| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 06/20/2013 | CA2853032A1 Fluid flow control |
| 06/20/2013 | CA2770088A1 Ball drop wellhead control apparatus |
| 06/19/2013 | EP2604787A1 Subsea operating valve connectable to low pressure recipient |
| 06/19/2013 | CN203008857U Sliding sleeve switching tool |
| 06/19/2013 | CN203008856U Cement buoyancy valve in gas pump drainage hole operating sleeve |
| 06/19/2013 | CN203008855U Three-stage choke blowout manifold |
| 06/19/2013 | CN203008854U Special ball valve for testing |
| 06/19/2013 | CN203008853U Valve type casing burglar alarm |
| 06/19/2013 | CN203008852U Oilfield metering multi-way valve |
| 06/19/2013 | CN203008829U Two-channel watering control valve |
| 06/19/2013 | CN103161427A Multifunctional continuous circulating safety valve |
| 06/19/2013 | CN103161426A Divided-flow check valve |
| 06/19/2013 | CN103161425A Subsea operating valve connectable to low pressure recipient |
| 06/19/2013 | CN103161424A Gas well wellhead pressure-reducing well opening device |
| 06/19/2013 | CN103161423A Lock assembly for hydraulic fracing valve |
| 06/19/2013 | CN101929320B Power swivel |
| 06/18/2013 | US8464799 Control system for a surface controlled subsurface safety valve |
| 06/18/2013 | US8464795 Annulus isolation valve |
| 06/18/2013 | US8464787 Resilient foam debris barrier |
| 06/18/2013 | CA2731161C Selective fracturing tool |
| 06/18/2013 | CA2671444C Restriction element trap for use with and actuation element of a downhole apparatus and method of use |
| 06/18/2013 | CA2635816C Downhole linear actuation apparatus and method |
| 06/16/2013 | CA2762480A1 An inflow control valve for controlling the flow of fluids into a generally horizontal production well and method of using the same |
| 06/13/2013 | WO2013085665A1 Ball seat milling and re-fracturing method |
| 06/13/2013 | WO2013085662A1 Treatment plug and method of anchoring a treatment plug and then removing a portion thereof |
| 06/13/2013 | WO2013085496A1 Bidirectional downhole fluid flow control system and method |
| 06/13/2013 | WO2012100259A3 Telemetry operated circulation sub |
| 06/13/2013 | WO2012085597A3 Valve assembly |
| 06/13/2013 | US20130146303 Subsea Operating Valve Connectable to Low Pressure Recipient |
| 06/13/2013 | CA2857125A1 Ball seat milling and re-fracturing method |
| 06/13/2013 | CA2850725A1 Bidirectional downhole fluid flow control system and method |
| 06/12/2013 | CN202990968U Compound control auxiliary pipe for down-hole casing valve |
| 06/12/2013 | CN202990967U Switching type sliding sleeve fracturing valve |
| 06/12/2013 | CN202990966U Washing and squeezing double-acting valve |
| 06/12/2013 | CN202990965U Anti-theft tee joint type oil nipple sleeve of oil well |
| 06/12/2013 | CN202990964U Continuous ball throwing device for multistage fracturing |
| 06/12/2013 | CN202990963U Portable large-drift-diameter high-pressure flat valve |
| 06/12/2013 | CN202990962U Large-drift-diameter high-pressure flat valve |
| 06/12/2013 | CN202990961U Producing, metering and automatic well-reversing device for unattended oil regions |
| 06/12/2013 | CN103154426A Methods for completing multi-zone production wells using sliding sleeve valve assembly |
| 06/12/2013 | CN103147722A Underground remote control sliding sleeve opening or closing device |
| 06/12/2013 | CN103147721A Pulsed steam distributing valve |
| 06/12/2013 | CN103147720A Hydraulic switching valve |
| 06/12/2013 | CN103147719A Spring type automatic grout valve |
| 06/12/2013 | CN103147718A 20000 psi cage type throttle valve |
| 06/12/2013 | CN103147717A Emergency cutoff valve |
| 06/12/2013 | CN103147715A Shear pin type automatic grouting valve |
| 06/12/2013 | CN102016373B Gate valve actuator and method |
| 06/12/2013 | CN101975042B Fully functional anti-spouting oil drain device |
| 06/11/2013 | US8459376 System for drilling under balanced wells |
