| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 03/31/1987 | US4653593 Control method and control device for a down-the-hole rock drill |
| 03/24/1987 | US4652876 Remote switch position determination using constant current signaling |
| 03/24/1987 | US4651970 Valve actuator with auxiliary energy storage means |
| 03/24/1987 | US4651969 Valve actuator |
| 03/24/1987 | US4651829 Subsurface control valve |
| 03/24/1987 | US4651828 Safety valve in particular for closing an oil well |
| 03/24/1987 | US4651827 Hydraulically controlled safety valves for incorporation in production tubes of hydrocarbon production wells |
| 03/24/1987 | US4651822 Dump and kill valve for a sidepocket mandrel |
| 03/17/1987 | US4650153 Oil well safety valve for use with drill pipe |
| 03/17/1987 | US4650151 Subsea gate valve actuator with external manual override and drift adjustment |
| 03/17/1987 | US4650001 Assembly for reducing the force applied to a slot and lug guide |
| 03/17/1987 | US4649993 Combination electrically operated solenoid safety valve and measuring sensor |
| 03/10/1987 | US4648458 Process for eliminating static venting of vapor-dominated geothermal wells |
| 03/10/1987 | US4648457 Injection control device for subterranean well conduit |
| 03/04/1987 | EP0212814A2 Method of operating APR valve in wellbore |
| 03/03/1987 | US4647005 For use between sections of well tubing |
| 03/03/1987 | US4646838 Low pressure responsive tester valve with spring retaining means |
| 03/03/1987 | US4646828 Apparatus for enhanced oil recovery |
| 02/26/1987 | WO1987001159A1 Valve module, specially for undersea petroleum wells |
| 02/26/1987 | WO1987001158A1 Valve module, specially for undersea petroleum wells |
| 02/26/1987 | WO1987001157A1 Valve module, specially for undersea petroleum wells |
| 02/24/1987 | US4645007 Tubing drain valve |
| 02/24/1987 | US4645006 Annulus access valve system |
| 02/17/1987 | US4643024 Method of, and measuring tube and measuring probe for, measuring fluid pressure in a sealed bore hole |
| 02/10/1987 | US4641707 Well apparatus |
| 02/05/1987 | DE3526557A1 Tubular, lost borehole plug |
| 02/03/1987 | USRE32343 Well safety valve |
| 02/03/1987 | US4640363 Bleedoff tool for well test system |
| 01/29/1987 | WO1987000572A1 Drop ball sub-assembly for a down-hole device |
| 01/28/1987 | EP0210110A2 Full-bore sample-collecting apparatus |
| 01/27/1987 | US4638833 Choke valve |
| 01/20/1987 | US4637471 Tubing drain valve useful with heavy, sand-bearing oil |
| 01/20/1987 | US4637468 Method and apparatus for multizone oil and gas production |
| 01/20/1987 | US4637463 Echo ranging gun |
| 01/13/1987 | US4636934 Well valve control system |
| 01/13/1987 | US4635718 Continuous obstruction monitor for well logging tools |
| 01/07/1987 | EP0207785A2 Actuator for wellbore closure valve |
| 01/07/1987 | EP0207755A2 Top entry trunnion ball valve |
| 01/06/1987 | US4633954 Well production controller system |
| 01/06/1987 | US4633952 Multi-mode testing tool and method of use |
| 12/30/1986 | US4632188 Subsea wellhead apparatus |
| 12/30/1986 | US4632187 For use in tubing above a packer set in casing above a well formation |
| 12/30/1986 | US4632184 Submersible pump safety systems |
| 12/17/1986 | EP0205297A2 Improvements in down-hole blow-out preventers |
| 12/17/1986 | EP0205250A1 Improvements in subsurface device actuators |
| 12/16/1986 | US4629402 Valve assembly |
| 12/16/1986 | US4629002 Equalizing means for a subsurface well safety valve |
| 12/16/1986 | US4628996 Full opening check valve |
| 12/10/1986 | EP0204619A2 Subsea master valve for use in well testing |
| 12/09/1986 | US4627492 Well tool having latching mechanism and method of utilizing the same |
| 12/03/1986 | EP0203172A1 Non-return valve for bore hole sleeves. |
