| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 04/22/2008 | US7360600 Subsurface safety valves and methods of use |
| 04/22/2008 | CA2524666C Wellbores utilizing fiber optic-based sensors and operating devices |
| 04/18/2008 | CA2607043A1 Seal assembly energized with floating pistons |
| 04/17/2008 | US20080087439 Configurable wellhead system with permanent fracturing spool and method of use |
| 04/16/2008 | CN201047270Y Frequently open type bottom hole back-pressure valve |
| 04/16/2008 | CN201047269Y Valve theft-proof lock cover |
| 04/15/2008 | CA2365656C Downhole flow rate controle device |
| 04/10/2008 | US20080083541 Apparatus For Radially Expanding And Plastically Deforming A Tubular Member |
| 04/09/2008 | CN201045289Y Jack well multifunctional sleeve air-release valve |
| 04/08/2008 | US7353878 Apparatus and method for wellbore isolation |
| 04/08/2008 | CA2365693C A downhole actuator including a sealing bellows |
| 04/08/2008 | CA2295269C Torsion spring connections for downhole flapper |
| 04/03/2008 | US20080078553 Downhole isolation valve and methods for use |
| 04/02/2008 | CN201043453Y Backpressure valve |
| 04/02/2008 | CN201043452Y Multifunctional sluice valve for drilling rig |
| 04/01/2008 | US7350590 Instrumentation for a downhole deployment valve |
| 04/01/2008 | US7350582 Wellbore tool with disintegratable components and method of controlling flow |
| 04/01/2008 | CA2474063C System and method for a failsafe control of a downhole valve in the event of tubing rupture |
| 04/01/2008 | CA2167423C Shifting tool |
| 03/27/2008 | WO2008036570A2 Downhole hydraulic control system with failsafe features |
| 03/27/2008 | WO1999057417A3 Chemical actuation system for downhole tools and method for detecting failure of an inflatable element |
| 03/26/2008 | EP1756393B1 Valve seat |
| 03/26/2008 | CN201041015Y Multifunctional screw type check plate valve |
| 03/26/2008 | CN101148977A Oil-tube draining device |
| 03/26/2008 | CN101148976A Non-well killing change christmas tree device and using method thereof |
| 03/25/2008 | US7347289 Dart-operated big bore by-pass valve |
| 03/25/2008 | US7347288 Ball operated by-pass tool for use in drillstring |
| 03/25/2008 | US7347286 Drill string valve assembly |
| 03/25/2008 | US7347275 Apparatus and method to detect actuation of a flow control device |
| 03/25/2008 | US7347272 Formation isolation valve |
| 03/25/2008 | US7347270 Redundant hydraulic system for safety valve |
| 03/25/2008 | CA2504300C Isolation assembly for coiled tubing |
| 03/25/2008 | CA2492402C Indexing apparatus |
| 03/20/2008 | WO2008032112A1 Well construction and completion |
| 03/20/2008 | WO2008005495A8 Step ratchet mechanism |
| 03/20/2008 | WO2008002473A3 Wireline slip hanging bypass assembly and method |
| 03/20/2008 | WO2007112042A3 Downhole tool with c-ring closure seat |
| 03/20/2008 | US20080066921 Downhole hydraulic control system with failsafe features |
| 03/19/2008 | EP1702136B1 Controlling a fluid well |
| 03/19/2008 | EP1282757B1 Subsea riser disconnect and method |
| 03/19/2008 | EP0927295B1 Wellbore milling system |
| 03/19/2008 | CN201037400Y Pipe column switch for finding water |
| 03/19/2008 | CN201037399Y Backflow-preventing check valve and backflow-preventing check valve device for the same |
| 03/19/2008 | CN201037398Y Down-hole intelligence switch |
| 03/19/2008 | CN201037397Y Oil pipe and sheath imports and exports fast switching device |
| 03/18/2008 | US7343983 Method and apparatus for isolating and testing zones during reverse circulation drilling |
| 03/18/2008 | US7343932 Multiple line administration |
| 03/13/2008 | US20080060815 Wellhead seal unit |
| 03/13/2008 | US20080060813 Casing Shoes and Methods of Reverse-Circulation Cementing of Casing |
| 03/13/2008 | US20080060801 Flexible matrix composite actuator for use in subsurface wellbores |
| 03/12/2008 | EP1898045A1 Electrically operated well tools |
