Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 34 - Valve arrangements for boreholes or wells
Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685)
10/1985
10/15/1985CA1195240A1 Separating collector for subsea blowouts
10/15/1985CA1195238A1 Low pressure responsive apr tester valve
10/15/1985CA1195237A1 Low pressure responsive apr tester valve
10/15/1985CA1195236A1 Circulation valve
10/08/1985CA1194780A1 Accelerated downhole pressure testing
10/01/1985CA1194408A1 Kelly cock rotary drive mechanism
09/1985
09/24/1985US4542792 Method and removable auxiliary apparatus for permanently locking open a well flow control device
09/24/1985US4542788 Downhole well tool
09/17/1985US4541484 Combination gravel packing device and method
09/17/1985US4541481 For use with a well tester
09/17/1985CA1193473A1 Well testing apparatus and method
09/10/1985US4540047 Flow controlling apparatus
09/10/1985US4540022 Choke for drilling or production use
09/03/1985US4538838 Method and apparatus of sealing threaded sections of a well tool
09/03/1985US4538685 Locking annulus safety valve
09/03/1985CA1192897A1 Auxiliary controlled valve disposed in a drilling string
09/03/1985CA1192838A1 Subsurface safety valve
09/03/1985CA1192836A1 Ball type shut in tool
08/1985
08/27/1985US4537383 Valve
08/27/1985US4537258 Low pressure responsive downhole tool
08/20/1985US4535968 Valve
08/20/1985CA1192128A1 Well flow control apparatus
08/15/1985WO1985003559A1 Full opening check valve
08/13/1985US4534715 For connection in a sump housing
08/13/1985US4534414 Hydraulic control fluid communication nipple
08/13/1985US4534096 Valve seat with trapped O-ring
08/07/1985EP0150643A2 Safety valve, in particular to close an oil-well
08/06/1985US4532952 Controller for well installations
08/06/1985CA1191448A1 Tool and method for gravel packing a well
07/1985
07/30/1985US4531587 Downhole flapper valve
07/30/1985US4531545 Drilling choke valve
07/23/1985US4530485 Valve
07/23/1985US4530377 Block valve
07/16/1985US4529038 Differential vent and bar actuated circulating valve and method
07/16/1985US4529035 Well completion
07/09/1985US4527631 Subsurface safety valve
07/09/1985US4527630 Hydraulic actuating means for subsurface safety valve
07/09/1985US4527629 Pressure differential circulating valve
07/09/1985CA1190144A1 Downhole lock system
07/01/1985EP0078261A4 Hydraulic control of subsea well equipment.
06/1985
06/25/1985US4524981 Annular seal with V-cut
06/25/1985US4524831 for controlling fluid flow between inside and outside of the conduit
06/25/1985US4524830 Landing nipple with subsurface safety valve
06/25/1985CA1189423A1 Choke for drilling or production use
06/19/1985EP0145537A2 Drill stem testing apparatus with multiple pressure sensing ports
06/18/1985US4523602 Pressure controller
06/18/1985CA1188981A1 Safety valve system with retrievable equalizing feature
06/11/1985US4522370 Valve
06/11/1985US4522266 Downhole tester valve with resilient seals
06/04/1985US4520870 Well flow control device
05/1985
05/28/1985US4519576 Oil well safety valve for use with drill pipe
05/28/1985US4519575 Valves and valve actuators
05/28/1985US4519574 Auxiliary controlled valve disposed in a drilling string
05/28/1985US4519457 Oil well standing valve
05/21/1985US4518148 For installation on a high pressure fluid well member to control flow
05/21/1985US4518036 Device for controlling a safety valve disposed below an activation pump in a hydrocarbon production well
05/21/1985CA1187406A1 Well pressure compensation for blowout preventers
05/21/1985CA1187405A1 Recloseable auxiliary valve
05/15/1985EP0141746A2 Annular electrical contact apparatus for use in drill stem testing
05/15/1985EP0140939A1 Drilling choke valve
05/15/1985EP0140938A1 Sub sea production choke and actuator
05/09/1985WO1985001999A1 Cylindrical gate valve apparatus and method
05/07/1985US4515219 Low pressure responsive downhole tool with floating shoe retarding means
05/07/1985US4515217 Perforating gun pressure activated sliding sleeve
05/07/1985CA1186618A1 Pressure controlled reversing valve
05/07/1985CA1186617A1 Cement staging apparatus for wells
05/07/1985CA1186527A1 Test system
04/1985
04/30/1985US4513944 Valve with latching means
04/30/1985US4513823 Cylindrical gate valve apparatus and method
04/30/1985US4513764 Valve
04/23/1985US4512398 Pump-out plug catcher
04/17/1985EP0137735A2 Annulus pressure responsive sampling apparatus
04/17/1985EP0063596B1 Device for temporarily sealing a pipe
04/16/1985US4510994 For use in a well tubing
04/09/1985US4509405 Control valve system for blowout preventers
04/03/1985EP0136146A2 Annulus pressure responsive downhole tool
04/02/1985US4508174 Downhole tool and method of using the same
04/02/1985US4508173 Flow control valve for use on oil and gas wells or the like
03/1985
03/20/1985EP0134734A1 Oil well logging method and apparatus
03/19/1985CA1184113A1 Deflate-equalizing valve apparatus for inflatable packer formation tester
03/12/1985US4503913 Hydraulically actuable well tool for use in subterranean wells
03/12/1985US4503879 Plug mechanism for wellhead tool
03/12/1985CA1183770A1 Annulus pressure controlled reversing valve
03/05/1985US4502542 Well system
03/05/1985US4502537 Apparatus for use in a testing string in a well
03/05/1985US4502536 Submersible pump
02/1985
02/26/1985US4501331 Method of completing a well
02/19/1985US4499951 Well completion apparatus
02/19/1985US4499919 Valve
02/05/1985US4497366 Packer actuated vent assembly
02/05/1985CA1182041A1 Well tool
01/1985
01/29/1985US4495998 Tubing pressure balanced well safety valve
01/22/1985US4494609 Test tree
01/22/1985US4494608 Well injection system
01/15/1985US4493373 Dynamic seal for well tools
01/15/1985CA1180999A1 Valve for subterranean wells
01/08/1985US4492362 Valve seat with trapped O-ring
01/08/1985CA1180692A1 Surface controlled blade stabilizer
01/01/1985US4491148 Automatic choke valve
12/1984
12/25/1984US4489786 Low pressure responsive downhole tool with differential pressure holding means
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