| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 02/24/2005 | US20050039914 Hydraulically actuated control system for use in a subterranean well |
| 02/24/2005 | US20050039907 Aquifer recharge valve and method |
| 02/23/2005 | EP1282757A4 Subsea riser disconnect and method |
| 02/23/2005 | CN2680848Y Natural gas production well mouth device capable of replacing parts without killing well |
| 02/23/2005 | CN1584283A Safety cut-off flat plate valve of well mouth |
| 02/22/2005 | US6857477 Method for using a reciprocating pump vent-dump valve |
| 02/22/2005 | CA2270851C Electro-hydraulic surface controlled subsurface safety valve actuator |
| 02/22/2005 | CA2167491C Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing |
| 02/17/2005 | WO2005014973A2 Drive device for an actuating member |
| 02/17/2005 | US20050034875 Valves for Use in Wells |
| 02/17/2005 | US20050034854 Underbalanced well completion |
| 02/16/2005 | EP1234100B1 Production valve |
| 02/16/2005 | CN2679356Y Downhole omnidirectional flow controller for chemical injection |
| 02/16/2005 | CN2679355Y Well casing gas reclaimer |
| 02/16/2005 | CN2679354Y Safety valve in completion system of oil field |
| 02/15/2005 | US6854534 Two string drilling system using coil tubing |
| 02/15/2005 | US6854519 Subsurface valve with system and method for sealing |
| 02/15/2005 | CA2184023C Check valve and check valve seat |
| 02/10/2005 | US20050028984 Recovery of production fluids from an oil or gas well |
| 02/09/2005 | CN2677605Y Anti-theft high-pressure valve with cipher |
| 02/09/2005 | CN2677604Y Anti-theft compound multifunction producing well head device |
| 02/09/2005 | CN2677603Y Oil well head associated gas recovering valve |
| 02/09/2005 | CN2677598Y 强磁保护器 Magnetic protection |
| 02/08/2005 | US6851481 Electro-hydraulically pressurized downhole valve actuator and method of use |
| 02/08/2005 | US6851477 Curved flapper with angle variant seat for a subsurface safety valve |
| 02/08/2005 | CA2364329C Equalizing flapper for downhole safety valves |
| 02/08/2005 | CA2363708C Debris free valve apparatus |
| 02/08/2005 | CA2244942C Electric safety valve actuator |
| 02/02/2005 | CN2675856Y Degassing and recovering apparatus for oil well casing |
| 02/02/2005 | CN2675854Y Bidirectional oil layer protector |
| 02/01/2005 | US6848509 Pressure equalizing plunger valve for downhole use |
| 02/01/2005 | CA2325761C Downhole screen with tubular bypass |
| 01/27/2005 | WO2005008024A1 Cement control ring in a flapper valve |
| 01/27/2005 | WO2004028656A3 System and method for material removal |
| 01/27/2005 | US20050016734 Cement control ring |
| 01/26/2005 | CN2674082Y Settled sand bottom ball |
| 01/26/2005 | CN2674081Y Sand controlled well flushing valve |
| 01/20/2005 | WO2005005778A1 Downhole Data Communication |
| 01/20/2005 | WO2004094775A3 Screen for blanking plug |
| 01/20/2005 | CA2755402A1 Downhole data communication |
| 01/19/2005 | CN2672285Y High pressure seal mud wafer valve |
| 01/13/2005 | US20050006150 Solids strainer system for a hydraulic choke |
| 01/13/2005 | US20050005966 Shut-off device |
| 01/12/2005 | EP1264076A4 Multi-purpose float equipment and method |
| 01/12/2005 | CN1564902A Adjustable well screen assembly |
| 01/11/2005 | US6840494 Gate valve with flow-through gate |
| 01/11/2005 | US6840323 Tubing annulus valve |
| 01/11/2005 | US6840317 Wireless downwhole measurement and control for optimizing gas lift well and field performance |
| 01/11/2005 | CA2218259C Motor drive actuator for downhole flow control devices |
| 01/06/2005 | WO2005001233A2 Improved horizontal tree assembly |
| 01/06/2005 | US20050000693 Release tool for coiled tubing |
| 01/04/2005 | CA2349816C Downhole well-control valve reservoir monitoring and drawdown optimization system |
| 01/04/2005 | CA2337030C Downhole multiplexer and related methods |
