| 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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| 04/07/1999 | CN2313039Y Eccentric water-distribution device |
| 04/07/1999 | CN1042848C Temporary plugging technique for injection distribution working construction of oil field |
| 04/06/1999 | US5892147 Method for the determination of inflow of oil and/or gas into a well |
| 04/06/1999 | US5891829 Process for the downhole upgrading of extra heavy crude oil |
| 04/06/1999 | US5890539 Tubing-conveyer multiple firing head system |
| 04/06/1999 | US5890536 Method for stimulation of lenticular natural gas formations |
| 04/06/1999 | US5890533 Alternate path well tool having an internal shunt tube |
| 04/06/1999 | US5890511 Underwater recovery of fluids from submerged tank |
| 04/01/1999 | WO1999015761A1 Hydrologic cells for recovery of hydrocarbons and/or thermal energy from hydrocarbon bearing formations |
| 04/01/1999 | WO1999015760A1 Production fluid control device for oil/gas wells |
| 04/01/1999 | WO1999015756A2 Multi-well computerized control of fluid pumping |
| 04/01/1999 | WO1999015755A2 Dual injection and lifting system |
| 04/01/1999 | WO1998023842A8 Methods and apparatus for enhanced recovery of viscous deposits by thermal stimulation |
| 04/01/1999 | CA2304775A1 Multi-well computerized control of fluid pumping |
| 03/31/1999 | CN2312324Y Device for monitoring parameters of fracking acidizing of oil well or gas well |
| 03/31/1999 | CN2312323Y Walking-beam balancing, diameter-adjusting and torque-changing energy saving oil pumping machine |
| 03/31/1999 | CN1212318A Hydrologic cells for recovery of hydrocarbons or of thermal energy from coal, oil-shale, tar-sands and oil-bearing formations |
| 03/31/1999 | CN1212317A Method and device for gas recovering and transporting fluid |
| 03/30/1999 | US5889217 Process and apparatus for obtaining samples of liquid and gas from soil |
| 03/30/1999 | US5888022 Method and system for treating bio-degradable waste material through aerobic degradation |
| 03/30/1999 | US5888021 Method and apparatus for remediation of contaminated soil |
| 03/30/1999 | US5887660 Liner packer assembly and method |
| 03/30/1999 | US5887657 Pressure test method for permanent downhole wells and apparatus therefore |
| 03/30/1999 | US5887654 Method for performing downhole functions |
| 03/25/1999 | WO1999014462A1 Riser installation method and riser system |
| 03/25/1999 | DE19842424A1 Increasing methane production from water-bearing subterranean coal or carbonaceous formation |
| 03/24/1999 | EP0903463A2 Formation fracturing and gravel packing tool |
| 03/24/1999 | EP0659207B1 Use of detergent mixtures |
| 03/24/1999 | CN2311604Y 加热式油水分离器 Heated water separator |
| 03/24/1999 | CN2311603Y Underwell waterflood quantity choking device |
| 03/24/1999 | CN2311602Y Efficient compound gas sand anchor |
| 03/23/1999 | US5885028 Floating systems and method for storing produced fluids recovered from oil and gas wells |
| 03/23/1999 | US5884702 Liner assembly and method |
| 03/23/1999 | CA2245410A1 Triple action pumping system |
| 03/23/1999 | CA2149591C Method and apparatus for downhole sand clean-out operations in the petroleum industry |
| 03/18/1999 | WO1999013195A1 Apparatus and method for installing a branch junction from a main well |
| 03/18/1999 | WO1999013024A1 Method for converting a heavy crude oil produced via a wellbore from a subterranean formation into a distillate product stream using a solvent deasphalting process |
| 03/18/1999 | WO1999012630A1 Well casing assembly with erosion protection for inner screen |
| 03/18/1999 | WO1998054441A3 Method and apparatus for multi-phase separation |
| 03/18/1999 | CA2301617A1 Well casing assembly with erosion protection for inner screen |
| 03/17/1999 | EP0901844A2 Method and device for treating an impure liquid |
| 03/17/1999 | CN2310859Y Oil rock pore path cleaning device for oil production well |
| 03/17/1999 | CN2310858Y Combined sand prevention means |
| 03/16/1999 | US5883053 Nitrogen/carbon dioxide combination fracture treatment |
| 03/16/1999 | US5881815 Drilling, production, test, and oil storage caisson |
| 03/16/1999 | US5881814 Apparatus and method for dual-zone well production |
| 03/16/1999 | US5881812 Filter for subterranean use |
| 03/16/1999 | US5881811 Modeling of interactions between wells based on produced watercut |
| 03/16/1999 | US5881809 Well casing assembly with erosion protection for inner screen |
| 03/16/1999 | CA2152383C Assembly and process for drilling and completing multiple wells |
