| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 08/05/1986 | US4603740 Subsurface safety valve |
| 07/29/1986 | US4602684 Well cementing valve |
| 07/29/1986 | CA1208542A1 Flow control valve for use on oil and gas wells or the like |
| 07/22/1986 | US4601610 Apparatus and method for underwater valve component assembly and disassembly |
| 07/22/1986 | US4601342 For use in a well conduit |
| 07/22/1986 | US4601341 Flexible piston well safety valve |
| 07/16/1986 | EP0187690A2 Downhole tool with liquid spring |
| 07/09/1986 | EP0187097A2 Bottom hole sampler and safety valve |
| 07/08/1986 | US4598773 Fail-safe well safety valve and method |
| 07/02/1986 | CA1206870A Valve |
| 07/01/1986 | US4597449 Method and apparatus for preventing fluid runovers from a well |
| 07/01/1986 | US4597446 Safety valves for wells |
| 07/01/1986 | US4597445 Well subsurface safety valve |
| 07/01/1986 | US4597439 Full-bore sample-collecting apparatus |
| 06/24/1986 | US4596516 Gas lift apparatus having condition responsive gas inlet valve |
| 06/17/1986 | US4595061 Deep well pipe water release valve |
| 06/17/1986 | US4595060 Downhole tool with compressible well fluid chamber |
| 06/11/1986 | EP0184013A2 Method for the measurement of hydrostatic and gas pressure in a sealed bore hole |
| 06/05/1986 | WO1986003254A1 Non-return valve for bore hole sleeves |
| 06/04/1986 | EP0183482A2 Downhole tool |
| 05/27/1986 | US4590998 Tubing valve |
| 05/27/1986 | CA1205010A1 Cylindrical gate valve apparatus and method |
| 05/20/1986 | US4589495 Apparatus and method for inserting flow control means into a well casing |
| 05/20/1986 | US4589493 Subsea wellhead production apparatus with a retrievable subsea choke |
| 05/20/1986 | US4589485 Downhole tool utilizing well fluid compression |
| 05/20/1986 | US4589482 Well production system |
| 05/13/1986 | CA1204383A1 Well tool |
| 05/06/1986 | US4586569 Retrievable fluid control valve |
| 04/29/1986 | US4585067 Method and apparatus for stopping well production |
| 04/29/1986 | US4585025 Mounting for a valve actuator |
| 04/22/1986 | US4583596 For controlling the fluid flow through a well conduit |
| 04/22/1986 | US4583592 Well test apparatus and methods |
| 04/22/1986 | US4583570 Flow control assembly |
| 04/22/1986 | CA1203472A1 Full bore sampler valve apparatus |
| 04/15/1986 | US4582140 Well tool with selective bypass functions |
| 04/15/1986 | CA1203222A1 Valves and valve actuators |
| 04/15/1986 | CA1203161A1 Retrievable inside blowout preventer valve apparatus |
| 04/08/1986 | US4580761 Electric valve device having a rotatable core |
| 04/08/1986 | CA1202879A1 Downhole tool and method using the same |
| 04/01/1986 | US4579177 Subsurface solenoid latched safety valve |
| 04/01/1986 | US4579174 Well tool with hydraulic time delay |
| 03/26/1986 | EP0175553A2 Well tool with selective bypass functions |
| 03/25/1986 | US4577702 Method of preventing drill string overflow |
| 03/25/1986 | US4577694 In a well conduit in an open position |
| 03/25/1986 | US4577692 Pressure operated test valve |
| 03/25/1986 | US4577662 Plug valve equipped with pressure equalization means |
| 03/25/1986 | US4577614 Blowout preventor apparatus |
| 03/19/1986 | EP0174857A2 Well tool with improved valve support structure |
| 03/18/1986 | US4576235 Downhole relief valve |
| 03/18/1986 | US4576234 Full bore sampler valve |
| 03/18/1986 | US4576233 Method of backsurging a well |
