| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 10/21/1987 | EP0242239A1 Tool for closing a well's production column |
| 10/20/1987 | US4700924 For controlling fluid flow |
| 10/20/1987 | US4700783 Method and apparatus for recovering liquids from a well bore |
| 10/20/1987 | US4700782 Flow control valve for use in oil and gas wells and the like |
| 10/20/1987 | US4700777 Downhole tool |
| 10/20/1987 | CA1228289A1 Well cementing valve |
| 10/14/1987 | EP0241196A2 Annulus pressure responsive sampler valve |
| 10/13/1987 | US4699216 Blowout preventer for a side entry sub |
| 10/13/1987 | US4699178 Low volumetric expansion hose |
| 10/01/1987 | DE3607899A1 Actuator |
| 09/29/1987 | CA1227421A2 Valve |
| 09/29/1987 | CA1227417A1 Method and apparatus for oil well measurements |
| 09/23/1987 | EP0237662A1 Downhole tool |
| 09/22/1987 | US4694908 Method and apparatus of injecting fluid into a well conduit by coil tubing |
| 09/22/1987 | US4694903 Flapper type annulus pressure responsive tubing tester valve |
| 09/22/1987 | US4694855 Drill pipe inside blowout preventer |
| 09/15/1987 | US4693315 Bleedoff tool for well test system |
| 09/15/1987 | US4693314 Tubing vent |
| 09/08/1987 | US4691779 Hydrostatic referenced safety-circulating valve |
| 09/08/1987 | US4691778 Downhole water flow controller for aquifer storage recovery wells |
| 09/08/1987 | US4691777 Standing and injection valve |
| 09/08/1987 | US4691776 Retrievable well safety valve with expandable external seals |
| 09/08/1987 | US4691775 Isolation valve with frangible flapper element |
| 09/08/1987 | US4691735 Plunger valve apparatus for oil well pump |
| 08/26/1987 | EP0233750A2 Bar vent for downhole tool |
| 08/26/1987 | EP0233209A1 Drop ball sub-assembly for a down-hole device. |
| 08/25/1987 | US4688635 Apparatus for setting a bottom tool |
| 08/25/1987 | US4688593 Well reverse flow check valve |
| 08/19/1987 | EP0232335A1 Valve module, specially for undersea petroleum wells |
| 08/19/1987 | EP0232334A1 Valve module, specially for undersea petroleum wells |
| 08/19/1987 | EP0232333A1 Valve module, specially for undersea petroleum wells |
| 08/18/1987 | US4687179 Automatic valve actuator and control system |
| 08/18/1987 | US4687063 Well cementing method and apparatus |
| 08/18/1987 | US4687055 Wire-line controlled down-hole shut-in tool for wells |
| 08/12/1987 | EP0231694A1 Methods and apparatus for selectively controlling fluid communication between a pipe string and a well bore annulus |
| 08/11/1987 | US4685521 Well apparatus |
| 08/11/1987 | US4685520 Open hole pipe recovery circulation valve |
| 08/11/1987 | US4685517 For use in the pump barrel of a downhole pump |
| 08/11/1987 | CA1225326A1 Safety valve, in particular for closing an oil well |
| 08/04/1987 | US4683956 Method and apparatus for operating multiple tools in a well |
| 08/04/1987 | CA1225022A1 Submersible pump installation, methods and safety system |
| 08/04/1987 | CA1225016A1 Annular electrical contact apparatus for use in drill stem testing |
| 07/28/1987 | US4682656 Completion apparatus and method for gas lift production |
| 07/28/1987 | US4682655 Slotted housing having multiple seats for supporting and locating submersible pumps in deep wells |
| 07/22/1987 | EP0229706A2 Hydrostatic referenced safety-circulating valve |
| 07/21/1987 | US4681298 For use in remote locations, such as the sea floor |
| 07/21/1987 | US4681167 Apparatus and method for automatically and periodically introducing a fluid into a producing oil well |
| 07/21/1987 | US4681133 Rotatable ball valve apparatus and method |
| 07/14/1987 | US4679764 Automatic valve actuator and control system |
| 07/14/1987 | CA1224198A1 Valve seat with trapped o-ring |
