| 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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| 09/18/1990 | US4957646 Steam foam surfactants enriched in alpha olefin disulfonates for enhanced oil recovery |
| 09/18/1990 | US4957393 In situ heating to detoxify organic-contaminated soils |
| 09/18/1990 | US4957165 Well treatment process |
| 09/18/1990 | US4957164 Enhanced oil recovery using flash-driven steamflooding |
| 09/18/1990 | US4957161 Device for pumping a fluid at the bottom of a well |
| 09/18/1990 | CA1274172A1 Method and apparatus for forming an insulated oil well casing |
| 09/18/1990 | CA1274171A1 Apparatus for enhanced oil recovery |
| 09/18/1990 | CA1274170A1 Gas flooding process for the recovery of oil from subterranean formations |
| 09/16/1990 | CA2011923A1 Hydraulically actuated liner hanger |
| 09/16/1990 | CA2008826A1 Pulsed in situ exothermic shock wave and retorting process for hydrocarbon recovery |
| 09/12/1990 | EP0387076A2 Offshore oil production system |
| 09/12/1990 | EP0386176A1 Installation for energy exchange between the ground and an energy exchanger. |
| 09/12/1990 | CN2061974U Gap-free microporous filting petroleum/sand separating tube |
| 09/12/1990 | CN2061973U Spporting rod type drip |
| 09/12/1990 | CN2061972U Cantilever wheel-shaft type pumping machine |
| 09/11/1990 | US4956535 Electrode systems for in situ vitrification |
| 09/11/1990 | CA1273867A1 Solvent enhanced fracture assisted steamflood process |
| 09/10/1990 | CA2011831A1 Apparatus and method for removing contaminants from the ground |
| 09/09/1990 | CA2011835A1 Offshore oil production system |
| 09/07/1990 | WO1990010173A1 Improvements relating to the lining of pipelines or passageways |
| 09/05/1990 | CN2061604U Long-stroke oil-well pump |
| 09/05/1990 | CN2061602U Multi-purpose pipe of motor-pumped well |
| 09/04/1990 | US4954266 Method and system for recovering free floating liquids from ground water |
| 09/04/1990 | US4953635 Method for improving the steam splits in a multiple steam injection process |
| 09/04/1990 | US4953619 Enhanced oil recovery process |
| 09/04/1990 | US4953618 Apparatus for use on a well |
| 09/04/1990 | CA1273564A1 Stimulating subterranean formations in the open hole |
| 09/03/1990 | CA2010167A1 Consolidated proppant pack for producing formations |
| 08/29/1990 | EP0301060B1 Device for opening gas sources in refuse tips, and for exploring and cleansing materials for recycling and contaminated ground |
| 08/29/1990 | EP0271566B1 Riser tensioner |
| 08/29/1990 | EP0204823B1 Side pocket mandrel |
| 08/29/1990 | CN2061207U Controllable energy-saving oil pump power device for oil field |
| 08/29/1990 | CN1009383B Drilling hydraulic mining fixed-point producing method for salt deposit |
| 08/28/1990 | US4951921 Water soluble polymers for subterranean wellbores |
| 08/28/1990 | US4951760 Remote control actuation device |
| 08/28/1990 | US4951752 Removing fluids from a wellbore |
| 08/28/1990 | US4951751 Diverting technique to stage fracturing treatments in horizontal wellbores |
| 08/28/1990 | US4951750 Method and apparatus for single trip injection of fluid for well treatment and for gravel packing thereafter |
| 08/28/1990 | US4951748 Technique for electrically heating formations |
| 08/28/1990 | US4951744 Angularly shaped unitary structured base strip comprised of a specific material adapted for phasing charges in a perforating gun |
| 08/28/1990 | CA1273287A1 Use of ball sealers in co.sub.2 or steam injection wells |
| 08/28/1990 | CA1273286A1 Device for inserting a tool or an apparatus in a conduit for downhole exploitation of autonomous hydraulic pumps, in use for production through a tubing |
| 08/22/1990 | EP0383585A1 Fluid flow volumetric determination apparatus and method |
| 08/22/1990 | CN2060810U Deep-well water-carriage device without pipe |
| 08/22/1990 | CN1044844A Stabilized sulfur dissolving compositions |
| 08/22/1990 | CN1044843A Dual-belt, dual-cylinder and long-stroke beam-pumping unit |
| 08/21/1990 | US4950995 Method of treating a well bore in connection with electric logging of subsurface formation |
| 08/21/1990 | US4950892 Method and tool for gravel pack evaluation |
| 08/21/1990 | US4950698 Composition for selective placement of polymer gels for profile control in thermal oil recovery |
| 08/21/1990 | US4950394 Arrangement for driving out volatile impurities from ground water |
