| 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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| 10/13/1981 | US4294492 Caliper seal assembly |
| 09/29/1981 | US4291433 Apparatus for steam cleaning liners in oil well bores and the like |
| 09/22/1981 | US4290388 Vapor generator |
| 09/15/1981 | US4289204 Solar heat treating of well fluids |
| 09/08/1981 | USRE30738 Apparatus and method for in situ heat processing of hydrocarbonaceous formations |
| 09/08/1981 | US4287957 Cooling a drilling tool component with a separate flow stream of reduced-temperature gaseous drilling fluid |
| 08/25/1981 | US4285401 Electric and hydraulic powered thermal stimulation and recovery system and method for subterranean wells |
| 08/18/1981 | US4284139 Process for stimulating and upgrading the oil production from a heavy oil reservoir |
| 07/21/1981 | CA1105377A1 Method of selectively heating kerogen in oil shale |
| 07/07/1981 | US4276936 Method of thermally insulating a wellbore |
| 05/26/1981 | US4269211 Steam manifold distribution system for providing equal quality of steam in two lines |
| 05/12/1981 | US4266609 Method of extracting liquid and gaseous fuel from oil shale and tar sand |
| 05/05/1981 | US4265307 Shale oil recovery |
| 03/31/1981 | US4258791 Thermal insulation method |
| 03/10/1981 | CA1097213A1 Method for in situ combustion for enhanced thermal recovery of hydrocarbons from a well and ignition system therefor |
| 02/11/1981 | EP0023850A1 Cryostat for photon detector and its use in a borehole logging tool |
| 02/10/1981 | US4249607 Miscible displacement oil recovery method |
| 02/10/1981 | US4249605 Secondary recovery method and system using solar energy and concentric tank separator |
| 02/03/1981 | US4248306 By pumping oil into a subterranean boiler unit; distillation, cracking |
| 02/03/1981 | US4248298 Well logging evaporative thermal protection system |
| 01/20/1981 | US4245701 Apparatus and method for igniting an in situ oil shale retort |
| 01/06/1981 | US4243098 Downhole steam apparatus |
| 12/30/1980 | US4241592 Cryostat for borehole sonde employing semiconductor detector |
| 12/09/1980 | US4237973 Method and apparatus for steam generation at the bottom of a well bore |
| 11/18/1980 | US4234042 Direct combustion stimulation of a producing well |
| 10/21/1980 | US4228856 Process for recovering viscous, combustible material |
| 10/07/1980 | CA1087091A1 Combustion air injection well |
| 10/07/1980 | CA1087090A1 Thermostatically controlled valve for automatically regulating the flow of a cooling liquid for gases obtained by underground gasification of solid fuels or by "in situ" combustion of underground hydrocarbons |
| 09/30/1980 | US4224991 Method and apparatus for extracting crude oil from previously tapped deposits |
| 09/30/1980 | CA1086636A1 Method and apparatus using flexible hose in logging highly deviated or very hot earth boreholes |
| 09/23/1980 | US4223735 Scrubbing sulfur oxides from flue gas |
| 08/12/1980 | US4217146 Crude oil, titanium dioxide weighting agent |
| 08/05/1980 | US4215753 Drilling fluid cooling system |
| 08/05/1980 | CA1083133A1 Heat shield for a drill string shock absorbing apparatus |
| 08/05/1980 | CA1083032A1 Steam injection system for use in a well |
| 07/22/1980 | CA1082104A1 Steam distribution system for use in a well |
| 07/15/1980 | US4212354 Method for injecting carbon dioxide into a well |
| 07/08/1980 | US4211291 Drill fluid powered hydraulic system |
| 07/08/1980 | CA1081116A1 Steam deflector for use in a well |
| 06/24/1980 | US4209065 Thermal-operated valve for control of coolant rate of flow in oil wells |
| 06/10/1980 | CA1079140A1 Method and apparatus for producing thermal vapor stream |
| 06/03/1980 | US4205725 Method for forming an automatic burner for in situ combustion for enhanced thermal recovery of hydrocarbons from a well |
| 05/20/1980 | US4203472 Device for stopping fluid flow from a pipe |
| 04/29/1980 | CA1076552A1 Process and installation for drilling holes in the earth's crust under freezing conditions |
| 04/29/1980 | CA1076474A1 Method of producing viscous materials from subterranean formations |
| 04/22/1980 | US4199025 Method and apparatus for tertiary recovery of oil |
| 04/22/1980 | US4199024 Multistage gas generator |
| 04/08/1980 | CA1075148A1 Process for recovering viscous, combustible material |
| 03/18/1980 | US4193448 Apparatus for recovery of petroleum from petroleum impregnated media |
