| Patents for E21B 23 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (12,712) |
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| 10/06/1981 | US4293038 Ball valve assembly |
| 10/06/1981 | US4293034 Well safety system method and apparatus |
| 09/29/1981 | US4291724 Flowline switching apparatus |
| 09/15/1981 | US4289205 Well safety system method and apparatus |
| 09/15/1981 | US4289202 Well tubing coupling apparatus |
| 09/15/1981 | US4289200 Retrievable well apparatus |
| 09/08/1981 | US4287949 Setting tools and liner hanger assembly |
| 09/08/1981 | CA1108435A1 Method and apparatus for logging inclined earth boreholes using the measured acceleration of the well logging instrument |
| 09/03/1981 | WO1981002457A1 Packer arrangements for oil wells and the like |
| 09/01/1981 | US4286676 Crank connector for directional drilling |
| 09/01/1981 | US4286663 Hydraulic pumping rod connecting and disconnecting device |
| 09/01/1981 | US4286661 Equalizing valve for use in a well tool string |
| 09/01/1981 | US4286657 Actuator |
| 08/25/1981 | US4285400 Releasing tool for pressure activated packer |
| 08/18/1981 | US4284152 Pump in core breaker carrier |
| 08/18/1981 | US4284137 Anti-kick, anti-fall running tool and instrument hanger and tubing packoff tool |
| 08/18/1981 | US4284136 Positioning deflection wedges |
| 08/11/1981 | CA1106958A1 Wellbore instrument hanger |
| 08/06/1981 | WO1981002181A1 Tracked cable guide assembly to store conductor cable inside a drill pipe |
| 08/04/1981 | US4282523 Method and apparatus for logging inclined earth boreholes |
| 08/04/1981 | US4281722 Retractable bit system |
| 07/28/1981 | USRE30690 Seal |
| 07/07/1981 | US4276937 Well safety system |
| 07/07/1981 | US4276932 Well casing hanger assembly |
| 07/07/1981 | US4276931 Junk basket |
| 06/16/1981 | US4273464 Wire line anchor |
| 06/16/1981 | US4273372 Apparatus for use in lowering casing strings |
| 06/16/1981 | US4273190 Method and apparatus for gravel packing multiple zones |
| 06/09/1981 | US4271908 Tracked cable guide assembly and method for storing conductor cable inside a drill pipe |
| 06/09/1981 | US4271902 Self-discriminating side pocket mandrel and method of manufacturing same |
| 06/09/1981 | CA1102690A1 Reinforced seal unit for pumpdown pistons or well swabs |
| 06/02/1981 | US4270611 Mooring station and transfer terminal for offshore hydrocarbon production |
| 05/26/1981 | US4269268 Hanger apparatus for suspending pipes with positive retrieval capability |
| 05/05/1981 | US4265313 Mooring station and transfer terminal for offshore hydrocarbon production |
| 05/05/1981 | US4265306 Latch for well tools |
| 05/05/1981 | US4265305 Mounting and shock absorber assembly for borehole telemetry apparatus |
| 04/21/1981 | US4262702 Conductor pipe plug |
| 04/07/1981 | US4260022 Through the flow-line selector apparatus and method |
| 04/07/1981 | US4260021 Plug catcher tool |
| 03/31/1981 | US4258803 Core barrel for obtaining and retrieving subterranean formation samples |
| 03/17/1981 | US4256180 Method of moving a through-the-flowline installed safety valve through a curved flow line |
| 03/17/1981 | US4256179 Indexing tool for use in earth borehole drilling and testing |
| 03/10/1981 | US4254829 Well locking device |
| 03/10/1981 | CA1097328A1 Method and core barrel apparatus for obtaining and retrieving subterranean formation samples |
| 03/03/1981 | US4253521 Setting tool |
| 03/03/1981 | CA1096953A1 Remote istrumentation apparatus |
| 02/24/1981 | US4252196 Control tool |
| 02/24/1981 | US4252149 Tool diverter |
