| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 07/16/2002 | US6419010 Deviated borehole drilling assembly |
| 07/16/2002 | CA2179601C Horizontal tree safety valve |
| 07/10/2002 | CN2499570Y Double cavity type anti-block downhole chemical blending valve |
| 07/10/2002 | CN2499569Y Oil drain normal flushing valve for pump well |
| 07/09/2002 | US6415862 Tubular filling system |
| 07/09/2002 | CA2194105C Control system with collection chamber |
| 07/04/2002 | WO2002052124A2 Method and apparatus for repair operations downhole |
| 07/04/2002 | WO2002031311A3 Gas operated pump for use in a wellbore |
| 07/04/2002 | WO2002031310A3 Apparatus and method for controlling a fluid flow in a wellbore |
| 07/04/2002 | US20020084076 Equalizing flapper for down hole safety valves |
| 07/04/2002 | US20020084075 Downhole subsurface safety valve device |
| 07/03/2002 | EP0943050B1 Blowout preventer control system |
| 07/02/2002 | US6414905 Method and apparatus for communicating coded messages in a wellbore |
| 07/02/2002 | US6412555 System and method for controlling fluid flow in one or more oil and/or gas wells |
| 07/02/2002 | US6412510 Wellhead safety valve control system |
| 07/02/2002 | CA2211884C Subsurface safety valve actuation pressure amplifier |
| 06/27/2002 | US20020079104 Debris free valve apparatus |
| 06/27/2002 | US20020079103 Downhole control tool |
| 06/25/2002 | US6409219 Downhole screen with tubular bypass |
| 06/25/2002 | US6408945 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 06/20/2002 | US20020074129 Downhole tool utilizing opposed pistons |
| 06/20/2002 | US20020074128 Method and apparatus for surge reduction |
| 06/19/2002 | EP1214498A1 Downhole safety valve |
| 06/19/2002 | EP1214496A1 Electrical surface activated downhole circulating sub |
| 06/19/2002 | CN2495805Y Well head single flow combination device |
| 06/19/2002 | CN2495804Y Multi-functional and combination type wellhead device |
| 06/18/2002 | US6405803 Differential flow control valve |
| 06/13/2002 | WO2002046576A1 A sleeve valve for controlling fluid flow between a hydrocarbon reservoir and tubing in a well and method for the assembly of a sleeve valve |
| 06/13/2002 | WO2002046575A1 Device for an opening in an outer sleeve of a sleeve valve and a method for the assembly of a sleeve valve |
| 06/13/2002 | US20020070028 Debris free valve apparatus |
| 06/13/2002 | US20020070027 Method and apparatus for controlling well pressure in open-ended casing |
| 06/13/2002 | US20020070026 Light-intervention subsea tree system |
| 06/13/2002 | US20020070025 Multiple bore christmas tree outlet |
| 06/13/2002 | US20020070023 Multi-zone completion strings and methods for multi-zone completions |
| 06/13/2002 | US20020070014 Rotating blowout preventer with independent cooling circuits and thrust bearing |
| 06/13/2002 | DE10146025A1 Pneumatische Felsbohrvorrichtung Pneumatic Felsbohrvorrichtung |
| 06/12/2002 | EP1212515A2 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 06/11/2002 | US6401826 Lubricator for underbalanced drilling |
| 06/11/2002 | US6401824 Well completion convertible float shoe/collar |
| 06/11/2002 | US6401822 Float valve assembly for downhole tubulars |
| 06/11/2002 | US6401813 Wellhead cleanup tool |
| 06/06/2002 | WO2002044511A1 Pneumatic rock-boring device and method for starting such a device |
| 06/06/2002 | WO2002044508A2 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium |
| 06/06/2002 | US20020066574 Downhole multiplexer and related methods |
| 06/06/2002 | US20020066573 Formation isolation valve |
| 06/06/2002 | US20020066572 Pump systems and methods |
| 06/06/2002 | US20020066561 Controlling Production |
| 06/06/2002 | US20020066559 Bore Selector |
| 06/06/2002 | US20020066558 Tubular filling system |
| 06/06/2002 | US20020066309 Monitoring of downhole parameters and tools utilizing fiber optics |
| 06/04/2002 | US6397949 Method and apparatus for production using a pressure actuated circulating valve |
