| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 04/01/2003 | US6540022 Method and apparatus for frac/gravel packs |
| 04/01/2003 | CA2228415C One-trip well perforation/proppant fracturing apparatus and methods |
| 03/27/2003 | WO2003025338A1 Shut-off device |
| 03/27/2003 | US20030056955 Chemical injection control system and method for multiple wells |
| 03/27/2003 | US20030056951 Sliding sleeve valve |
| 03/26/2003 | CN1406311A Choke inductor for wireless communication and control in a well |
| 03/25/2003 | US6536530 Hydraulic control system for downhole tools |
| 03/25/2003 | US6536529 Communicating commands to a well tool |
| 03/25/2003 | US6536524 Method and system for performing a casing conveyed perforating process and other operations in wells |
| 03/25/2003 | US6536473 Choke valve |
| 03/20/2003 | WO2003023185A1 Adjustable well screen assembly |
| 03/20/2003 | US20030051881 Electro-hydraulically pressurized downhole valve actuator |
| 03/20/2003 | US20030051880 Method and apparatus for drilling a plurality of offshore underwater wells |
| 03/19/2003 | EP1293641A1 Apparatus for setting a sidetrack plug in a well bore |
| 03/18/2003 | US6533037 Flow-operated valve |
| 03/13/2003 | WO2003001019A3 Sleeve valve and method for providing a controllable fluid flow |
| 03/13/2003 | US20030048697 Power generation using batteries with reconfigurable discharge |
| 03/13/2003 | US20030048197 Sequential hydraulic control system for use in a subterranean well |
| 03/13/2003 | US20030047702 Sleeve valve and method for its assembly |
| 03/13/2003 | US20030047622 Cavitating jet |
| 03/13/2003 | US20030047317 Deep-set subsurface safety valve assembly |
| 03/13/2003 | US20030047308 Wireless downwhole measurement and control for optimizing gas lift well and field performance |
| 03/13/2003 | US20030047223 Single pilot dual pulse spool valve |
| 03/12/2003 | EP1290311A1 Sequential hydraulic control system for use in subterranean well |
| 03/12/2003 | CN1402810A Production valve |
| 03/06/2003 | WO2003018955A1 Downhole actuation system utilizing electroactive fluids |
| 03/06/2003 | US20030042025 Light-intervention subsea tree system |
| 03/05/2003 | EP1287225A2 Port collar assembly for use in a wellbore |
| 03/05/2003 | CN2538953Y Oil well oil-pumping aid |
| 03/05/2003 | CN2538952Y Multifunctional beam-pumping unit well christmas tree |
| 03/04/2003 | US6527050 Method and apparatus for formation damage removal |
| 03/04/2003 | US6527010 Single pilot dual pulse spool valve |
| 02/27/2003 | US20030037926 Method and apparatus for formation damage removal |
| 02/27/2003 | US20030037544 Subsea actuator assemblies and methods for extending the water depth capabilities of subsea actuator assemblies |
| 02/26/2003 | CN2537810Y Full path measurer |
| 02/25/2003 | US6523614 Subsurface safety valve lock out and communication tool and method for use of the same |
| 02/25/2003 | US6523613 Hydraulically actuated valve |
| 02/25/2003 | CA2190932C Bidirectional disappearing plug |
| 02/20/2003 | WO2003014608A1 Valve system and method |
| 02/20/2003 | WO2003014604A2 Method and apparatus for replacing bop with gate valve |
| 02/20/2003 | US20030034158 Wellbore pump |
| 02/19/2003 | EP1283940A1 Hydraulically operated fluid metering apparatus for use in a subterranean well |
| 02/19/2003 | CN2536782Y Block style oil drainage device |
| 02/19/2003 | CN2536781Y Non-disassemble wellhead for oil production by gas injection |
| 02/18/2003 | US6520257 Method and apparatus for surge reduction |
| 02/18/2003 | US6520256 Method and apparatus for cementing an air drilled well |
| 02/18/2003 | US6520207 Combination poppet and gate valve |
| 02/17/2003 | CA2355500A1 Wellbore pump |