| 06/11/2013 | US8459365 Apparatus for creating bidirectional rotary force or motion in a downhole device and method for using same |
| 06/11/2013 | US8459364 Method and device for securing a well |
| 06/11/2013 | US8459363 Control mechanism for subsurface safety valve |
| 06/11/2013 | CA2734871C Annulus isolation valve |
| 06/06/2013 | WO2013082386A1 Pump actuated valve |
| 06/06/2013 | WO2012174113A3 Managing treatment of subterranean zones |
| 06/06/2013 | WO2012168614A3 Method for determing the complex response of a permeable stratum |
| 06/06/2013 | US20130140040 Downhole fluid recirculation valve |
| 06/06/2013 | US20130140038 Bidirectional Downhole Fluid Flow Control System and Method |
| 06/06/2013 | US20130140033 Actuator device |
| 06/06/2013 | CA2856979A1 Apparatus and method for controlling a downhole device |
| 06/06/2013 | CA2847831A1 Improved wireline drilling system |
| 06/05/2013 | CN202970663U Novel pressure-reducing device |
| 06/05/2013 | CN202970624U Downhole casing valve opening and closing tool |
| 06/05/2013 | CN202970623U One-way oil draining device |
| 06/05/2013 | CN202970622U Double-flow-passage check valve |
| 06/05/2013 | CN202970621U Device for controlling down-hole fluid during petroleum drilling |
| 06/05/2013 | CN202970620U Anchoring and oil draining device |
| 06/05/2013 | CN202970619U Under well casing valve core |
| 06/05/2013 | CN202970618U Positioning, clamping and locking structure suitable for mechanical downhole deployment valve |
| 06/05/2013 | CN202970617U Simple reducing valve of thermal recovery operation |
| 06/05/2013 | CN202970616U Pressure measuring ball valve used for one-time multilayer gravel pack tool |
| 06/05/2013 | CN103140646A Abrasive perforator with fluid bypass |
| 06/05/2013 | CN103132970A Staged fracturing oil tube system and application method thereof |
| 06/05/2013 | CN103132969A Staged fracturing sliding sleeve used for oil well and device and usage method thereof |
| 06/05/2013 | CN103132945A Water injection control valve |
| 06/05/2013 | CN101769140B Device for displacing oil underground, preventing reflow and automatically relieving pressure |
| 06/05/2013 | CN101581208B Water injector for automatically balancing downhole flow of oilfield |
| 06/04/2013 | US8453749 Control system for an annulus balanced subsurface safety valve |
| 06/04/2013 | US8453748 Subterranean well valve activated with differential pressure |
| 06/04/2013 | US8453746 Well tools with actuators utilizing swellable materials |
| 06/04/2013 | US8453745 Vortex controlled variable flow resistance device and related tools and methods |
| 06/04/2013 | US8453744 Downhole modulator apparatus |
| 06/04/2013 | US8453736 Method and apparatus for stimulating production in a wellbore |
| 05/30/2013 | WO2013075235A1 Inflow control solutions for wellbores |
| 05/30/2013 | US20130133897 Materials with environmental degradability, methods of use and making |
| 05/30/2013 | US20130133893 Debris removal system for downhole closure mechanism, and method thereof |
| 05/30/2013 | US20130133891 Equalization Valve |
| 05/30/2013 | CA2856474A1 Inflow control solutions for wellbores |
| 05/29/2013 | CN202954786U Oil pipe isolation valve |
| 05/29/2013 | CN202954785U Hydraulic bilateral control switch |
| 05/29/2013 | CN202954784U Slag prevention check valve for water injection well |
| 05/29/2013 | CN202954783U Novel check valve for well cementation |
| 05/29/2013 | CN202954782U Well mouth remote-controlled regulation emergency switching off protective device |
| 05/29/2013 | CN202954781U Gas well long-distance high-voltage device for opening and closing well |
| 05/29/2013 | CN103122752A Downhole control valve |
| 05/29/2013 | CN102094577B Core valve jet-suction hydraulic down-the-hole (DTH) hammer |
| 05/29/2013 | CN101421485B Method and system for controlling a downhole flow control device |
| 05/29/2013 | CA2809946A1 Tool and method for fracturing a wellbore |
| 05/29/2013 | CA2797485A1 Equalization valve |