| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 02/05/2014 | CN203420660U Suction preventing device for wellhead of oil well |
| 02/05/2014 | CN103562490A System and method for servicing a wellbore |
| 02/05/2014 | CN103556971A Full-bore separate layer fracturing sliding sleeve for oil-gas well operation |
| 02/04/2014 | US8640776 Fluid injection device |
| 01/30/2014 | WO2014018210A1 Pipe-in-pipe shunt tube assembly |
| 01/30/2014 | WO2014015903A1 Subsea hydraulic power unit |
| 01/30/2014 | US20140027126 Autonomous valve |
| 01/30/2014 | US20140027125 Retrievable flow module unit |
| 01/30/2014 | US20140027104 Actuation Assembly for Downhole Devices in a Wellbore |
| 01/30/2014 | US20140026987 Relief valve for extracting sub-surface gas |
| 01/29/2014 | EP2690250A1 Running tool with independent housing rotation sleeve |
| 01/29/2014 | EP2522997B1 Monitoring hydrocarbon fluid flow |
| 01/29/2014 | CN203412563U Drillable slide sleeve |
| 01/29/2014 | CN203412547U Well-washing switch of packer |
| 01/29/2014 | CN203412546U Novel oil well flow regulator |
| 01/29/2014 | CN103547769A Formation treatment system and method |
| 01/29/2014 | CN103541699A Reverse-play preventing layering flow control flow string |
| 01/29/2014 | CN103541686A Switchable reverse circulation valve |
| 01/29/2014 | CN103541685A Reverse circulation valve allowing opening and closing |
| 01/29/2014 | CN102373899B Opening/closing valve for natural gas well mouth pipeline |
| 01/29/2014 | CN101688439B Christmas tree with internally positioned flowmeter |
| 01/28/2014 | US8636073 Segmented ball seat assembly valve |
| 01/28/2014 | US8636058 Straight-bore back pressure valve |
| 01/28/2014 | CA2749138C Methods and apparatus for a downhole tool |
| 01/28/2014 | CA2616501C Safety device for an oil well and associated safety installation |
| 01/23/2014 | US20140020904 Deep Set Subsurface Safety Valve with a Micro Piston Latching Mechanism |
| 01/23/2014 | US20140020903 Reclosable Multi Zone Isolation Tool and Method for Use Thereof |
| 01/23/2014 | US20140020902 Restricting production of gas or gas condensate into a wellbore |
| 01/23/2014 | US20140020894 Methods and devices for isolating wellhead pressure |
| 01/23/2014 | US20140020887 Eccentric safety valve |
| 01/22/2014 | EP2687672A2 Cartridge valve assembly for wellhead |
| 01/22/2014 | EP2686515A2 Pressure coring assembly and method |
| 01/22/2014 | CN203403862U Adjustable oil well sampling pressure-measuring burglarproof valve |
| 01/22/2014 | CN203403861U Oil field three-time oil production single-well injection proportion blending device |
| 01/22/2014 | CN103534522A Valve stem seal arrangement |
| 01/22/2014 | CN103527169A Throttle valve control system |
| 01/22/2014 | CN103527168A Throttle valve control system |
| 01/22/2014 | CN103527143A Pitching type fracturing valve |
| 01/22/2014 | CN103527142A Blowout prevention check valve structure in drill string |
| 01/22/2014 | CN103527141A Apparatus and method for engaging the back seat valve |
| 01/22/2014 | CN103527139A Drillable casing pipe float collar float shoe device |
| 01/22/2014 | CN102418496B Self-balanced underground full-bore check valve |
| 01/22/2014 | CN101821476B Flow restriction device |
| 01/21/2014 | US8631862 Self-sealing chemical injection line coupling |
| 01/21/2014 | CA2794331C Mechanical counter |
| 01/21/2014 | CA2662020C Method and apparatus for selective down hole fluid communication |
| 01/20/2014 | CA2821254A1 Cartridge valve assembly for wellhead |
| 01/16/2014 | WO2014011639A1 Variable inner diameter shear and seal ball valve |
| 01/16/2014 | WO2014011361A2 Wellbore servicing assemblies and methods of using the same |
| 01/16/2014 | WO2014011351A1 Formation treatment system |
| 01/16/2014 | WO2014011336A1 Downhole sleeve system and method |
| 01/16/2014 | WO2014011148A1 Electric subsurface safety valve with integrated communications system |
