| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 01/16/1979 | US4134455 Oilwell tubing tester with trapped valve seal |
| 01/16/1979 | US4134454 Multi-stage sliding valve fluid operated and pressure balanced |
| 01/09/1979 | US4133768 Flow choke filter for oil and gas wells |
| 01/02/1979 | US4132383 Safety valve control system for production well |
| 12/19/1978 | US4130166 Valve and lubricator apparatus |
| 12/19/1978 | US4130161 Underwater Christmas tree |
| 12/19/1978 | CA1044596A1 Method and apparatus for a pressure controlled reversing valve |
| 12/12/1978 | US4129184 Downhole valve which may be installed or removed by a wireline running tool |
| 12/05/1978 | CA1043696A1 Well control valve apparatus |
| 11/21/1978 | US4126183 Offshore well apparatus with a protected production system |
| 11/21/1978 | CA1042785A1 Pressure operated isolation valve for use in a well testing apparatus and its method of operation |
| 11/14/1978 | US4125165 Annulus pressure controlled test valve with locking annulus pressure operated pressure trapping means |
| 11/14/1978 | US4125155 Tubing hanger with fail-safe control passageway |
| 11/07/1978 | US4124070 Wireline shifting tool apparatus and methods |
| 10/31/1978 | US4122898 Tubing tester |
| 10/10/1978 | US4119147 Pumpdown safety valve |
| 10/10/1978 | US4119146 Surface controlled sub-surface safety valve |
| 09/26/1978 | US4116272 Subsea test tree for oil wells |
| 09/19/1978 | US4114694 No-shock pressure plug apparatus |
| 09/19/1978 | CA1038750A1 Wireline safety valve with split ball |
| 09/12/1978 | US4113018 Oil well testing safety valve |
| 09/12/1978 | US4113012 Reclosable circulation valve for use in oil well testing |
| 09/05/1978 | CA1037864A1 Pressure-balanced well service valve |
| 08/29/1978 | US4109725 Self adjusting liquid spring operating apparatus and method for use in an oil well valve |
| 08/29/1978 | US4109724 Oil well testing valve with liquid spring |
| 08/29/1978 | US4109714 Shutdown system for high pressure well |
| 08/29/1978 | US4109713 Pumping well blow-out preventer |
| 08/22/1978 | US4108257 Apparatus for controlling a well during drilling operations |
| 08/22/1978 | US4108243 Apparatus for testing earth formations |
| 08/15/1978 | CA1036489A1 Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation |
| 08/15/1978 | CA1036488A1 Method and apparatus for annulus pressure responsive circulation and tester valve manipulation |
| 08/08/1978 | US4105075 Test valve having automatic bypass for formation pressure |
| 08/08/1978 | US4105074 Cementing staging tool |
| 08/08/1978 | US4105069 Gravel pack liner assembly and selective opening sleeve positioner assembly for use therewith |
| 08/08/1978 | US4105049 Abrasive resistant choke |
| 08/01/1978 | US4103744 Safety valve and ball type equalizing valve |
| 08/01/1978 | US4103741 Oil well perforation testing device |
| 08/01/1978 | US4103739 Sand release apparatus for a pump |
| 08/01/1978 | US4103498 Plugs for bores in rocks or the like |
| 07/18/1978 | US4100969 Tubing tester valve apparatus |
| 07/11/1978 | US4099563 Steam injection system for use in a well |
| 07/11/1978 | US4099562 Device for limiting leakage from well head stuffing box assembly |
| 06/13/1978 | US4094359 Apparatus and methods for testing earth formations |
| 06/13/1978 | US4094334 Ocean thermal energy conversion valve |
| 05/23/1978 | USRE29638 Pressure controlled test valve system for offshore wells |
| 05/23/1978 | US4090565 Control line tubing hanger |
| 05/16/1978 | US4089371 Production shoe |
| 05/02/1978 | US4086935 Remote controlled tubing safety valve |
| 04/11/1978 | US4083409 Full flow bypass valve |
| 04/11/1978 | US4083401 Apparatus and methods for testing earth formations |