| 07/07/1987 | US4678035 Methods and apparatus for subsurface testing of well bore fluids |
| 07/01/1987 | EP0227353A2 Annulus pressure responsive downhole tester valve |
| 06/30/1987 | US4676307 Pressure charged low spread safety valve |
| 06/30/1987 | US4676306 Pressure-controlled accumulator charging valve system for oil field downhole tools |
| 06/30/1987 | CA1223523A1 Valve |
| 06/30/1987 | CA1223522A1 Dynamic seal for well tools |
| 06/30/1987 | CA1223520A1 Safety valve apparatus and method |
| 06/24/1987 | EP0226455A2 Subsurface control valve |
| 06/23/1987 | US4674959 Pressure-operated valve, particularly for a downhole pump |
| 06/23/1987 | US4674575 Sealing system for downhole well valves |
| 06/23/1987 | US4674569 Stage cementing tool |
| 06/16/1987 | EP0225815A1 Tool for closing the production string of a well |
| 06/10/1987 | EP0224942A1 Stage cementing apparatus |
| 06/09/1987 | US4671358 Wiper plug cementing system and method of use thereof |
| 06/09/1987 | US4671352 Apparatus for selectively injecting treating fluids into earth formations |
| 06/09/1987 | US4671312 Wireline cutting actuator and valve |
| 06/04/1987 | DE3541826A1 Annulus valve, in particular for natural-gas and oil wells |
| 06/02/1987 | US4669547 High temperature subsurface safety valve |
| 06/02/1987 | US4669541 Stage cementing apparatus |
| 06/02/1987 | US4669537 Well test tool and system |
| 06/02/1987 | CA1222446A1 Subsurface well safety valve and control system |
| 05/27/1987 | EP0223553A2 Pressure operated downhole tool with releasable safety device |
| 05/27/1987 | EP0223552A2 Downhole circulation valve and method for operating the same |
| 05/26/1987 | US4667743 Low pressure responsive tester valve with ratchet |
| 05/26/1987 | US4667736 Surface controlled subsurface safety valve |
| 05/20/1987 | EP0222620A2 Assembly for reducing the force applied to a slot and lug guide |
| 05/19/1987 | US4665991 Downhole tool with gas energized compressible liquid spring |
| 05/19/1987 | US4665983 Full bore sampler valve with time delay |
| 05/13/1987 | EP0221713A2 Downhole tool with compressible liquid spring chamber |
| 05/13/1987 | EP0221053A1 Oil well safety valve for use with drill pipe |
| 05/12/1987 | US4664196 Downhole tool with compressible liquid spring chamber |
| 05/12/1987 | US4664195 For installation within a well flow conductor |
| 05/05/1987 | US4662603 Piloted wellhead flow control valve |
| 05/05/1987 | US4662452 Injection control device for subterranean well conduit |
| 04/28/1987 | US4660647 Fluid control line switching methods and apparatus |
| 04/28/1987 | US4660646 Failsafe gas closed safety valve |
| 04/28/1987 | US4660635 Equipment for a pipe string such as a drill-pipe string, comprising a side entry connection for passing a cable |
| 04/28/1987 | US4660596 Inside B.O.P. valve |
| 04/21/1987 | US4658904 Subsea master valve for use in well testing |
| 04/21/1987 | US4658902 Surging fluids downhole in an earth borehole |
| 04/21/1987 | CA1220779A1 Single acting hydraulic fishing jar |
| 04/14/1987 | US4657092 Circulation reversing tool |
| 04/14/1987 | US4657083 Pressure operated circulating valve with releasable safety and method for operating the same |
| 04/14/1987 | US4657082 Circulation valve and method for operating the same |
| 04/08/1987 | EP0216970A1 Valves |
| 04/07/1987 | USRE32390 Hydraulic actuating means for subsurface safety valve |
| 04/07/1987 | US4655289 Remote control selector valve |
| 04/07/1987 | US4655288 Lost-motion valve actuator |
| 04/07/1987 | US4655285 Plug for use in hot oil treatment of wells having paraffin deposits and method of use thereof |
| 04/01/1987 | EP0216554A2 Well tool valve with hydraulic latch |