| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 08/29/2000 | US6109351 Failsafe control system for a subsurface safety valve |
| 08/23/2000 | EP1009907A4 Apparatus and method for determining integrity of oil well tubing |
| 08/17/2000 | WO2000047868A1 Completion equipment having a plurality of fluid paths for use in a well |
| 08/17/2000 | WO2000047864A1 Subsea completion apparatus |
| 08/17/2000 | CA2362810A1 Subsea completion apparatus |
| 08/15/2000 | US6102828 Electrohydraulic control unit |
| 08/15/2000 | US6102126 Pressure-actuated circulation valve |
| 08/10/2000 | WO2000046479A1 Multilateral well and electrical transmission system |
| 08/09/2000 | EP1025338A1 Production fluid control device for oil/gas wells |
| 08/09/2000 | EP0988439A4 Casing annulus remediation system |
| 08/09/2000 | CN2391005Y Antitheft bailing well head |
| 08/09/2000 | CN2391004Y Antitheft Christmas tree |
| 08/08/2000 | US6098714 Hydraulic fluid actuator with metal to metal seals |
| 08/03/2000 | WO2000045031A1 Controlling production |
| 08/03/2000 | WO2000045030A1 Valves for use in wells |
| 08/02/2000 | EP1024249A2 Downhole Tool |
| 08/02/2000 | EP1023524A2 Contamination-safe multi-dose dispensing and delivery system for flowable materials |
| 08/02/2000 | EP0820556B1 Cementing plug |
| 08/01/2000 | US6095250 Subsurface safety valve assembly for remedial deployment in a hydrocarbon production well |
| 08/01/2000 | US6095249 Down hole bypass valve |
| 08/01/2000 | US6095243 Washout arrangement for a well |
| 08/01/2000 | CA2002734C Subsea wellhead with annulus monitoring system |
| 07/27/2000 | WO2000043634A2 Method and apparatus for formation isolation in a well |
| 07/21/2000 | CA2297136A1 One-trip window milling apparatus & method with measurement-while-drilling |
| 07/20/2000 | WO2000041487A2 Pipe assembly with a plurality of outlets for use in a wellbore and method for running such a pipe assembly |
| 07/20/2000 | WO2000029707A3 Monitoring performance of downhole equipment |
| 07/19/2000 | EP1019611A1 Bypass valve for downhole motor |
| 07/18/2000 | US6089322 Method and apparatus for increasing fluid recovery from a subterranean formation |
| 07/12/2000 | EP1018593A1 Multi-valve fluid flow control system and method |
| 07/12/2000 | CN2387262Y Simple wellhead appts. |
| 07/12/2000 | CN2387261Y Gas mixing valve |
| 07/11/2000 | US6086650 Choke trim component; contains, in wt %, 2.5-4.5 (co+ni) with a weight ratio co/ni of about 3, 0.25-0.6 cr and 0.1 mo wherein essentially all of the wc grains have a size <1 mum |
| 07/11/2000 | US6085845 Surface controlled formation isolation valve adapted for deployment of a desired length of a tool string in a wellbore |
| 07/11/2000 | US6085843 Mechanical shut-off valve |
| 07/05/2000 | CN2386192Y Well tubing pump back throwing type valve |
| 07/05/2000 | CN2386191Y High-pressure plate sluice valve for oil production |
| 07/05/2000 | CA2293891A1 Multi-valve fluid flow control system and method |
| 07/04/2000 | US6082458 Flow control apparatus with specific latching means for use in a subterranean well and associated methods |
| 07/04/2000 | US6082454 Spooled coiled tubing strings for use in wellbores |
| 07/04/2000 | US6082452 Oil separation and pumping systems |
| 07/04/2000 | US6082451 Wellbore shoe joints and cementing systems |
| 06/27/2000 | US6079497 Pressure equalizing safety valve for subterranean wells |
| 06/27/2000 | US6079496 Reduced-shock landing collar |
| 06/22/2000 | WO2000009855A9 Hydraulic well control system |
| 06/21/2000 | EP1009907A1 Apparatus and method for determining integrity of oil well tubing |
| 06/21/2000 | CN2383972Y Once plugging tubular column for exploration and stopping water |
| 06/21/2000 | CN2383971Y Anti-stealing gas one-way valve for oil well head |
| 06/14/2000 | EP1008719A1 Method and apparatus for remote control of multilateral wells |
| 06/13/2000 | US6073698 Annulus pressure operated downhole choke and associated methods |
