| 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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| 07/25/1989 | US4850431 Method of forming a plurality of spaced substantially parallel fractures from a deviated well bore |
| 07/25/1989 | US4850430 Matched particle/liquid density well packing technique |
| 07/25/1989 | US4850429 Recovering hydrocarbons with a triangular horizontal well pattern |
| 07/25/1989 | US4850392 Double poppet relief valve |
| 07/19/1989 | EP0324568A2 Water soluble polymers for detergent compositions |
| 07/19/1989 | EP0324003A1 Method and apparatus for cleaning wells |
| 07/19/1989 | CN1034035A Internally installed fluid magnetic core |
| 07/18/1989 | US4848966 Arrangement in a production platform |
| 07/18/1989 | US4848949 Device and method for remotely positioning and connecting an end of an elongate element to a connector |
| 07/18/1989 | US4848475 Sea bed process complex |
| 07/18/1989 | US4848474 Modular subsea station on a monopodial structure |
| 07/18/1989 | US4848472 Insert choke and control module therefor |
| 07/18/1989 | US4848471 Method and apparatus for transporting unprocessed well streams |
| 07/18/1989 | US4848469 Liner setting tool and method |
| 07/18/1989 | US4848468 Fractureing fluid of water flowing agent and surfactant |
| 07/18/1989 | US4848467 Degradation of hydroxyacetic acid condensation product |
| 07/18/1989 | US4848466 Enhanced oil recovery using a three-stage injection of solvent and water |
| 07/18/1989 | US4848464 Injection solidifiable gel mixture |
| 07/18/1989 | US4848462 Rotatable liner hanger |
| 07/18/1989 | US4848461 Method of evaluating fracturing fluid performance in subsurface fracturing operations |
| 07/18/1989 | US4848460 Contained recovery of oily waste |
| 07/18/1989 | US4848459 Apparatus for installing a liner within a well bore |
| 07/18/1989 | US4848145 In-situ linear flow proppant conductivity test cell |
| 07/18/1989 | US4848085 Oil-well pumping system or the like |
| 07/18/1989 | CA1257701A1 Method of avoiding stuck drilling equipment |
| 07/18/1989 | CA1257539A1 Flexible production riser assembly |
| 07/18/1989 | CA1257537A1 Insitu wet combustion process for recovery of heavy oils |
| 07/18/1989 | CA1257536A1 Method of completing production wells for the recovery of gas from coal seams |
| 07/13/1989 | DE3842747A1 Verfahren zur bestimmung der konzentration von polyacrylsaeure in einer loesung mit mehrwertigen kationen Method for the determination of the concentration of polyacrylic acid in a spoon with polyvalent cations |
| 07/12/1989 | CN2040953U Series pump device |
| 07/12/1989 | CN1004764B Enhanced oil recovery |
| 07/11/1989 | US4846647 Air circulation and exhaust control system for commercial ovens |
| 07/11/1989 | US4846281 Dual flapper valve assembly |
| 07/11/1989 | US4846280 Drill stem test method and apparatus |
| 07/11/1989 | US4846277 In situ nitrogen foaming |
| 07/11/1989 | US4846276 Water-alternating-gas flooding of a hydrocarbon-bearing formation |
| 07/11/1989 | US4846275 Recovery of heavy crude oil or tar sand oil or bitumen from underground formations |
| 07/11/1989 | US4846274 Process for recovering hydrocarbon |
| 07/11/1989 | US4845981 System for monitoring fluids during well stimulation processes |
| 07/11/1989 | CA1257422A1 Organic titanium compositions and their use as cross- linkers |
| 07/11/1989 | CA1257329A1 Method and means for obtaining data representing a parameter of fluid flowing through a down hole side of an oil or gas well bore |
| 07/05/1989 | EP0323307A1 Process for transporting a fluid which forms hydrates |
| 07/05/1989 | EP0322958A2 Method and appararus for producing viscous crudes |
| 07/05/1989 | CN2040532U Closed pneumatically lifted combination oil extraction device |
| 07/05/1989 | CN1033672A Beam-pumping unit with large amplitude for two oil wells |
| 07/05/1989 | CN1033671A Tackle pumping unit for two oil wells |
| 07/05/1989 | CN1004703B Oil repellent system with surfactant |
| 07/04/1989 | US4844797 Vacuum extraction system |
| 07/04/1989 | US4844511 Tubular connector |
| 07/04/1989 | US4844170 Well perforating gun and method |
| 07/04/1989 | US4844169 Nitrogen stimulation of a potassium hydroxide wellbore treatment |
| 07/04/1989 | US4844167 Through-tubing perforating apparatus |
