| 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) |
|---|
| 01/22/1991 | US4986361 Well casing flotation device and method |
| 01/22/1991 | US4986356 Method of removing polymer gels from a petroleum reservoir |
| 01/22/1991 | US4986352 Intermittent steam injection |
| 01/22/1991 | CA1279315C Stabilizing polysaccharide solutions for tertiary oil recovery at elevated temperature |
| 01/22/1991 | CA1279258C Viscous oil recovery method |
| 01/22/1991 | CA1279257C Patterns having horizontal and vertical wells |
| 01/22/1991 | CA1279256C Rotating and supporting drive assembly for down hole rotary pumps |
| 01/22/1991 | CA1279181C Composition and method for slowly dissolving siliceous material |
| 01/22/1991 | CA1279180C2 Process utilizing a polysaccharide polymer |
| 01/17/1991 | DE3921949A1 Burner for burning gas given off from refuse dump - has burner head mounted telescopically over perforated pipe |
| 01/16/1991 | EP0408324A2 A method for stimulating a formation penetrated by a horizontal wellbore |
| 01/16/1991 | EP0407408A1 Process and installation for recuperation of energy from oil wells. |
| 01/16/1991 | EP0275304B1 Calcium-free clear high density fluids |
| 01/16/1991 | EP0197947B1 Improved penetration conductor pipe drive shoe |
| 01/16/1991 | CN2069479U Rotary type gas-lift separator |
| 01/16/1991 | CN2069478U Vehicular hydraulic long stroke energy-saving oil-pumping unit |
| 01/16/1991 | CN1048564A Ionic type rare earth ore in-situ lixiviation processing |
| 01/15/1991 | US4984969 Lifting fluid from wells |
| 01/15/1991 | US4984635 Forming a rigid foam by injecting a foamable thermosetting resin or prepolymer |
| 01/15/1991 | US4984634 Logging of subterranean wells using coiled tubing |
| 01/15/1991 | US4984520 Enclosed perforating gun with expendable carrier |
| 01/15/1991 | CA2020860A1 Method for stimulating a formation penetrated by a horizontal wellbore |
| 01/15/1991 | CA1279062C Method and apparatus for moving a pipe through a j-tube |
| 01/15/1991 | CA1278956C Dry and/or wet one-atmosphere underwater system |
| 01/12/1991 | CA2018146A1 Carbon dioxide-steam co-injection tertiary oil recovery process |
| 01/10/1991 | WO1990012196A3 Method and apparatus for monitoring well fluid parameters |
| 01/10/1991 | DE3920392A1 Verfahren zum abbau und zur foerderung einer unter wasser lagernden bodenschicht und vorrichtung zur durchfuehrung des verfahrens A method for degrading and foerderung a ground layer overlying underwater and apparatus for performing the method |
| 01/09/1991 | CN1048436A Gas pressure balance and safety in pumping unit |
| 01/09/1991 | CN1011151B Oil recovery compositions |
| 01/08/1991 | US4983277 Filtering to remove mercuric sulfide, followed by hydrogen sulfide absorption |
| 01/08/1991 | US4982794 Hydrocarbons |
| 01/08/1991 | US4982792 Method to reduce movement of a CPF device via a shear-thickening fluid |
| 01/08/1991 | US4982791 Protection of wellbore and equipment during controlled pulsation fracturing |
| 01/08/1991 | US4982790 Method to reduce movement of a CPF device via a gelled petroleum based fluid |
| 01/08/1991 | US4982789 Preventing surfactant loss to the formation |
| 01/08/1991 | US4982788 Apparatus and method for removing volatile contaminants from the ground |
| 01/08/1991 | US4982786 Use of CO2 /steam to enhance floods in horizontal wellbores |
| 01/08/1991 | CA1278747C Method of controlling permeability damage of hydrocarbon formations during steam injection using ammonium ions, bicarbonate ions, and potassium ions |
| 01/02/1991 | CN2068582U Quick detachable protecting wire of casing |
| 01/02/1991 | CN1048241A Industrializing production process of high-efficiency hydrochloric acid oil field meso-thermal acidization corrosion inhibitor |
| 01/02/1991 | CA1278511C Process for extracting oil from an oil well and for utilising the issuing petroleum gas |
| 01/02/1991 | CA1278510C Method for hydraulic fracture propagation in hydrocarbon bearingformations |
| 01/02/1991 | CA1278509C Hydraulic well penetration apparatus and method |
| 01/02/1991 | CA1278493C Method and apparatus for transporting unprocessed well streams |
| 01/01/1991 | US4981176 Anionic surfactants |
| 01/01/1991 | US4981175 Recirculating gas separator for electric submersible pumps |
| 12/27/1990 | EP0404686A1 Pump apparatus including a firing head for use with a perforating gun on a tubing string |
| 12/27/1990 | EP0404669A1 Method and apparatus for conducting perforating operations in a well |
