| 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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| 09/22/1981 | US4290714 Marine oil leak containment and recovery apparatus |
| 09/22/1981 | US4290650 Subterranean cavity chimney development for connecting solution mined cavities |
| 09/22/1981 | US4290649 Method for explosively expanding a pillar for forming an in situ oil shale retort |
| 09/22/1981 | US4290486 Methods and apparatus for severing conduits |
| 09/22/1981 | US4290485 Reduction of water production from hydrocarbon containing subsurface formations |
| 09/22/1981 | US4290484 Seal receptacle assembly |
| 09/22/1981 | CA1109244A2 Treating subterranean well formations |
| 09/15/1981 | US4289354 Borehole mining of solid mineral resources |
| 09/15/1981 | US4289202 Well tubing coupling apparatus |
| 09/15/1981 | US4289072 Earth fracturing apparatus |
| 09/15/1981 | CA1109005A1 Channel base well screen |
| 09/15/1981 | CA1108982A1 Separator for use in boreholes of limited diameter |
| 09/08/1981 | USRE30738 Apparatus and method for in situ heat processing of hydrocarbonaceous formations |
| 09/08/1981 | US4287952 Method of selective diversion in deviated wellbores using ball sealers |
| 09/08/1981 | US4287951 Process for improving conformance and flow profiles in a subterranean sandstone formation |
| 09/08/1981 | US4287950 Gas pre-injection for chemically enhanced oil recovery |
| 09/08/1981 | US4287949 Setting tools and liner hanger assembly |
| 09/08/1981 | US4287903 Method and apparatus for recovering products of low pumpability |
| 09/08/1981 | CA1108527A1 Well screen mounting arrangement |
| 09/08/1981 | CA1108525A1 In-situ leaching of uranium |
| 09/03/1981 | WO1981002442A1 Riser angle positioning system and process |
| 09/01/1981 | US4286665 Apparatus and method for conducting offshore well operations |
| 09/01/1981 | US4286660 Process and installation for the flooding of petroleum deposits and oil shale |
| 09/01/1981 | US4286659 Ball valve safety screen |
| 09/01/1981 | US4286629 Removable plug |
| 08/25/1981 | US4285638 Jet pump nozzle assembly |
| 08/25/1981 | US4285548 Underground in situ leaching of ore |
| 08/25/1981 | US4285547 Integrated in situ shale oil and mineral recovery process |
| 08/25/1981 | US4285533 Apparatus for carrying first and second weight loads of a tubing string |
| 08/25/1981 | US4285401 Electric and hydraulic powered thermal stimulation and recovery system and method for subterranean wells |
| 08/25/1981 | US4285398 Device for temporarily closing duct-formers in well completion apparatus |
| 08/25/1981 | CA1107712A1 Method and apparatus for leveling templates for offshore subterranean wells |
| 08/25/1981 | CA1107661A1 Collection and separation of uncontrolled blow out material from bore holes in the ocean floor |
| 08/18/1981 | USRE30711 Well completion method and system |
| 08/18/1981 | US4284943 Apparatus and method for controlling the speed of an induction motor in a closed-loop system |
| 08/18/1981 | US4284306 Apparatus and method of mining subterranean rubble piles |
| 08/18/1981 | US4284143 System for the remote control, the maintenance or the fluid injection for a submerged satellite well head |
| 08/18/1981 | US4284139 Process for stimulating and upgrading the oil production from a heavy oil reservoir |
| 08/18/1981 | US4284138 Coated screen jacket and coated pipe base assembly and method of making same |
| 08/18/1981 | CA1107194A1 Oxidized lignosulfonates as additives in oil recovery process involving chemical recovery agents |
| 08/18/1981 | CA1107048A1 Methods of treating subterranean well formations |
| 08/11/1981 | US4283159 Protective shroud for offshore oil wells |
| 08/11/1981 | US4283089 Injecting material capable of swelling coal |
| 08/11/1981 | US4283088 Thermal--mining method of oil production |
| 08/11/1981 | US4282940 Apparatus for perforating oil and gas wells |
| 08/11/1981 | US4282929 Method of controlling scale in oil recovery operations |
| 08/11/1981 | US4282928 Method for controlling permeability of subterranean formations |
| 08/11/1981 | CA1106661A1 Blast hole liner |
| 08/11/1981 | CA1106587A1 Microemulsions usable for the recovery of petroleum from high temperature deposits containing water with a high salt content |
