| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 12/11/1984 | US4487263 Cement staging apparatus for wells and including well casing and a process therefor |
| 12/11/1984 | US4487221 Device for temporarily sealing a pipe |
| 12/11/1984 | CA1179256A1 Well apparatus |
| 12/04/1984 | US4485876 Method of controlling fluid pressure |
| 11/27/1984 | CA1178531A1 Pressure actuated vent assembly for slanted wellbores |
| 11/14/1984 | EP0124601A1 Safety valve apparatus and method |
| 11/13/1984 | US4481973 Differential pressure energized circulating valve |
| 11/06/1984 | US4480813 Kelly cock rotary drive mechanism |
| 11/06/1984 | US4480697 Method and apparatus for converting an oil well to a well with effluent raising by gas-lift |
| 11/06/1984 | US4480690 Accelerated downhole pressure testing |
| 11/06/1984 | US4480687 Side pocket mandrel system for dual chemical injection |
| 10/31/1984 | EP0123393A2 Ball type shut in tool for wells |
| 10/30/1984 | US4479545 Well-cementing stage collar |
| 10/30/1984 | US4479539 Downhole lock system |
| 10/23/1984 | US4478288 Apparatus with annulus safety valve for through tubing injection and method of use |
| 10/23/1984 | US4478286 Equalizing valve for subterranean wells |
| 10/23/1984 | US4478279 Retrievable inside blowout preventer valve apparatus |
| 10/16/1984 | US4476935 Safety valve apparatus and method |
| 10/16/1984 | US4476934 Retractable stinger purge valve |
| 10/16/1984 | US4476933 Lubricator valve apparatus |
| 10/16/1984 | CA1176227A1 High pressure valve |
| 10/16/1984 | CA1176155A1 Valve means |
| 10/11/1984 | WO1984003924A1 Drilling choke valve |
| 10/11/1984 | WO1984003922A1 Sub sea production choke and actuator |
| 10/10/1984 | EP0121329A2 Downhole well tool |
| 10/09/1984 | US4475599 Valve for subterranean wells |
| 10/09/1984 | US4475598 Ball valve actuating mechanism |
| 10/02/1984 | US4474242 Annulus pressure controlled reversing valve |
| 10/02/1984 | US4474241 Differential fill valve assembly |
| 10/02/1984 | US4474234 Safety valve installed below an activation pump in a hydrocarbon production well |
| 09/25/1984 | US4473122 For controlling fluid flow through a first flow conductor |
| 09/25/1984 | US4473121 Pressure regulating and relief valve assembly |
| 09/19/1984 | EP0118994A1 Cementing tool for wells |
| 09/18/1984 | US4471841 Pressure balanced valve |
| 09/11/1984 | US4470469 Swivel head for drilling and mining tool |
| 09/11/1984 | US4470465 Ball type shut in tool |
| 09/11/1984 | US4470464 For installation in a well bore |
| 09/11/1984 | US4470430 Drilling choke |
| 09/04/1984 | US4469180 Well fluid pressure balanced operator for subsurface safety valve |
| 09/04/1984 | US4469179 Safety system |
| 09/04/1984 | US4469174 Combination cementing shoe and basket |
| 08/28/1984 | US4467870 For controlling flow in a fluid transmission conduit |
| 08/28/1984 | US4467867 Subterranean well safety valve with reference pressure chamber |
| 08/28/1984 | US4467866 Flow controlling apparatus |
| 08/28/1984 | US4467825 Shuttle valve assembly |
| 08/14/1984 | US4465139 Valve and sensing device for well conduits |
| 08/07/1984 | CA1172161A1 Method and apparatus for completing a well |
| 07/24/1984 | US4461354 Hydraulic well cap |
| 07/24/1984 | US4461353 For a well completion utilizing a submersible pump |
| 07/24/1984 | US4461316 For use in severe operating conditions during earth drilling operations |
