| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 09/23/1980 | US4223736 Method for shutting in a production well |
| 09/23/1980 | CA1086220A1 Oil well testing valve with liquid spring |
| 09/16/1980 | CA1085720A1 Subsea valve apparatus having hydrate inhibiting injection |
| 09/02/1980 | US4220206 Quick opening closure arrangement for well completions |
| 09/02/1980 | US4220176 Methods and apparatus for controlling fluid flow |
| 09/02/1980 | CA1084836A1 Wireline shifting tool apparatus and method |
| 08/12/1980 | US4216830 Flapper valve |
| 08/12/1980 | CA1083478A1 Abrasive resistant choke |
| 08/05/1980 | US4215749 Gate valve for shearing workover lines to permit shutting in of a well |
| 08/05/1980 | US4215748 Lockout for a well injection valve |
| 08/05/1980 | US4215746 Pressure responsive safety system for fluid lines |
| 08/05/1980 | CA1083033A1 Tubing tester valve apparatus |
| 08/05/1980 | CA1083032A1 Steam injection system for use in a well |
| 07/29/1980 | US4214606 Subsurface safety valve |
| 07/22/1980 | US4213508 Downhole fire control |
| 07/15/1980 | US4212355 Tubing manipulated test valve and latch assembly |
| 07/08/1980 | US4211280 Downhole surge tools, method and apparatus |
| 07/08/1980 | CA1081116A1 Steam deflector for use in a well |
| 07/01/1980 | US4210207 Valve apparatus |
| 06/24/1980 | US4209065 Thermal-operated valve for control of coolant rate of flow in oil wells |
| 06/17/1980 | CA1079628A1 Tubing tester |
| 06/10/1980 | CA1079157A1 Surface controlled sub-surface safety valve |
| 05/27/1980 | US4204426 Measuring casing coupler apparatus |
| 05/20/1980 | CA1077830A1 Apparatus for testing earth formations |
| 05/20/1980 | CA1077829A1 Apparatus and methods for testing earth formations |
| 05/20/1980 | CA1077828A1 Apparatus for testing earth formations |
| 05/13/1980 | US4202368 Safety valve or blowout preventer for use in a fluid transmission conduit |
| 05/06/1980 | US4201364 Radially expandable tubular valve seal |
| 05/06/1980 | US4201363 Tubing retrievable surface controlled subsurface safety valve |
| 05/06/1980 | US4201267 Wild well control method and apparatus |
| 05/06/1980 | CA1076955A1 Full flow bypass valve |
| 04/29/1980 | CA1076453A1 Surface controlled subsurface safety valve |
| 04/29/1980 | CA1076452A1 Subsurface safety valve |
| 04/22/1980 | US4199131 Actuator module for wireline cutting safety valve |
| 04/15/1980 | US4197879 Lubricator valve apparatus |
| 04/15/1980 | CA1075623A1 Fire guarded blowout preventer hose |
| 04/02/1980 | EP0009364A2 Apparatus for remote hydraulic control of a subsea well device |
| 03/25/1980 | US4194718 Choke |
| 03/18/1980 | US4193450 Surface controlled subsurface safety valve |
| 03/18/1980 | US4193449 Valve operating circuit |
| 03/11/1980 | US4192376 Shutting-off device |
| 03/04/1980 | US4191248 Tandem solenoid-controlled safety cut-off valve for a fluid well |
| 02/19/1980 | US4189003 Method of completing wells in which the lower tubing is suspended from a tubing hanger below the wellhead and upper removable tubing extends between the wellhead and tubing hanger |
| 02/19/1980 | US4188999 Expendable plug and packer assembly |
| 02/12/1980 | US4187876 Sub-surface gate valve |
| 02/12/1980 | CA1071529A1 Method and apparatus for running and retrieving logging instruments in highly deviated well bores |
| 01/29/1980 | US4185690 Backsurge well cleaning tool |
| 01/29/1980 | US4185689 Casing bridge plug with push-out pressure equalizer valve |
| 01/22/1980 | CA1070237A1 Subsurface safety valve apparatus |
