| 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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| 01/02/1992 | EP0463211A1 Soil decontamination |
| 01/02/1992 | EP0386176B1 Installation for energy exchange between the ground and an energy exchanger |
| 01/01/1992 | CN2091947U Pumping unit for inclined straight well |
| 12/31/1991 | US5076727 In situ decontamination of spills and landfills by focussed microwave/radio frequency heating and a closed-loop vapor flushing and vacuum recovery system |
| 12/31/1991 | US5076364 Injecting carrier and alcohol |
| 12/31/1991 | US5076362 Subterranean formation permeability contrast correction methods |
| 12/31/1991 | US5076360 Priming methods for vacuum extraction wells |
| 12/31/1991 | US5076359 Method for gravel packing wells |
| 12/31/1991 | US5076357 Method of enhancing recovery of petroleum from an oil-bearing formation |
| 12/31/1991 | US5076355 Perforating gun with auger |
| 12/31/1991 | CA1293691C Well bore device for sand control |
| 12/30/1991 | CA2044989A1 Composition for dissolving sulfur and process for its use |
| 12/27/1991 | EP0462567A2 Horizontal well bore system |
| 12/25/1991 | CN2091350U No-rod plug compression mud pump |
| 12/24/1991 | US5074986 Electroosmosis techniques for removing materials from soil |
| 12/24/1991 | US5074362 Finger nut setting tool and liner hanger assembly |
| 12/24/1991 | US5074360 Method for repoducing hydrocarbons from low-pressure reservoirs |
| 12/24/1991 | US5074359 Method for hydraulic fracturing cased wellbores |
| 12/24/1991 | US5074358 Surfactant-stabilized foams for enhanced oil recovery |
| 12/24/1991 | US5074357 Process for in-situ enrichment of gas used in miscible flooding |
| 12/24/1991 | CA1293425C Method and apparatus for reduction of pressure in a liquid mixture |
| 12/22/1991 | CA2043943A1 Horizontal well bore system |
| 12/19/1991 | CA2043510A1 Method for decreasing mobility of dense carbon dioxide in subterranean formations |
| 12/18/1991 | EP0461963A1 Method and device for logging non-eruptive wells |
| 12/18/1991 | EP0461140A1 Improvements relating to the lining of pipelines or passageways. |
| 12/17/1991 | US5072990 Acceleration of hydrocarbon gas production from coal beds |
| 12/17/1991 | US5072791 Method of stabilizing formation prior to gravel packing |
| 12/17/1991 | CA1293185C Compound filters |
| 12/17/1991 | CA1293184C Organic crosslinking of polymers for co _flooding profile control |
| 12/17/1991 | CA1293117C Permeability stabilization in subterranean formations containing particulate matter |
| 12/16/1991 | CA2044559A1 Method and apparatus for selectively activating well tools from the surface |
| 12/12/1991 | WO1991018676A1 Multiple step cyclone separator |
| 12/12/1991 | CA2039381A1 Liquid hydrocarbon recovery process |
| 12/11/1991 | EP0249609B1 Process for increasing the degree of oil extraction |
| 12/11/1991 | EP0235268B1 Method and apparatus for reducing viscosity of high viscosity materials |
| 12/11/1991 | CN2090416U Hydraulic pulse vibrator |
| 12/10/1991 | US5072387 Method for determining a transit time for a radioactive tracer |
| 12/10/1991 | US5071890 In situ gelatin of phenolic resin with formation, polyvinyl alcohol polymer |
| 12/10/1991 | US5071496 Sensitive semifluid expolsve activated by a detonator for use in bore holes having pressure resistant closures |
| 12/10/1991 | US5071053 Method and device for joining well tubulars |
| 12/10/1991 | US5070950 Remote controlled actuation device |
| 12/10/1991 | US5070943 Apparatus and method for perforating a well |
| 12/10/1991 | US5070940 Apparatus for deploying and energizing submergible electric motor downhole |
| 12/10/1991 | US5070902 Lateral orifice water regulator |
| 12/10/1991 | US5070788 Methods and apparatus for disarming and arming explosive detonators |
| 12/06/1991 | CA2042450A1 Single horizontal well process for solvent/solute stimulation |
| 12/05/1991 | CA2018266A1 Method to produce energy and carbon dioxide |
| 12/04/1991 | EP0459883A2 Apparatus for arming, testing and sequentially firing a plurality of perforators |
| 12/04/1991 | EP0180619B1 Method and apparatus involving electromagnetic energy heating |
| 12/04/1991 | CN2089980U Underwell device for stake pressing crack acidification well |
