| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 05/15/2001 | US6230811 Internal pressure operated circulating valve with annulus pressure operated safety mandrel |
| 05/15/2001 | US6230808 Downhole apparatus |
| 05/15/2001 | US6230807 Valve operating mechanism |
| 05/10/2001 | WO2001033045A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/10/2001 | WO2001033044A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/10/2001 | CA2376544A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/09/2001 | EP1097289A1 Multi-line back pressure control system |
| 05/09/2001 | EP1019611A4 Bypass valve for downhole motor |
| 05/09/2001 | CN2429626Y Self filling valve for well cementing |
| 05/09/2001 | CN2429625Y Pressure control valve |
| 05/08/2001 | US6227302 Apparatus and method for controlling fluid flow in a wellbore |
| 05/08/2001 | US6227301 Christmas tree |
| 05/08/2001 | US6227299 Flapper valve with biasing flapper closure assembly |
| 05/08/2001 | US6227298 Well isolation system |
| 05/08/2001 | US6227226 Fire activated, fail safe, gate valve bonnet |
| 05/03/2001 | WO2001031329A1 Deposition monitoring system |
| 05/03/2001 | WO2001031328A1 Downhole deposition monitoring system |
| 05/03/2001 | WO2001031167A1 Flow control apparatus for use in a subterranean well |
| 05/02/2001 | CN2428566Y Oil-production vapour-injection well mouth |
| 05/01/2001 | US6223825 Swivel |
| 05/01/2001 | US6223824 Downhole apparatus |
| 04/30/2001 | CA2324573A1 Down hole tension/compression device for logging tools |
| 04/26/2001 | WO2001029368A1 Apparatus and method for controlling fluid flow with sand control |
| 04/25/2001 | EP1093540A1 Method and multi-purpose apparatus for control of fluid in wellbore casing |
| 04/24/2001 | US6220360 Downhole ball drop tool |
| 04/24/2001 | US6220359 Pump through safety valve and method |
| 04/24/2001 | US6220357 Downhole flow control tool |
| 04/24/2001 | US6220353 Full bore set down tool assembly for gravel packing a well |
| 04/18/2001 | EP1092834A1 Landfill gas control valve |
| 04/17/2001 | US6216784 Subsurface electro-hydraulic power unit |
| 04/11/2001 | EP1091087A2 Measurement port coupler and probe interface |
| 04/11/2001 | CN2426523Y Wellhead water-blending heat tracing device |
| 04/05/2001 | WO2001007748A3 Mechanism for dropping a plurality of balls into tubulars |
| 04/04/2001 | EP1088962A2 Floating apparatus for use in a well casing |
| 04/03/2001 | US6209663 Underbalanced drill string deployment valve method and apparatus |
| 04/03/2001 | US6209642 Apparatus and method for enhancing fluid and gas recovery in a well |
| 04/03/2001 | US6209636 Wellbore primary barrier and related systems |
| 04/03/2001 | CA2222205C Spoolable coiled tubing completion system |
| 03/29/2001 | WO2001021935A1 Valve for use in wells |
| 03/29/2001 | WO2001021934A1 Downhole safety valve |
| 03/29/2001 | CA2384052A1 Downhole safety valve |
| 03/28/2001 | EP1086293A1 Downhole dump valve |
| 03/27/2001 | US6206645 Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 03/27/2001 | US6206338 Fail as-is hydraulic actuator |
| 03/22/2001 | WO2001020124A1 Method and apparatus for through tubing gravel packing, cleaning and lifting |
| 03/21/2001 | EP0852653A4 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
| 03/20/2001 | US6202752 Wellbore milling methods |
| 03/20/2001 | US6202742 Pack-off device for use in a wellbore having a packer assembly located therein |
| 03/15/2001 | WO2001018357A2 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 03/14/2001 | EP1082546A2 A device and method for regulating fluid flow in a well |
| 03/14/2001 | EP1082517A1 Generating commands for a downhole tool |
