| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 06/10/2004 | US20040108116 Valves for use in wells |
| 06/10/2004 | US20040108109 Drop ball catcher apparatus |
| 06/10/2004 | US20040108107 Controlled-pressure drop liner |
| 06/10/2004 | US20040107991 Bop operating system with quick dump valve |
| 06/08/2004 | US6745844 Hydraulic power source for downhole instruments and actuators |
| 06/08/2004 | US6745843 Base-pipe flow control mechanism |
| 06/08/2004 | US6745838 Chemical injection control system and method for multiple wells |
| 06/03/2004 | WO2004028656A9 System and method for material removal |
| 06/03/2004 | US20040104024 Flow completion apparatus |
| 06/03/2004 | DE69816743T2 Fiberoptische sensoren und ansteuervorrichtungen in bohrloechern Fiberoptic Sensors and Control devices in boreholes |
| 06/02/2004 | EP1423583A1 Adjustable well screen assembly |
| 06/01/2004 | US6742597 Safety check valve for coiled tubing |
| 06/01/2004 | US6742595 Subsurface safety valve lock out and communication tool and method for use of the same |
| 05/27/2004 | WO2003097988A3 Equalizer valve and method of use |
| 05/27/2004 | US20040099447 Downhole circulation valve operated by dropping balls |
| 05/27/2004 | US20040099419 Downhole safety valve for central circulation completion system |
| 05/27/2004 | US20040099418 Reservoir communication by creating a local underbalance and using treatment fluid |
| 05/26/2004 | EP1097289B1 Multi-line back pressure control system |
| 05/26/2004 | CN2617920Y Water injection flow controlling valves |
| 05/20/2004 | US20040094311 Well operations system |
| 05/20/2004 | US20040094304 Washpipeless isolation strings and methods for isolation with object holding service tool |
| 05/20/2004 | US20040094296 Well testing system |
| 05/19/2004 | EP1082517B1 Generating commands for a downhole tool |
| 05/19/2004 | CN2616678Y Tubular column bottom valve for well-killing free oil-production process |
| 05/19/2004 | CN2616677Y Jet-flow flushing device |
| 05/19/2004 | CN2616676Y Valve core closed square sucker rod down cock |
| 05/19/2004 | CN2616675Y Not-well-killing blowout-preventing oil drainage device |
| 05/19/2004 | CN2616674Y Gas-injection oil-production static well head valve |
| 05/19/2004 | CN2616665Y Drilling-insertion packer |
| 05/18/2004 | US6736213 Method and system for controlling a downhole flow control device using derived feedback control |
| 05/13/2004 | US20040089449 Controlling a pressure transient in a well |
| 05/12/2004 | EP1141514B1 Pipe assembly with a plurality of outlets for use in a wellbore and method for running such a pipe assembly |
| 05/12/2004 | CN2615332Y Fishing fixed valve in well |
| 05/12/2004 | CN2615331Y Antitheft single-flow valve |
| 05/12/2004 | CN2615330Y Thermal adoption three-way double-flow valve |
| 05/11/2004 | US6732806 One trip expansion method and apparatus for use in a wellbore |
| 05/11/2004 | US6732803 Debris free valve apparatus |
| 05/11/2004 | US6732798 Controlling transient underbalance in a wellbore |
| 05/06/2004 | WO2004020784A3 Throttle device |
| 05/06/2004 | US20040084190 Multi-cycle dump valve |
| 05/06/2004 | US20040084189 Instrumentation for a downhole deployment valve |
| 05/06/2004 | EP1415104A1 Valve system and method |
| 05/05/2004 | CN2614261Y Valve replacing equipment for pressure pipe line |
| 05/04/2004 | US6729393 Zero drill completion and production system |
| 05/04/2004 | US6729392 Tubing hanger with ball valve in the annulus bore |
| 05/04/2004 | CA2297003C Flow measurement mandrel |
| 04/29/2004 | US20040079910 Gate valve with flow-through gate |
| 04/29/2004 | US20040079529 Apparatus and method for installation of subsea well completion systems |
