| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 10/10/1990 | EP0391874A2 Flushing means for drilling tools |
| 10/06/1990 | CA2062316A1 Eccentric drilling tool |
| 10/02/1990 | CA1274770A1 Well apparatus |
| 09/30/1990 | WO1990011429A2 Drill stem test tools |
| 09/27/1990 | DE4007907A1 Lenkvorrichtung fuer eine bohrerspitze in einem bohrloch Steering device for a drill tip in a borehole |
| 09/25/1990 | US4958689 Method of providing a high pressure surge of working fluid to an underground percussive mole |
| 09/25/1990 | CA1274469A1 Well test tool and system |
| 09/19/1990 | CN1045447A Sub-sea valve actuator |
| 09/18/1990 | US4957167 Retrievable fluid control valve with damping |
| 09/18/1990 | CA1274171A1 Apparatus for enhanced oil recovery |
| 09/13/1990 | CA2011972A1 Device for steering a drill bit |
| 09/12/1990 | EP0387205A2 Sub-sea valve assembly |
| 09/11/1990 | US4955949 Mud saver valve with increased flow check valve |
| 09/11/1990 | US4955195 Fluid control circuit and method of operating pressure responsive equipment |
| 09/11/1990 | CA1273868A1 Dual bore well treating tool |
| 09/04/1990 | US4953617 Apparatus for setting and retrieving a bridge plug from a subterranean well |
| 09/04/1990 | US4953616 Solenoid actuator and pulse drive |
| 08/29/1990 | CN2061235U Casing-pipe back-pressure valve for automatic grouting |
| 08/28/1990 | US4951760 Remote control actuation device |
| 08/28/1990 | US4951753 Subsurface well safety valve |
| 08/28/1990 | US4951752 Removing fluids from a wellbore |
| 08/28/1990 | CA1273288A1 Safety valve for an oil well, and tooling for operating said valve |
| 08/21/1990 | US4949788 Well completions using casing valves |
| 08/21/1990 | US4949784 Wellhead leak containment |
| 08/16/1990 | DE4003970A1 Ported member operation - uses tool concentrically insertable through prodn. tubing on continuous length of remedial tubing |
| 08/15/1990 | CA2009981A1 Valve |
| 08/14/1990 | CA1272683A1 Flapper type annulus pressure responsive tubing tester valve |
| 08/14/1990 | CA1272681A1 Low pressure responsive tester valve with ratchet |
| 08/07/1990 | US4945995 Process and device for hydraulically and selectively controlling at least two tools or instruments of a valve device allowing implementation of the method of using said device |
| 08/07/1990 | US4945993 For downhole use in a well |
| 07/31/1990 | US4944351 Downhole safety valve for subterranean well and method |
| 07/31/1990 | US4944350 Tool for closing a well tubing |
| 07/31/1990 | US4944349 Combination downhole tubing circulating valve and fluid unloader and method |
| 07/26/1990 | DE3906227C1 Device for taking samples from boreholes |
| 07/25/1990 | EP0379270A2 Hydraulic power system |
| 07/24/1990 | CA1271956A1 Rapid cycle annulus pressure responsive tester valve |
| 07/24/1990 | CA1271955A1 Low actuation pressure bar vent |
| 07/24/1990 | CA1271954A1 Tool for closing a well tubing |
| 07/18/1990 | CN2059454U Centralized valve at oil exploitating well for concentrated |
| 07/17/1990 | US4941535 Manual port closing tool for well cementing |
| 07/17/1990 | US4941534 Method and apparatus for sealing a casing in a subterranean well bore |
| 07/17/1990 | CA1271684A1 Apparatus and method for retarding mineral buildup in downhole pumps |
| 07/10/1990 | US4940094 Method and device to actuate specialized intervention equipment in a drilled well having at least one section highly slanted with respect to a vertical line |
| 07/10/1990 | US4940093 Gravel packing tool |
| 07/10/1990 | CA1271413A1 Well bore treating fluid tool |
| 07/10/1990 | CA1271409A1 Assembly for reducing the force applied to a slot and lug guide |
| 07/05/1990 | DE3900050A1 Method of cementing a pipe string and apparatus for carrying out the method |
| 07/04/1990 | EP0376930A1 Well tool with a removable sleeve valve |
| 07/04/1990 | EP0376585A2 Downhole surge valve for earth boring apparatus |
