| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 03/29/2000 | EP0989283A2 Wellhead |
| 03/29/2000 | EP0988484A1 Water well recharge throttle valve |
| 03/29/2000 | EP0988439A1 Casing annulus remediation system |
| 03/29/2000 | CN2371333Y Autocontrolled valve joint for drilling well |
| 03/28/2000 | US6041865 Method and apparatus for moving a diverter |
| 03/28/2000 | US6041864 Well isolation system |
| 03/28/2000 | US6041857 Motor drive actuator for downhole flow control devices |
| 03/28/2000 | US6041804 Subsea valve actuator and method |
| 03/23/2000 | WO2000015945A1 Method and apparatus for downhole safety valve remediation |
| 03/23/2000 | WO2000015943A1 Improved ball valve |
| 03/22/2000 | EP0987400A1 Method and apparatus for remote control of multilateral wells |
| 03/21/2000 | US6039119 Completion system |
| 03/16/2000 | WO2000014383A1 In situ borehole sample analyzing probe and valved casing coupler therefor |
| 03/15/2000 | EP0985799A2 Underbalanced well completion |
| 03/15/2000 | EP0985798A2 Apparatus for opening and closing a flapper valve |
| 03/15/2000 | EP0985797A2 Underbalanced well completion |
| 03/14/2000 | US6036860 Method and apparatus for the separation of hazardous waste from groundwater |
| 03/14/2000 | US6035880 Pressure activated switch valve |
| 03/09/2000 | WO1999063234A3 A device and method for regulating fluid flow in a well |
| 03/07/2000 | US6033152 Pile forming apparatus |
| 03/07/2000 | US6032743 Method and apparatus for reducing gas well production costs using improved downhole valves |
| 03/07/2000 | US6032742 Blowout preventer control system |
| 03/07/2000 | US6032735 Gravel pack apparatus |
| 03/02/2000 | WO2000011312A1 Grouting pipe equipment and method of grouting using the same for an underground water well |
| 03/01/2000 | EP0786044B1 Subsurface safety valve of minimized length |
| 02/24/2000 | WO2000009855A1 Hydraulic well control system |
| 02/22/2000 | US6026905 Subsea test tree and methods of servicing a subterranean well |
| 02/22/2000 | US6026903 Bidirectional disappearing plug |
| 02/17/2000 | WO2000008299A1 Axial pressure equalizing valve for a well safety valve |
| 02/16/2000 | EP0979925A1 Subsea wellhead assembly |
| 02/16/2000 | EP0979345A2 Oil separation and pumping systems |
| 02/16/2000 | EP0736129B1 Horizontal tree safety valve |
| 02/16/2000 | CN2364205Y Inclined edge shearing type oil drain device |
| 02/15/2000 | US6024173 Inflatable shifting tool |
| 02/09/2000 | EP0978629A2 Method of completing a well |
| 02/03/2000 | WO1999058809A3 Coupling with shape-memory material, disconnecting tool with a piston and coupling with valves |
| 02/02/2000 | EP0975992A1 Pressure impulse telemetry apparatus and method |
| 02/01/2000 | US6021095 Method and apparatus for remote control of wellbore end devices |
| 01/27/2000 | WO2000004274A1 Downhole multiplexer and related methods |
| 01/27/2000 | WO2000004273A1 Multi-line back pressure control system |
| 01/26/2000 | EP0974729A1 A screw drilling device |
| 01/26/2000 | EP0974066A1 High impact communication and control system |
| 01/26/2000 | CN2360596Y Oil extracting tube type discharge appts |
| 01/25/2000 | USRE36525 Spoolable flexible hydraulically set, straight pull release well packer |
| 01/20/2000 | WO1997037102A3 Downhole flow control devices |
| 01/19/2000 | CN2359458Y Sliding-casing type oil discharging apparatus |
| 01/18/2000 | US6015014 Downhole lubricator and method |
| 01/12/2000 | CN2358222Y Sampling multipurpose valve in well head |
| 01/06/2000 | WO2000000716A2 System and method for controlling fluid flows in oil or gas wells |
| 01/06/2000 | WO2000000655A1 Cemented carbide for oil and gas applications |
| 01/06/2000 | CA2334965A1 System and method for controlling fluid flows in oil or gas wells |
