| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 01/16/2001 | US6173772 Controlling multiple downhole tools |
| 01/16/2001 | US6173768 Method and apparatus for downhole oil/water separation during oil well pumping operations |
| 01/11/2001 | WO2001002697A1 Apparatus and method for controlling fluid flow |
| 01/10/2001 | CN1279337A Bidirectionally normal opened spherical uniflow valve able to discharge sand |
| 01/04/2001 | WO2000053887A3 Wellbore primary barrier and related systems |
| 01/03/2001 | EP1064451A1 Pressure actuated downhole tool |
| 01/03/2001 | CN2413022Y Double-action single-flow valve |
| 01/03/2001 | CN2413021Y Drilling tool single-flow valve |
| 01/03/2001 | CN2413020Y Downhold control valve for well pumping unit |
| 01/02/2001 | US6167974 Method of underbalanced drilling |
| 12/28/2000 | WO2000079094A1 Variable downhole choke |
| 12/27/2000 | EP1062405A1 Extraction of fluids from wells |
| 12/27/2000 | EP0991847A4 Downhole surge pressure reduction system and method of use |
| 12/20/2000 | EP1060320A1 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 12/19/2000 | US6161632 Purging means for purging upwards in ring spacing between drill pipe and bore hole wall |
| 12/19/2000 | CA2191955C Ball and seat valve assembly and downhole pump utilizing said valve assembly |
| 12/14/2000 | WO2000075484A1 Apparatus and method for controlling fluid flow in a wellbore |
| 12/14/2000 | WO2000075483A1 Actuator |
| 12/14/2000 | WO2000075482A1 Sliding sleeve assembly for subsurface flow control |
| 12/14/2000 | CA2371429A1 Sliding sleeve assembly for subsurface flow control |
| 12/12/2000 | US6158714 Adjustable orifice valve |
| 12/12/2000 | CA2017324C Apparatus for testing an oil well, and corresponding method |
| 12/07/2000 | WO2000073618A1 System and method for actuating a remote device |
| 12/07/2000 | WO2000033492A9 Method and apparatus for remote actuation of a downhole device in a subsea well |
| 12/07/2000 | CA2310878A1 Lubrication and self-cleaning system for expansion mandrel |
| 12/05/2000 | US6155350 Ball seat with controlled releasing pressure and method setting a downhole tool ball seat with controlled releasing pressure and method setting a downholed tool |
| 11/30/2000 | WO2000043634A3 Method and apparatus for formation isolation in a well |
| 11/29/2000 | EP1055797A2 Drill string diverter apparatus and method |
| 11/29/2000 | CN1274796A Centralizer |
| 11/28/2000 | US6152232 Underbalanced well completion |
| 11/28/2000 | US6152229 Subsea dual in-line ball valves |
| 11/28/2000 | US6152228 Apparatus and method for circulating fluid in a borehole |
| 11/28/2000 | US6152224 Downhole apparatus |
| 11/28/2000 | US6152170 Differential relief valve for flexible sea line |
| 11/23/2000 | WO2000070185A1 Recovery of production fluids from an oil or gas well |
| 11/23/2000 | WO2000029710A3 Wellbore flow control device |
| 11/22/2000 | CN1274329A Contamination-safe multi-dose dispensing and delivery system for flowable materials |
| 11/21/2000 | US6148920 Equalizing subsurface safety valve with injection system |
| 11/21/2000 | US6148919 Apparatus having a releasable lock |
| 11/21/2000 | US6148915 Apparatus and methods for completing a subterranean well |
| 11/21/2000 | US6148843 Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 11/16/2000 | WO2000029708A3 Method and apparatus for selective injection or flow control |
| 11/15/2000 | CN2406061Y Heated-washing non-return valve for oil-well fitted sound-wave apparatus |
| 11/14/2000 | US6145595 Annulus pressure referenced circulating valve |
| 11/14/2000 | US6145594 Gate valve for subsea completion system |
| 11/14/2000 | US6145593 Main bore isolation assembly for multi-lateral use |
| 11/09/2000 | WO2000066880A1 Downhole device for controlling fluid flow in a well |
| 11/09/2000 | WO2000066879A1 Method and multi-purpose apparatus for control of fluid in wellbore casing |
| 11/07/2000 | US6142237 Method for coupling and release of submergible equipment |