| 05/30/2002 | WO2002008561A3 Improvements in valves |
| 05/30/2002 | US20020062963 Flow-operated valve |
| 05/29/2002 | EP1208284A1 Sliding sleeve assembly for subsurface flow control |
| 05/29/2002 | CN2493739Y Gas recovery valve for oil well sleeve |
| 05/28/2002 | US6394187 Flapper valve assembly apparatus and method |
| 05/23/2002 | WO2002040823A1 Adjustable stabiliser for directional drilling |
| 05/23/2002 | WO2002021072A3 Displacement measurement with a spring and force measurement for actuators, blow-out preventers, valves |
| 05/23/2002 | US20020060096 Apparatus to actuate downhole tool |
| 05/21/2002 | US6390200 Drop ball sub and system of use |
| 05/21/2002 | US6390199 Downhole safety valve |
| 05/21/2002 | US6390190 Tubular filling system |
| 05/16/2002 | WO2002038912A1 Recovery of production fluids from an oil or gas well |
| 05/16/2002 | WO2002014650A8 Activating ball assembly for use with a by-pass tool in a drill string |
| 05/16/2002 | WO2001094743A3 Port collar assembly for use in a wellbore |
| 05/15/2002 | EP1205629A2 Method and device for securing an oil well in the event of a defect in the hydraulic control line of its downhole safety valve |
| 05/15/2002 | EP0988484A4 Water well recharge throttle valve |
| 05/15/2002 | CN2491598Y Salvagable oil-wall pump fixed valve assembly |
| 05/15/2002 | CN1349586A Downhole device for controlling fluid flow in a well |
| 05/14/2002 | US6388577 High impact communication and control system |
| 05/14/2002 | US6386291 Subsea wellhead system and method for drilling shallow water flow formations |
| 05/14/2002 | US6386289 Reclosable circulating valve for well completion systems |
| 05/14/2002 | US6386287 Deviated borehole drilling assembly |
| 05/10/2002 | WO2002036936A1 Flow controller with downhole pumping system |
| 05/09/2002 | US20020053438 Hydraulic control system for downhole tools |
| 05/09/2002 | US20020053427 Tubular filling system |
| 05/09/2002 | US20020053426 Method and apparatus for increasing fluid recovery from a subterranean formation |
| 05/08/2002 | DE10054217A1 Procedure for drive of thrust body by bi-directional linear magnet drive, has actuators with coils and yoke , working together with armature ring acting upon thrust body in alternating fashion |
| 05/07/2002 | US6384738 Pressure impulse telemetry apparatus and method |
| 05/07/2002 | US6382244 Reciprocating pump standing head valve |
| 05/07/2002 | US6382234 One shot valve for operating down-hole well working and sub-sea devices and tools |
| 05/02/2002 | US20020050930 Apparatus and method for downhole well equipment and process management, identification, and operation |
| 05/02/2002 | US20020050354 Low power miniature hydraulic actuator |
| 05/02/2002 | EP0960263B1 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 05/01/2002 | CN2489090Y Christmus tree for oil-field oil well |
| 04/30/2002 | US6378613 Large bore subsea Christmas tree and tubing hanger system |
| 04/30/2002 | US6378612 Pressure actuated downhole tool |
| 04/25/2002 | WO2002033215A2 Dual valve well control in underbalanced wells |
| 04/25/2002 | WO2002033214A1 Annular flow safety valve and method |
| 04/25/2002 | US20020046845 Hydraulic actuator |
| 04/25/2002 | US20020046843 Hydraulic actuator |
| 04/25/2002 | US20020046842 Ball valve seat and support |
| 04/25/2002 | US20020046834 Hydraulic actuator |
| 04/18/2002 | WO2002031315A1 Expandable lockout for a subsurface safety valve |
| 04/18/2002 | WO2002031311A2 Gas operated pump for use in a wellbore |
| 04/18/2002 | WO2002031310A2 Apparatus and method for controlling a fluid flow in a wellbore |
| 04/18/2002 | US20020043369 Petroleum well having downhole sensors, communication and power |
| 04/16/2002 | US6371210 Flow control apparatus for use in a wellbore |
| 04/16/2002 | US6371208 Variable downhole choke |
| 04/11/2002 | WO2002029205A1 Hydraulic control system for downhole tools |