| 12/04/1991 | CN2089979U Portal manipulator for high-pressure gas pressing crack firing |
| 12/04/1991 | CN1056674A Ceramic microspheres |
| 12/03/1991 | US5070457 Methods for design and analysis of subterranean fractures using net pressures |
| 12/03/1991 | US5069285 Dual wall well development tool |
| 12/03/1991 | US5069283 Subterranean formations |
| 12/03/1991 | US5069280 Gravel packer and service tool |
| 12/03/1991 | US5069279 Well structure having a screen element with wire supporting rods |
| 12/03/1991 | US5069278 Leakage control device |
| 12/03/1991 | US5069242 Gas lift valve utilizing a diaphragm pilot |
| 12/03/1991 | CA1292674C Method for thermal stimulation of a subterranean reservoir and apparatus therefor |
| 12/01/1991 | CA2043382A1 Method of enhancing recovery of petroleum from an oil-bearing formation |
| 11/28/1991 | WO1991017970A2 Low level blasting composition and method of blasting same |
| 11/27/1991 | EP0458090A2 Device for the treatment of contaminated soils by a gas |
| 11/27/1991 | EP0457813A1 A process for building a concrete structure in loose matter, from ground level, and equipment for carrying out said process. |
| 11/27/1991 | CN1056554A Energy-saving and buffering pneumatic balance oil-pumping machine |
| 11/26/1991 | US5068554 Electric motor |
| 11/26/1991 | US5067568 Well perforating gun |
| 11/26/1991 | US5067563 Spillproof oil well seal |
| 11/26/1991 | US5067429 Method for mooring and connecting an end of a flexible line with a conduit of a floating offshore edifice |
| 11/26/1991 | CA1292428C Method and apparatus for enhanced oil recovery |
| 11/24/1991 | CA2041679A1 System for treating gas that emanates from an area of contaminated ground |
| 11/22/1991 | CA2041979A1 Steam distribution manifold |
| 11/21/1991 | EP0457653A1 Safety sleeve and device for wells, particularly for a subterranean reservoir of fluid under pressure |
| 11/21/1991 | EP0457261A1 Apparatus for purification, for example of contaminated groundwater |
| 11/20/1991 | CN2089068U Energy storage type hydraulic pulse water ingection device |
| 11/19/1991 | WO1991018180A1 Preform device and processes for coating and/or lining a cylindrical volume |
| 11/19/1991 | US5066198 Gas lift valve |
| 11/19/1991 | US5066166 Apparatus for removing ground contaminants |
| 11/19/1991 | US5065821 Gas flooding with horizontal and vertical wells |
| 11/19/1991 | US5065819 Electromagnetic apparatus and method for in situ heating and recovery of organic and inorganic materials |
| 11/17/1991 | CA2042671A1 Low level blasting composition and method of blasting same |
| 11/13/1991 | EP0456424A2 Method of determining fracture characteristics of subsurface formations |
| 11/13/1991 | EP0456339A2 Determining fracture parameters for heterogeneous formations |
| 11/13/1991 | CN2088595U Composite petroleum extraction rod vibration damper |
| 11/12/1991 | WO1991018183A1 Underground fluid sampling system |
| 11/12/1991 | WO1991018182A1 Production systems for underwater wells |
| 11/12/1991 | US5063822 Perforating gun assembly including a carrier having a first section adapted to separate from a second section when a charge on the second section detonates |
| 11/12/1991 | US5063772 Method for troubleshooting gas-lift wells |
| 11/12/1991 | CA2082652A1 Production systems for underwater wells |
| 11/12/1991 | CA2082642A1 Underground fluid sampling system |
| 11/12/1991 | CA2042256A1 Safety sleeve for a borehole communicating with an underground reserve of fluid under pressure, and associated safety system, and an associated borehole operating method |
| 11/12/1991 | CA1291945C Modular near-surface completion system |
| 11/12/1991 | CA1291944C Method of recovering oil from heavy oil reservoirs |
| 11/12/1991 | CA1291867C Encapsulated breaker for cross-linked acid gel, fracture acidizing fluid containing same and method of use thereof |
| 11/06/1991 | EP0271564B1 Composition and method for slowly dissolving siliceous material |
| 11/06/1991 | CN2088163U Extended-range beam-pumping unit |
| 11/05/1991 | US5062485 Variable time delay firing head |
| 11/05/1991 | US5062484 Method of gravel packing a subterranean well |
| 11/05/1991 | US5062483 Treatment for reducing water coning in an oil reservoir |
| 11/05/1991 | US5062450 Valve body for oilfield applications |