| 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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| 03/24/1981 | US4257482 Sonic gravel packing method and tool for downhole oil wells |
| 03/24/1981 | CA1098220A1 Method for investigating the front profile during flooding of formations |
| 03/24/1981 | CA1098062A1 Process for the recovery of organic gases from ground, bedrock or bottom sediments in lakes |
| 03/24/1981 | CA1098029A1 Process for recovery of mineral values from underground formations |
| 03/10/1981 | US4254832 Sampler and measurement apparatus |
| 03/10/1981 | US4254831 Method and apparatus for restoring and maintaining underground aquifer water system |
| 03/10/1981 | US4254828 Apparatus for producing fractures and gaps in geological formations for utilizing the heat of the earth |
| 03/10/1981 | US4254728 Device for mooring and connecting a submarine conduit, and method employing the said device |
| 03/10/1981 | CA1097212A1 Solution mining method utilizing dissolved oxygen |
| 03/10/1981 | CA1097211A1 Process for recovering uranium and other base metals |
| 03/10/1981 | CA1097054A1 Correlation of weighted effect of different ions and surfactant composition for surfactant flood |
| 03/10/1981 | CA1097053A1 Surfactants to reduce flood water mobility |
| 03/03/1981 | US4253523 Method and apparatus for well perforation and fracturing operations |
| 03/03/1981 | US4253522 Gravel pack tool |
| 03/03/1981 | CA1096768A1 Starting hydrocarbon fluid production by injecting nitrogen-generating liquid |
| 03/03/1981 | CA1096598A1 Scavenging hydrogen sulfide in an oil well |
| 02/25/1981 | EP0024148A1 Separator for oil, gas and water |
| 02/24/1981 | US4252706 Method for precisely controlling the dissolution rate of high molecular weight water-soluble vinyl polymers |
| 02/24/1981 | US4252657 Comprising three anionic surfactants and a cosurfactant; enhanced oil recovery |
| 02/24/1981 | US4252374 Determining the locus of a processing zone in an oil shale retort by shale oil composition |
| 02/24/1981 | US4252196 Control tool |
| 02/24/1981 | US4252194 Method of using polymerized lignosulfonates for mobility control |
| 02/24/1981 | US4252191 Method of recovering petroleum and bitumen from subterranean reservoirs |
| 02/24/1981 | US4252189 Vibratory method for minimg shale oil or the like |
| 02/24/1981 | CA1096301A1 Operation of an in situ oil shale retort |
| 02/24/1981 | CA1096300A1 In situ recovery of shale oil |
| 02/24/1981 | CA1096299A1 In situ oil shale retort |
| 02/24/1981 | CA1096298A1 Fluid resonator |
| 02/24/1981 | CA1096180A1 Method and apparatus for recovering metal values from deep-lying ores by in-situ mining |
| 02/24/1981 | CA1096153A1 Surfactant oil recovery process usable in high temperature, high salinity formations |
| 02/17/1981 | US4251191 Method for lifting oil in a well |
| 02/17/1981 | US4250965 Well treating method |
| 02/17/1981 | US4250964 Injecting cyclohexene or cyclohexadiene to reduce viscosity |
| 02/17/1981 | US4250963 Selective permeability reduction with polymerizable monomers around steam injection wells |
| 02/17/1981 | US4250962 In situ combustion process for the recovery of liquid carbonaceous fuels from subterranean formations |
| 02/17/1981 | US4250961 Oil recovery method utilizing a surfactant slug driven by water of a controlled salinity |
| 02/17/1981 | CA1095831A1 Fragmentation of subterranean formations |
| 02/10/1981 | US4250230 Generating electricity from coal in situ |
| 02/10/1981 | US4249833 Method of depressurizing a leached salt cavern |
| 02/10/1981 | US4249777 Method of in situ mining |
| 02/10/1981 | US4249776 Method for optimal placement and orientation of wells for solution mining |
| 02/10/1981 | US4249775 Mining of sulphur |
| 02/10/1981 | US4249609 Method for forming channels of high fluid conductivity in formation parts around a borehole |
| 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 |
| 02/10/1981 | US4249604 Recovery method for high viscosity petroleum |
| 02/10/1981 | US4249603 Doping a retort with radioactive nuclides to determine the locus of a processing zone |
| 02/10/1981 | US4249602 Method of doping retort with a halogen source to determine the locus of a processing zone |
| 02/10/1981 | US4249601 Hydraulic running tool for liner hangers |
