| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 03/04/2009 | CN201202445Y Oil field accompanying gas recovering device |
| 03/04/2009 | CN201202444Y Deep branch well oil extraction pipe column |
| 03/04/2009 | CN201202438Y Screw pump rod tube safety valve driven by rod |
| 03/04/2009 | CN201202437Y All-metal valve for oil extraction, well washing and acidizing |
| 03/04/2009 | CN201202436Y Natural gas well head emergent cut-off valve and automatic control device thereof |
| 03/04/2009 | CN201202435Y Changeable type three-safety floating hoop and floating shoe check valve |
| 03/04/2009 | CN201202434Y Constant-pressure vent valve suitable for offshore oil field |
| 03/04/2009 | CN201202433Y Net sheet loading type minitype flow controlling valve |
| 03/04/2009 | CN201202430Y Boring tool inner blowout preventer |
| 03/04/2009 | CN101379269A Mud flow back valve |
| 03/04/2009 | CN101377123A Oil intake valve of oil well pump capable of transferring pressure |
| 03/03/2009 | US7497265 Reclosable mechanical annular flow valve |
| 02/28/2009 | CA2639001A1 Controllable pressure reducing valve and device for the generation of pressure change signals |
| 02/26/2009 | WO2009026217A2 Switching apparatus between independent control systems for a subsurface safety valve |
| 02/26/2009 | WO2009025977A1 Downhole valve having incrementally adjustable open positions and a quick close feature |
| 02/26/2009 | WO2009024507A1 Oil field system for through tubing rotary drilling |
| 02/26/2009 | US20090050335 Downhole valve having incrementally adjustable open positions and a quick close feature |
| 02/26/2009 | US20090050333 Dual Control Line System and Method for Operating Surface Controlled Sub-Surface Safety Valve in a Well |
| 02/26/2009 | US20090050332 Ball valve |
| 02/26/2009 | US20090050327 Switching Apparatus Between Independent Control Systems for a Subsurface Safety Valve |
| 02/25/2009 | EP2028340A1 Oil field system for through tubing rotary drilling |
| 02/25/2009 | CN201198750Y Anti-high pressure reverse circulation valve |
| 02/25/2009 | CN201198749Y Leather cup self-sealing type reverse circulation valve |
| 02/25/2009 | CN101373024A Valve system and method |
| 02/25/2009 | CN101372887A Conditioning ferrous alloys into cracking susceptible and fragmentable elements for use in a well |
| 02/24/2009 | US7493962 Control line telemetry |
| 02/20/2009 | CA2635436A1 Dual control line system and method for operating surface controlled sub-surface safety valve in a well |
| 02/19/2009 | WO2009023613A2 Deformable ball seat |
| 02/19/2009 | WO2009023612A2 Ball seat having ball support member |
| 02/19/2009 | WO2009023611A2 Multi-position valve for fracturing and sand control and associated completion methods |
| 02/19/2009 | WO2009023610A2 Ball seat having fluid activated ball support |
| 02/19/2009 | WO2009023519A1 Reusable ball seat having ball support member |
| 02/19/2009 | US20090045368 Axially Energisable Ball Valve |
| 02/19/2009 | US20090044957 Fracturing plug convertible to a bridge plug |
| 02/19/2009 | US20090044955 Reusable ball seat having ball support member |
| 02/19/2009 | US20090044949 Deformable ball seat |
| 02/19/2009 | US20090044948 Ball seat having ball support member |
| 02/19/2009 | US20090044947 Flapper gas lift valve |
| 02/19/2009 | US20090044946 Ball seat having fluid activated ball support |
| 02/19/2009 | US20090044937 Remote actuation of downhole tools using fluid pressure from surface |
| 02/19/2009 | CA2696052A1 Flapper gas lift valve |
| 02/18/2009 | EP2025861A2 Remote actuation of downhole tools using fluid pressure from surface |
| 02/18/2009 | CN201196062Y Gas lift valve |
| 02/18/2009 | CN201196061Y Retrievable oil extraction automatic regulating device |
| 02/18/2009 | CN201196060Y Hydraulic switch sliding bush |
| 02/18/2009 | CN201196048Y Draining anchorage device |
| 02/18/2009 | CN101368634A 10000PSI ultra-low temperature butterfly shaped check valve |
| 02/17/2009 | US7490674 Dual cylinder lift pump and method of recovering fluids from subsurface formations |
| 02/12/2009 | WO2009020826A1 Shape memory alloy closure spring for subsurface safety valves triggered by well fluids |