| 12/02/1986 | US4625813 Method and apparatus for coring in subaqueous structures |
| 12/02/1986 | US4625798 Submersible pump installation, methods and safety system |
| 12/02/1986 | US4625764 Relay valve |
| 11/26/1986 | EP0203008A1 Hydraulically actuated safety valve for inclusion into an oil well tubing |
| 11/25/1986 | US4624626 Venturi odor dissipator |
| 11/25/1986 | US4624317 Well tool with improved valve support structure |
| 11/25/1986 | US4624315 Subsurface safety valve with lock-open system |
| 11/25/1986 | US4624310 Well apparatus |
| 11/20/1986 | EP0202151A1 Apparatus for a drill pipe or the like, comprising a side entry SUB for a cable |
| 11/11/1986 | US4621695 Balance line hydraulically operated well safety valve |
| 11/11/1986 | US4621689 Cable suspended submergible pumping system with safety valve |
| 11/06/1986 | WO1986006454A1 Oil well safety valve for use with drill pipe |
| 11/05/1986 | EP0200535A2 Verification of a surface controlled subsurface actuating device |
| 11/04/1986 | US4620597 High pressure injection valve |
| 11/04/1986 | CA1213517A1 Tester valve with silicone liquid spring |
| 11/04/1986 | CA1213514A1 Annulus sample chamber, full bore, annulus pressure responsive sampler |
| 10/29/1986 | EP0199669A2 Choke valve especially used in oil and gas wells |
| 10/28/1986 | US4619325 Well surging method and system |
| 10/28/1986 | US4619320 Subsurface well safety valve and control system |
| 10/28/1986 | CA1213210A1 Differential pressure actuated vent assembly |
| 10/21/1986 | US4618000 Pump open safety valve and method of use |
| 10/21/1986 | US4617999 Downhole tool with compression chamber |
| 10/21/1986 | US4617992 System and choke valve actuator mechanism for operating a plunger lift well |
| 10/21/1986 | US4617960 Verification of a surface controlled subsurface actuating device |
| 10/15/1986 | EP0197566A1 Method for the controlled withdrawal of the injection point of gasification agents in the seam during the underground gasification of coal |
| 10/14/1986 | US4616700 Automatic well test system and method |
| 10/07/1986 | CA1212316A1 Packer assembly valve |
| 10/07/1986 | CA1212312A1 Electronically controlled gas lift apparatus |
| 09/30/1986 | US4614148 Control valve system for blowout preventers |
| 09/23/1986 | US4612983 Shear type gate valve |
| 09/16/1986 | US4611630 For determining fluid flow rate |
| 09/09/1986 | US4610308 Bottom hole sampler and safety valve and valve therefor |
| 09/09/1986 | CA1211043A1 Differential vent and bar actuated circulating valve and method |
| 09/09/1986 | CA1211038A1 Low pressure responsive downhole tool with cam actuated relief valve |
| 09/09/1986 | CA1211037A1 Low pressure responsive downhole tool with cam actuated relief valve |
| 09/09/1986 | CA1211036A1 Low pressure responsive downhole tool |
| 09/09/1986 | CA1211035A1 Low pressure responsive downhole tool with floating shoe retarding means |
| 09/09/1986 | CA1211026A1 Pressure device |
| 09/02/1986 | US4609005 Full-bore well tool |
| 08/27/1986 | EP0192400A2 Gravel-packing a well |
| 08/27/1986 | EP0121566B1 Retrievable inside blowout preventer valve apparatus |
| 08/26/1986 | US4607691 Non-orienting, multiple ported, cylindrical pressure transfer device |
| 08/19/1986 | US4606408 Method and apparatus for gravel-packing a well |
| 08/13/1986 | EP0190864A2 Pressure-responsive downhole well tool |
| 08/13/1986 | EP0190529A1 Remotely controlled flow-responsive actuating device, in particular for actuating a stabilizer in a drill string |
| 08/12/1986 | US4605074 Method and apparatus for controlling borehole pressure in perforating wells |
| 08/12/1986 | US4605070 Redundant safety valve system and method |
| 08/05/1986 | US4603742 Subsurface safety valve |
| 08/05/1986 | US4603741 Weight actuated tubing valve |