| 03/11/1999 | WO1999011905A1 Use of static mixing elements in connection with flow of gas and liquids through a production tubing |
| 03/10/1999 | EP0900915A2 Methods of completing and producing a subterranean well and associated apparatus |
| 03/10/1999 | EP0900911A2 Methods of completing and producing a subterranean well and associated apparatus |
| 03/10/1999 | CN2310157Y Float bed type water tank oxygen-insulating device |
| 03/09/1999 | US5879108 Air sparging/soil vapor extraction apparatus |
| 03/09/1999 | US5878817 Apparatus and process for closed loop control of well plunger systems |
| 03/09/1999 | US5878815 Assembly and process for drilling and completing multiple wells |
| 03/09/1999 | CA2036734C Treating underground formations |
| 03/04/1999 | WO1999010945A1 Producing electrical energy from natural gas using a solid oxide fuel cell |
| 03/04/1999 | WO1999010623A1 Stimulation of lenticular natural gas formations |
| 03/04/1999 | WO1999010622A1 Installing a scrolled resilient sheet alongside the inner surface of a fluid conduit |
| 03/04/1999 | WO1999010070A1 Improved helical separator |
| 03/04/1999 | CA2300395A1 Stimulation of lenticular natural gas formations |
| 03/03/1999 | EP0899421A2 Method of suspending an electric submergible pump within a wellbore |
| 03/03/1999 | EP0899420A1 Method for installing a scrolled resilient sheet alongside the inner surface of a fluid conduit |
| 03/03/1999 | EP0899419A2 System and method for isolating a zone in a borehole |
| 03/03/1999 | EP0899418A1 Modifying subterranean strata |
| 03/03/1999 | CN2309419Y Double-jet perforator for oil-gas well |
| 03/03/1999 | CN1209860A Method and equipment for promoting flow of offshore products |
| 03/03/1999 | CN1209859A Method and equipment for petroleum products at sea, having primary gas-separation |
| 03/03/1999 | CN1209520A Apparatus and method for reducing oxygen-content in waste gas of boiler |
| 03/02/1999 | US5877361 Materials handling |
| 03/02/1999 | US5877126 Method of reducing formation damage when drilling for oil and gas |
| 03/02/1999 | US5875852 Apparatus and associated methods of producing a subterranean well |
| 03/02/1999 | US5875843 Method for vertically extending a well |
| 03/02/1999 | US5875841 Oil well blow-out preventer |
| 03/02/1999 | US5875840 Multiple test cased hole formation tester with in-line perforation, sampling and hole resealing means |
| 02/24/1999 | EP0897478A1 Bending rod connection |
| 02/24/1999 | EP0897456A2 Multi-lateral wellbore systems and methods for forming same |
| 02/24/1999 | EP0897455A1 Oil extracting installation incorporating manifold support mounting plates, plate and method of installation |
| 02/24/1999 | CN2308729Y Multi-cylinder hydraulic speed regulating and energy saving oil pumping machine |
| 02/24/1999 | CN2308728Y Power saving device for power supply line of oil pumping machine |
| 02/24/1999 | CN2308709Y Anti-theft and anti-frozen manhole of water flooding well |
| 02/24/1999 | CN2308708Y Sieving tube loaded fracturing pellet |
| 02/24/1999 | CN2308704Y Car carrying oil pumping unit |
| 02/24/1999 | CN1208808A Method and equipment for prodn. of thick oil by injecting detackifier |
| 02/24/1999 | CN1208807A Device for transferring fluid between equipment on seabed and surface unit |
| 02/24/1999 | CN1042254C Method for increasing oil prodn. and reducing precipitation of asphalt from crude oil in dill hole |
| 02/23/1999 | US5873416 In an offshore structure designed to drill for/produce hydrocarbons |
| 02/23/1999 | US5873411 Double acting reciprocating piston pump |
| 02/23/1999 | US5873410 Method and installation for pumping an oil-well effluent |
| 02/22/1999 | CA2213631A1 Method and apparatus for reducing gas well production costs using improved downhole valves |
| 02/18/1999 | WO1999007979A1 Down-hole, production pump and circulation system |
| 02/18/1999 | WO1999007975A1 Method and apparatus for drilling and completing wells |
| 02/18/1999 | CA2268256A1 Method and apparatus for drilling and completing wells |
| 02/18/1999 | CA2245205A1 Methods of modifying subterranean strata properties |
| 02/17/1999 | CN2307908Y Non-rustiness motor-pumped well filter |
| 02/17/1999 | CN1042163C Method for reducing petention of displacing agent and application to enhanced hydrocarbon recovery |
| 02/16/1999 | US5871340 Apparatus for cooling high-pressure boost high gas-fraction twin-screw pumps |
| 02/16/1999 | US5871053 Method for improving oil recovery from a formation using hydrocarbon analysis of the fluid produced therefrom |