| 02/12/2009 | WO2009020711A2 Flapper operating system without a flow tube |
| 02/12/2009 | US20090038804 Subsurface Safety Valve for Electric Subsea Tree |
| 02/11/2009 | EP2022933A2 Downhole valve assembly, actuation device for a downhole valve assembly and method of controlling fluid flow downhole |
| 02/11/2009 | CN201193734Y Strong magnetic code type anti-theft valve |
| 02/11/2009 | CN201193507Y Blowout prevention and well-washing polluting prevention switch under well |
| 02/11/2009 | CN201193506Y Blowout prevention pressure test oil drainage switch |
| 02/11/2009 | CN201193505Y Adjustable multifunction backflow-preventing and block-resistant single flow device |
| 02/11/2009 | CN201193504Y Big-diameter sliding bush switch |
| 02/11/2009 | CN201193503Y Spring balance type kelly plug valve |
| 02/11/2009 | CN201193502Y Water-mixed flowpath device |
| 02/10/2009 | US7487831 Downhole surge pressure reduction and filtering apparatus |
| 02/10/2009 | US7487829 Wellbore valve having linear magnetically geared valve actuator |
| 02/05/2009 | WO2008134700A3 Single line sliding sleeve downhole tool assembly |
| 02/05/2009 | US20090032261 Valve |
| 02/05/2009 | US20090032258 Openhole perforating |
| 02/05/2009 | US20090032241 Thru diverter wellhead with direct connecting downhole control |
| 02/05/2009 | US20090032238 Flapper Operating System Without a Flow Tube |
| 02/04/2009 | CN201190554Y Mechanically controlled multi-time on-off valve at downhole of oilfield and on-off tool |
| 02/04/2009 | CN201190553Y Drip |
| 02/04/2009 | CN201190552Y Mechanically controlled multi-time on-off valve |
| 02/04/2009 | CN201190551Y Natural gas emergency automatic cutting protection arrangement at oilfield wellhead |
| 02/04/2009 | CN101358517A Telemetry subsystem to communicate with plural downhole modules |
| 02/04/2009 | CN101358515A Well cleanout shunt |
| 02/03/2009 | US7484566 Pulse width modulated downhole flow control |
| 02/03/2009 | US7484559 Method for drilling and casing a wellbore with a pump down cement float |
| 02/03/2009 | CA2528722C Flow control apparatus for use in a wellbore |
| 01/29/2009 | US20090025936 Connection system for subsea flow interface equipment |
| 01/29/2009 | US20090025930 Continuous flow drilling systems and methods |
| 01/29/2009 | US20090025927 Wellbore cleaning method & apparatus |
| 01/29/2009 | US20090025923 Technique and system for completing a well |
| 01/28/2009 | CN201187299Y Pouring assemble water well head sampling apparatus |
| 01/28/2009 | CN201187294Y Electromagnetic valve for oil field wireless well logging |
| 01/28/2009 | CN201187291Y Transposition power mechanism of ring pressure control test valve |
| 01/28/2009 | CN201187286Y Intelligent well layered oil-finding control device |
| 01/28/2009 | CN201187279Y Downhole differential pressure type normal open valve |
| 01/28/2009 | CN201187275Y Double-tube water-blending process flow well head composite device |
| 01/28/2009 | CN201187274Y Single tube annular process flow well head composite device |
| 01/28/2009 | CN201187273Y Well head composite device for adjusting electric pump well flow |
| 01/27/2009 | CA2548458C Hydraulically releaseable inflation tool for permanent bridge plug |
| 01/27/2009 | CA2529913C Technique and apparatus for completing multiple zones |
| 01/27/2009 | CA2509928C Apparatus and method to detect actuation of a flow control device |
| 01/22/2009 | WO2009012020A1 Flapper mounted equalizer valve for subsurface safety valves |
| 01/22/2009 | WO2008070271A4 System and method for facilitating downhole operations |
| 01/22/2009 | US20090020293 Downhole linear actuation apparatus and method |
| 01/22/2009 | US20090020291 Flapper Mounted Equalizer Valve for Subsurface Safety Valves |
| 01/22/2009 | US20090020290 Frangible flapper valve with hydraulic impact sleeve |
| 01/22/2009 | US20090020288 Method and Apparatus for a Cold Flow Subsea Hydrocarbon Production System |
| 01/22/2009 | US20090020285 Reverse-Circulation Cementing of Surface Casing |
| 01/21/2009 | CN201184447Y Cipher anti-theft valve |
| 01/21/2009 | CN201184187Y Fixed value pressure relief balanced system of well logging instrument |
| 01/21/2009 | CN201184168Y Guide strengthening double-ball fixing valve assembly |