| 02/24/1981 | CA1096302A1 High temperature well packer |
| 02/19/1981 | WO1981000429A1 Self-discriminating side pocket mandrel and method of manufacturing same |
| 02/17/1981 | US4250960 Chemical cutting apparatus |
| 02/10/1981 | US4249601 Hydraulic running tool for liner hangers |
| 02/03/1981 | US4248300 Method of and apparatus for positioning retrievable landing nipple in a well bore string |
| 02/03/1981 | US4248299 Packer nose assembly |
| 02/03/1981 | US4247985 TFL Caliper |
| 02/03/1981 | CA1094950A2 Locating system |
| 02/03/1981 | CA1094943A1 Reclosable circulating valve for use in oil well testing |
| 01/13/1981 | CA1093458A1 Well testing tool system |
| 01/13/1981 | CA1093457A1 Running tool |
| 01/06/1981 | US4242915 Extensometer anchor |
| 12/16/1980 | US4239082 Multiple flow valves and sidepocket mandrel |
| 12/09/1980 | US4237979 Valve for hydraulic setting packer setting tool and method of setting a hydraulically settable packer therewith |
| 12/09/1980 | CA1091145A1 Well casing hanger assembly |
| 12/02/1980 | CA1090698A1 Well logging method and apparatus using friction- reducing agents |
| 11/18/1980 | CA1089762A1 Well tool |
| 11/11/1980 | US4232889 Recockable well hanger |
| 11/11/1980 | US4232888 Wireline releasable seal connector for wellpipe strings |
| 11/04/1980 | CA1088862A1 Through the flowline selector |
| 10/28/1980 | US4230186 Simplified subsea production wellhead |
| 10/28/1980 | CA1088413A1 Well testing tool |
| 10/14/1980 | US4227573 Reinforced seal unit for pumpdown pistons or well swabs |
| 10/14/1980 | CA1087522A1 Full flow tubing plug |
| 10/14/1980 | CA1087521A2 Non-metallic sucker rod string |
| 09/30/1980 | US4224986 Diverter tool |
| 09/30/1980 | CA1086639A1 Locating system |
| 09/30/1980 | CA1086636A1 Method and apparatus using flexible hose in logging highly deviated or very hot earth boreholes |
| 09/23/1980 | US4223700 Flow line switch |
| 09/17/1980 | EP0015726A1 Method relating to the pumping of fluid along a tubular structure in a bore of a well and tubular component for use in such structure |
| 08/12/1980 | US4216827 Fluid pressure set and released well packer apparatus |
| 08/05/1980 | CA1083034A1 Well latch |
| 07/29/1980 | CA1082592A1 Well equipment setting or retrieval tool |
| 07/15/1980 | US4212352 Gripping member for well tools |
| 07/15/1980 | CA1081613A1 Collar lock and seal assembly for well tools |
| 07/15/1980 | CA1081612A1 Well tool with a pawl |
| 06/17/1980 | US4207925 Reversible baffle plate |
| 06/17/1980 | CA1079628A1 Tubing tester |
| 06/12/1980 | WO1980001187A1 Diverter tool |
| 05/27/1980 | US4204426 Measuring casing coupler apparatus |
| 05/27/1980 | CA1078368A1 Downhole connector for use with drill string telemetering system |
| 05/20/1980 | CA1077831A1 Chemical cutting apparatus and method for use in wells |
| 05/20/1980 | CA1077827A1 Anchoring apparatus for tools used in determining the stuck point of a conduit in a borehole |
| 05/06/1980 | US4201265 Sidepocket mandrel and method of making |
| 04/22/1980 | US4199210 Automatic coupling and decoupling apparatus |
| 04/15/1980 | US4197909 Protector for a deflector guide of a mandrel |
| 04/15/1980 | CA1075595A1 Chemical cutting apparatus and method for use in wells |
| 04/08/1980 | US4196781 Telescoping joint |
| 04/01/1980 | CA1074693A1 Apparatus for logging inclined earth boreholes |
| 03/25/1980 | US4194561 Placement apparatus and method for low density ball sealers |
| 03/25/1980 | CA1074292A1 Method and apparatus for telemetering information from a borehole to the surface |
| 03/18/1980 | US4193450 Surface controlled subsurface safety valve |