| 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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| 07/30/1991 | CA1286980C2 Well perforating apparatus and method |
| 07/25/1991 | DE4001420A1 Alkenylamino-methylene-phosphonic acids and their copolymers prepn. - useful as complexing agents and as scale inhibitors in crude oil recovery |
| 07/24/1991 | EP0437843A1 Alkenylaminomethylene phosphonic acids and their copolymers with unsaturated carboxylic acids |
| 07/24/1991 | EP0437805A1 Apparatus for the expulsion of light volatile pollutants from ground water |
| 07/24/1991 | CN1053279A Hydraulic release oil tool |
| 07/24/1991 | CN1053278A Well casing flotation device and method |
| 07/24/1991 | CN1013287B Method of recovering oil |
| 07/24/1991 | CA2034782A1 Method of borehole hydraulicking of soluble minerals |
| 07/23/1991 | US5033553 Intra-perforating gun swivel |
| 07/23/1991 | US5033551 Well packer and method |
| 07/23/1991 | US5033550 Well production method |
| 07/23/1991 | US5033549 Method for placing a gravel pack in an oil well with an electric wireline |
| 07/23/1991 | US5033547 Enchaned oil recovery |
| 07/23/1991 | US5033546 Production simulation process by pilot test in a hydrocarbon deposit |
| 07/23/1991 | US5033545 Conduit of well cleaning and pumping device and method of use thereof |
| 07/23/1991 | CA1286613C Reducing oil content of produced water by gas flotation |
| 07/20/1991 | CA2034517A1 Alkenylaminomethylenephosphonic acids and copolymers thereof with unsaturated carboxylic acids |
| 07/18/1991 | DE4040838A1 Pulsating inert gas expelling volatile contaminants from terrain - and ground water prevents explosive mixt. formation |
| 07/17/1991 | EP0437070A1 Gas separator for submersible pumps |
| 07/17/1991 | EP0436605A1 Subsea flowline connection |
| 07/17/1991 | CA2034228A1 System for driving volatile contaminants from ground water |
| 07/17/1991 | CA2030330A1 Method of using urea as a sacrificial agent for surfactants in enhanced oil recovery |
| 07/16/1991 | US5032273 Apparatus for separating sand and oil from a waste water stream |
| 07/16/1991 | US5032042 Method and apparatus for eliminating non-naturally occurring subsurface, liquid toxic contaminants from soil |
| 07/16/1991 | US5031963 Method of downhole hydraulicking mineral resources |
| 07/16/1991 | US5031699 Method of casing off a producing formation in a well |
| 07/16/1991 | US5031698 Steam foam surfactants enriched in alpha olefin disulfonates for enhanced oil recovery |
| 07/16/1991 | US5031697 Method for troubleshooting gas-lift wells |
| 07/16/1991 | US5031466 Method and apparatus for determining steam quality and mass flow rate |
| 07/16/1991 | US5031465 Steam quality and mass flow rate measurement using critical flow choke upstream of an orifice plate |
| 07/16/1991 | CA1286217C Completion procedure for pads subjected to thermal steam stimulation |
| 07/16/1991 | CA1286150C Gas and oil well pumping or swabbing device and method |
| 07/16/1991 | CA1286099C Method of fracturing using hydration process involving sequential steps |
| 07/11/1991 | WO1991009815A1 Ceramic microspheres |
| 07/10/1991 | EP0436417A2 A tubing and wireline conveyed perforating method and apparatus |
| 07/10/1991 | CN1013134B Process for the enhanced oil recovery of underground mineral oil deposits |
| 07/10/1991 | CA2027432A1 Recirculating gas separator for electric submersible pumps |
| 07/09/1991 | US5030603 Lightweight oil and gas well proppants |
| 07/09/1991 | US5030036 Method of isolating contaminated geological formations, soils and aquifers |
| 07/09/1991 | US5029641 Inverted wellbore completion |
| 07/09/1991 | CA1285748C Oil recovery with water containing carbonate salt and co |
| 07/09/1991 | CA1285747C Carbonate-containing co _foam for enhanced oil recovery |
| 07/05/1991 | CA2007218A1 Use of chlorous acid in oil recovery |
| 07/03/1991 | EP0435856A2 Multi-mode testing tool |
| 07/03/1991 | EP0435756A1 Method and device for stimulation of an underground formation by injection of a fluid coming from an adjacent zone along fractures proceeding from a drain hole in a low-permeable intermediate layer |
| 07/03/1991 | EP0435727A1 Method and device for stimulation of an underground formation by injection of a fluid coming from an adjacent zone being connected to the first one by a drain hole transversing a low-permeable intermediate layer |
| 07/03/1991 | EP0435716A1 Device for separation of a gas-liquid-mixture as supply for a downhole pump |