| 11/07/2000 | US6142226 Hydraulic setting tool |
| 11/07/2000 | CA2062131C Handle enclosure for valves |
| 11/02/2000 | WO2000041487A3 Pipe assembly with a plurality of outlets for use in a wellbore and method for running such a pipe assembly |
| 10/31/2000 | US6138774 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 10/31/2000 | US6138758 Method and apparatus for downhole hydro-carbon separation |
| 10/31/2000 | US6138754 Method and apparatus for use with submersible electrical equipment |
| 10/29/2000 | CA2270503A1 Method of completing and producing hydrocarbons in a well |
| 10/26/2000 | WO2000063526A1 Apparatus for remote control of wellbore fluid flow |
| 10/26/2000 | WO2000063520A1 Packer |
| 10/25/2000 | CN2402799Y Reusing oil drain valve device |
| 10/25/2000 | CN1057813C Horizontal tree safety valve and method for using the same |
| 10/17/2000 | US6131663 Method and apparatus for positioning and repositioning a plurality of service tools downhole without rotation |
| 10/11/2000 | EP1042585A1 Method and apparatus for cementing casing in a wellbore |
| 10/11/2000 | EP0840836B1 System for controlling production from a gaz-lifted oil well |
| 10/11/2000 | CN2400572Y Floater-type downhole switch |
| 10/04/2000 | CN1268993A Apparatus and method for determinating integrity of oil well tubing |
| 10/03/2000 | US6125938 Control module system for subterranean well |
| 10/03/2000 | US6125937 Methods of completing a subterranean well and associated apparatus |
| 10/03/2000 | US6125933 Formation fracturing and gravel packing tool |
| 10/03/2000 | US6125930 Downhole valve |
| 10/03/2000 | US6125928 System for controlling and stopping oil drilling fires |
| 09/26/2000 | USRE36880 Spoolable flexible hydraulic controlled coiled tubing safety valve |
| 09/26/2000 | US6123151 Valve for use in a subsea drilling riser |
| 09/20/2000 | CN2397255Y Fixed valve for oil-well pump |
| 09/19/2000 | US6119783 Linear indexing apparatus and methods of using same |
| 09/19/2000 | US6119781 Method of operating an oil and gas production well activated by a pumping system |
| 09/19/2000 | US6119773 Well production system with a hydraulically operated safety valve |
| 09/19/2000 | CA2138946C Pressure relief valve |
| 09/14/2000 | WO2000053890A1 A downhole actuator including a sealing bellows |
| 09/14/2000 | WO2000053889A1 Flow rate control device with protection for sealing gaskets |
| 09/14/2000 | WO2000053888A1 Downhole flow rate controle device |
| 09/14/2000 | WO2000053887A2 Wellbore primary barrier and related systems |
| 09/14/2000 | WO2000053885A2 Downhole apparatus |
| 09/14/2000 | CA2365331A1 Downhole apparatus |
| 09/12/2000 | US6116343 One-trip well perforation/proppant fracturing apparatus and methods |
| 09/12/2000 | US6116336 Wellbore mill system |
| 09/12/2000 | US6116270 Piston valve |
| 09/12/2000 | US6116268 Wellhead safety valve control system |
| 09/12/2000 | CA2143349C Flow control sub for hydraulic expanding downhole tools |
| 09/08/2000 | WO2000052370A1 Valve arrangement for controlling hydraulic fluid flow to a subsea system |
| 09/08/2000 | WO2000052300A1 Rotating blowout preventer |
| 09/06/2000 | EP0895561B1 Method and apparatus for remote control of multilateral wells |
| 09/05/2000 | US6112817 Flow control apparatus and methods |
| 09/05/2000 | US6112816 Single-phase annulus-operated sliding sleeve |
| 09/05/2000 | US6112815 Inflow regulation device for a production pipe for production of oil or gas from an oil and/or gas reservoir |
| 08/30/2000 | CN2393999Y Multifunctional underwell valve |
| 08/29/2000 | US6109357 Control line actuation of multiple downhole components |
| 08/29/2000 | US6109356 Well completion tool having pressure relief capability incorporated therein and associated method |
| 08/29/2000 | US6109354 Circulating valve responsive to fluid flow rate therethrough and associated methods of servicing a well |
| 08/29/2000 | US6109353 Single bore riser system |
| 08/29/2000 | US6109352 Simplified Xmas tree using sub-sea test tree |