| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 09/04/2001 | US6283477 Annular chamber seal |
| 09/04/2001 | US6283217 Axial equalizing valve |
| 09/04/2001 | US6283208 Orienting tool and method |
| 08/30/2001 | WO2001063089A1 Sequential hydraulic control system for use in subterranean well |
| 08/30/2001 | WO2001012949A3 Downhole flapper valve assembly |
| 08/30/2001 | US20010017210 Liner setting tool |
| 08/30/2001 | US20010017157 Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 08/30/2001 | EP1144803A3 Downhole flapper valve assembly |
| 08/29/2001 | EP1127212A1 Hydraulic switch device |
| 08/28/2001 | CA2093331C Valve control apparatus |
| 08/23/2001 | WO2001061148A2 Filter cake cleanup and gravel pack methods for oil based or water based drilling fluids |
| 08/23/2001 | WO2001061147A1 Circulation tool for use in gravel packing of wellbores |
| 08/23/2001 | WO2001061144A1 Digital hydraulic well control system |
| 08/23/2001 | US20010015277 Packer |
| 08/23/2001 | US20010015276 Wellbore flow control device |
| 08/22/2001 | EP0851965B1 Simplified xmas tree using sub-sea test tree |
| 08/22/2001 | CN1309743A Device and method for regulating fluid flow in well |
| 08/21/2001 | US6276458 Apparatus and method for controlling fluid flow |
| 08/21/2001 | US6276386 Charging device for hydraulic systems |
| 08/16/2001 | WO2001059258A1 A method and apparatus for the optimal predistortion of an electromagnetic signal in a downhole communication system |
| 08/16/2001 | US20010013412 Production well telemetry system and method |
| 08/16/2001 | US20010013411 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 08/16/2001 | US20010013410 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 08/15/2001 | CN2443144Y Cap shaped valve |
| 08/14/2001 | US6273195 Downhole flow and pressure control valve for wells |
| 08/14/2001 | US6273194 Method and device for downhole flow rate control |
| 08/14/2001 | US6273187 Method and apparatus for downhole safety valve remediation |
| 08/09/2001 | WO2001057395A1 Controlling activation of devices |
| 08/09/2001 | WO2001057358A1 Method and operating devices having expandable element actuators |
| 08/09/2001 | US20010011593 Well completion system with an annular bypass and a solid stopper means |
| 08/09/2001 | US20010011592 Preloading type connector |
| 08/09/2001 | US20010011589 Tubular filling system |
| 08/09/2001 | CA2397819A1 Method and operating devices having expandable element actuators |
| 08/07/2001 | US6269883 Disconnect tool |
| 08/07/2001 | US6269874 Electro-hydraulic surface controlled subsurface safety valve actuator |
| 08/02/2001 | WO2001055555A1 Choke inductor for wireless communication and control in a well |
| 08/02/2001 | WO2001055554A1 Downhole wireless two-way telemetry system |
| 08/02/2001 | WO2001055553A1 System and method for fluid flow optimization in a gas-lift oil well |
| 08/02/2001 | WO2001055550A1 Crossover tree system |
| 08/02/2001 | WO2001055549A1 Tubing hanger shuttle valve |
| 08/02/2001 | WO2001018357A3 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 08/02/2001 | WO2000047864A9 Subsea completion apparatus |
| 08/01/2001 | EP0698175A4 Well plugging apparatus and method |
| 08/01/2001 | CN1306148A Multifunctional stratum protecting valve |
| 07/31/2001 | US6268911 Monitoring of downhole parameters and tools utilizing fiber optics |
| 07/26/2001 | WO2001053654A1 Seal protection apparatus |
| 07/24/2001 | US6263982 Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling |
| 07/24/2001 | US6263910 Valve with secondary load bearing surface |
| 07/17/2001 | US6260850 Annular chamber seal |
| 07/17/2001 | US6260616 Downhole flow control devices |
| 07/12/2001 | WO2001049969A1 Flow control in a wellbore |
| 07/12/2001 | US20010007284 Downhole apparatus |
| 07/11/2001 | CA2328666A1 Wellhead assembly |
| 07/11/2001 | CA2306289A1 A tubing plug |
| 07/05/2001 | WO2001048352A1 A system for intervention of subsea wells |
| 07/04/2001 | EP1112438A1 $i(IN SITU) BOREHOLE SAMPLE ANALYZING PROBE AND VALVED CASING COUPLER THEREFOR |
| 07/04/2001 | EP1112436A1 Improved ball valve |
| 07/04/2001 | EP0865564B1 Down hole bypass valve |
| 07/04/2001 | CN2437849Y Theftproof sampling valve for oil well |
| 07/04/2001 | CN2437848Y Oil flow adjuster |
| 07/03/2001 | US6253861 Circulation tool |
| 07/03/2001 | US6253856 Pack-off system |
| 07/03/2001 | US6253854 Emergency well kill method |
| 07/03/2001 | US6253853 Fluid injection tubing assembly and method |
| 07/03/2001 | US6253843 Electric safety valve actuator |
| 07/03/2001 | US6253842 Wireless coiled tubing joint locator |
| 06/27/2001 | EP0828922B1 Actuating ball |
| 06/27/2001 | CN2436646Y Bidirectional stabilizing check valve |
| 06/26/2001 | US6250392 Pump systems and methods |
| 06/26/2001 | US6250383 Lubricator for underbalanced drilling |
| 06/21/2001 | WO2001044619A1 Controlling fluid flow in conduits |
| 06/20/2001 | CN1300340A Downhole dump valve |
| 06/19/2001 | US6247536 Downhole multiplexer and related methods |
| 06/14/2001 | WO2001042695A1 A ball valve device |
| 06/14/2001 | WO2001042620A1 Sand control method and apparatus |
| 06/14/2001 | US20010003288 Valve arrangement for controlling hydraulic fluid flow to a subsea system |
| 06/13/2001 | EP1105621A2 System and method for controlling fluid flow in one or more oil and/or gas wells |
| 06/13/2001 | EP1105620A1 Hydraulic well control system |
| 06/12/2001 | US6244348 Well production system with a hydraulically operated safety valve |
| 06/07/2001 | WO2001040624A2 Production valve |
| 06/07/2001 | WO2001040614A2 Ceramic components for high pressure oil wells |
| 06/07/2001 | US20010002621 Packer |
| 06/07/2001 | CA2396420A1 Ceramic components for high pressure oil wells |
| 06/06/2001 | EP0888490B1 Mill for wellbore milling operations |
| 06/05/2001 | US6241032 One-way drill string clutch |
| 06/05/2001 | US6241015 Apparatus for remote control of wellbore fluid flow |
| 05/30/2001 | CN2432334Y Improved casing back pressure valve |
| 05/29/2001 | US6237693 Failsafe safety valve and method |
| 05/29/2001 | US6237691 Method and apparatus for increasing fluid recovery from a subterranean formation |
| 05/29/2001 | US6237683 Wellbore flow control device |
| 05/25/2001 | WO2001036787A1 Downhole valve |
| 05/25/2001 | WO2001036786A1 Wellbore system having non-return valve |
| 05/25/2001 | CA2389621A1 Downhole valve |
| 05/24/2001 | US20010001429 Underbalanced well completion |
| 05/23/2001 | CN2431397Y Hydraulic combined valve |
| 05/22/2001 | US6234247 Bore hole safety valves |
| 05/17/2001 | WO2001034938A1 Hydraulically set straddle packers |
| 05/16/2001 | EP1099001A1 Cemented carbide for oil and gas applications |
| 05/15/2001 | US6231312 Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 05/15/2001 | US6231265 Self-aligning subsea latch mechanism |