| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 04/11/2013 | WO2013049937A1 Specific gravity valve |
| 04/11/2013 | WO2012170620A3 Sleeved ball seat |
| 04/11/2013 | US20130087386 Expandable apparatus and related methods |
| 04/11/2013 | US20130087344 Downhole valve assembly |
| 04/11/2013 | US20130087343 Dual Flow Gas Lift Valve |
| 04/11/2013 | US20130087341 Valve actuating apparatus |
| 04/11/2013 | US20130087326 Downhole Tester Valve Having Rapid Charging Capabilities and Method for Use Thereof |
| 04/11/2013 | US20130087323 Multi-function Surge Reduction Apparatus |
| 04/10/2013 | EP2578798A1 Valve and method of operating a valve |
| 04/10/2013 | EP2576970A2 Gate valve, method for returned drilling mud pressure control and/or well killing, and uses of a gate valve |
| 04/10/2013 | CN202866753U Electromagnetic type switch device for finding water shutoff under shaft |
| 04/10/2013 | CN202866752U Push type underground water finding and plugging switch |
| 04/10/2013 | CN202866751U Oil return circular self-heat-preservation well head equipment |
| 04/10/2013 | CN202866750U Big mouth diameter oil-gas extraction wellhead device |
| 04/10/2013 | CN202866749U Novel locking device for oilfield gate |
| 04/10/2013 | CN202866748U Novel corner type check valve |
| 04/10/2013 | CN202866730U Discontinued well anti-theft shut-in well device |
| 04/10/2013 | CN103038443A Method and apparatus for a well employing the use of an activation ball |
| 04/10/2013 | CN103038442A Subsea wellhead with a segmented fatigue reduction sleeve |
| 04/10/2013 | CN103038441A Subsea wellhead with controlled access to the annulus |
| 04/10/2013 | CN103038440A Insertion of a packoff into a wellhead |
| 04/09/2013 | US8413729 Apparatus and method for capping an underwater oil well |
| 04/06/2013 | CA2791468A1 Enhanced oilfield swellable elastomers and methods for making and using same |
| 04/04/2013 | WO2013048810A1 Multizone treatment system |
| 04/04/2013 | WO2013048696A1 Wellbore stimulation assemblies and methods of using the same |
| 04/04/2013 | WO2013048370A1 Wellbore flow control devices comprising coupled flow regulating assemblies and methods for use thereof |
| 04/04/2013 | WO2013015992A3 Selective hydraulic fracturing tool and method thereof |
| 04/04/2013 | WO2012178043A3 Injection line valve mechanism |
| 04/04/2013 | WO2012166930A3 Method of reducing deflection through a rod piston in a subsurface safety valve |
| 04/04/2013 | WO2012027276A3 Pump through circulating and or safety circulating valve |
| 04/04/2013 | US20130081827 Multizone treatment system |
| 04/04/2013 | US20130081824 Tubing retrievable injection valve assembly |
| 04/04/2013 | US20130081823 Valve |
| 04/04/2013 | US20130081817 Responsively Activated Wellbore Stimulation Assemblies and Methods of Using the Same |
| 04/04/2013 | US20130081801 Methods for Improving Coatings on Downhole Tools |
| 04/04/2013 | CA2850134A1 Multizone treatment system |
| 04/04/2013 | CA2849979A1 Ball valve float equipment |
| 04/04/2013 | CA2848420A1 Apparatus and method for galvanically removing from or depositing onto a device a metallic material downhole |
| 04/04/2013 | CA2847850A1 Wellbore stimulation assemblies and methods of using the same |
| 04/04/2013 | CA2847678A1 Wellbore flow control devices comprising coupled flow regulating assemblies and methods for use thereof |
| 04/03/2013 | CN202850949U Oil well valve single pipe flow path well mouth combined valve |
| 04/03/2013 | CN202850948U Blowout preventer for oil production well mouth |
| 04/03/2013 | CN202850947U Oil well valve electric pump flow well mouth combination valve |
| 04/03/2013 | CN202850946U Oil well valve watering-process ternary well mouth combined valve |
| 04/03/2013 | CN202850945U Compound seal plug valve with automatic-manual dual control function |
| 04/03/2013 | CN202850944U Air discharging device of oil well casing |
| 04/03/2013 | CN202850943U Anti-rotation throttle valve pore plate |
| 04/03/2013 | CN202850940U Float collar of controllable check valve |
| 04/03/2013 | CN103015949A Gas well gas production tree |
