| 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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| 06/05/1991 | EP0429512A1 Safety switch for explosive well tools |
| 06/05/1991 | CN2078370U Hollow sucker rod oil-extraction installation |
| 06/05/1991 | CN2078369U Distance increamental type chain oil pump |
| 06/05/1991 | CN1051959A Controllable and energy saving power unit for oil field pumping unit |
| 06/05/1991 | CN1051958A Casing valve |
| 06/04/1991 | US5020596 In situ method |
| 06/04/1991 | US5020595 Carbon dioxide-steam co-injection tertiary oil recovery process |
| 06/04/1991 | US5020591 Oil tool coupling device |
| 06/04/1991 | CA1284693C Method for concentrating surfactant from a brine solution |
| 05/31/1991 | CA2031105A1 Method to improve well performance in gravel packed wells |
| 05/28/1991 | US5019279 Process for enriching a gas |
| 05/28/1991 | US5018582 Hydraulic running and release tool with mechanical emergency release |
| 05/28/1991 | US5018581 Sand release apparatus and method |
| 05/28/1991 | US5018578 Method of arresting hydraulic fracture propagation |
| 05/28/1991 | US5018576 Process for in situ decontamination of subsurface soil and groundwater |
| 05/28/1991 | US5018575 Apparatus for reducing abrasion and corrosion in mandrels |
| 05/28/1991 | US5018396 Cell assembly for determining conductivity and permeability |
| 05/27/1991 | CA2016662A1 One-trip washdown system |
| 05/22/1991 | CN2077481U Rotating device of sucker rod with overload protector |
| 05/22/1991 | CN1051607A Method of well completion |
| 05/21/1991 | US5016717 Vacuum excavator |
| 05/21/1991 | US5016716 Tubing carried perforating gun with insulation jacket |
| 05/21/1991 | US5016714 Biocidal well treatment method |
| 05/21/1991 | US5016713 In-situ gelation in bottom zone for upward flow |
| 05/21/1991 | US5016710 Method of assisted production of an effluent to be produced contained in a geological formation |
| 05/21/1991 | US5016709 Process for assisted recovery of heavy hydrocarbons from an underground formation using drilled wells having an essentially horizontal section |
| 05/21/1991 | US5016708 Apparatus and method for producing and cleaning an oil well |
| 05/17/1991 | CA2028531A1 Enhanced oil recovery for oil reservoir underlain by water |
| 05/16/1991 | DE4035585A1 Pump system for extracting liq. specimens - has small dia. pumps in series of acid-resistant material with acid-resistant connections |
| 05/15/1991 | EP0427422A2 Casing valve |
| 05/15/1991 | EP0427371A1 Method of well completion |
| 05/15/1991 | CN2077023U Rigid bar beam-pumping unit |
| 05/14/1991 | US5015370 Apparatus and method for treating well water |
| 05/14/1991 | US5015162 Attachment for an oil well screw pump system |
| 05/14/1991 | US5015151 Motor controller for electrical submersible pumps |
| 05/14/1991 | US5014789 Method for startup of production in an oil well |
| 05/14/1991 | US5014788 Method of increasing the permeability of a coal seam |
| 05/14/1991 | US5014787 Single well injection and production system |
| 05/14/1991 | US5014785 Methane production from carbonaceous subterranean formations |
| 05/14/1991 | US5014784 Steamflooding in multi layered reservoirs |
| 05/14/1991 | US5014783 And displating oil from matrix block; enhanced oil recovery |
| 05/14/1991 | US5014779 Device for expanding pipes |
| 05/10/1991 | WO1991007570A1 Improved method for transporting particles in a porous medium |
| 05/08/1991 | EP0426427A2 Well completion method |
| 05/08/1991 | EP0425568A1 Apparatus and method for detonating well perforators. |
| 05/08/1991 | EP0353309A4 Method of constructing a well |
| 05/08/1991 | DE3937034A1 Decontamination of limited area of ground newly contaminated - with oil, etc., by forming concrete barrier below contamination and flushing with oil-absorbent fluid |
| 05/07/1991 | US5012868 Corrosion inhibition method and apparatus for downhole electrical heating in mineral fluid wells |
| 05/07/1991 | US5012864 Wellhead apparatus involving a free fall plunger in a well |
| 05/07/1991 | CA1283849C Downhole gaseous liquid flow agitator |
| 05/02/1991 | WO1991005938A1 A method and arrangement for installation of a well template on the sea floor |
| 05/02/1991 | WO1991005937A1 Downhole pump unseating apparatus and method |