| 04/29/2004 | US20040079524 Toroidal choke inductor for wireless communication and control |
| 04/28/2004 | EP1412612A1 Downhole actuation system utilizing electroactive fluids |
| 04/28/2004 | EP0988439B1 Casing annulus remediation system |
| 04/27/2004 | US6725937 Downhole apparatus |
| 04/27/2004 | US6725936 Method for drilling a plurality of offshore underwater wells |
| 04/27/2004 | US6725935 PDF valve |
| 04/27/2004 | US6725934 Expandable packer isolation system |
| 04/27/2004 | US6725929 Circulation tool for use in gravel packing of wellbores |
| 04/27/2004 | CA2054919C Drill string component |
| 04/22/2004 | WO2004033849A1 Hydraulic stepping valve actuated sliding sleeve |
| 04/22/2004 | WO2003097988A9 Equalizer valve and method of use |
| 04/22/2004 | US20040074640 Method and apparatus |
| 04/22/2004 | US20040074636 Flow completion system |
| 04/22/2004 | US20040074635 Central circulation completion system |
| 04/21/2004 | EP1409908A1 Control cable |
| 04/21/2004 | EP1105620B1 Hydraulic well control system |
| 04/21/2004 | CN2612797Y Pressure transposition annular pressure control spherical test switch valve |
| 04/21/2004 | CN2612796Y Check valve at the bottom of waterflooding pipe string |
| 04/21/2004 | CN2612795Y Angular type check valve |
| 04/20/2004 | US6722440 Multi-zone completion strings and methods for multi-zone completions |
| 04/20/2004 | US6722439 Multi-positioned sliding sleeve valve |
| 04/20/2004 | US6722438 Method and apparatus for formation damage removal |
| 04/20/2004 | US6722425 Tubular filling system |
| 04/20/2004 | CA2199301C Dual bore annulus access valve |
| 04/15/2004 | WO2004031535A1 Lock open tool for downhole safety valve |
| 04/15/2004 | WO2004031534A1 Flapper valve closure mechanism |
| 04/15/2004 | WO2004031533A2 Downhole ball dropping apparatus |
| 04/15/2004 | WO2003093633A3 Subsurface valve with system and method for sealing |
| 04/15/2004 | US20040069533 Pneumatic rock-boring device and method for starting such a device |
| 04/15/2004 | US20040069491 Hydraulic stepping valve actuated sliding sleeve |
| 04/15/2004 | US20040069489 Gravel pack crossover tool with check valve in the evacuation port |
| 04/14/2004 | EP1407806A1 Screen with controlled pressure drop |
| 04/14/2004 | CN2611585Y Anti-pollution check valve for offshore oil field |
| 04/13/2004 | US6719059 Plug installation system for deep water subsea wells |
| 04/13/2004 | US6719057 Downhole subsurface safety valve device |
| 04/13/2004 | US6719051 Sand control screen assembly and treatment method using the same |
| 04/13/2004 | CA2329317C Improved surface controlled subsurface safety valve downstop seal |
| 04/08/2004 | WO2004029408A1 Safety valve with releasable flow tube for flapper lockout |
| 04/08/2004 | WO2004028656A2 System and method for material removal |
| 04/08/2004 | WO2004013457A3 Electric power control for sickline operations in wellbores |
| 04/08/2004 | WO2004011770A3 Apparatus for releasing a ball into a wellbore |
| 04/08/2004 | WO2004003336B1 A valve for a fill up tool |
| 04/08/2004 | US20040065442 Lock open and control system access apparatus for a downhole safety valve |
| 04/07/2004 | CN2610077Y Rod-pumped well tubing discharge apparatus |
| 04/06/2004 | US6715558 Infinitely variable control valve apparatus and method |
| 04/06/2004 | US6715557 Tool string |
| 04/06/2004 | US6715550 Controllable gas-lift well and valve |
| 04/06/2004 | US6715542 Tubular filling system |
| 04/06/2004 | US6715541 Ball dropping assembly |
| 04/01/2004 | WO2004027198A2 Remote intervention logic valving method and apparatus |
| 04/01/2004 | US20040060740 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium |
| 04/01/2004 | US20040060705 Method and apparatus for increasing fluid recovery from a subterranean formation |