| 03/12/2008 | CN201034020Y Christmas tree gate under-pressure repairing apparatus |
| 03/12/2008 | CN101139918A Layered water blocking device for oil exploitation well |
| 03/11/2008 | US7341108 Well downhole liquid dispenser |
| 03/11/2008 | CA2488475C Downhole fluid pumping apparatus and method |
| 03/11/2008 | CA2450815C Method and apparatus for replacing bop with gate valve |
| 03/11/2008 | CA2436054C Selective direct and reverse circulation check valve mechanism for coiled tubing |
| 03/11/2008 | CA2427332C Flow controller with downhole pumping system |
| 03/06/2008 | WO2008005289A3 Method for improved well control with a downhole device |
| 03/06/2008 | WO2007131134A3 Multi-zone, single trip well completion system and methods of use |
| 03/06/2008 | US20080053662 Electrically operated well tools |
| 03/06/2008 | US20080053660 Actuation system for an oilfield tubular handling system |
| 03/06/2008 | CA2662020A1 Method and apparatus for selective down hole fluid communication |
| 03/05/2008 | EP1895092A1 Pulse generator |
| 03/05/2008 | EP1895091A1 Subsurface safety valve method and apparatus |
| 03/05/2008 | CN201031695Y Anti-theft enclosed sample valve |
| 03/05/2008 | CN201031663Y Down-hole measures switch |
| 03/05/2008 | CN201031662Y Down-hole controllable type boring tool by-pass valve |
| 03/05/2008 | CN201031661Y Hydraulic controlled under balance down-hole casing tube valve |
| 03/05/2008 | CN201031660Y Tools for forcedly opening under balance down-hole casing tube valve forced |
| 03/05/2008 | CN201031659Y Side direction type single flow valve |
| 03/05/2008 | CN201031658Y Backpressure valve for oilfield well head |
| 03/05/2008 | CN201031657Y Switch device under thick oil thermal recovery high-temperature high-pressure well |
| 03/05/2008 | CN201031656Y Small flow water injection regulation valve for oilfield |
| 03/05/2008 | CN201031650Y Pumping rod blowout preventer |
| 03/05/2008 | CN101135238A 井下放泻阀 Downhole valve discharge diarrhea |
| 03/04/2008 | US7337850 System and method for controlling actuation of tools in a wellbore |
| 03/04/2008 | US7337847 Multi-cycle downhole apparatus |
| 02/29/2008 | CA2599802A1 Downhole isolation valve and methods for use |
| 02/28/2008 | WO2008023203A1 Flow block |
| 02/28/2008 | US20080047717 Method and apparatus for stimulating hydrocarbon wells |
| 02/28/2008 | US20080047713 Method and apparatus for retaining a soft seal in an integrated flapper mount, hard seat, spring housing surface controlled subsurface safety valve |
| 02/27/2008 | EP1892372A1 Flow block |
| 02/27/2008 | EP1891297A2 Novel activating mechanism for controlling the operation of a downhole tool |
| 02/27/2008 | EP1891296A2 Packer with positionable collar |
| 02/27/2008 | EP1718841B1 Annular pressure relief collar |
| 02/27/2008 | CN201027530Y Separating oil riser bleeder |
| 02/27/2008 | CN201027529Y Automatic fill-up float collar of casing tube |
| 02/27/2008 | CN201027522Y Well head device for double-pipe thermal oil-extraction |
| 02/27/2008 | CN201027508Y Novel oil tube draining anchorage device |
| 02/27/2008 | CN201027501Y Blowout preventing kill-well joint of artesian well |
| 02/26/2008 | US7334650 Apparatus and methods for drilling a wellbore using casing |
| 02/26/2008 | CA2376211C Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 02/21/2008 | WO2008020759A1 Sealing device |
| 02/21/2008 | WO2007021422A3 Triple valve blow out preventer |
| 02/21/2008 | US20080041595 Fluid loss control system and method for controlling fluid loss |
| 02/21/2008 | DE102006027705B3 Drosselventil zur Fluidinjektion in geologische Formationen Throttle valve for fluid injection into geological formations |
| 02/21/2008 | CA2656827A1 Sealing device |
| 02/20/2008 | EP1888873A2 Method and apparatus for continuously injecting fluid in a wellbore while maintaining safety valve operation |
| 02/20/2008 | CN201025027Y Well mouth pressure measurement and oil sampling valve |