| 03/04/1980 | US4191266 Process and installation for drilling holes in the earth's crust under freezing conditions |
| 02/19/1980 | CA1072005A1 Method for oil recovery using a horizontal well with indirect heating |
| 02/12/1980 | CA1071532A1 Downhole heat exchanger for in-situ minefields |
| 01/29/1980 | US4185691 Secondary oil recovery method and system |
| 01/29/1980 | CA1070611A1 Recovery of hydrocarbons by in situ thermal extraction |
| 01/22/1980 | CA1070238A1 Low heat conductive frangible centralizers |
| 11/20/1979 | US4174752 Secondary recovery method and system for oil wells using solar energy |
| 11/06/1979 | CA1065627A1 Split air convection pile |
| 09/25/1979 | US4168752 Flexible conduit for effecting lateral channelling in coal or oil shale beds |
| 09/25/1979 | US4168747 Method and apparatus using flexible hose in logging highly deviated or very hot earth boreholes |
| 09/25/1979 | CA1232197B Apparatus and method for in situ heat processing of hydrocarbonaceous formations |
| 09/25/1979 | CA1063016A1 Apparatus and method for in situ heat processing of hydro-carbonaceous formations |
| 09/04/1979 | CA1061772A1 Method and means for effecting lateral channelling in coal or oil shale beds |
| 08/21/1979 | CA1060786A1 Arrangement for recovering viscous petroleum from thick tar sand |
| 08/14/1979 | CA1060341A1 System for recovering viscous petroleum from thick tar sand |
| 08/14/1979 | CA1060340A1 Method of recovering viscous petroleum from tar sand |
| 08/14/1979 | CA1060339A1 Recovering viscous petroleum from thick tar sand |
| 07/24/1979 | CA1059021A1 Means for recovering oil from tar sand deposits and the like |
| 07/24/1979 | CA1059020A1 Technique for insulating a wellbore with silicate foam |
| 07/17/1979 | CA1058516A1 Method for in situ heat processing of hydrocarbonaceous formations |
| 07/10/1979 | CA1058070A1 Oil production processes and apparatus |
| 07/03/1979 | US4159743 Process and system for recovering hydrocarbons from underground formations |
| 06/12/1979 | US4157847 Method and apparatus for utilizing accumulated underground water in the mining of subterranean sulphur |
| 05/29/1979 | US4156421 Method and apparatus for producing thermal vapor stream |
| 05/15/1979 | US4154297 Lift gas heat exchanger |
| 05/08/1979 | US4153110 Ignition of fragmented oil shale below a sill pillar in an in situ oil shale retort |
| 04/03/1979 | US4147213 Combustion air injection well |
| 03/27/1979 | US4146095 Method and apparatus for nuclear heating of oil-bearing formations |
| 03/20/1979 | US4145034 Heat shield for a drill string shock absorbing apparatus |
| 03/20/1979 | US4144935 Apparatus and method for in situ heat processing of hydrocarbonaceous formations |
| 02/20/1979 | US4140180 Method for in situ heat processing of hydrocarbonaceous formations |
| 02/20/1979 | US4140179 In situ radio frequency selective heating process |
| 02/13/1979 | US4139024 Thermal insulation structure |
| 02/06/1979 | US4137968 Ignition system for an automatic burner for in situ combustion for enhanced thermal recovery of hydrocarbons from a well |
| 01/30/1979 | US4136737 Method for automatically initiating in situ combustion for enhanced thermal recovery of hydrocarbons from a well |
| 01/09/1979 | US4134024 Method and apparatus for generating electricity from the flow of fluid through a well |
| 12/19/1978 | US4130301 Double-walled well casing structure |
| 11/28/1978 | US4127169 Secondary oil recovery method and system |
| 11/28/1978 | US4127164 Heat exchange apparatus |
| 11/21/1978 | US4126406 Cooling of downhole electric pump motors |
| 11/14/1978 | US4125289 Method for in situ minefields |
| 11/14/1978 | US4125159 Method and apparatus for isolating and treating subsurface stratas |
| 10/17/1978 | US4120357 Method and apparatus for recovering viscous petroleum from thick tar sand |
| 10/17/1978 | CA1040528A1 Well completion in permafrost |
| 10/10/1978 | US4119485 Heat exchangers and evaporators |
| 09/26/1978 | US4116275 Recovery of hydrocarbons by in situ thermal extraction |
| 09/19/1978 | US4114691 Method for controlling sand in thermal recovery of oil from tar sands |
| 09/19/1978 | US4114687 Systems for producing bitumen from tar sands |
| 09/05/1978 | US4111258 Split air convection pile |
| 08/01/1978 | US4103743 Method and means of treating water wells |
| 07/11/1978 | US4099570 Oil production processes and apparatus |