| 01/16/2014 | WO2013151686A9 System and method for reservoir pressure data analysis |
| 01/16/2014 | US20140014362 Opening a conduit cemented in a well |
| 01/16/2014 | US20140014360 Multi-cycle circulating tool |
| 01/16/2014 | US20140014359 Retrievable subsurface safety valve |
| 01/16/2014 | US20140014358 Downhole apparatus and method |
| 01/16/2014 | US20140014352 Downhole pressure compensating device |
| 01/16/2014 | US20140014351 Fluid flow control using channels |
| 01/16/2014 | US20140014347 Formation treatment system |
| 01/16/2014 | US20140014345 Check Valve for Well Stimulation |
| 01/16/2014 | US20140014340 Downhole sleeve system and method |
| 01/16/2014 | CA2877369A1 Multi-cycle circulating tool |
| 01/15/2014 | EP2683915A2 Flow control screen assembly having remotely disabled reverse flow control capability |
| 01/15/2014 | EP2683913A2 Check valve assembly for well stimulation operations |
| 01/15/2014 | CN203394496U Equal-drift-diameter conventional fracture well head and ground flow path |
| 01/15/2014 | CN203394484U Steam injection sliding sleeve of self-contained ball |
| 01/15/2014 | CN203394480U Layered acidification device for oil-water well |
| 01/15/2014 | CN203394475U Self-locking pitching sliding sleeve for oil and gas field |
| 01/15/2014 | CN203394451U Leak-sealing water-blocking oil extraction tubular column for heavy oil horizontal well |
| 01/15/2014 | CN203394450U High-pressure throwing-in and pulling eccentric gas lift working barrel |
| 01/15/2014 | CN203394438U Annulus safety valve for electric pump |
| 01/15/2014 | CN203394437U Automatic pressure relief and pressure test valve of underground pipe column of oil-water well |
| 01/15/2014 | CN203394436U Differential pressure type relief valve |
| 01/15/2014 | CN203394435U Gate fast replacing type copper sleeve for valve group of oil production station |
| 01/15/2014 | CN203394434U Underground sleeve pressure relief valve for heavy oil horizontal well |
| 01/15/2014 | CN203394433U Bypass switch combined valve |
| 01/15/2014 | CN203394424U Rapid controllable blowout prevention pipe plug |
| 01/15/2014 | CN103510928A Layered oil exploitation device |
| 01/15/2014 | CN103510915A Tool barrel with openable bottom |
| 01/15/2014 | CN103510914A Pressure bypass sucker rod valve body |
| 01/15/2014 | CN103510913A Packer throttle valve head |
| 01/15/2014 | CN103510912A Sliding sleeve assembly, device and system comprising sliding sleeve assemblies, and using method of system |
| 01/15/2014 | CN103510911A Shaft bottom leakage-proof plugging system and method for cementing well with same |
| 01/15/2014 | CN102337862B Variable-diameter fracturing valve |
| 01/14/2014 | US8627893 Apparatus and method for selective flow control |
| 01/14/2014 | US8627890 Rotating continuous flow sub |
| 01/14/2014 | US8627883 Downhole linear actuation apparatus and method |
| 01/09/2014 | WO2014008328A1 Resettable selective locking device |
| 01/09/2014 | WO2014007804A1 Check valve for well stimulation |
| 01/09/2014 | WO2012174600A8 A flushing tool and method of flushing perforated tubing |
| 01/09/2014 | US20140008080 Low Equivalent Circulation Density Setting Tool |
| 01/09/2014 | US20140008079 Valve arrangement for a production pipe |
| 01/09/2014 | US20140008075 Downhole shut-in device for pressure variation testing in gas lift wells |
| 01/09/2014 | US20140008071 Wellbore Servicing Assemblies and Methods of Using the Same |
| 01/09/2014 | US20140008055 Multi-function Surge Reduction Apparatus |
| 01/09/2014 | US20140008054 Control and supply unit |
| 01/09/2014 | US20140007954 Check Valve for Well Stimulation |
| 01/08/2014 | CN203383784U Hydraulic reducing ball seat casing pipe sliding sleeve switching tool for staged fracturing |
| 01/08/2014 | CN203383783U Closed-type bottom reversing switch |