| 07/04/1990 | EP0376431A1 Annular port-closing tool and method for well cementing |
| 07/03/1990 | US4938060 Downhole inspection system |
| 07/03/1990 | CA1271133A1 Subsurface control valve |
| 07/03/1990 | CA1271132A1 Pressure operated circulating valve with releasable safety and method for operating the same |
| 07/03/1990 | CA1271131A1 Downhole tool with compressible liquid spring chamber |
| 06/30/1990 | CA2005522A1 Downhole surge valve for earth boring apparatus |
| 06/26/1990 | CA1270753A1 Full bore sample valve with time delay |
| 06/26/1990 | CA1270752A1 Hydrostatic referenced safety-circulating valve |
| 06/20/1990 | EP0373766A2 Subsea wellhead with annulus monitoring system |
| 06/19/1990 | US4934652 Dual stage valve actuator |
| 06/19/1990 | US4934460 Pressure compensating apparatus and method for chemical treatment of subterranean well bores |
| 06/13/1990 | EP0372594A2 Tool for treating subterranean wells |
| 06/12/1990 | CA1270190A1 Valve means having multiple seats for supporting and locating submersible pumps in deep wells |
| 06/12/1990 | CA1270189A1 Lost motion valve actuator |
| 06/05/1990 | CA1269924A1 Well tool having latching mechanism and method of utilizing the same |
| 05/30/1990 | EP0370652A2 Downhole well tool valve |
| 05/30/1990 | EP0370606A2 Downhole well fluid sampling tool |
| 05/29/1990 | US4928775 Downhole surge valve for earth boring apparatus |
| 05/29/1990 | US4928772 For introduction into a subterranean well |
| 05/29/1990 | US4928770 Mechanical manipulation tool with hydraulic hammer |
| 05/22/1990 | US4926945 Subsurface well safety valve with curved flapper and method of making |
| 05/22/1990 | US4926898 Safety choke valve |
| 05/16/1990 | EP0368437A2 Downhole tester valve and probe |
| 05/15/1990 | CA1269040A1 Injection control device for subterranean well conduit |
| 05/09/1990 | EP0367240A1 Adaptor for drilling strings with a controllable air passage |
| 05/08/1990 | US4923012 Safety valve for horizontal completions of subterranean wells |
| 05/08/1990 | US4923011 Drill stem mud wiping apparatus |
| 05/08/1990 | US4923010 Mud solids immune clean fluid compensating system |
| 05/08/1990 | US4923008 Hydraulic power system and method |
| 05/01/1990 | US4922423 Position and seal wear indicator for valves and blowout preventers |
| 05/01/1990 | US4921407 Production pump for high gravity or sand laden oil |
| 04/17/1990 | US4917191 Method and apparatus for selectively shifting a tool member |
| 04/10/1990 | US4915175 Well flow device |
| 04/10/1990 | US4915171 Above packer perforate test and sample tool and method of use |
| 04/10/1990 | US4915168 Multiple well tool control systems in a multi-valve well testing system |
| 04/05/1990 | WO1990003489A1 A valve assembly to co-operate with a readily removable valve actuator |
| 04/04/1990 | EP0361553A2 Gravel packing tool |
| 04/03/1990 | US4913231 Tool for treating subterranean wells |
| 03/27/1990 | US4911410 Shearing gate valve |
| 03/27/1990 | US4911242 Pressure-controlled well tester operated by one or more selected actuating pressures |
| 03/27/1990 | US4911199 For preventing excess flow through a tube |
| 03/27/1990 | CA1267076A1 Methods and apparatus for selectively controlling fluid communication between a pipe string and a well bore annulus |
| 03/20/1990 | US4909326 Tubing unloader |
| 03/20/1990 | US4909323 For a water well |
| 03/14/1990 | EP0358378A2 Valve control system for a well tester |
| 03/13/1990 | US4907953 Locking gas equalizer assembly |
| 03/13/1990 | US4907655 Pressure-controlled well tester operated by one or more selected actuating pressures |
| 03/13/1990 | US4907650 Wellhead with safety valve for pumping well |
| 03/08/1990 | DE3829678C1 Borehole plug |
| 03/06/1990 | US4905958 Blowout preventer |
| 02/28/1990 | CN2053665U Antifreezing and anti-thief recording valve for drawing hydraulic fluid sample in pipeline |