| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 08/07/2008 | WO2008092241A1 A method for providing a preferential specific injection distribution from a horizontal injection well |
| 08/07/2008 | CA2676990A1 Rupture disc assembly that withstands much higher back pressures than actuation pressure |
| 08/07/2008 | CA2676679A1 A method for providing a preferential specific injection distribution from a horizontal injection well |
| 08/06/2008 | EP1951988A2 Downhole tool |
| 08/06/2008 | CN201095977Y Gas lift pipe column for hot washing protective oil layer and no-killing operation |
| 08/06/2008 | CN201095975Y Salvaging type gas lift valve for gas lift oil extraction |
| 08/06/2008 | CN201095974Y Uniflow valve throwing in and fishing out by steel wire operation |
| 08/06/2008 | CN201095965Y Multilateral well pipe string ball seat joint |
| 08/06/2008 | CA2583041A1 Plunger lift system |
| 08/05/2008 | US7407011 Tubing annulus plug valve |
| 08/05/2008 | CA2482290C Cement-through, tubing-retrievable safety valve |
| 07/31/2008 | WO2008091345A1 Casing valves system for selective well stimulation and control |
| 07/31/2008 | WO2006001974A3 Pressure monitoring of control lines for tool position feedback |
| 07/31/2008 | CA2821500A1 Casing valves system for selective well stimulation and control |
| 07/31/2008 | CA2676328A1 Casing valves system for selective well stimulation and control |
| 07/30/2008 | EP1676066A4 Internal blow out preventer ball and seat |
| 07/30/2008 | CN201092852Y Throwing-dragging type unaflow valve blocking machine |
| 07/29/2008 | US7404446 Well tool protection system and method |
| 07/29/2008 | CA2390889C Method and apparatus for selective injection or flow control with through-tubing operation capacity |
| 07/24/2008 | US20080173454 Positional control of downhole actuators |
| 07/23/2008 | CN201090205Y Centralized monitoring baffling and kill-job device |
| 07/23/2008 | CN201090180Y Oil-discharging device for rotating oil tube |
| 07/23/2008 | CN201090179Y Anti-aspiration bypass valve |
| 07/23/2008 | CN201090178Y Sliding bush switch for compression fracture and acidizing of horizontal well |
| 07/23/2008 | CN201090177Y Multifunctional check valve |
| 07/23/2008 | CN201090176Y Sliding bush type valve seat regulating valve |
| 07/23/2008 | CN201090174Y Steel body sealing float collar and float shoe for oil field well-cementing |
| 07/23/2008 | CN201090167Y Anti-dropping oil well pipe anti-spraying jam |
| 07/22/2008 | CA2533779C Safety valve for use in an injection well |
| 07/22/2008 | CA2495524C Apparatus and method for installation of subsea well completion systems |
| 07/22/2008 | CA2431373C Snap-lock seal for seal valve assembly |
| 07/22/2008 | CA2380286C Mechanism for dropping a plurality of balls into tubulars used in drilling, completion and workover of oil, gas and geothermal wells, and method of using same |
| 07/22/2008 | CA2303662C Mud saver kelly valve |
| 07/17/2008 | US20080169106 Method and Apparatus for Fluid Bypass of a Well Tool |
| 07/17/2008 | US20080169105 Convertible seal |
| 07/17/2008 | CA2756050A1 Apparatus for welhead high integrity protection system |
| 07/16/2008 | CN201087728Y Windstorm valve |
| 07/16/2008 | CN201087727Y Pressure-selecting control mechanism of pressure-selecting control test switch valve |
| 07/16/2008 | CN201087726Y Manual reversing sampling valve |
| 07/16/2008 | CN201087709Y Well-control valve switching device under pressure |
| 07/15/2008 | US7398830 Electric-hydraulic power unit |
| 07/15/2008 | CA2530995C System and method for gas shut off in a subterranean well |
| 07/15/2008 | CA2502305C Mud pulse landing assembly for use in directional drilling |
| 07/15/2008 | CA2481757C Well tool protection system and method |
| 07/15/2008 | CA2423232C Improved well testing system |
| 07/15/2008 | CA2243793C Flow control apparatus for use in a subterranean well and associated methods |
| 07/15/2008 | CA2187010C Method and appartus for remote control of wellbore end devices |
| 07/10/2008 | WO2008083202A1 Safety valve with flapper/flow tube friction reducer |