| 12/27/1990 | EP0404489A2 Well treatment process |
| 12/26/1990 | CN2068147U Air-lift recovery device |
| 12/25/1990 | US4980077 Method for removing alkaline sulfate scale |
| 12/25/1990 | US4979880 Apparatus for pumping well effluents |
| 12/25/1990 | US4979567 Method and apparatus for selective retraction of a tubing carried perforating gun |
| 12/25/1990 | US4979565 Method to improve well performance in gravel packed wells |
| 12/21/1990 | CA2016720A1 Constant head pump for sonic wave generator used in treating subsurface formations |
| 12/19/1990 | EP0402996A1 Method for gravel packing a well |
| 12/19/1990 | CN2067750U Power-saving microcomputer controller for oil pumping unit |
| 12/19/1990 | CN1010865B Extracting method of particular oil |
| 12/19/1990 | CN1010863B Well bore recompletion |
| 12/18/1990 | US4978370 Method and apparatus for reduction of the pressure in a liquid mixture |
| 12/18/1990 | US4978172 Gob methane drainage system |
| 12/18/1990 | US4977961 Method of recovering hydrocarbons from a subterranean formation |
| 12/18/1990 | US4977959 Method of positioning of plugs or screens by horizontal drilling |
| 12/18/1990 | US4977958 Downhole pump filter |
| 12/18/1990 | CA1277936C Microbial process for selectively plugging a subterranean formation |
| 12/18/1990 | CA1277824C Miscible gas enhanced oil recovery method using oil-brine compatible pre-formed foam |
| 12/15/1990 | CA2018739A1 Oil-wetting treatment for reducing water coning in an oil reservoir |
| 12/15/1990 | CA2013862A1 Well unit dynamometer installation means and method |
| 12/13/1990 | DE4001011C1 Ground water flow control - comprises shaft sunk into ground water levels with successive permeable and impermeable wall areas |
| 12/12/1990 | EP0402239A1 Device for extracting a liquid from a long pipe |
| 12/12/1990 | EP0401431A1 Formation fracturing process |
| 12/12/1990 | CN2067318U Dual-purpose tubing pump capable of injecting gas and pumping oil repeatedly |
| 12/12/1990 | CN1047631A Removal of hydrogen sulfide with on site generated sulfite |
| 12/12/1990 | CA2008752A1 Method for gravel packing a well |
| 12/11/1990 | US4977116 Method for making lightweight proppant for oil and gas wells |
| 12/11/1990 | US4976322 Method of construction of multiple-string wells |
| 12/11/1990 | US4976318 Technique and apparatus for stimulating long intervals |
| 12/11/1990 | CA1277590C Disposal of produced formation fines during oil recovery |
| 12/06/1990 | DE4017775A1 Verfahren und vorrichtung zum ausbau eines unterirdischen bohrloches Method and apparatus for the expansion of a subterranean well |
| 12/06/1990 | DE3917688A1 Drainage pipe advance system for dug wells - uses drilling rods, with drilling head and retainer jaws for pipe |
| 12/05/1990 | EP0400137A1 Dual wall well development tool |
| 12/05/1990 | CN2066764U Water filter structure of mechanical (electric) well |
| 12/04/1990 | US4975208 With fluorocarbon surfactants |
| 12/04/1990 | US4974690 Adapter for drilling strings with controllable air passage |
| 12/04/1990 | US4974677 Profile control process for use under high temperature reservoir conditions |
| 12/04/1990 | US4974675 Method of fracturing horizontal wells |
| 12/04/1990 | US4974674 Extraction system with a pump having an elastic rebound inner tube |
| 12/04/1990 | US4974673 System for the production of crude oil by the injection of treatment fluids |
| 12/04/1990 | US4974672 Gravel packing system for a production radial tube |
| 12/04/1990 | CA1277229C Gas lift system |
| 12/04/1990 | CA1277227C Method for foam emplacement in carbon dioxide enhanced recovery |
| 12/04/1990 | CA1277129C Pyrolytic carbon coating of media improves gravel packing and fracturing capabilities |
| 12/02/1990 | CA2018054A1 Apparatus for completion of a subterranean well |
| 12/01/1990 | CA2018008A1 Removal of hydrogen sulfide with on site generated sulfite |
| 11/29/1990 | WO1990014496A1 Subterranean permeability modification by using microbial polysaccharide polymers |
| 11/28/1990 | EP0399771A1 Residue recovery system |
| 11/28/1990 | EP0399426A1 Method and apparatus for taking uncontaminated water samples from a well by drilling |
| 11/28/1990 | EP0399393A2 Apparatus for the removal by suction of air enriched with gaseous impurities from an area of contaminated soil |
| 11/28/1990 | CN2066486U Swing type weight balancer |
| 11/27/1990 | US4973811 In situ decontamination of spills and landfills by radio frequency induction heating |