| 04/03/2013 | CN103015947A Solving method for out-of-control high-pressure petroleum blowout |
| 04/03/2013 | CN101538995B Method for replacing valve by utilizing borehole pressure |
| 04/03/2013 | CA2791673A1 Valve and method of operating a valve |
| 04/02/2013 | US8408337 Downhole blowout preventor |
| 04/02/2013 | US8408314 Multi-point chemical injection system for intelligent completion |
| 04/02/2013 | US8408307 Wellbore cleaning method and apparatus |
| 04/02/2013 | US8408306 Processes and systems for treating oil and gas wells |
| 04/02/2013 | CA2752773C Valve system for drilling systems |
| 04/02/2013 | CA2694851C Methods and apparatus for actuating a downhole tool |
| 04/02/2013 | CA2583806C Improved ball valve |
| 03/28/2013 | WO2012166638A3 Safety valve by-pass system for cable-deployed electric submersible pump |
| 03/28/2013 | US20130075112 Wellbore Flow Control Devices Comprising Coupled Flow Regulating Assemblies and Methods for Use Thereof |
| 03/28/2013 | US20130075111 Valve for velocity strings |
| 03/28/2013 | US20130075110 Debris Barrier for Hydraulic Disconnect Tools |
| 03/28/2013 | US20130075109 Barrier valve system and method of controlling same with tubing pressure |
| 03/28/2013 | US20130075108 Barrier valve system and method of closing same by withdrawing upper completion |
| 03/28/2013 | US20130075107 Method and apparatus for autonomous downhole fluid selection with pathway dependent resistance system |
| 03/28/2013 | US20130075106 Electrical generator for a cementing manifold |
| 03/28/2013 | US20130075101 Dump valve arrangement for fracturing tool set |
| 03/28/2013 | US20130075099 Pulse Fracturing Devices and Methods |
| 03/28/2013 | US20130075087 Module For Use With Completion Equipment |
| 03/27/2013 | CN202832524U Oil extraction shaft mouth antifreezing sampling device |
| 03/27/2013 | CN202832513U Tubular column pressure-testing device |
| 03/27/2013 | CN202832436U Directional well separate zone water injection ball-and-seat |
| 03/27/2013 | CN202832388U Tempering prevention valve for gas drilling |
| 03/27/2013 | CN202832387U Turning block oil drain device |
| 03/27/2013 | CN202832386U Rotary type bleeder |
| 03/27/2013 | CN202832385U Plug |
| 03/27/2013 | CN202832384U Water injection well uniflow sand prevention blanking plug |
| 03/27/2013 | CN202832383U Pneumatic-control water-injection-well safety valve |
| 03/27/2013 | CN202832382U Safety valve of ground hydraulic control water injection well |
| 03/27/2013 | CN202832381U Kelly bar plug valve |
| 03/27/2013 | CN202832380U Safety valve for float shoe or float collar |
| 03/27/2013 | CN202832379U Double sliding sleeves with salvageable ball seat and capable of being opened and closed selectively |
| 03/27/2013 | CN202832378U Diaphragm valve for water detection and drain |
| 03/27/2013 | CN202832377U Rail type switching valve |
| 03/27/2013 | CN202832376U Full-bore closable stratified sliding sleeve |
| 03/27/2013 | CN202832375U Breakable ball injection fracturing slide sleeve |
| 03/27/2013 | CN202832374U Device capable of adjusting oil nozzle |
| 03/27/2013 | CN202832373U Oil well well-cleaning port anti-theft device |
| 03/27/2013 | CN202832372U Flowing well port and steam injecting well port automatic pressure regulating oil transporting device |
| 03/27/2013 | CN202832371U Pressure unloading nozzle with changeable inner diameters |
| 03/27/2013 | CN202832352U Double floating type environment-friendly multifunctional well mouth sealing device |
| 03/27/2013 | CN202832339U Novel wellhead controller |
| 03/27/2013 | CN102996096A Emptying-free anti-pollution anti-theft sampling valve for oil well |
| 03/27/2013 | CN102155184B Quick release value for well head pneumatic safety valve |
| 03/27/2013 | CN101828000B Water control device using electromagnetics |
| 03/26/2013 | US8403067 Repeatable, compression set downhole bypass valve |
| 03/26/2013 | US8403063 Downhole ball mechanism with enhanced drift clearance |
| 03/26/2013 | US8403060 Wellhead tree pressure limiting device |
| 03/26/2013 | US8403055 Self sealing hydraulic coupler |