| 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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| 07/17/1990 | CA1271703A1 Bitumen production through a horizontal well |
| 07/17/1990 | CA1271702A1 Chemical flooding and controlled pressure pulse fracturing process for enhanced hydrocarbon recovery from subterranean formations |
| 07/11/1990 | CN2059181U Pressure cracking device for oil layer |
| 07/11/1990 | CN1043767A Water dissolving exploit technology for mining glauberite |
| 07/11/1990 | CN1043766A Nitrogen stimulation of potassium hydroxide wellbore treatment |
| 07/10/1990 | US4940094 Method and device to actuate specialized intervention equipment in a drilled well having at least one section highly slanted with respect to a vertical line |
| 07/10/1990 | US4940093 Gravel packing tool |
| 07/10/1990 | US4940091 Crosslinking polyvinyl alcohol with phenolic resin formed in situ |
| 07/10/1990 | US4940090 Acrylamido-or sulfonated vinyl ether comonomer, enhanced oil recovery |
| 07/10/1990 | CA1271415A1 Double cylinder screen |
| 07/10/1990 | CA1271412A1 Enhanced oil recovery process utilizing in situ steam generation |
| 07/10/1990 | CA1271411A1 Process for recovering natural gas liquids |
| 07/10/1990 | CA1271410A1 Enhanced oil recovery process employing carbon dioxide |
| 07/10/1990 | CA1271408A1 Method and apparatus for firing borehole perforating apparatus |
| 07/09/1990 | CA2002037A1 Method for setting well casing using a resin coated particulate |
| 07/06/1990 | CA2006052A1 Underwater station for pumping a well flow |
| 07/04/1990 | CN2058933U Elliptic gear gearing device for oil pump |
| 07/04/1990 | CN1043539A Under well hot extractor for well oil pump |
| 07/03/1990 | US4938286 Method for formation stimulation in horizontal wellbores using hydraulic fracturing |
| 07/03/1990 | CA2006966A1 Temperature activated polymer for profile control |
| 07/03/1990 | CA2005853A1 Method for plugging a high permeability zone with a heat activated gel |
| 07/03/1990 | CA1271135A1 Retrievable well packer |
| 07/03/1990 | CA1271130A1 Method of and apparatus for increasing the mobility of crude oil in an oil deposit |
| 06/28/1990 | WO1990007048A1 Dual wall well development tool |
| 06/27/1990 | CN2058694U Movable steam injection tube |
| 06/27/1990 | CN2058693U Oil pump driven by whole rubber belt |
| 06/26/1990 | US4936386 Method for sealing well casings in the earth |
| 06/26/1990 | US4936385 Driving acid curable resin into wellbore, hardening, forming sieve |
| 06/21/1990 | DE3842740A1 Process for removing impurities from groundwater and a well for carrying out the process |
| 06/20/1990 | CN1043185A Method of determining depth of hydraulic fracuture zone in earth |
| 06/19/1990 | US4934871 Offshore well support system |
| 06/19/1990 | US4934466 Device for borehole hydraulic mining |
| 06/19/1990 | US4934458 Small diameter dual pump pollutant recovery system |
| 06/19/1990 | US4934450 Device for collecting oil samples |
| 06/14/1990 | CA2005605A1 Dual wall well development tool |
| 06/13/1990 | EP0373031A1 Homopolysaccharide and solution containing it, process for their preparation, and their use in the assisted recovery of petroleum |
| 06/13/1990 | EP0371976A1 A method and a plant for transport of hydrocarbons over a long distance from an offshore source of hydrocarbons. |
| 06/13/1990 | CN2058207U Solid acid delivery device for water filling well |
| 06/13/1990 | CN2058206U Slicing water-injection device |
| 06/12/1990 | US4932811 Well head conductor and/or caisson support system |
| 06/12/1990 | US4932474 Staged screen assembly for gravel packing |
| 06/12/1990 | US4932129 Casing punch for wells |
| 06/12/1990 | CA1270260A1 Process for the preparation of a low viscosity alkyl toluene or alkyl xylene sulfonate |
| 06/12/1990 | CA1270190A1 Valve means having multiple seats for supporting and locating submersible pumps in deep wells |
| 06/12/1990 | CA1270188A1 Process for selectively treating a subterranean formation using coiled tubing without affecting or being affected by the two adjacent zones |
| 06/08/1990 | CA2004527A1 Solvent stimulation of viscous oil via a horizontal wellbore |
| 06/07/1990 | CA2004759A1 Homopolysaccharide and solution containing the same; process for preparing them use for the supported recovering of oil |
