| 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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| 06/16/1981 | US4273650 Apparatus and method for recovering pollutant liquids |
| 06/16/1981 | US4273615 Anaerobic digestion, explosion |
| 06/16/1981 | US4273470 Offshore production riser with flexible connector |
| 06/16/1981 | US4273469 System and method for laying subsea pipelines |
| 06/16/1981 | US4273193 Process for use in degasification of subterranean mineral deposits |
| 06/16/1981 | US4273192 Method for cleaning a sand screen |
| 06/16/1981 | US4273191 Simultaneous oil recovery and waste disposal process |
| 06/16/1981 | US4273190 Method and apparatus for gravel packing multiple zones |
| 06/16/1981 | US4273189 Method and apparatus for recovering natural gas from geopressured salt water |
| 06/16/1981 | US4273188 In situ combustion process for the recovery of liquid carbonaceous fuels from subterranean formations |
| 06/16/1981 | US4273047 Apparatus for perforating a well and its method of assembly |
| 06/10/1981 | EP0029842A1 Removing elemental sulfur from high temperature, high pressure wells |
| 06/09/1981 | US4272127 Subsidence control at boundaries of an in situ oil shale retort development region |
| 06/09/1981 | US4271905 Gaseous and solvent additives for steam injection for thermal recovery of bitumen from tar sands |
| 06/09/1981 | US4271904 Method for controlling underground combustion |
| 06/09/1981 | US4271696 Method of determining change in subsurface structure due to application of fluid pressure to the earth |
| 06/09/1981 | US4271676 Method and apparatus for recovering natural gas in a mine |
| 06/09/1981 | CA1102687A1 Method for establishing a combustion zone in an in situ oil shale retort having a pocket at the top |
| 06/09/1981 | CA1102686A1 High vertical conformance steam drive oil recovery method |
| 06/09/1981 | CA1102685A1 High vertical conformance oil recovery process |
| 06/09/1981 | CA1102684A1 High vertical conformance steam drive oil recovery method |
| 06/09/1981 | CA1102683A1 High conformance oil recovery process |
| 06/09/1981 | CA1102681A1 Retrogressively in-situ ore body chemical mining system and method |
| 06/09/1981 | CA1102680A1 Restoration of uranium solution mining deposits |
| 06/09/1981 | CA1102679A1 In situ leach method for recovering uranium and related values |
| 06/09/1981 | CA1102656A1 Concentrate for the preparation of oil and water microemulsions having high salinity which are stable at high temperature |
| 06/09/1981 | CA1102570A1 Sea-floor template |
| 06/09/1981 | CA1102541A1 Method of treating formation to remove ammonium ions |
| 06/09/1981 | CA1102540A1 Carbon dioxide foam flooding |
| 06/02/1981 | US4270884 Waste gas recovery system |
| 06/02/1981 | US4270802 In situ mining by injecting oxidizers after an ammonium sulfite or |
| 06/02/1981 | US4270775 Device for sealing the place of penetration of a pipeline in the wall of a submerged structure |
| 06/02/1981 | US4270611 Mooring station and transfer terminal for offshore hydrocarbon production |
| 06/02/1981 | US4270609 Mixtures of floating agents and transfer agents |
| 06/02/1981 | US4270608 Method and apparatus for gravel packing multiple zones |
| 06/02/1981 | CA1102234A1 Gaseous and solvent additives for steam injection for thermal recovery of bitumen from tar sands |
| 05/27/1981 | EP0029353A2 Apparatus for and method of testing and completing wells |
| 05/26/1981 | US4269449 Method for preparing an oil shale deposit for in situ retorting |
| 05/26/1981 | US4269278 Method and apparatus for completing a slanted wellbore |
| 05/26/1981 | US4269268 Hanger apparatus for suspending pipes with positive retrieval capability |
| 05/19/1981 | US4268403 Oil recovery using a dimethylamide in a fluid carrier |
| 05/19/1981 | US4268283 Fluid control means for geothermal wells |
| 05/19/1981 | US4267888 Method and apparatus for positioning a treating liquid at the bottom of a well |
| 05/19/1981 | US4267885 Method and apparatus for optimizing production in a continuous or intermittent gas-lift well |
| 05/14/1981 | WO1981001310A1 Method and column for collection and separation of oil,gas and water from blowing wells at the sea bed |
| 05/14/1981 | WO1981001276A1 Platform for oil recovery preparedness |