| 01/05/2000 | EP0969183A2 Plug |
| 01/05/2000 | EP0839255A4 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing |
| 01/04/2000 | US6009950 Subsea manifold stab with integral check valve |
| 01/04/2000 | US6009945 Oil well tool |
| 12/29/1999 | WO1999067500A1 Gate valve for subsea completion system |
| 12/28/1999 | US6006838 Apparatus and method for stimulating multiple production zones in a wellbore |
| 12/28/1999 | US6006828 Apparatus for the remote deployment of valves |
| 12/22/1999 | CN2355100Y Flow control valve for hydraulic oil suction |
| 12/22/1999 | CN2355099Y Short joint for pressure reduction of operating cylinders of hydraulic pumps |
| 12/21/1999 | US6003834 Fluid circulation apparatus |
| 12/21/1999 | US6003605 Balanced line tubing retrievable safety valve |
| 12/15/1999 | CN2353883Y Downhole automatic gas distribution valve |
| 12/14/1999 | US6000468 Method and apparatus for the downhole metering and control of fluids produced from wells |
| 12/14/1999 | CA2171854C Apparatus and method for temporarily plugging a tubular |
| 12/14/1999 | CA2111734C Controlling multiple tool positions with a single repeated remote command signal |
| 12/09/1999 | WO1999063234A2 A device and method for regulating fluid flow in a well |
| 12/09/1999 | WO1999063198A1 Mechanical shut-off valve |
| 12/08/1999 | EP0962624A1 Device for making or regenerating water wells |
| 12/08/1999 | EP0962623A2 Well completion tool with fluid passages |
| 12/08/1999 | EP0962622A2 Electrohydraulic control unit |
| 12/08/1999 | CN2352671Y Rotating type oil draining arrangement |
| 12/07/1999 | US5996696 Method and apparatus for testing the integrity of oil delivery tubing within an oil well casing |
| 12/07/1999 | US5996687 Full bore variable flow control device |
| 12/07/1999 | CA2127476C Logging or measurement while tripping |
| 12/02/1999 | WO1999061746A1 Generating commands for a downhole tool |
| 12/01/1999 | EP0961008A2 Apparatus and method for drilling and completing a deviated borehole |
| 12/01/1999 | EP0960263A2 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 12/01/1999 | EP0960261A1 Tool and method for drilling a lateral well |
| 12/01/1999 | CN2351546Y Casing associated gas well recovering apparatus |
| 11/30/1999 | US5992527 Wellhead assembly |
| 11/30/1999 | US5992524 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access |
| 11/30/1999 | US5992520 Annulus pressure operated downhole choke and associated methods |
| 11/28/1999 | CA2272679A1 Bore hole safety valves |
| 11/25/1999 | WO1999060247A1 Automatic hydrocarbon production management system |
| 11/23/1999 | US5988285 Zone isolation system |
| 11/23/1999 | US5988282 Pressure compensated actuated check valve |
| 11/18/1999 | WO1999058814A1 Downhole dump valve |
| 11/18/1999 | WO1999058809A2 Coupling with shape-memory material, disconnecting tool with a piston and coupling with valves |
| 11/16/1999 | US5984014 Pressure responsive well tool with intermediate stage pressure position |
| 11/11/1999 | WO1999057417A2 Chemical actuation system for downhole tools and method for detecting failure of an inflatable element |
| 11/10/1999 | CN2348094Y Downhole sliding sleeve switch device |
| 11/09/1999 | US5979561 Downhole activation circuit valving |
| 11/09/1999 | US5979558 Variable choke for use in a subterranean well |
| 11/04/1999 | WO1999056045A1 Differential relief valve for flexible sea line |
| 11/03/1999 | EP0953097A1 Pressure equalizing safety valve for subterranean wells |
| 11/03/1999 | CN2346928Y Wellhead sluice valve |
| 11/03/1999 | CN2346927Y Producing well technical combined valve |
| 11/03/1999 | CN2346925Y Fully enclosed anti-theft light weight eccentric christmas tree wellhead assembly |
| 11/02/1999 | US5975212 Surface controlled subsurface safety valve downstop seal |