| 08/04/1981 | US4282587 Method for monitoring the recovery of minerals from shallow geological formations |
| 08/04/1981 | US4281878 Method for loading explosive laterally from a borehole |
| 08/04/1981 | US4281877 Rock bolting techniques for forming an in situ oil shale retort |
| 08/04/1981 | US4281858 Selectively bridged expansion joint |
| 08/04/1981 | US4281716 Flexible workover riser system |
| 08/04/1981 | US4281713 Method and apparatus for monitoring the position and movement progress of the flame front in an underground combustion |
| 08/04/1981 | US4281711 Apparatus for positioning a liner on a tubular member in a well bore with a retrievable pack off bushing therebetween |
| 07/28/1981 | US4280559 Method for producing heavy crude |
| 07/28/1981 | US4280558 Sonic technique and system for facilitating the extraction of mineral material |
| 07/28/1981 | US4280557 Sonic apparatus for cleaning wells, pipe structures and the like |
| 07/28/1981 | CA1105694A1 Surfactant waterflooding employing amphoteric sulfonium sulfonates |
| 07/28/1981 | CA1105693A1 Non-aqueous acid emulsion composition and method for acid-treating siliceous geological formations |
| 07/28/1981 | CA1105692A1 Acid composition and method for acid treating geological formations |
| 07/21/1981 | US4279544 Helical apparatus for coupling submerged pipes |
| 07/21/1981 | US4279542 Subsea well flow lines tie-in using conductors |
| 07/21/1981 | US4279444 Drilling, detonation explosives |
| 07/21/1981 | US4279307 Natural gas production from geopressured aquifers |
| 07/21/1981 | US4279305 Process for stimulating a well with a saline surfactant sulfate, alkanol and acid system |
| 07/21/1981 | US4279302 Analyzing kerogen |
| 07/21/1981 | US4279301 Method for improving the effective permeability of formations |
| 07/21/1981 | CA1105379A1 Thermal-mining method of oil production |
| 07/21/1981 | CA1105378A1 Thermal-mining method of oil production |
| 07/21/1981 | CA1105377A1 Method of selectively heating kerogen in oil shale |
| 07/21/1981 | CA1105376A1 Method for production of organic products from kerogen |
| 07/21/1981 | CA1105375A1 Method for forming channels of high fluid conductivity in formation parts around a borehole |
| 07/21/1981 | CA1105374A1 Perforating gun for wells |
| 07/15/1981 | EP0031818A1 Methods and arrangements for casing a borehole |
| 07/14/1981 | US4278292 Clay stabilization in uranium leaching and restoration |
| 07/14/1981 | US4278137 Apparatus for extracting minerals through a borehole |
| 07/14/1981 | CA1104803A1 Hydrocarbon plugging solution containing titanium dioxide |
| 07/09/1981 | WO1981001864A1 Method and apparatus for collecting oil and gas from an underwater blow-out |
| 07/07/1981 | US4277348 Cleaning sand from filter in oil well in situ |
| 07/07/1981 | US4277202 Positioning of the end of an underwater flowline |
| 07/07/1981 | US4276935 Treatment of subsurface gas-bearing formations to reduce water production therefrom |
| 07/07/1981 | US4276933 Aqueous postflush with a nonionic solubilizer |
| 07/07/1981 | US4276932 Well casing hanger assembly |
| 07/07/1981 | US4276904 Adjustable flow rate controller for polymer solutions |
| 07/07/1981 | US4276778 Anaerobic sampling method |
| 07/07/1981 | CA1104492A1 No translation available |
| 07/07/1981 | CA1104491A1 No translation available |
| 07/07/1981 | CA1104489A1 In situ oil shale retorting |
| 06/30/1981 | US4275926 Down hole pump with bottom receptor |
| 06/30/1981 | US4275790 Surface controlled liquid removal method and system for gas producing wells |
| 06/30/1981 | US4275787 Method for monitoring subsurface combustion and gasification processes in coal seams |
| 06/30/1981 | CA1104055A1 Offshore installation and method of locating on a sea- bed base |
| 06/25/1981 | WO1981001735A1 A method for laying a flexible pipeline and pipeline to carry out this method |
| 06/23/1981 | US4274943 Removal of metal alkaryl sulfonates from hydrocarbons |
| 06/23/1981 | US4274664 Pipe joining device for underseas petroleum pipeline |
| 06/23/1981 | US4274487 Indirect thermal stimulation of production wells |
| 06/23/1981 | US4274486 Apparatus for and method of operating a well |
| 06/17/1981 | EP0030430A1 Underground gasification of coal |