| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 02/20/2008 | CN201024992Y Rotary oil leakage instrument |
| 02/20/2008 | CN201024991Y Under-well bushing exhaust valve |
| 02/20/2008 | CN201024990Y Heat preservation pressure fixing exhaust device |
| 02/20/2008 | CN201024989Y Resolvable release pressure valve for operation and construction at oil field production well |
| 02/20/2008 | CN201024988Y An overflow leakage flowing ball base |
| 02/20/2008 | CN201024987Y Separated multi-channel rotary valve |
| 02/20/2008 | CN201024986Y A self controlled pump well mouth valve |
| 02/20/2008 | CN201024985Y Movable freezing prevention and lockage release valve |
| 02/20/2008 | CN201024984Y Automatic control tube assembly for surrounding air pressure |
| 02/20/2008 | CN201024983Y Adjustable oil well filtering mesh mouth |
| 02/20/2008 | CN201024982Y A concrete extrusion and injection control tool |
| 02/20/2008 | CN201024980Y An oil field well fixing and self irrigation collision assembly |
| 02/20/2008 | CN201024977Y A multi-function concrete injection well fixing device |
| 02/20/2008 | CN201024966Y Ground ejection preventer control device |
| 02/20/2008 | CN201024964Y Ejection prevention automatic close device for oil pumping well mouth |
| 02/20/2008 | CN201024955Y Oil collection device for three-preventive combined well mouth |
| 02/19/2008 | US7331398 Multi-drop flow control valve system |
| 02/19/2008 | US7331396 Subsea production systems |
| 02/19/2008 | CA2568681C Gate valve with offset valve stem |
| 02/14/2008 | WO2008019234A1 Control line reducing hydraulic control system and control valve therefor |
| 02/14/2008 | US20080035353 Flapper Valve and Actuator |
| 02/14/2008 | US20080035349 Completion with telescoping perforation & fracturing tool |
| 02/14/2008 | CA2659891A1 Control line reducing hydraulic control system and control valve therefor |
| 02/13/2008 | CN201021614Y Secure valve for high pressure flow well mouth |
| 02/12/2008 | CA2481732C Remote operated coil connector apparatus |
| 02/12/2008 | CA2425242C Downhole crossover tool with chemical treating or packer inflation features |
| 02/12/2008 | CA2392277C Bottom hole assembly |
| 02/12/2008 | CA2376806C Tool string |
| 02/12/2008 | CA2363495C A method and apparatus for drilling off a floating structure |
| 02/12/2008 | CA2286018C High impact communication and control system |
| 02/09/2008 | CA2555668A1 Valve wheel lockup device |
| 02/07/2008 | US20080029275 System and method for pressure isolation for hydraulically actuated tools |
| 02/07/2008 | US20080029274 Downhole wet mate connection |
| 02/07/2008 | US20080029273 Valve |
| 02/06/2008 | CN101120152A Equalizing flapper for high slam rate applications |
| 02/06/2008 | CN101117885A Well control method for changing valve under pressure |
| 02/05/2008 | CA2454594C Method and apparatus for surge pressure reduction in a tool with fluid motivator |
| 01/30/2008 | CN201013367Y Oil well sampling detecting valve |
| 01/30/2008 | CN201013324Y Natural gas well stabilization production allocator |
| 01/30/2008 | CN201013310Y Oil well environment protective intelligent valve |
| 01/30/2008 | CN201013309Y Down-hole piezo-electric control switch for water finding and blocking of oil layer |
| 01/30/2008 | CN201013308Y Sand-proof oil drain valve |
| 01/30/2008 | CN201013307Y Setting sealing repeatable hydraulic anchoring draining device |
| 01/30/2008 | CN201013306Y Down-well cannula switch |
| 01/30/2008 | CN201013305Y High-pressure injection gate leak-proof switching device |
| 01/30/2008 | CN201013304Y Oil conduit pressure testing valve |
| 01/30/2008 | CN201013303Y Weighting drill stem plug-catch spraying-proof device with plug-catch screen pipe |
| 01/30/2008 | CN201013299Y Boring tool inside blow-out preventer without lateral force |
| 01/30/2008 | CN201013280Y Backpressure valve hydraulic fetching apparatus |
| 01/30/2008 | CN101113663A Mechanical water-shutoff construction method of mine hydrophthalmos and plugging apparatus for water-shutoff |
| 01/29/2008 | US7322419 Circulating sub and method |