| 05/12/1981 | US4266886 Method and device for connecting a floating installation to an underwater installation through at least one flexible line |
| 05/12/1981 | US4266879 Fluid resonator |
| 05/12/1981 | US4266826 In-situ recovery of constituents from fragmented ore |
| 05/12/1981 | US4266613 Arming device and method |
| 05/12/1981 | US4266612 In situ recovery of shale oil |
| 05/12/1981 | US4266609 Method of extracting liquid and gaseous fuel from oil shale and tar sand |
| 05/12/1981 | US4266608 Method for detecting underground conditions |
| 05/12/1981 | US4266607 Method for protecting a carbon dioxide production well from corrosion |
| 05/12/1981 | CA1100937A1 Subsea drilling template with carousel guidance system |
| 05/05/1981 | US4265486 Apparatus for in-situ retorting |
| 05/05/1981 | US4265485 Thermal-mine oil production method |
| 05/05/1981 | US4265313 Mooring station and transfer terminal for offshore hydrocarbon production |
| 05/05/1981 | US4265312 Method for developing water wells |
| 05/05/1981 | US4265311 Methods of water flooding and fracturing using clean, non-damaging fracturing fluids |
| 05/05/1981 | US4265310 Fracture preheat oil recovery process |
| 05/05/1981 | US4265309 Evaluation and production of attic oil |
| 05/05/1981 | US4265307 Shale oil recovery |
| 05/05/1981 | CA1100318A1 Vmp riser horizontal bearing |
| 04/29/1981 | EP0027678A1 Method for recovering methane from coal seams |
| 04/28/1981 | US4264235 Method and apparatus for securing and releasing a flexible line in a pre-existing channel |
| 04/28/1981 | US4264104 Solution mining of deposits containing sodium and potassium chlorides, hydraulic fracturing |
| 04/28/1981 | US4263970 Introducing an oxidizing gas |
| 04/28/1981 | US4263969 Flame front control in underground combustion |
| 04/28/1981 | CA1100035A1 Uranium solution mining using potassium-containing solutions |
| 04/28/1981 | CA1100034A1 Subterranean mining |
| 04/28/1981 | CA1100033A1 Methods and apparatus for selectively operating multi- charge well bore guns |
| 04/28/1981 | CA1100032A1 Single well surfactant test to evaluate surfactant floods using multi tracer method |
| 04/21/1981 | US4262965 Triangular blasting into limited voids for vertical free face retorts |
| 04/21/1981 | US4262747 Methane and steam from brine |
| 04/21/1981 | US4262745 Steam stimulation process for recovering heavy oil |
| 04/21/1981 | CA1099602A1 Method for generating steam |
| 04/14/1981 | US4261422 Absorption of water by swellable clay particles in hydrocarbon liquid |
| 04/14/1981 | US4261421 Method for selectively acidizing the less permeable zones of a high temperature subterranean formation |
| 04/14/1981 | US4261420 Microbiological production of carbon dioxide which is injected under pressure into underground formation of crude oil |
| 04/14/1981 | US4261419 Underground recovery of natural gas from geopressured brines |
| 04/14/1981 | CA1099210A1 Enhanced oil recovery using electrical means |
| 04/14/1981 | CA1099088A1 Well treating composition and method |
| 04/08/1981 | EP0026353A2 Apparatus and method for connecting diverless subsea flowlines |
| 04/07/1981 | US4260193 Uranium mining, ion exchange removal of chloride ions |
| 04/07/1981 | US4260192 Recovery of magnesia from oil shale |
| 04/07/1981 | US4260022 Through the flow-line selector apparatus and method |
| 04/07/1981 | US4260018 Enhanced oil recovery |
| 04/07/1981 | US4260016 Self-cleaning helical spring sand screen |
| 04/07/1981 | CA1098819A1 Viscous oil recovery method |
| 04/07/1981 | CA1098818A1 Nuclear heating of oil-bearing formations |
| 04/02/1981 | WO1981000875A1 Device for collecting oil escaping accidentally from a underwater oil sheet |
| 03/31/1981 | US4258955 Process for in-situ leaching of uranium |
| 03/31/1981 | US4258954 Increasing flow rate of leachant by factor of at least two when concentration of idssolved mineral starts to decline |
| 03/31/1981 | US4258794 Underwater completion habitat |
| 03/31/1981 | US4258792 Hydraulic tubing tensioner |
| 03/31/1981 | US4258787 Subterranean well injection apparatus |
| 03/31/1981 | CA1098440A1 Method for forming channels of high fluid conductivity in formation parts around a borehole |
| 03/24/1981 | US4257895 Low gravity crude oil and water separator |
| 03/24/1981 | US4257650 Method for recovering subsurface earth substances |