| 06/08/2000 | WO2000033492A1 Method and apparatus for remote actuation of a downhole device in a subsea well |
| 06/07/2000 | EP1006259A2 Downhole tool |
| 06/07/2000 | EP0900320A4 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 06/06/2000 | USRE36723 Spoolable coiled tubing completion system |
| 06/06/2000 | US6070672 Apparatus and method for downhole tool actuation |
| 06/06/2000 | US6070668 Blowout preventer spanner joint with emergency disconnect capability |
| 06/06/2000 | US6070608 Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 06/06/2000 | CA2141005C Wire cutting insert for gate valve |
| 06/02/2000 | WO2000031374A1 Apparatus and method for enhancing fluid and gas recovery in a well |
| 05/31/2000 | CN2380680Y Underground oil-draining device |
| 05/25/2000 | WO2000029715A1 Flow control and isolation in a wellbore |
| 05/25/2000 | WO2000029714A1 Method and apparatus for use with submersible electrical equipment |
| 05/25/2000 | WO2000029710A2 Wellbore flow control device |
| 05/25/2000 | WO2000029708A2 Method and apparatus for selective injection or flow control |
| 05/25/2000 | WO2000029707A2 Monitoring performance of downhole equipment |
| 05/25/2000 | CA2290897A1 Injection valve |
| 05/24/2000 | CN2379601Y Horizontal distribution type injection well top integrated valve |
| 05/23/2000 | US6065541 Cleaning device |
| 05/23/2000 | US6065535 Formation fracturing and gravel packing tool |
| 05/17/2000 | EP1000220A1 Bypass valve closing means |
| 05/17/2000 | CA2289978A1 Wellhead safety valve control system |
| 05/16/2000 | US6062073 In situ borehole sample analyzing probe and valved casing coupler therefor |
| 05/10/2000 | EP0999338A1 Remotely operable actuator for use in subterranean wells |
| 05/10/2000 | EP0998619A2 Variable choke for use in a subterranean well and method of controlling a fluid flow |
| 05/10/2000 | EP0938622A4 Method for accelerating production - c-i-p ii |
| 05/10/2000 | EP0795091B1 A mechanical overload protection device |
| 05/09/2000 | US6059042 Completions insertion and retrieval under pressure (CIRP) apparatus including the snaplock connector |
| 05/09/2000 | US6059041 Apparatus and methods for achieving lock-out of a downhole tool |
| 05/03/2000 | EP0996826A1 Hydraulic fluid actuator with metal to metal seals |
| 05/03/2000 | CN2376534Y Multi-function keeper head valve |
| 05/02/2000 | US6056055 Downhole lubricator for installation of extended assemblies |
| 04/26/2000 | EP0767862B1 Well completion lubricator valve |
| 04/25/2000 | US6053251 Reduced travel operating mechanism for downhole tools |
| 04/25/2000 | US6053250 Gravel pack apparatus |
| 04/25/2000 | US6053202 Fail-safe closure system for remotely operable valve actuator |
| 04/19/2000 | EP0858548B1 Inflow regulation device for a production pipe for production of oil or gas from an oil- and/or gas reservoir |
| 04/18/2000 | US6050338 Subsea wellhead apparatus |
| 04/13/2000 | WO2000020721A1 Hydraulic switch device |
| 04/13/2000 | WO2000000716A3 System and method for controlling fluid flows in oil or gas wells |
| 04/12/2000 | EP0992652A2 Circulating valve for use in wellbore |
| 04/12/2000 | EP0991887A1 Differential relief valve for flexible sea line |
| 04/12/2000 | EP0991847A1 Downhole surge pressure reduction system and method of use |
| 04/11/2000 | US6047773 Apparatus and methods for stimulating a subterranean well |
| 04/07/2000 | CA2285409A1 Multiple line hydraulic system flush valve |
| 04/06/2000 | WO2000019060A1 Tubular filling system |
| 04/04/2000 | US6046685 Redundant downhole production well control system and method |
| 04/04/2000 | US6044908 Sliding sleeve valve and seal ring for use therein |
| 04/04/2000 | US6044904 Wellhead assembly |
| 03/30/2000 | WO2000017483A1 Method and apparatus for relieving pressure |
| 03/30/2000 | WO2000017482A1 Eccentric subsurface safety valve |
| 03/29/2000 | EP0989284A2 Underbalanced well completion |