| 02/13/2003 | WO2002044508A3 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium |
| 02/13/2003 | US20030030017 Valve system and method |
| 02/13/2003 | US20030029619 Method and apparatus for replacing BOP with gate valve |
| 02/13/2003 | US20030029611 System and method for actuating a subterranean valve to terminate a reverse cementing operation |
| 02/12/2003 | EP1282794A2 Combination poppet and gate valve |
| 02/12/2003 | EP1282757A1 Subsea riser disconnect and method |
| 02/12/2003 | CN2535551Y Controllable pump-packing device of pumping-oil well |
| 02/12/2003 | CN2535550Y Leakage-oil guiding grinding powder |
| 02/11/2003 | US6516890 Apparatus and method for preventing the inadvertent activation of the actuating mechanism of a well tool |
| 02/11/2003 | US6516888 Device and method for regulating fluid flow in a well |
| 02/11/2003 | US6516886 Well isolation system |
| 02/06/2003 | WO2003010412A2 Sand control seal for subsurface safety valve |
| 02/06/2003 | US20030025094 Small bore gate valve |
| 02/06/2003 | US20030024712 Bridge plug |
| 02/06/2003 | US20030024708 Structral support |
| 02/06/2003 | US20030024706 Downhole surge reduction method and apparatus |
| 02/06/2003 | US20030024704 Use of downhole high pressure gas in a gas-lift well |
| 02/06/2003 | US20030024580 Choke valve |
| 02/05/2003 | CN2534365Y Antitheft eccentric chritsmas tree |
| 02/05/2003 | CN2534361Y Oil field wallhead adulterating water process assembling apparatus |
| 02/04/2003 | US6513595 Port collar assembly for use in a wellbore |
| 02/04/2003 | US6513594 Subsurface safety valve |
| 02/04/2003 | US6513589 Hydraulic switch device |
| 02/02/2003 | CA2395723A1 Improved bridge plug |
| 01/31/2003 | WO2002021072A2 Displacement measurement with a spring and force measurement for actuators, blow-out preventers, valves |
| 01/31/2003 | CA2418099A1 Displacement measurement with a spring and force measurement for actuators, blow-out preventers, valves |
| 01/30/2003 | US20030019634 Upper zone isolation tool for smart well completions |
| 01/30/2003 | US20030019632 Production tree with multiple safety barriers |
| 01/30/2003 | US20030019630 Port Collar assembly for use in a wellbore |
| 01/30/2003 | US20030019629 Sand control seal for subsurface safety valve |
| 01/30/2003 | US20030019628 Bottom hole assembly |
| 01/30/2003 | US20030019622 Downhole actuation system utilizing electroactive fluids |
| 01/29/2003 | EP1279795A1 Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 01/29/2003 | EP1278936A1 Tubing hanger with annulus bore |
| 01/29/2003 | EP1278935A1 Tubing head seal assembly |
| 01/29/2003 | EP1278934A1 Tubing hanger system with gate valve |
| 01/29/2003 | EP1278933A1 Internal gate valve for flow completion systems |
| 01/29/2003 | CN2533258Y Multifunctional blowout preventer |
| 01/28/2003 | CA2051027C Oilfield cementing tool |
| 01/23/2003 | WO2003006787A1 Liner brushing and conditioning tool |
| 01/23/2003 | WO2002052124A3 Method and apparatus for repair operations downhole |
| 01/23/2003 | US20030015323 Circulation control device |
| 01/22/2003 | EP1276955A1 Central circulation completion system |
| 01/22/2003 | CN2532235Y Long neck straight through piston type sleeve pressure taking device |
| 01/22/2003 | CN2532234Y Straight through piston valve |
| 01/21/2003 | US6508309 Valve assembly |
| 01/16/2003 | WO2003004913A1 Small bore gate valve |
| 01/15/2003 | EP1274992A1 Apparatus and method for downhole well equipment and process management, identification, and actuation |
| 01/15/2003 | CN2531105Y Support-type bleeder |
| 01/15/2003 | CN2531104Y Check valve |
| 01/15/2003 | CN2531103Y Composite cased gas wellhead reclaimer |
| 01/14/2003 | US6505684 Hydraulic actuator |