| 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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| 06/29/1988 | EP0272770A2 Tubular connector |
| 06/29/1988 | CN85102547B Synchronizalion tube-pulling machine |
| 06/14/1988 | US4751688 Downhole electromagnetic seismic source |
| 06/14/1988 | US4750865 Subsurface stuffing box assembly |
| 06/14/1988 | US4750770 Device for connecting a drill column to a pipe or the like |
| 06/14/1988 | US4750564 Tubing resettable well packer |
| 06/14/1988 | US4750563 Slip gripping mechanism with automatic segment alignment |
| 06/14/1988 | US4750560 Device for releasably connecting well tools |
| 06/14/1988 | US4750559 For use in well bores |
| 06/08/1988 | EP0269638A1 A method and a device for deep hole drilling. |
| 06/07/1988 | US4749341 Method and system for supporting a well pump |
| 06/07/1988 | US4749046 Well drilling and completion apparatus |
| 06/07/1988 | US4749045 Well drilling and completion apparatus |
| 06/07/1988 | US4749035 Tubing packer |
| 06/07/1988 | CA1237666A1 Setting tool with retractable torque fingers |
| 06/07/1988 | CA1237665A1 Tubular member anchoring arrangement and method |
| 06/07/1988 | CA1237662A1 Setting tool with retractable torque fingers |
| 05/24/1988 | US4745974 Well tool lock mandrel and handling tools therefor |
| 05/24/1988 | US4745973 Selective running tool for wells |
| 05/17/1988 | US4744438 Seismic probe more particularly usable in an untubed drilling shaft |
| 05/17/1988 | US4744415 Kickover tool for placing and removing well flow control devices |
| 05/11/1988 | EP0267096A1 Tool for the measurement of the pressure in an oil well |
| 05/10/1988 | US4742871 Device for positioning a tool within a wellbore flow string |
| 05/05/1988 | WO1988003222A1 Apparatus for controlling the operation of a downhole tool |
| 05/04/1988 | CN87208285U Fixing device for torque transducer with rotating disc |
| 05/03/1988 | CA1236008A1 Packer assembly |
| 05/03/1988 | CA1236003A1 Apparatus and method of well preparation for chemical treatment of produced fluids |
| 04/27/1988 | EP0198896B1 Device for connecting a boring line with a tube or similar item |
| 04/19/1988 | US4738599 Well pump |
| 04/19/1988 | CA1235374A1 Parallel flow tube apparatus |
| 04/19/1988 | CA1235372A1 Self-contained bore hole flow measurement system and method therefor |
| 04/13/1988 | EP0263148A1 Downhole electromagnetic seismic source. |
| 04/12/1988 | US4736798 Rapid cycle annulus pressure responsive tester valve |
| 04/06/1988 | EP0262822A2 Releasable connection for conduit string |
| 04/05/1988 | US4735268 Mechanical setting tool |
| 04/05/1988 | US4735266 Method and apparatus for isolating a plurality of vertically spaced perforations in a well conduit |
| 03/23/1988 | EP0260878A2 Apparatus for disconnecting conduit string |
| 03/22/1988 | US4732212 Attachment device for a slip gripping mechanism with floating cone segments |
| 03/15/1988 | US4730851 Downhole expandable casting hanger |
| 03/09/1988 | EP0259170A2 Plug for use in wellbores |
| 03/08/1988 | US4729433 Safety valve for oil-wells and installation tool for the valve |
| 03/08/1988 | US4729429 Hydraulic pressure propelled device for making measurements and interventions during injection or production in a deflected well |
| 03/02/1988 | EP0257943A2 Apparatus having a radially movable member |
| 03/01/1988 | US4727939 Tool for closing a production column in a well |
| 02/23/1988 | US4726425 Combination landing unit and seal assembly |
| 02/23/1988 | US4726422 Annular safety assembly for an oil well, especially a double production zone well |
| 02/23/1988 | US4726421 Latching devices |
| 02/23/1988 | US4726419 Single zone gravel packing system |
| 02/16/1988 | CA1232835A1 Well test apparatus and methods |
