| Patents for E21B 43 - Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (64,186) |
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| 03/29/1977 | US4014721 Ignition mixture for initiating underground in-situ combustion |
| 03/29/1977 | US4014575 System for fuel and products of oil shale retort |
| 03/29/1977 | US4014527 Chemical blending system |
| 03/29/1977 | US4014387 Apparatus and process for drawing water from a water-bearing strata |
| 03/29/1977 | US4014177 Marine pier having deeply submerged storage container |
| 03/22/1977 | US4013569 Aqueous anionic surfactant systems containing aromatic ether polysulfonates |
| 03/22/1977 | US4013538 Deep submersible power electrode assembly for ground conduction of electricity |
| 03/22/1977 | US4013125 Flooding with micellar dispersions containing petroleum sulfonates obtained by sulfonating whole or topped crude oil |
| 03/15/1977 | US4012328 Acid soluble packer and workover fluid |
| 03/15/1977 | US4012207 Oil recovery |
| 03/15/1977 | US4011906 Downhole valve for paraffin control |
| 03/15/1977 | US4011815 Safe-handling arming apparatus for perforating guns |
| 03/08/1977 | US4010804 Distributed load liner hanger and method of use thereof |
| 03/08/1977 | US4010803 Method for cryothermal fracturing of rock formations |
| 03/08/1977 | US4010802 Well stimulation |
| 03/08/1977 | US4010801 Method of and apparatus for in situ gasification of coal and the capture of resultant generated heat |
| 03/08/1977 | US4010800 Producing thin seams of coal in situ |
| 03/08/1977 | US4010799 Method for reducing power loss associated with electrical heating of a subterranean formation |
| 03/08/1977 | US4010798 Method and apparatus for completing underwater well heads |
| 03/01/1977 | US4009757 Sand consolidation method |
| 03/01/1977 | US4009756 Method and apparatus for flooding of oil-bearing formations by downward inter-zone pumping |
| 03/01/1977 | US4009584 Method of and a device for forming a fluidtight duct transition through a wall |
| 02/22/1977 | US4008765 Method of recovering viscous petroleum from thick tar sand |
| 02/22/1977 | US4008764 Carrier gas vaporized solvent oil recovery method |
| 02/22/1977 | US4008763 Well treatment method |
| 02/22/1977 | US4008762 Extraction of hydrocarbons in situ from underground hydrocarbon deposits |
| 02/22/1977 | US4008761 Method for induction heating of underground hydrocarbon deposits using a quasi-toroidal conductor envelope |
| 02/22/1977 | US4008760 Circulating valve |
| 02/15/1977 | US4007964 Chlorides, dissolving |
| 02/15/1977 | US4007963 Oil collection and recovery system for in situ oil shale retort |
| 02/15/1977 | US4007796 Explosively actuated well tool having improved disarmed configuration |
| 02/15/1977 | US4007791 Method for recovery of crude oil from oil wells |
| 02/15/1977 | US4007788 Reducing viscosity with heated fluid |
| 02/15/1977 | US4007787 Dissolving with light hydrocarbons |
| 02/15/1977 | US4007786 Secondary recovery of oil by steam stimulation plus the production of electrical energy and mechanical power |
| 02/15/1977 | US4007785 Heated multiple solvent method for recovering viscous petroleum |
| 02/15/1977 | US4007783 Well plug with anchor means |
| 02/08/1977 | US4007380 Control of chokes |
| 02/08/1977 | US4006778 Thermal recovery of hydrocarbon from tar sands |
| 02/01/1977 | US4005753 Method of treating a subterranean formation with a polymeric diverting agent |
| 02/01/1977 | US4005752 Method of igniting in situ oil shale retort with fuel rich flue gas |
| 02/01/1977 | US4005750 Method for selectively orienting induced fractures in subterranean earth formations |
| 01/25/1977 | US4004637 Oil recovery by improved surfactant flooding |
| 01/25/1977 | US4004636 Combined multiple solvent and thermal heavy oil recovery |
| 01/25/1977 | US4004635 Method for connecting a submerged well head to a pipe consisting of steel tubes |
| 01/18/1977 | US4003678 Fluid operated well turbopump |
| 01/18/1977 | US4003441 Method of opening carbon-bearing beds with production wells for underground gasification |