| 03/18/1986 | US4576196 Fluid pressure responsive valving apparatus for downhole tools |
| 03/18/1986 | US4576193 Device for working on a submerged valve |
| 03/11/1986 | US4574894 Ball actuable circulating dump valve |
| 03/11/1986 | US4574889 Method and apparatus for locking a subsurface safety valve in the open position |
| 03/11/1986 | CA1201653A1 Drilling choke valve |
| 03/04/1986 | US4573536 Method and apparatus for flushing a well |
| 03/04/1986 | US4573535 Valve for use in a well testing string located in a wellbore |
| 02/25/1986 | US4572298 Gate valve apparatus and method |
| 02/18/1986 | CA1200758A1 Valve |
| 02/11/1986 | US4569398 Subsurface well safety valve |
| 02/11/1986 | US4569397 Ball valve actuating mechanism |
| 02/04/1986 | CA1200195A1 Lubricator valve apparatus |
| 02/04/1986 | CA1200193A1 Downhole safety system for use while servicing wells |
| 01/28/1986 | US4566541 Production tubes for use in the completion of an oil well |
| 01/28/1986 | US4566540 Hydraulically actuated control fluid communication nipple |
| 01/28/1986 | US4566534 Solenoid actuated well safety valve |
| 01/28/1986 | US4566482 Top entry trunnion ball valve |
| 01/28/1986 | US4566478 Well safety and kill valve |
| 01/22/1986 | EP0168632A1 Removable functional module for a submarine oil production installation |
| 01/21/1986 | US4565215 Chemical injection valve |
| 01/21/1986 | US4565213 Ball valve device with hold-open tube |
| 01/15/1986 | EP0168368A1 Control method and control device for a down-the-hole rock drill |
| 01/07/1986 | US4562888 Tubing head adapter and valve |
| 01/07/1986 | US4562854 Piston actuated chemical injection valve |
| 01/07/1986 | US4562853 Downhole fire control |
| 01/07/1986 | CA1198984A1 Control fluid communication nipple |
| 01/02/1986 | EP0166568A2 Cement collar and method of use |
| 12/31/1985 | US4561499 Tubing suspension system |
| 12/24/1985 | US4560005 Sliding-sleeve valve for an oil well |
| 12/24/1985 | US4560004 Drill pipe tester - pressure balanced |
| 12/10/1985 | US4557333 Low pressure responsive downhole tool with cam actuated relief valve |
| 12/10/1985 | US4557331 Well perforating method and apparatus |
| 12/10/1985 | US4557325 Remote control fracture valve |
| 12/10/1985 | CA1197773A1 Retractable stinger purge valve |
| 12/03/1985 | CA1197458A1 Chemical injection valve with openable bypass |
| 11/26/1985 | CA1197176A1 Combination cementing shoe and basket |
| 11/19/1985 | US4553599 Control apparatus for oil well production string closing tool |
| 11/19/1985 | US4553598 Full bore sampler valve apparatus |
| 11/19/1985 | US4553589 Fire-safe surface-controlled subsurface safety valve control line/wellhead connector and blowout preventer |
| 11/19/1985 | US4553428 Drill stem testing apparatus with multiple pressure sensing ports |
| 11/19/1985 | CA1196856A1 Safety system |
| 11/12/1985 | US4552219 For use in controlling flow in a well conduit |
| 11/12/1985 | US4552218 Fluid pressure responsive valving apparatus |
| 11/05/1985 | US4550780 Pressure operated safety valve with lock means |
| 10/30/1985 | EP0159900A2 Apparatus and method for inserting flow control means into a well casing |
| 10/29/1985 | CA1195921A1 Blow out preventer warning system |
| 10/22/1985 | CA1195607A1 Surface controlled subsurface safety valve |
| 10/16/1985 | EP0158465A2 Multi-mode testing tool |
| 10/15/1985 | US4546828 Diverter system and blowout preventer |