| 07/03/1991 | CN2080098U Anti-freezing device for air discharg pipe of wellhead casing |
| 07/02/1991 | US5028343 Inhibit Loss Of Catalytic Activity In Storage For An Amine-Mercaptan Mixture |
| 07/02/1991 | US5028212 Method and apparatus for removal of floating immiscible liquids |
| 07/02/1991 | US5027902 Self-cycling pump apparatus and method |
| 07/02/1991 | US5027899 Method of gravel packing a well |
| 07/02/1991 | US5027898 Foaming agents for carbon dioxide and steam floods |
| 07/02/1991 | US5027897 Supplying solvent and hydrophilizing solution into well |
| 07/02/1991 | US5027896 Combustion |
| 07/02/1991 | US5027708 Safe arm system for a perforating apparatus having a transport mode an electric contact mode and an armed mode |
| 07/02/1991 | CA1285379C Salt-tolerant alkyl aryl sulfonate compositions for use in enhanced oilrecovery processes |
| 06/30/1991 | CA2030745A1 Method to reduce movement of a cpf device via a gelled petroleum based fluid |
| 06/30/1991 | CA2030744A1 Method to reduce movement of a cpf device via a shear-thickening fluid |
| 06/30/1991 | CA2030743A1 Method to reduce movement of a cpf device via a drag-reducing fluid tamp |
| 06/30/1991 | CA2024669A1 Sequential injection foam process for enhanced oil recovery |
| 06/29/1991 | CA2033367A1 Device for separating free gas mixed with a liquid at the inlet of a pump in a bored tube-well |
| 06/28/1991 | WO1991010041A1 Placing gravel pack in an oil well |
| 06/28/1991 | WO1991010040A1 Process for in-situ enrichment of gas used in miscible flooding |
| 06/28/1991 | CA2069735A1 Process for in-situ enrichment of gas used in miscible flooding |
| 06/26/1991 | EP0434461A1 Ceramic microspheres |
| 06/25/1991 | US5026481 Liquid membrane catalytic scale dissolution method |
| 06/25/1991 | US5026168 Slurry mixing apparatus |
| 06/25/1991 | US5025865 Subsea oil production system |
| 06/25/1991 | US5025863 Enhanced liquid hydrocarbon recovery process |
| 06/25/1991 | US5025861 Tubing and wireline conveyed perforating method and apparatus |
| 06/25/1991 | US5025860 Method and apparatus of obtaining natural gas from a maritime deposit |
| 06/25/1991 | US5025859 Overlapping horizontal fracture formation and flooding process |
| 06/25/1991 | CA1285216C Method of recovering viscous oil from reservoirs with multiple horizontalzones |
| 06/25/1991 | CA1285215C Method and apparatus for perforating formations in response to tubing pressure |
| 06/25/1991 | CA1285214C Multi-phase charge holder |
| 06/23/1991 | CA2033131A1 Ceramic microspheres |
| 06/22/1991 | WO1991010042A1 Process for enriching a gas |
| 06/22/1991 | CA2069434A1 Process for enriching a gas |
| 06/21/1991 | CA2032418A1 Method for determining a transit time for a radioactive tracer |
| 06/19/1991 | EP0432873A2 Pressure balanced cartridge choke valve |
| 06/19/1991 | EP0432787A1 Process for removing water soluble organic compounds from produced water |
| 06/19/1991 | CN1052352A Suspending point loading with variable torque balance rod type oil pumping machine |
| 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 | US5024487 Method of creating an underground batch retort complex |
| 06/18/1991 | US5024275 Method of recovering hydrocarbons using single well injection/production system |
| 06/18/1991 | US5024274 Method and apparatus for enhanced oil recovery |
| 06/14/1991 | WO1991009206A1 Method of supporting fractures in geological formations and hydraulic fluid composition for same |
| 06/12/1991 | EP0431689A1 Packer and service tool assembly |
| 06/12/1991 | EP0431384A1 Apparatus for the expulsion of volatile pollutants from ground water |
| 06/12/1991 | EP0431085A1 Method of decontaminating earth. |
| 06/11/1991 | US5022787 Method of returning geothermal gases to the underground |
| 06/11/1991 | US5022467 Polymer containing pendant silyl ether groups useful in enhanced oil recovery using CO2 flooding |
| 06/11/1991 | US5022466 Method for steam flooding profile control |
| 06/11/1991 | US5022427 Annular safety system for gas lift production |
| 06/11/1991 | CA1284768C Firing head for a tubing conveyed perforating gun |
| 06/09/1991 | CA2031813A1 Method of flowing viscous hydrocarbons in a single well injection/production system |
| 06/06/1991 | DE4004241C1 Methanation plant for synthesis gas contg. carbon mon:oxide - includes liq. jet pump driven by feed-water |
| 06/05/1991 | EP0430389A1 Gravel packing assembly |