| 02/09/1988 | US4723890 Articulated jet pump, usable more particularly in TFL technique for activating hydrocarbon or water producing wells |
| 02/02/1988 | US4722393 Latch assembly for well tools |
| 02/02/1988 | US4722392 Multiple position service seal unit with positive position indicating means |
| 02/02/1988 | US4722390 Adjustable collet |
| 02/02/1988 | CA1232321A1 Method and apparatus for monitoring well tubing fluid |
| 01/12/1988 | US4718494 Methods and apparatus for selectively controlling fluid communication between a pipe string and a well bore annulus |
| 01/12/1988 | US4718488 Pump-out plug system for a well conduit |
| 01/07/1988 | DE3621354A1 Borehole closure with expanding ring element |
| 01/05/1988 | US4717473 Apparatus for time-averaged or composite sampling of chemicals in ground water |
| 01/05/1988 | US4716963 Apparatus for well completion operations |
| 01/05/1988 | CA1231044A1 Apparatus for monitoring a parameter in a well |
| 12/29/1987 | US4715755 Securing device for securing in cavities |
| 12/29/1987 | US4715470 Downhole electromagnetic seismic source |
| 12/29/1987 | US4715469 Borehole seismic receiver |
| 12/29/1987 | US4715446 Device and method for the temporary protection of a working tool or measuring instrument fixed to the end of a drill string |
| 12/29/1987 | US4715445 For use with a well tool |
| 12/29/1987 | US4715441 Side pocket mandrel |
| 12/23/1987 | EP0250106A2 Lock for downhole apparatus |
| 12/22/1987 | US4714116 Downhole safety valve operable by differential pressure |
| 12/22/1987 | CA1230545A1 Electric wireline packer/retriever apparatus |
| 12/15/1987 | US4712621 Casing hanger running tool |
| 12/15/1987 | US4712615 Liner hanger assembly with setting tool |
| 12/15/1987 | US4712614 Liner hanger assembly with combination setting tool |
| 12/08/1987 | US4711326 Slip gripping mechanism |
| 12/08/1987 | US4711305 Multi-mode testing tool and method of testing |
| 12/08/1987 | US4711304 Method of and apparatus for injection of steam into multiple well zones |
| 11/25/1987 | EP0246722A1 Apparatus for anchoring downhole corrosion coupons |
| 11/24/1987 | US4708208 Method and apparatus for setting, unsetting, and retrieving a packer from a subterranean well |
| 11/19/1987 | EP0246024A2 Rapid cycle annulus pressure responsive tester valve |
| 11/19/1987 | EP0245414A1 Handling device |
| 11/18/1987 | CN86208253U Well-sleeve reinforcer suitable for oil well and water well |
| 11/17/1987 | US4706747 For use in wellbore operations |
| 11/10/1987 | US4705111 Tubing assembly |
| 11/10/1987 | CA1229043A1 Well tool |
| 11/10/1987 | CA1229042A1 Safety valve for oil well |
| 11/03/1987 | US4704514 Heating rate variant elongated electrical resistance heater |
| 11/03/1987 | US4703804 From a well casing |
| 11/03/1987 | CA1228910A1 Apparatus for producing geophysical measurements in a borehole |
| 11/03/1987 | CA1228800A1 Tool for use in a testing string disposed in a well bore |
| 10/27/1987 | US4702313 Slip and slip assembly for well tools |
| 10/21/1987 | EP0242239A1 Tool for closing a well's production column |
| 10/20/1987 | US4701890 Device for locking a set of gimbal-mounted detectors |
| 10/20/1987 | US4700778 Wet connector for use with drill pipe conveyed logging apparatus |
| 10/13/1987 | US4699216 Blowout preventer for a side entry sub |
| 10/13/1987 | CA1228018A1 Retrievable telemetry system |
| 10/07/1987 | CN87101970A Downhole electromagnetic seismic source |
| 10/06/1987 | US4697638 Downhole logging and servicing system with manipulatable logging and servicing tools |
| 10/06/1987 | CA1227749A1 Tubing resettable well tool |
| 10/06/1987 | CA1227746A1 Locking device for well tools |
| 09/30/1987 | EP0238601A1 Gauge carrier for incorporation into tubing for flow-testing of oil and gas exploration wells |
| 09/29/1987 | CA1227417A1 Method and apparatus for oil well measurements |