| 01/04/2005 | CA2206351C Downhole lubricator and method |
| 12/30/2004 | US20040263350 Permanent downhole, wireless, two-way telemetry backbone using redundant repeaters |
| 12/30/2004 | US20040262010 Horizontal tree assembly |
| 12/29/2004 | CN2667159Y Atitheft, antifreezing and antipollution oil sampling device |
| 12/28/2004 | US6834726 Method and apparatus to reduce downhole surge pressure using hydrostatic valve |
| 12/28/2004 | US6834722 Cyclic check valve for coiled tubing |
| 12/28/2004 | CA2234689C Mill for wellbore milling operations |
| 12/23/2004 | US20040256113 Methods and apparatus for actuating a downhole tool |
| 12/22/2004 | EP1276955B1 Central circulation completion system |
| 12/22/2004 | CN2665354Y Dual tubing heat extraction wellhead |
| 12/21/2004 | US6832656 Valve for an internal fill up tool and associated method |
| 12/21/2004 | US6832654 Bottom hole assembly |
| 12/18/2004 | CA2694851A1 Methods and apparatus for actuating a downhole tool |
| 12/16/2004 | US20040251036 Well operations system |
| 12/16/2004 | US20040251032 Apparatus and methods for utilizing a downhole deployment valve |
| 12/16/2004 | US20040251023 Downhole surge pressure reduction and filtering apparatus |
| 12/16/2004 | US20040251020 Adjustable well screen assembly |
| 12/16/2004 | DE10146025B4 Verfahren und System zum horizontalen Erdbohren sowie Schlagspitze und Verfahren zum Starten eines Schlagwerkzeugs Method and system for horizontal Erdbohren and striking tip and method for starting a striking tool |
| 12/15/2004 | EP1325210B1 Apparatus and method for controlling a fluid flow in a wellbore |
| 12/15/2004 | EP1274992A4 Apparatus and method for downhole well equipment and process management, identification, and actuation |
| 12/15/2004 | EP1127212B1 Hydraulic switch device |
| 12/15/2004 | EP1060320A4 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 12/14/2004 | US6830441 Valve for downhole pump |
| 12/14/2004 | CA2363974C Insert assembly for a wellhead choke valve |
| 12/14/2004 | CA2286889C Pressure-balanced rod piston control system for a subsurface safety val ve |
| 12/14/2004 | CA2205728C Inflatable packer with port collar valving |
| 12/09/2004 | WO2004106694A1 Pressure controlled downhole operations |
| 12/09/2004 | US20040245020 Apparatus and methods for drilling a wellbore using casing |
| 12/09/2004 | US20040244976 System and method for downhole operation using pressure activated valve and sliding sleeve |
| 12/08/2004 | EP1383985B1 Wellhead product testing system |
| 12/08/2004 | CN2661913Y Leak detector valve for casing |
| 12/08/2004 | CN2661912Y Composite type ceramic oil nozzle |
| 12/08/2004 | CN2661911Y Beam well oil tube preventer against oil leak and oil steal |
| 12/02/2004 | US20040238184 High impact communication and control system |
| 12/02/2004 | US20040238173 Method and apparatus for treating a subterranean formation |
| 12/02/2004 | US20040238168 Expandable sand control screen assembly having fluid flow control capabilities and method for use of same |
| 12/01/2004 | EP1112436B1 Improved ball valve |
| 12/01/2004 | CN2660111Y Down flushing anti-sand one-way fluid valve |
| 12/01/2004 | CN2660110Y Automatic choke exhauster |
| 12/01/2004 | CN2660109Y Casing gas constant pressure arrangement |
| 11/30/2004 | US6823941 Recovery of production fluids from an oil or gas well |
| 11/30/2004 | US6823936 Fluid flow control apparatus |
| 11/30/2004 | CA2282899C Adjustable orifice valve |
| 11/25/2004 | WO2004101950A1 Flow control device |
| 11/25/2004 | WO2004027198A3 Remote intervention logic valving method and apparatus |
| 11/25/2004 | US20040231853 Method and apparatus to selectively reduce wellbore pressure during pumping operations |
| 11/25/2004 | US20040231852 Method and apparatus to selectively reduce wellbore pressure during pumping operations |