| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 04/26/2005 | US6883613 Flow control apparatus for use in a wellbore |
| 04/26/2005 | CA2361284C Flow-operated valve |
| 04/26/2005 | CA2263486C Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 04/26/2005 | CA2236863C Down hole bypass valve |
| 04/21/2005 | WO2005035937A1 Mud flow back valve |
| 04/21/2005 | US20050082065 Pass through valve and stab tool |
| 04/21/2005 | US20050081918 Internal blow out preventer ball and seat |
| 04/21/2005 | US20050081916 Subsea valve assembly with replaceable fixed orifice insert |
| 04/19/2005 | US6880641 Subsurface safety valve and method for communicating hydraulic fluid therethrough |
| 04/19/2005 | US6880639 Downhole injection system |
| 04/19/2005 | US6880638 Device for an opening in an outer sleeve of a sleeve valve and a method for the assembly of a sleeve valve |
| 04/19/2005 | US6880402 Deposition monitoring system |
| 04/14/2005 | WO2005033470A1 Model hccv hydrostatic closed circulation valve |
| 04/14/2005 | WO2004094769A3 Improved well screen with internal shunt tubes exit nozzles and connectors with manifold |
| 04/14/2005 | WO2004081422A3 Protected integral cylinder valve, gas pressure regulator and flow meter, and method for refilling a gas cylinder so equipped |
| 04/13/2005 | EP1315881A4 Method and system for perforating |
| 04/13/2005 | CN2692341Y Oil well blow out prevention valve |
| 04/12/2005 | US6877566 Method and apparatus for causing pressure variations in a wellbore |
| 04/12/2005 | US6877564 Flapper closure mechanism |
| 04/12/2005 | US6877558 Apparatus and method for locating joints in coiled tubing operations |
| 04/12/2005 | US6877557 In-well monitoring and flow control system |
| 04/12/2005 | CA2369574C Choke valve with pressure transmitters |
| 04/12/2005 | CA2297034C Variable choke for use in a subterranean well and method of controlling a fluid flow |
| 04/07/2005 | US20050072578 Thermally-controlled valves and methods of using the same in a wellbore |
| 04/07/2005 | US20050072577 Apparatus for actuating a well tool and method for use of same |
| 04/07/2005 | US20050072576 Mud flow back valve |
| 04/07/2005 | US20050072575 Model HCCV hydrostatic closed circulation valve |
| 04/07/2005 | US20050072572 Downhole bypass valve |
| 04/06/2005 | EP1250514B1 Downhole wireless two-way telemetry system |
| 04/06/2005 | EP1250513B1 System and method for fluid flow optimization in a gas-lift oil well |
| 04/06/2005 | CN2690586Y Under balance under well casing valve |
| 04/06/2005 | CA2847463A1 Thermally-controlled valves and methods of using the same in a wellbore |
| 04/06/2005 | CA2847322A1 Thermally-controlled valves and methods of using the same in a wellbore |
| 04/06/2005 | CA2776435A1 Thermally-controlled valves and methods of using the same in a wellbore |
| 04/05/2005 | US6874579 Creating an underbalance condition in a wellbore |
| 03/31/2005 | WO2005028809A1 Subsea valve assembly with replaceable fixed orifice insert |
| 03/31/2005 | US20050067601 Valve closing device |
| 03/30/2005 | EP1519005A1 Cement-through, tubing-retrievable safety valve |
| 03/30/2005 | EP1518595A1 Subsea well production flow and separation system |
| 03/30/2005 | CN2688885Y Normally opened sliding valve with internal pressure control under oil extracting well |
| 03/30/2005 | CN2688884Y Integrated bridge valve under oil extracting well |
| 03/30/2005 | CN2688883Y Thermal extracting valve |
| 03/30/2005 | CN2688882Y Blowout preventive valve on oil extracting well top |
| 03/30/2005 | CN2688881Y Internal pressure normally opening sliding valve under oil extracting well |
| 03/30/2005 | CN2688874Y Device for anchoring, stabilizing, contacting and leakage preventing |
| 03/29/2005 | CA2345586C Packer annulus differential pressure valve |
| 03/24/2005 | WO2005026775A1 Closed-loop downhole resonant source |
| 03/24/2005 | WO2004070159A3 Apparatus and methods for drilling a wellbore using casing |
