |
| 05/30/1989 | CA1254934A1 Method and apparatus for enhancing liquid hydrocarbon production by formation heating |
| 05/23/1989 | CA1254505A1 Exploitation method for reservoirs containing hydrogen sulphide |
| 05/16/1989 | US4830111 Water well treating method |
| 05/02/1989 | CA1253555A1 Heating rate variant elongated electrical resistance heater |
| 04/18/1989 | US4821798 Heating system for rathole oil well |
| 04/11/1989 | US4819723 Injection of alkali metal silicate in hydrocarbon; breaking emulsion adjacent well bore with microwave energy |
| 03/07/1989 | US4809780 Method for sealing thief zones with heat-sensitive fluids |
| 02/28/1989 | US4807701 Method for thermal stimulation of a subterranean reservoir and apparatus therefor |
| 02/21/1989 | US4805698 For providing electrical power |
| 02/21/1989 | CA1250340A1 Method and apparatus for uniformly heating long subterranean intervals at high temperature |
| 02/21/1989 | CA1250339A1 Heater cable installation |
| 02/21/1989 | CA1250225A1 Burner for igniting an injection well |
| 01/17/1989 | US4798769 Electrode supporting conduit tube for electrical heating of underground hydrocarbon resources |
| 01/10/1989 | CA1248442A1 In-situ steam drive oil recovery process |
| 01/03/1989 | CA1248015A1 Blowout preventer for use in combination with a deep well pump |
| 12/29/1988 | WO1988010356A1 Method and apparatus for cleaning wells |
| 12/27/1988 | US4794049 Electrode supporting conduit tube for electrical heating or underground hydrocarbon resources |
| 12/27/1988 | US4793409 Method and apparatus for forming an insulated oil well casing |
| 12/21/1988 | EP0295712A2 Method and apparatus for forming an insulated oil well casing |
| 12/20/1988 | CA1247000A1 Method and apparatus for producing viscous hydrocarbons utilizing a hot stimulating medium |