| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 07/26/1977 | US4038632 Oil and gas well disaster valve control system |
| 07/19/1977 | US4036296 Subsurface well apparatus |
| 07/19/1977 | US4036247 Multi-pressure, single line supply system |
| 07/05/1977 | US4033408 Go-devil storage and discharge assembly |
| 06/28/1977 | US4031960 Circulating valve |
| 06/28/1977 | US4031957 Method and apparatus for testing and treating well formations |
| 06/28/1977 | US4031955 Down hole inhibitor injector |
| 06/21/1977 | US4030550 Method of operating a subsurface safety valve in response to an increase or decrease in ambient well fluid pressure |
| 06/14/1977 | US4029289 Control system for gate-valves |
| 05/31/1977 | US4027286 Multiplexed data monitoring system |
| 05/31/1977 | US4026363 Apparatus and method for performing a desired operation at a specified location in a well |
| 05/31/1977 | US4026362 Subsurface well apparatus having improved operator means and method of using same |
| 05/24/1977 | US4024913 Well installations employing non-metallic lines, tubing casing and machinery |
| 05/24/1977 | US4024912 Hydrogen generating system |
| 05/10/1977 | US4022427 Sleeve valve mandrel and seal means for indexing valve assembly |
| 05/10/1977 | US4022426 Indexing valve mechanism |
| 05/10/1977 | US4022273 Bottom hole flow control apparatus |
| 05/03/1977 | US4021137 Storm choke apparatus for submergible pumps |
| 04/26/1977 | US4019574 Subsurface well apparatus having flexing means and method of using same |
| 03/29/1977 | US4014386 Subsurface safety valve apparatus |
| 03/15/1977 | US4011892 Three port non-interflow poppet valve |
| 03/01/1977 | US4009756 Method and apparatus for flooding of oil-bearing formations by downward inter-zone pumping |
| 03/01/1977 | US4009753 Subsea master valve apparatus |
| 02/22/1977 | US4008760 Circulating valve |
| 02/08/1977 | US4007380 Control of chokes |
| 02/01/1977 | US4005751 Deep well safety valve |
| 01/11/1977 | US4002202 Fail-safe safety cut-off valve for a fluid well |
| 01/04/1977 | US4000780 Storm choke |
| 12/28/1976 | US3999574 Hydraulic safety stop-valve |
| 12/07/1976 | US3995691 Tool for controlling fluid flow at remote locations |
| 11/30/1976 | US3994338 Hydrostatic pressure release for bottom hole oil well pumps |
| 11/23/1976 | US3993136 Apparatus for operating a closure element of a subsurface safety valve and method of using same |
| 11/23/1976 | US3993130 Method and apparatus for controlling the injection profile of a borehole |
| 11/23/1976 | US3993129 Fluid injection valve for wells |
| 11/09/1976 | US3990511 Well safety valve system |
| 11/09/1976 | US3990508 Remotely operated well safety valves |
| 11/02/1976 | US3989330 Electrical kelly cock assembly |
| 11/02/1976 | US3988898 Pipelines and marine platforms |
| 10/26/1976 | US3987849 Well tool |
| 10/26/1976 | US3987848 Pressure-balanced well service valve |
| 10/26/1976 | US3987846 Wellhead shut-off valve |
| 10/19/1976 | US3986554 Pressure controlled reversing valve |
| 10/12/1976 | US3984988 Obturating device, especially for injection tubes |
| 09/28/1976 | US3982592 Hydrogenation; igniting a hydrogen and oxygen mixture |
| 09/28/1976 | US3982591 Downhole recovery system |
| 09/21/1976 | US3981364 Well tubing paraffin cutting apparatus and method of operation |
| 09/21/1976 | US3981360 Well tubing drain |
| 09/21/1976 | US3981358 Well safety valve |
| 09/14/1976 | US3980135 Self-contained, retrievable valving assembly |
| 09/14/1976 | US3980134 Well packer with frangible closure |
| 09/07/1976 | US3978922 Gas storage well safety valve apparatus |
| 08/24/1976 | US3976136 Pressure operated isolation valve for use in a well testing apparatus and its method of operation |
| 08/17/1976 | US3974876 Downhole fluid flow regulator |
| 08/10/1976 | US3973630 Wash-out tool and method of use thereof |
| 08/10/1976 | US3973587 Check valve assembly |
| 08/10/1976 | US3973586 Velocity-tubing pressure actuated subsurface safety valve |
| 07/27/1976 | US3971438 Wireline safety valve with split ball |
| 07/20/1976 | US3970147 Method and apparatus for annulus pressure responsive circulation and tester valve manipulation |
| 07/20/1976 | US3970145 Standing valve assembly |
| 07/20/1976 | US3970144 Subsurface shutoff valve and control means |
| 07/06/1976 | US3967680 Method and apparatus for actuating a downhole device carried by a pipe string |
| 07/06/1976 | US3967679 Mud saver valve |
| 07/06/1976 | US3967647 Subsea control valve apparatus |
| 06/29/1976 | US3965980 Mud saver valve |
| 06/29/1976 | US3965977 Control line exiting coupling |
| 06/22/1976 | US3964544 Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation |
| 06/22/1976 | US3964305 Apparatus for testing oil wells |
| 06/15/1976 | US3963076 Method and apparatus for gravel packing well bores |
| 06/15/1976 | US3963050 Pneumatic relay |
| 06/01/1976 | US3961308 Oil and gas well disaster valve control system |
| 06/01/1976 | US3960366 Reverse acting lock open crossover valve |
| 05/25/1976 | US3958633 Flapper-type subsurface safety valve |
| 05/11/1976 | US3955624 Safety valve for controlling flow in a flow conductor |
| 05/11/1976 | US3955623 Subsea control valve apparatus |
| 05/04/1976 | US3954138 Safety plug for sealing-off the tubing of a producing oil or gas well |
| 04/27/1976 | US3952763 Sequence control valve |
| 04/20/1976 | US3951338 Heat-sensitive subsurface safety valve |
| 04/06/1976 | US3948322 Multiple stage cementing tool with inflation packer and methods of use |
| 04/06/1976 | US3948318 Flow controlling safety valve |
| 03/02/1976 | US3941348 Safety valve |
| 03/02/1976 | US3941190 Well control apparatus |
| 02/24/1976 | US3939913 Method of using a subsurface safety valve |
| 02/17/1976 | US3938589 Drilling tool |
| 02/10/1976 | US3937251 Fluid pressure operated shut off valve apparatus |
| 01/06/1976 | US3930540 Wellbore circulating valve |