| 01/18/1977 | US4003432 Method of recovery of bitumen from tar sand formations |
| 01/11/1977 | US4002119 Method for in situ assembly of charge for controlled shooting of wells |
| 12/28/1976 | US3999803 In situ leaching of explosively fractured ore bodies |
| 12/28/1976 | US3999782 Connector apparatus |
| 12/28/1976 | US3999609 Explosive well stimulation method |
| 12/28/1976 | US3999608 Oil well gravel packing method and apparatus |
| 12/28/1976 | US3999607 Recovery of hydrocarbons from coal |
| 12/28/1976 | US3999606 Oil recovery rate by throttling production wells during combustion drive |
| 12/28/1976 | US3999605 Well tool for setting and supporting liners |
| 12/28/1976 | US3999604 Rotation release two-way well casing hanger |
| 12/21/1976 | US3998744 Oil fracturing spacing agents |
| 12/21/1976 | US3998492 Method for selectively extracting magnesium chloride hexahydrate from magnesium chloride hexahydrate bearing materials in situ by solution mining |
| 12/21/1976 | US3998271 Multiple fracturing of subterranean formations |
| 12/14/1976 | US3997452 Alkali metal aluminate, dimethylformamide, glycerine |
| 12/14/1976 | US3997006 Well tool having an hydraulically releasable coupler component |
| 12/14/1976 | US3997005 Method for control of subsurface coal gasification |
| 12/14/1976 | US3997004 Method for recovering viscous petroleum |
| 12/07/1976 | US3995693 Reservoir treatment by injecting mixture of CO2 and hydrocarbon gas |
| 12/07/1976 | US3995691 Tool for controlling fluid flow at remote locations |
| 12/07/1976 | US3995690 Well point system |
| 11/30/1976 | US3994345 Method of recovering oil using steam |
| 11/30/1976 | US3994343 Combustion |
| 11/30/1976 | US3994341 Recovering viscous petroleum from thick tar sand |
| 11/30/1976 | US3994340 Method of recovering viscous petroleum from tar sand |
| 11/30/1976 | US3994338 Hydrostatic pressure release for bottom hole oil well pumps |
| 11/23/1976 | US3993146 Apparatus for mining coal using vertical bore hole and fluid |
| 11/23/1976 | US3993135 Thermal process for recovering viscous petroleum |
| 11/23/1976 | US3993133 Selective plugging of formations with foam |
| 11/23/1976 | US3993132 Thermal recovery of hydrocarbons from tar sands |
| 11/23/1976 | US3993131 Tracing flow of petroleum in underground reservoirs |
| 11/23/1976 | US3993130 Method and apparatus for controlling the injection profile of a borehole |
| 11/23/1976 | US3993129 Fluid injection valve for wells |
| 11/23/1976 | US3993098 Time cycle actuator |
| 11/23/1976 | US3992889 Flotation means for subsea well riser |
| 11/16/1976 | US3991836 Well bore perforating apparatus |
| 11/16/1976 | US3991828 Thermal recovery method |
| 11/16/1976 | US3991827 Well consolidation method |
| 11/16/1976 | US3991825 Secondary recovery system utilizing free plunger air lift system |
| 11/09/1976 | US3990514 Method of connection of wells |
| 11/09/1976 | US3990513 Method of solution mining of coal |
| 11/09/1976 | US3990512 Method and system for ultrasonic oil recovery |
| 11/09/1976 | US3990509 Tool for servicing wells |
| 11/09/1976 | US3990507 High temperature perforating apparatus |
| 11/09/1976 | US3990298 Method of determining the relation between fractional flow and saturation of oil |
| 11/02/1976 | USRE29021 Underground mining system |
| 11/02/1976 | US3989993 Drive and control mechanism for electrically operated reciprocating apparatus |
| 11/02/1976 | US3989108 Water exclusion method for hydrocarbon production wells using freezing technique |
| 11/02/1976 | US3989107 Induction heating of underground hydrocarbon deposits |
| 11/02/1976 | US3988898 Pipelines and marine platforms |
| 10/26/1976 | US3988036 Electric induction heating of underground ore deposits |
| 10/26/1976 | US3987854 Gravel packing apparatus and method |
| 10/26/1976 | US3987853 Injecting hot fluid to produce gas bubbles |
| 10/26/1976 | US3987852 Method of and apparatus for in situ gasification of coal and the capture of resultant generated heat |