| 07/04/1989 | US4844166 Method and apparatus for recompleting wells with coil tubing |
| 07/04/1989 | US4844163 Closing pores; enhanced oil recovery |
| 07/04/1989 | US4844162 Apparatus and method for treating geothermal steam which contains hydrogen sulfide |
| 07/04/1989 | US4844158 Solvent stimulation of viscous oil via a horizontal wellbore |
| 07/04/1989 | US4844156 Method of secondary extraction of oil from a well |
| 07/04/1989 | US4844155 Process for increasing the yield of oil reservoirs |
| 07/04/1989 | CA1256792A1 Multi-well hydrocarbon development system |
| 06/28/1989 | CN2040141U Soft-piston long-stroke deep-well pump with short length glass bushing |
| 06/27/1989 | US4842776 Styrylaryloxy ether sulfonates, a process for their preparation and their use in the recovery of crude oil |
| 06/27/1989 | US4842075 Subsea flowline connection system |
| 06/27/1989 | US4842071 Injection of aqueous dispersion of acrylamide polymers; then in situ hydrolysis with alkali metal base; enhanced oil recovery |
| 06/27/1989 | US4842070 Procedure for improving reservoir sweep efficiency using paraffinic or asphaltic hydrocarbons |
| 06/27/1989 | US4842069 Apparatus and method for cementing a liner in a well bore |
| 06/27/1989 | US4842068 Process for selectively treating a subterranean formation using coiled tubing without affecting or being affected by the two adjacent zones |
| 06/27/1989 | US4842065 Oil recovery process employing cyclic wettability alteration |
| 06/27/1989 | US4842064 Well testing apparatus and methods |
| 06/27/1989 | US4842057 Retrievable gravel packer and retrieving tool |
| 06/27/1989 | US4842056 Injecting aqueous solution of metal compound and reducing agent; corrosion resistance |
| 06/27/1989 | CA1256604A1 Process for clarifying bicarbonate bearing waters using measurement and control of carbon dioxide content |
| 06/27/1989 | CA1256365A1 Down hole soaper tool |
| 06/27/1989 | CA1256326A1 Unitized tlp anchor template with elevated well template |
| 06/27/1989 | CA1256305A1 Methods of pumping and loading emulsion slurry blasting compositions |
| 06/21/1989 | EP0321393A1 Optical brightener dispersion |
| 06/21/1989 | EP0321198A1 Radioactive shaped charges and method for well perforating |
| 06/21/1989 | EP0321197A1 Well logging using radioactive tracers |
| 06/21/1989 | CN2039739U Fault detecting and protecting device for pumping machine |
| 06/20/1989 | US4840292 Method and apparatus for dispensing oil well proppant additive |
| 06/20/1989 | US4840229 Multiple position service seal unit with positive position indicating means |
| 06/14/1989 | EP0320449A1 Steam mediated fluorochemically enhanced oil recovery |
| 06/14/1989 | EP0319942A2 Salts and amine of at least partially perfluorinated amino- and/or amidocarboxylic acids and their use |
| 06/14/1989 | CN2039347U Valve-type drop-proof operation casing |
| 06/14/1989 | CN2039346U Decompressor for tube-type oil pump |
| 06/14/1989 | CN2039345U Balance block regulator |
| 06/14/1989 | CN1033404A Gear type no playing beam oil extractor |
| 06/13/1989 | US4839154 Mixing a surfactant in the solution and reacting with oxidizing agent |
| 06/13/1989 | US4838733 Landfill compaction |
| 06/13/1989 | US4838353 System for completing and maintaining lateral wells |
| 06/13/1989 | US4838351 Proppant for use in viscous oil recovery |
| 06/13/1989 | US4838350 Gravity stable surfactant flooding in gas depleted reservoirs |
| 06/13/1989 | CA1255584A1 Packer and service tool assembly |
| 06/13/1989 | CA1255489A1 Process for the enhanced oil recovery of underground mineral oil deposits |
| 06/07/1989 | EP0319321A1 Firing head for a tubing-conveyed perforating gun and method of perforating |
| 06/06/1989 | US4836935 Oil removal from waterflooding injection water |
| 06/06/1989 | US4836299 Sonic method and apparatus for installing monitor wells for the surveillance and control of earth contamination |
| 06/06/1989 | US4836287 Safety gate valve for petroleum wells, permitting operation by artificial flow |
| 06/06/1989 | US4836286 Method for removal of flow-restricting matter from hydrocarbon producing wells |
| 06/06/1989 | US4836284 Equilibrium fracture acidizing |
| 06/06/1989 | US4836280 Method of evaluating subsurface fracturing operations |