| 01/29/2008 | US7322417 Technique and apparatus for completing multiple zones |
| 01/29/2008 | CA2466761C Optical position sensing for well control tools |
| 01/29/2008 | CA2187422C Downhole production well control system and method |
| 01/24/2008 | WO2007140021A3 Safety vent valve |
| 01/24/2008 | US20080017373 Multiple zone downhole intelligent flow control valve system and method for controlling commingling of flows from multiple zones |
| 01/24/2008 | US20080017368 Well Operations System |
| 01/22/2008 | CA2425449C Gas-lock re-prime device for submersible pumps |
| 01/17/2008 | US20080011480 Downhole surge pressure reduction and filtering apparatus |
| 01/16/2008 | CN201007208Y Well head anti-freeze and anti-theft sampling apparatus |
| 01/16/2008 | CN201007196Y Injection-pick-pump oil drainage device |
| 01/16/2008 | CN201007195Y Annular self thermal insulation anti-freeze well head packaging group valve |
| 01/15/2008 | CA2487012C Method and apparatus to reduce downhole surge pressure using hydrostatic valve |
| 01/15/2008 | CA2226289C System for controlling production from a gas-lifted oil well |
| 01/10/2008 | WO2008005768A1 Hydraulic metering valve for operation of downhole tools |
| 01/10/2008 | WO2008005495A1 Step ratchet mechanism |
| 01/10/2008 | WO2008005088A2 Dual cylinder lift pump system and method |
| 01/10/2008 | WO2008004876A1 A method and a device for counteracting that a valve ' s functionality is reduced |
| 01/10/2008 | WO2008004875A1 Method for flow control and autonomous valve or flow control device |
| 01/10/2008 | CA2657209A1 Method for flow control and autonomous valve or flow control device |
| 01/10/2008 | CA2656619A1 Method for improved well control with a downhole device |
| 01/09/2008 | EP1875037A1 Valve |
| 01/09/2008 | EP1379755B1 Wireline retrievable safety valve with radial cutting device |
| 01/09/2008 | CN201003393Y Two-tube assembled valve set for water-mixing flow |
| 01/09/2008 | CN101100932A High-pressure water injection well head device |
| 01/03/2008 | WO2005052302A3 Actuating mechanism |
| 01/03/2008 | US20080000697 Systems and Methods for Completing a Multiple Zone Well |
| 01/03/2008 | US20080000643 Hydraulic metering valve for operation of downhole tools |
| 01/03/2008 | US20080000642 Wireline slip hanging bypass assembly and method |
| 01/03/2008 | US20080000631 Dual cylinder lift pump and method of recovering fluids from subsurface formations |
| 01/02/2008 | EP1871977A1 Direct proportional surface control system for downhole choke |
| 01/02/2008 | CN200999611Y Theftproof sampling valve for oil well |
| 01/02/2008 | CN200999610Y Oil well head multiple anti-theft sampler |
| 01/02/2008 | CN200999604Y Automatically reopening type air drilling down-hole extingiushment joint |
| 01/02/2008 | CN200999603Y Repeatedly-usable type hole sealing water stop device |
| 01/01/2008 | US7314091 Cement-through, tubing retrievable safety valve |
| 01/01/2008 | US7314086 Well operations system |
| 01/01/2008 | US7314085 Well operations system |
| 12/27/2007 | WO2007149795A2 Wellbore valve having linear magnetically geared valve actuator |
| 12/27/2007 | WO2007148978A1 A regulating device and methods of using same |
| 12/27/2007 | US20070295512 Throttle valve for injecting a fluid into geological formations |
| 12/27/2007 | US20070295511 Access apparatus from a tubular into a downhole hydraulic control circuit |
| 12/27/2007 | US20070295507 Valve Seat |
| 12/27/2007 | CA2654526A1 Wellbore valve having linear magnetically geared valve actuator |
| 12/27/2007 | CA2653464A1 A regulating device and methods of using same |
| 12/26/2007 | CN200996293Y Safety embedded oil-sampling valve |
| 12/26/2007 | CN200996289Y Anti-freezing and sandproof current regulater of air well under well |
| 12/26/2007 | CN200996281Y Environmental-protecting metering switch under well |
| 12/26/2007 | CN101092872A Method for laying stations at level of upper branches of collection and transportion branches in low producing gas field in low pressure and low penetrability |
| 12/26/2007 | CN101092871A Self-controlled closing valve for guarding against theft |