| 07/10/2008 | WO2008082307A1 Pressure driven apparatus for sequential control of a cementing head |
| 07/10/2008 | WO2008060892A3 Tubing pressure insensitive control system |
| 07/10/2008 | WO2008060892A2 Tubing pressure insensitive control system |
| 07/10/2008 | US20080164035 Downhole Safety Valve Apparatus and Method |
| 07/09/2008 | EP1941124A1 Applications of low power bistable actuators downhole |
| 07/09/2008 | CN201083127Y Anti-freezing anti-theft sampling pipe plug |
| 07/09/2008 | CN201083111Y Water injection well non-killing well environmental protection operation down-hole switch |
| 07/09/2008 | CN201083110Y Flow control valve |
| 07/09/2008 | CN201083109Y Back pressure valve |
| 07/09/2008 | CN201083108Y Regulating valve for adjusting liquid flux and pressure of injection pipeline |
| 07/09/2008 | CN201083103Y Protection lathe dog head for oil water well |
| 07/09/2008 | CN101215960A Light well head device for single well production |
| 07/03/2008 | WO2008079992A1 Pressure-balanced choke system |
| 07/03/2008 | WO2008079985A1 Linear motor to control hydraulic force |
| 07/03/2008 | WO2008079782A2 Production actuated mud flow back valve |
| 07/03/2008 | WO2008079777A2 Material sensitive downhole flow control device |
| 07/03/2008 | WO2008079694A1 Charged chamber pressure transmitter for subsurface safety valves |
| 07/03/2008 | US20080156497 Safety Valve With Flapper/Flow Tube Friction Reducer |
| 07/03/2008 | CA2673055A1 Pressure-balanced choke system |
| 07/03/2008 | CA2673051A1 Linear motor to control hydraulic force |
| 07/03/2008 | CA2672754A1 Material sensitive downhole flow control device |
| 07/02/2008 | EP1937935A1 Flow reversing apparatus and methods of use |
| 07/02/2008 | CN201080820Y Skid-mounted oilfield intelligent flow stabilizing water-dispensing valve set |
| 07/02/2008 | CN201080808Y Lifting and hanging type oil drainage device |
| 07/02/2008 | CN201080807Y Ceramic nozzle tip |
| 07/02/2008 | CN201080806Y Concentric tube stratified steam injection wellhead device |
| 07/02/2008 | CN100398778C Method of fluid flowing in main cylinder via template guide cylinder, and template guide cylinder |
| 07/01/2008 | US7392849 Balance line safety valve with tubing pressure assist |
| 07/01/2008 | US7392839 Single line sliding sleeve downhole tool assembly |
| 06/26/2008 | DE112005000893T5 Werkzeugfangvorrichtung und -verfahren Tool safety gear and procedures |
| 06/25/2008 | CN201078328Y Differential type down-hole hydraulic oil well pump |
| 06/25/2008 | CN201078217Y Stream commutator |
| 06/25/2008 | CN101205803A Well washing apparatus |
| 06/25/2008 | CN101205802A Constant pressure arrangement |
| 06/24/2008 | US7389819 Well screen |
| 06/21/2008 | CA2612357A1 2d well testing with smart plug sensors |
| 06/19/2008 | WO2008071044A1 A milti-way valve with fan-shape passage sealing pairs |
| 06/19/2008 | US20080142229 Apparatus for Radially Expanding and Plastically Deforming a Tubular Member |
| 06/18/2008 | CN201074515Y Anti-theft sampling valve for oil extractor |
| 06/18/2008 | CN201074514Y Anti-theft sampler of oil well head |
| 06/18/2008 | CN201074503Y Drawing type device for discharging oil |
| 06/18/2008 | CN201074502Y Dual-valve plate type subsurface safety valve |
| 06/18/2008 | CN201074501Y Self-filling type current limiting valve |
| 06/18/2008 | CN201074500Y Anti-destruction shutter |
| 06/17/2008 | US7387165 System for completing multiple well intervals |
| 06/17/2008 | US7387164 Method and apparatus for selective injection or flow control with through-tubing operation capacity |
| 06/17/2008 | CA2572596C Flow control apparatus for use in a wellbore |
| 06/17/2008 | CA2486348C Choke valve with temperature transmitter |
| 06/17/2008 | CA2373164C Recovery of production fluids from an oil or gas well |
| 06/17/2008 | CA2370186C Method and multi-purpose apparatus for control of fluid in wellbore casing |
| 06/17/2008 | CA2370159C Downhole device for controlling fluid flow in a well |
| 06/14/2008 | CA2612397A1 Plug valve having a seal boss |