| 03/13/2001 | US6200152 Electrical connection |
| 03/13/2001 | US6199636 Open barrel cage |
| 03/13/2001 | US6199629 Computer controlled downhole safety valve system |
| 03/08/2001 | WO2001016461A1 Valve with secondary load bearing surface |
| 03/06/2001 | US6196261 Flapper valve assembly with seat having load bearing shoulder |
| 03/06/2001 | US6196064 In situ underground sample analyzing probe |
| 03/01/2001 | WO2001014685A1 Electrical surface activated downhole circulating sub |
| 02/28/2001 | EP1078145A2 Coupling with shape-memory material , disconnecting tool with a piston and coupling with valves |
| 02/28/2001 | EP0705379B1 Tool for use in wellbore operations |
| 02/27/2001 | US6192988 Production well telemetry system and method |
| 02/27/2001 | US6192983 Coiled tubing strings and installation methods |
| 02/27/2001 | US6192980 Method and apparatus for the remote control and monitoring of production wells |
| 02/22/2001 | WO2001012950A1 Failsafe safety valve |
| 02/22/2001 | WO2001012949A2 Downhole flapper valve assembly |
| 02/22/2001 | WO2000019060A8 Tubular filling system |
| 02/20/2001 | US6189619 Sliding sleeve assembly for subsurface flow control |
| 02/20/2001 | CA2053919C Valves |
| 02/15/2001 | WO2001011187A1 Pump systems and methods |
| 02/13/2001 | US6186237 Annulus check valve with tubing plug back-up |
| 02/13/2001 | US6186227 Packer |
| 02/13/2001 | CA2222200C Spoolable coiled tubing completion system |
| 02/13/2001 | CA2222194C Spoolable coiled tubing completion system |
| 02/13/2001 | CA2222191C Spoolable coiled tubing completion system |
| 02/13/2001 | CA2222182C Spoolable coiled tubing completion system |
| 02/13/2001 | CA2222102C Spoolable coiled tubing completion system |
| 02/13/2001 | CA2111735C Pressure change signals for remote control of downhole tools |
| 02/06/2001 | US6182766 Drill string diverter apparatus and method |
| 02/06/2001 | US6182764 Generating commands for a downhole tool using a surface fluid loop |
| 02/06/2001 | US6182762 Storm valve |
| 02/01/2001 | WO2001007748A2 Mechanism for dropping a plurality of balls into tubulars |
| 01/31/2001 | CN2417286Y Separated oil prodn. pump |
| 01/30/2001 | US6179052 Digital-hydraulic well control system |
| 01/25/2001 | WO2001006130A1 Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 01/25/2001 | WO2001006086A1 Downhole bypass valve |
| 01/24/2001 | EP1070195A1 A valve, a float shoe and a float collar for use in the construction of oil and gas wells |
| 01/23/2001 | US6176466 Composite pumping tree with integral shut-off valve |
| 01/23/2001 | US6176327 Method and toolstring for operating a downhole motor |
| 01/23/2001 | US6176318 Actuator apparatus and method for downhole completion tools |
| 01/23/2001 | US6176316 Subsea well head assembly |
| 01/23/2001 | US6176312 Method and apparatus for the remote control and monitoring of production wells |
| 01/23/2001 | US6176311 Downhole cutting separator |
| 01/23/2001 | CA2124676C Mud check valves in drilling apparatus (wells) |
| 01/18/2001 | WO2001004456A1 Lubricator for underbalanced drilling |
| 01/18/2001 | DE10028015A1 Adding a liner to a borehole by inserting liner on a mandrel, injecting liquid between the liner and the borehole and expanding the liner onto the wall |
| 01/17/2001 | EP1069279A2 Flapper valve with biasing flapper closure assembly |
| 01/17/2001 | EP1068425A1 Drillstring with stabilisers for re-entering a primary wellbore |
| 01/16/2001 | US6173785 Pressure-balanced rod piston control system for a subsurface safety valve |
| 01/16/2001 | US6173784 Method and device for production of hydrocarbons |
| 01/16/2001 | US6173783 Method of completing and producing hydrocarbons in a well |