| 08/21/1990 | US4949793 Method and apparatus for completion of a well |
| 08/21/1990 | US4949788 Well completions using casing valves |
| 08/16/1990 | EP0381853A2 Stabilized sulfur dissolving compositions |
| 08/15/1990 | CN2060474U Sucker rod connecting hoop ball wear-resistant device |
| 08/14/1990 | US4948394 Introduction of a polar solvent and compression of gas-liquid mixture, separation and transportation |
| 08/14/1990 | US4947936 Well unit dynamometer installation means and method |
| 08/14/1990 | US4947933 In situ gelation of phenolic resin |
| 08/14/1990 | CA2009939A1 Fluid flow volumetric determination apparatus and method |
| 08/14/1990 | CA1272682A1 Side pocket mandrel |
| 08/14/1990 | CA1272680A1 Downhole steam generator |
| 08/14/1990 | CA1272679A1 Distillative processing of co.sub.2 and hydrocarbons for enhanced oil recovery |
| 08/13/1990 | CA2006315A1 Perforating gun pressure bleed device |
| 08/09/1990 | WO1990008855A1 A process for building a concrete structure in loose matter, from ground level, and equipment for carrying out said process |
| 08/09/1990 | WO1990008585A1 Device for regulating and reducing a polyphasic flow, and its use |
| 08/09/1990 | CA2008561A1 Stabilized sulfur dissolving compositions |
| 08/07/1990 | US4946578 Process for treating hydrocarbons |
| 08/07/1990 | US4946312 Apparatus for opening up garbage dumping ground gas sources and for the exploration and sanification of old deposit site burdens and contaminated soils |
| 08/07/1990 | US4946310 Dome for waste dumps |
| 08/07/1990 | US4945995 Process and device for hydraulically and selectively controlling at least two tools or instruments of a valve device allowing implementation of the method of using said device |
| 08/07/1990 | US4945994 Inverted wellbore completion |
| 08/07/1990 | US4945992 Injecting an aqueous solution of chlorine dioxide under pressure into a well |
| 08/07/1990 | US4945991 Method for gravel packing wells |
| 08/07/1990 | US4945990 Polymer containing pendant vinyl ether groups useful in enhanced oil recovery using CO2 flooding |
| 08/07/1990 | US4945989 Polymer containing pendant tertiary alkyl amine groups useful in enhanced oil recovery using CO2 flooding |
| 08/07/1990 | US4945988 Apparatus and process for removing volatile contaminants from below ground level |
| 08/07/1990 | US4945986 Constant head pump for sonic wave generator used in treating subsurface formations |
| 08/07/1990 | US4945984 Igniter for detonating an explosive gas mixture within a well |
| 08/07/1990 | US4945758 Method and apparatus for monitoring the interior surface of a pipeline |
| 08/07/1990 | CA1272442A1 Method for the grit-free withdrawal of water from a well and also a device suitable therefor |
| 08/01/1990 | EP0379743A1 Method for cleaning soil by conducting through a heated medium |
| 08/01/1990 | CN1009023B Oil drawer with self changing torque |
| 07/31/1990 | US4944905 Particulate ceramic useful as a proppant |
| 07/31/1990 | US4944348 Gravel packing assembly |
| 07/31/1990 | US4944225 Method and apparatus for firing exploding foil initiators over long firing lines |
| 07/31/1990 | CA2005460A1 Consolidation of hydraulic fractures employing a polyurethane resin |
| 07/31/1990 | CA1272121A1 Single zone gravel packing system |
| 07/25/1990 | EP0379236A1 Method for treating subterranean formations |
| 07/25/1990 | CN1044147A Process for simulating obtaining hydrocarbon by pilot test in deposit |
| 07/25/1990 | CN1044146A Double pendulum long-stroke beam-pumping unit |
| 07/24/1990 | US4943305 Aerating apparatus for expelling volatile impurities from ground water |
| 07/24/1990 | US4943210 Pump control system, level sensor switch and switch housing |
| 07/24/1990 | US4942926 Device and method for carrying out operations and/or manipulations in a well |
| 07/24/1990 | US4942925 Liner isolation and well completion system |
| 07/24/1990 | US4942924 Liner setting assembly and method |
| 07/24/1990 | CA1271955A1 Low actuation pressure bar vent |
| 07/18/1990 | EP0377806A2 Method for setting well casing using a resin coated particulate |
| 07/17/1990 | US4941982 Calcium-free clear high density fluids |
| 07/17/1990 | US4941819 Air circulation and exhaust control system for commercial ovens |
| 07/17/1990 | US4941533 Subterranean permeability modification by using microbial polysaccharide polymers |
| 07/17/1990 | CA1271704A1 Wellhead drilling and completion apparatus |