| 06/06/1990 | CN2057953U Porous powder metallurgy sand-proof apparatus |
| 06/05/1990 | US4930577 Well sealing apparatus and method |
| 06/05/1990 | US4930576 Slurry mixing apparatus |
| 06/05/1990 | US4930574 Method for tertiary oil recovery from deep-well drill holes with utilization of the escaping petroleum gas |
| 06/05/1990 | CA1269925A1 Connector for well servicing system |
| 06/01/1990 | CA2003705A1 Dual firing system for a perforating gun |
| 05/31/1990 | WO1990005833A1 Device for closing off a complication zone in a well |
| 05/31/1990 | WO1990005832A1 Method of casing the production seam in a well |
| 05/31/1990 | WO1990005831A1 Pipe roller-expanding device |
| 05/30/1990 | EP0370744A1 A method of and apparatus for installing a casing under tension |
| 05/30/1990 | EP0370652A2 Downhole well tool valve |
| 05/30/1990 | EP0370606A2 Downhole well fluid sampling tool |
| 05/30/1990 | CN2057696U Vertical vortex separator with vortex entrance |
| 05/30/1990 | CN2057695U Flexible system pulley type beam-pumping unit |
| 05/30/1990 | CN1042584A Method and system for preventing sulphur deposition in high-h2s production wells |
| 05/30/1990 | CN1042583A Producing sour natural gas |
| 05/29/1990 | US4929348 Solvent extraction of soyben oil |
| 05/29/1990 | US4928771 Cable suspended pumping system |
| 05/29/1990 | US4928765 Method and apparatus for shale gas recovery |
| 05/29/1990 | US4928763 Method of treating a permeable formation |
| 05/29/1990 | US4928757 Hydraulic well penetration apparatus |
| 05/23/1990 | DE3908193A1 Appliance for fixing and sealing a Moineau pump (eccentric worm screw pump) in the riser of a liquid delivery probe |
| 05/23/1990 | CN2057456U Movable bumping block type stripping and linking device for sucker rod |
| 05/23/1990 | CN1042395A Oil production-assisting gas-lift liquid rod (jy) |
| 05/23/1990 | CN1042394A Blockage relieving rod for oil-gas well drainage |
| 05/23/1990 | CN1008128B Production of polyacrylamide solution used in oil recovery process |
| 05/23/1990 | CA2001347A1 Apparatus for firing borehole perforating apparatus |
| 05/22/1990 | US4926942 Method for reducing sand production in submersible-pump wells |
| 05/22/1990 | US4926941 Method of producing tar sand deposits containing conductive layers |
| 05/22/1990 | US4926940 Method for monitoring the hydraulic fracturing of a subsurface formation |
| 05/22/1990 | US4926938 Rotatable liner hanger with multiple bearings and cones |
| 05/22/1990 | US4926936 Multiple purpose liner hanger construction |
| 05/22/1990 | CA1269319A1 Methods for obtaining well-to-well flow communication |
| 05/17/1990 | DE3920800C1 Detoxifying soil in-situ - by introducing cleansing medium and vibrating using cylindrical chamber with 3 radial plate carrying tubes |
| 05/16/1990 | CN2057210U Microporous ceramic sand filter |
| 05/16/1990 | CN2057209U Bull wheel extended-range type stroke pumping oil unit |
| 05/16/1990 | CN1042227A Process for pumping multi-phase gas-liquid mixture by means of use of pump |
| 05/16/1990 | CN1042213A Porous powder metallurgic sand-proof apparatus |
| 05/16/1990 | CN1042212A Underground sucker rod lengthening apparatus |
| 05/16/1990 | CN1007997B Long stroke beam-pumping unit with chain without sliding beam |
| 05/15/1990 | US4924952 Detonating heads |
| 05/15/1990 | CA1269184A1 Stimulation of biooxidation processes in subterranean formations |
| 05/15/1990 | CA1269151A1 Fluid injection control system |
| 05/09/1990 | EP0367240A1 Adaptor for drilling strings with a controllable air passage |
| 05/09/1990 | CN2056939U Elastic oil pipe water jacket stove |
| 05/09/1990 | CN1041987A Automatic clearance pot |
| 05/08/1990 | US4923714 Novolac coated ceramic particulate |
| 05/08/1990 | US4923372 Gas lift type casing pump |
| 05/08/1990 | US4923333 Lysimeter for leak detection and method of assembly thereof |
| 05/08/1990 | US4923009 Steam enhanced oil recovery processes and compositions for use therein |
| 05/08/1990 | US4922758 Cell assembly for determining conductivity and permeability |
| 05/08/1990 | CA1268704A1 Pressure-controlled accumulator charging valve system for oil field downhole tools |
| 05/08/1990 | CA1268703A1 Well penetration apparatus and method |