| 01/15/1980 | US4183404 Plural parallel tubing with safety joints or release from suspended receptacle |
| 01/08/1980 | US4182419 Downhole surge tools |
| 01/01/1980 | US4181175 Control line exiting coupling |
| 12/11/1979 | US4178579 Remote instrumentation apparatus |
| 12/11/1979 | CA1067820A1 Combination subsurface safety valve and chemical injector valve |
| 12/04/1979 | US4176717 Cementing tool and method of utilizing same |
| 11/27/1979 | CA1066986A1 Thermal safety valve |
| 11/06/1979 | US4173256 Subsurface safety valve |
| 10/09/1979 | USRE30110 Fail-safe safety cut-off valve for a fluid well |
| 09/25/1979 | CA1063085A1 Valve actuator having a continuously charged accumulator |
| 09/04/1979 | US4166715 Oil well pumping tube drain device |
| 08/21/1979 | CA1060789A1 Valve and lubricator apparatus |
| 08/14/1979 | USRE30070 Apparatus for treating wells |
| 08/07/1979 | US4163477 Method and apparatus for closing underwater wells |
| 07/31/1979 | US4162705 Center section for oil well perforation testing device |
| 07/31/1979 | US4162691 Tubular valve device |
| 07/31/1979 | CA1059434A1 Well tubing drain |
| 07/24/1979 | US4161985 Tool for removing fluids and loose material from an earth formation |
| 07/24/1979 | US4161960 High and low tubing pressure actuated well safety valve |
| 07/17/1979 | US4161219 Piston actuated well safety valve |
| 07/17/1979 | US4161215 Solenoid operated tubing safety valve |
| 07/10/1979 | US4160484 Surface control well safety valve |
| 07/10/1979 | US4160478 Well tools |
| 07/10/1979 | US4160463 Flow line monitor pilot valve assembly |
| 07/03/1979 | US4159643 Method of and apparatus for measuring bottom hole well pressure |
| 07/03/1979 | CA1057651A1 Differential valve |
| 06/19/1979 | CA1056723A1 Well system |
| 06/12/1979 | CA1056363A1 Method and apparatus for controlling a well during drilling operations |
| 06/05/1979 | US4157167 Valve actuator and pilot assembly therefor |
| 06/05/1979 | US4157117 Oil well tube draining method and means |
| 05/15/1979 | US4154303 Valve assembly for controlling liquid flow in a wellbore |
| 05/15/1979 | US4154299 Gas lift well with improvement |
| 05/08/1979 | CA1054139A1 Electrical kelly cock assembly |
| 05/01/1979 | US4151977 Ocean thermal energy conversion valve |
| 05/01/1979 | US4151881 Apparatus for completing a well |
| 05/01/1979 | US4151880 Vent assembly |
| 05/01/1979 | US4151875 EZ disposal packer |
| 05/01/1979 | CA1053574A1 Method and apparatus for a subsea master valve |
| 04/24/1979 | CA1053146A1 Device for limiting leakage from well head stuffing box assembly |
| 04/17/1979 | US4149698 Surface controlled subsurface safety valve |
| 04/10/1979 | CA1052262A1 Weight and pressure operated well testing apparatus and its method of operation |
| 04/03/1979 | US4147222 Acoustical underwater communication system for command control and data |
| 03/20/1979 | US4144937 Valve closing method and apparatus for use with an oil well valve |
| 03/13/1979 | US4143712 Apparatus for treating or completing wells |
| 03/06/1979 | US4142583 Well tool pack-off with sinker bar release means |
| 02/27/1979 | US4141418 Safety valve hydraulically operated by telescopic drill stem movement |
| 02/20/1979 | US4140153 Subsurface safety valve |
| 01/30/1979 | CA1047397A1 Subsurface annulus safety valve |
| 01/23/1979 | US4135547 Quick disengaging valve actuator |
| 01/23/1979 | CA1046933A1 Subsurface well apparatus having flexing means and method of using same |
| 01/23/1979 | CA1046932A1 Well flow control apparatus and method |