| 02/10/1981 | US4249598 Outdoor well depth indicator |
| 02/10/1981 | US4249292 Method of assembling self-cleaning helical spring filter |
| 02/10/1981 | CA1095403A1 Methods and apparatus for anchoring offshore pipeline |
| 02/10/1981 | CA1095400A1 In situ processing of organic ore bodies |
| 02/10/1981 | CA1095274A1 Working and method for the storage of a product with a clotting point above ambient temperature |
| 02/10/1981 | CA1095227A1 Abandoned borehole compositions |
| 02/10/1981 | CA1095226A1 Oil recovery process utilizing aromatic solvent and steam |
| 02/03/1981 | US4248717 Method for removing elemental sulfur from high temperature, high pressure wells and flow lines |
| 02/03/1981 | US4248308 Externally adjusted spring actuated well valve |
| 02/03/1981 | US4248307 Latch assembly and method |
| 02/03/1981 | US4248306 By pumping oil into a subterranean boiler unit; distillation, cracking |
| 02/03/1981 | US4248305 Aquifer recharge using natural energy |
| 02/03/1981 | US4248303 Explosive well-fracturing system |
| 02/03/1981 | US4248302 Method and apparatus for recovering viscous petroleum from tar sand |
| 02/03/1981 | US4248300 Method of and apparatus for positioning retrievable landing nipple in a well bore string |
| 02/03/1981 | CA1094947A1 Process for the in-situ leaching of uranium |
| 02/03/1981 | CA1094946A1 Method and apparatus for mixing gaseous oxidant and lixiviant in an in situ leach operation |
| 02/03/1981 | CA1094944A1 High density jet perforating casing gun |
| 02/03/1981 | CA1094826A1 Method and apparatus for recuperating hard to pump materials |
| 01/28/1981 | EP0023126A1 Electric well pump |
| 01/27/1981 | US4247228 Dump truck or trailer with pneumatic conveyor |
| 01/27/1981 | US4246996 Screw operated coupling |
| 01/27/1981 | US4246966 Production and wet oxidation of heavy crude oil for generation of power |
| 01/27/1981 | US4246965 Method for operating an in situ oil shale retort having channelling |
| 01/27/1981 | US4246964 Down hole pump and testing apparatus |
| 01/27/1981 | CA1094608A1 Method and appartus for handling fluids in a two- phase flow pipeline system |
| 01/27/1981 | CA1094447A1 Method and system for controlling sand in thermal recovery of oil from tar sands |
| 01/22/1981 | WO1981000132A1 Methods and arrangements for casing a borehole |
| 01/20/1981 | USRE30484 Zonal fracture treatment of well formations |
| 01/20/1981 | US4245865 Explosive expansion to a limited void with uniform scaled depth of burial |
| 01/20/1981 | US4245702 Method for forming channels of high fluid conductivity in hard acid-soluble formations |
| 01/20/1981 | US4245701 Apparatus and method for igniting an in situ oil shale retort |
| 01/20/1981 | US4245699 Method for in-situ recovery of methane from deeply buried coal seams |
| 01/20/1981 | CA1093958A1 Method for underground gasification of coal |
| 01/14/1981 | EP0022357A1 Down-hole separator for separating oil and water in a well |
| 01/13/1981 | US4244684 Method for controlling corrosion in thermal vapor injection gases |
| 01/13/1981 | US4244425 Low density ball sealers for use in well treatment fluid diversions |
| 01/13/1981 | CA1093520A1 Mixture concentrator |
| 01/13/1981 | CA1093519A1 Mixture concentrator |
| 01/13/1981 | CA1093462A1 Method of forming in situ oil shale retorts |
| 01/13/1981 | CA1093461A1 Method of disposing solid sodium chloride while selectively solution mining potassium chloride |
| 01/13/1981 | CA1093459A1 Well perforating tool |
| 01/06/1981 | US4243638 Iron EDTA chelate catalyzed oxidation of uranium |
| 01/06/1981 | US4243528 Treater for mechanically breaking oil and water emulsions of a production fluid from a petroleum well |
| 01/06/1981 | US4243102 Method and apparatus for flowing fluid from a plurality of interconnected wells |
| 01/06/1981 | US4243101 Coal gasification method |
| 01/06/1981 | US4243100 Operation of in situ oil shale retort with void at the top |
| 01/06/1981 | CA1093131A1 Electrode well for electrically heating a subterranean formation |
| 01/06/1981 | CA1093092A1 Process for making ether sulfonates |
| 01/06/1981 | CA1092966A1 Method of oil recovery employing enriched gas drive with control of evolved gas |
| 01/06/1981 | CA1092965A1 Method of recovering coal in aqueous slurry form |