| 04/04/1978 | US4082147 Method and apparatus for a surface control system for: subsurface safety valves |
| 04/04/1978 | US4082144 Method and apparatus for running and retrieving logging instruments in highly deviated well bores |
| 03/28/1978 | US4081032 Steam deflector for use in a well |
| 03/07/1978 | US4077473 Well safety valve |
| 03/07/1978 | US4077469 Controlling gas flow of hydrogen and oxygen to produce steam |
| 02/28/1978 | US4076083 Method and apparatus for controlling a well during drilling operations |
| 02/28/1978 | US4076077 Weight and pressure operated well testing apparatus and its method of operation |
| 02/21/1978 | US4074763 Bottom-hole gas-liquid separator |
| 02/21/1978 | US4074761 Drilling tool |
| 02/14/1978 | US4073341 Acoustically controlled subsurface safety valve system |
| 01/31/1978 | US4071088 Retrievable safety valve |
| 01/24/1978 | US4069871 Deep well safety valve |
| 01/24/1978 | US4069866 Pressure apportioning valve apparatus for use with multiple packers |
| 01/24/1978 | US4069834 Thermal safety valve |
| 01/24/1978 | CA1024887A1 Safety valves_ |
| 01/17/1978 | US4068712 Wire-line retrievable, mechanically operated spot valve |
| 01/10/1978 | US4067387 Subsurface well apparatus having flexing means and method of using same |
| 01/03/1978 | US4066241 Seal means for valve assembly |
| 01/03/1978 | US4066139 Sampling drill |
| 01/03/1978 | US4066128 Well flow control apparatus and method |
| 12/27/1977 | US4065747 Acoustical underwater communication system for command control and data |
| 12/27/1977 | US4064941 Apparatus and method for mixing separated fluids downhole |
| 12/27/1977 | US4064937 Annulus pressure operated closure valve with reverse circulation valve |
| 12/20/1977 | US4063594 Pressure-balanced well service valve |
| 12/20/1977 | US4063593 Full-opening annulus pressure operated sampler valve with reverse circulation valve |
| 12/13/1977 | US4062406 Valve and lubricator apparatus |
| 12/13/1977 | US4062379 Safety valve control system for production well |
| 11/22/1977 | US4059157 Well control valve apparatus |
| 11/22/1977 | US4059153 Weight and pressure operated well testing apparatus and its method of operation |
| 11/15/1977 | USRE29471 Oil well testing apparatus |
| 11/15/1977 | US4058165 Wellbore circulating valve |
| 11/15/1977 | US4058162 Well tool adapted to be locked within and sealed with respect to the bore of the well conduit |
| 10/04/1977 | US4051899 Reset and pulling tool for manipulating well safety valve |
| 10/04/1977 | US4051897 Well testing tool |
| 10/04/1977 | US4051894 Single string hanger system |
| 09/27/1977 | US4050516 Method of injecting fluids into underground formations |
| 09/20/1977 | US4049057 Paraffin cleaner |
| 09/20/1977 | US4049052 Subsurface annulus safety valve |
| 09/13/1977 | US4047853 Hydraulic unloading and circulating device |
| 09/13/1977 | US4047695 Adjustable choke |
| 09/13/1977 | US4047564 Weight and pressure operated well testing apparatus and its method of operation |
| 09/06/1977 | US4046191 Subsea hydraulic choke |
| 08/30/1977 | US4044835 Subsurface well apparatus having improved operator means and method for using same |
| 08/30/1977 | US4044832 Concentric gravel pack with crossover tool and method of gravel packing |
| 08/30/1977 | US4044829 Method and apparatus for annulus pressure responsive circulation and tester valve manipulation |
| 08/23/1977 | US4043392 Well system |
| 08/16/1977 | US4042033 Combination subsurface safety valve and chemical injector valve |
| 08/16/1977 | US4042024 Subsurface well apparatus having flexing means and method of using same |
| 08/09/1977 | US4040488 Differential valve |
| 08/02/1977 | US4039031 Well control valve apparatus |