| 03/24/2005 | US20050061519 Cement-through, tubing retrievable safety valve |
| 03/24/2005 | US20050061515 Subsea well production flow system |
| 03/24/2005 | US20050061506 Well Treatment System and Method |
| 03/24/2005 | CA2535887A1 Closed-loop downhole resonant source |
| 03/23/2005 | EP1516104A1 A valve for a fill up tool |
| 03/23/2005 | EP1228290A4 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 03/23/2005 | EP1208284A4 Sliding sleeve assembly for subsurface flow control |
| 03/23/2005 | EP1147283B1 Multilateral well and electrical transmission system |
| 03/23/2005 | CN2687324Y Ball type single-flow valve |
| 03/23/2005 | CN2687323Y Multifunctional bottom valve for water injection |
| 03/23/2005 | CN2687322Y Soft-hard dual sealed mud valve |
| 03/22/2005 | US6869063 Sleeve valve and method for its assembly |
| 03/22/2005 | CA2384478C Delayed opening ball seat |
| 03/22/2005 | CA2377890C Variable downhole choke |
| 03/22/2005 | CA2276169C Downhole cutting separator |
| 03/22/2005 | CA2203241C Subsurface safety valve of minimized length |
| 03/19/2005 | CA2654524A1 Improving reservoir communication by creating a local underbalance and using treatment fluid |
| 03/17/2005 | WO2005024176A1 Method and apparatus to isolate a wellbore during pump workover |
| 03/17/2005 | US20050056430 Subsurface safety valve having a communication tool accessible non annular hydraulic chamber |
| 03/17/2005 | US20050056429 Well tool protection system and method |
| 03/17/2005 | US20050056419 Apparatus for wellbore communication |
| 03/17/2005 | US20050056414 Communication tool for accessing a non annular hydraulic chamber of a subsurface safety valve |
| 03/16/2005 | EP1226336A4 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 03/16/2005 | CN1594828A Control device for kill job |
| 03/16/2005 | CN1594826A Formation contaminant proof air sac packer |
| 03/15/2005 | US6868040 Wireless power and communications cross-bar switch |
| 03/15/2005 | US6866245 Valve closing device |
| 03/15/2005 | US6866101 Control system with failsafe feature in the event of tubing rupture |
| 03/15/2005 | US6866100 Mechanically opened ball seat and expandable ball seat |
| 03/15/2005 | US6866095 Downhole safety valve for central circulation completion system |
| 03/15/2005 | CA2302538C Production tubing shunt valve |
| 03/10/2005 | US20050051334 Electrical tubing control and remediation |
| 03/09/2005 | EP1511914A2 Equalizer valve and method of use |
| 03/09/2005 | CN2683839Y Double turning board type casing pipe backpressure valve |
| 03/09/2005 | CN2683838Y Single-board pressure spring type casing pipe backpressure valve |
| 03/09/2005 | CN2683837Y Multi-pipe packer well cleanup valve |
| 03/08/2005 | US6863126 Alternate path multilayer production/injection |
| 03/08/2005 | CA2210028C Hydrostatic tool with electrically operated setting mechanism |
| 03/03/2005 | WO2005019600A2 Hydraulically actuated control system for use in a subterranean well |
| 03/03/2005 | WO2005019596A1 Method and apparatus for adding a tubular to drill string with diverter |
| 03/03/2005 | CA2539039A1 Method and apparatus for adding a tubular to drill string with diverter |
| 03/02/2005 | EP1510650A2 Downhole surge pressure reduction and filtering apparatus |
| 03/02/2005 | EP1264073B1 Downhole surge pressure reduction and filtering apparatus |
| 03/02/2005 | EP1226332B1 Hydraulically set straddle packers |
| 03/02/2005 | CN2682195Y Plug valve for petroleum and natural gas drilling well |
| 03/01/2005 | US6860330 Choke valve assembly for downhole flow control |
| 03/01/2005 | US6860325 Downhole flow meter |
| 03/01/2005 | CA2360083C Valves for use in wells |
| 03/01/2005 | CA2358896C Method and apparatus for formation isolation in a well |
| 02/24/2005 | WO2002075104A8 Downhole tool |
| 02/24/2005 | US20050039925 Downhole ball drop tool |
| 02/24/2005 | US20050039922 Safety valve having extension spring closure mechanism |