| 07/24/1984 | CA1171352A1 Full-bore well tester with hydrostatic bias |
| 07/17/1984 | US4460046 Control fluid communication nipple |
| 07/17/1984 | US4460040 For controlling the flow around a seal element |
| 07/17/1984 | US4460039 Wellhead valve removal and installation tool |
| 07/17/1984 | CA1170982A1 Well valve |
| 07/17/1984 | CA1170981A1 Drill string safety valve |
| 07/10/1984 | US4458903 Control line sealing connection |
| 07/10/1984 | US4458762 For use in a testing string in a well bore |
| 07/10/1984 | US4458751 Method and apparatus for selective disengagement of a fluid transmission conduit operable under oppositely directed pressure differentials |
| 07/03/1984 | US4457379 Method and apparatus for opening downhole flapper valves |
| 07/03/1984 | US4457377 For use in cementing operations in wells |
| 07/03/1984 | US4457376 Flapper type safety valve for subterranean wells |
| 06/26/1984 | US4456217 Kelly valving apparatus |
| 06/26/1984 | CA1169758A1 Cement retainer and setting tool assembly |
| 06/19/1984 | US4454913 Safety valve system with retrievable equalizing feature |
| 06/19/1984 | CA1169355A1 Flow control apparatus for wells |
| 06/19/1984 | CA1169354A1 High pressure choke assembly |
| 06/13/1984 | EP0110803A1 Single acting hydraulic fishing jar |
| 06/12/1984 | US4453599 Method and apparatus for controlling a well |
| 06/05/1984 | US4452313 Circulation valve |
| 06/05/1984 | US4452311 Equalizing means for well tools |
| 06/05/1984 | US4452310 Metal-to-metal high/low pressure seal |
| 06/05/1984 | US4452304 Remotely operated packer and anchor apparatus for changing a geothermal wellhead valve |
| 06/05/1984 | CA1168576A1 Apparatus and method for controlling injection fluid flow in a well annulus |
| 05/29/1984 | US4450914 Well treatment valve |
| 05/22/1984 | US4449587 Surface controlled subsurface safety valves |
| 05/22/1984 | US4449583 Well devices with annulus check valve and hydraulic by-pass |
| 05/15/1984 | US4448427 Piston-expanded metallic seal for side door well valve |
| 05/15/1984 | US4448254 Tester valve with silicone liquid spring |
| 05/15/1984 | US4448247 Geothermal well head clean out and shut off assembly |
| 05/15/1984 | US4448216 Subsurface safety valve |
| 05/10/1984 | WO1984001799A1 Safety valve apparatus and method |
| 05/09/1984 | EP0108044A2 Cooling water flow regulating apparatus for coal gasification wells |
| 05/08/1984 | US4446922 Adjustable safety valve |
| 05/01/1984 | US4445571 Circulation valve |
| 04/26/1984 | WO1984001600A1 Retrievable inside blowout preventer valve apparatus |
| 04/24/1984 | US4444268 Tester valve with silicone liquid spring |
| 04/24/1984 | US4444267 Well testing apparatus |
| 04/24/1984 | US4444266 Deep set piston actuated well safety valve |
| 04/24/1984 | US4444251 Combined installation comprising an activation pump and a safety valve disposed below this pump, in a hydrocarbon production well |
| 04/24/1984 | CA1166152A1 Subsurface safety valve system with hydraulic packer |
| 04/10/1984 | US4441558 Valve |
| 04/10/1984 | CA1165231A1 Well tool |
| 04/10/1984 | CA1165230A1 Test tree |
| 04/10/1984 | CA1165227A1 Well tool |
| 04/10/1984 | CA1165226A1 Well system |
| 04/03/1984 | US4440232 Well pressure compensation for blowout preventers |
| 04/03/1984 | US4440231 Downhole pump with safety valve |
| 04/03/1984 | US4440230 Full-bore well tester with hydrostatic bias |
| 04/03/1984 | US4440221 Submergible pump installation |