| 05/01/1991 | CA2028924A1 Anti-sand bridge tool and method for dislodging sand bridges |
| 05/01/1991 | CA2028737A1 Method for setting well casing using a resin coated particulate |
| 04/30/1991 | US5011329 In situ soil decontamination method and apparatus |
| 04/30/1991 | US5010964 Method and apparatus for orienting wellbore perforations |
| 04/30/1991 | US5010953 Injecting polymerizable compound, diluent, catalyst, swelling polymer to form permeable barrier around oil well bore |
| 04/30/1991 | US5010910 Steam distribution manifold |
| 04/27/1991 | CA2028509A1 Method for using foams to improve alkaline flooding oil recovery |
| 04/24/1991 | EP0292548B1 Improvements relating to installation of downhole pumps in wells |
| 04/24/1991 | CN2075697U No-head sliding oil pump |
| 04/24/1991 | CN2075696U Pneumatic pump |
| 04/23/1991 | US5010527 Method for determining the depth of a hydraulic fracture zone in the earth |
| 04/23/1991 | US5009797 Method of supporting fractures in geologic formations and hydraulic fluid composition for same |
| 04/23/1991 | US5009266 Method for in situ contaminant extraction from soil |
| 04/23/1991 | US5009264 Well production apparatus including pump means and thermal absorption means |
| 04/18/1991 | WO1991005135A1 Phase fraction meter |
| 04/17/1991 | CN2075256U Apparatus for obtaining oil from deep well |
| 04/17/1991 | CN1012381B Process for increasing recovery of oil |
| 04/16/1991 | US5008664 Apparatus for inductively coupling signals between a downhole sensor and the surface |
| 04/16/1991 | US5007486 Perforating gun assembly and universal perforating charge clip apparatus |
| 04/16/1991 | US5007482 Offshore oil production system |
| 04/16/1991 | US5007344 Dual firing system for a perforating gun |
| 04/16/1991 | US5007277 Method for forming precision liquid/vapor separated bristle assembly |
| 04/16/1991 | CA1283042C Annulus pressure operated vent assembly |
| 04/16/1991 | CA1283041C Viscous oil recovery method |
| 04/16/1991 | CA1283040C Continuous process for hydraulic fracturing with foam |
| 04/12/1991 | WO1991005939A1 Progressive cavity drive train |
| 04/12/1991 | CA2044136A1 Progressive cavity drive train |
| 04/12/1991 | CA2026482A1 Foam injected into a gravity override zone for improved hydrocarbon production |
| 04/11/1991 | WO1991005935A1 Hydraulically actuated releasable connector and method for setting oil well liner |
| 04/11/1991 | CA2067227A1 Hydraulically actuated releasable connector and method for setting oil well liner |
| 04/10/1991 | EP0421822A2 Method and apparatus for single trip injection of fluid for well treatment and for gravel packing thereafter |
| 04/10/1991 | EP0421611A1 Method for selective plugging of a zone in a well |
| 04/10/1991 | EP0421068A1 Method for removing water-retensive liquids from a subterranean hollow space |
| 04/10/1991 | CN2074813U Jet gas lift device |
| 04/09/1991 | US5006584 Polydialkylsilalkylene polymer useful in enhanced oil recovery using carbon dioxide flooding |
| 04/09/1991 | US5006250 In-situ biodegradation of halogenated aliphatic compounds as impurities in underground water supply by microbacteria |
| 04/09/1991 | US5006133 Method and apparatus for deoxidation of sea-water |
| 04/09/1991 | US5005651 Downhole pump unseating apparatus and method |
| 04/09/1991 | US5005649 Multiple fracture production device and method |
| 04/09/1991 | US5005645 Method for enhancing heavy oil production using hydraulic fracturing |
| 04/09/1991 | US5005644 Steam enhanced oil recovery method using branched alkyl aromatic sulfonates |
| 04/09/1991 | US5005643 Method of determining fracture parameters for heterogenous formations |
| 04/09/1991 | US5005641 For treating a well penetrating subterraneanformation |
| 04/09/1991 | CA1282688C Well suspension assembly |
| 04/06/1991 | CA2000251A1 Method for recovering and partially upgrading bitumen from oil sands, tar sands, oil shales, h eavy oil reservoirs |
| 04/03/1991 | EP0420751A1 Procedure for pumping a gas/liquid mixture from an oil recovery well and device for carrying out such method |
| 04/03/1991 | EP0420656A2 Process and apparatus for two phase vacuum extraction of soil contaminants |
| 04/03/1991 | EP0298965B1 Process for tertiary oil extraction from deep boreholes with evaluation of the petroleum gas emerging therefrom |