| 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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| 12/12/1989 | CA1263840A2 Packer and service tool assembly |
| 12/12/1989 | CA1263839A2 Packer and service tool assembly |
| 12/06/1989 | EP0345112A1 Device for anchoring a probe in a well by expanding mobile arms |
| 12/05/1989 | US4884632 Side entry sub well logging apparatus and method |
| 11/29/1989 | EP0344060A2 Well tool control system and method |
| 11/28/1989 | US4883355 Slotted thrusters for fluid propelled borescopes |
| 11/28/1989 | US4883121 Downhole lock assembly |
| 11/28/1989 | US4883119 Mechanical latching device operated by dead weight and tension |
| 11/09/1989 | DE3907637A1 Rodless drilling, pressure or cleaning implement |
| 11/07/1989 | US4879695 Method of locating a member in a borehole |
| 10/31/1989 | US4877089 Method and apparatus for coupling wireline tools to coil tubing |
| 10/25/1989 | CN2046539U Quick-installing thread of screw protecting device |
| 10/17/1989 | US4874060 Device for receiving sound waves in a well |
| 10/10/1989 | CA1262233A1 Combination landing unit and seal assembly |
| 10/03/1989 | US4871018 Plugging apparatus for a gravel packer |
| 09/26/1989 | US4869325 Method and apparatus for setting, unsetting, and retrieving a packer or bridge plug from a subterranean well |
| 09/26/1989 | US4869324 Inflatable packers and methods of utilization |
| 09/26/1989 | CA1261456A1 Hydraulic pressure propulsed device for use in deviated well drilling |
| 09/26/1989 | CA1261251A1 Side pocket mandrel |
| 09/26/1989 | CA1259906A1 Method and apparatus for hydraulically releasing from a gravel screen |
| 09/19/1989 | US4867237 Pressure monitoring apparatus |
| 09/12/1989 | US4865131 Method and apparatus for stimulating hydraulically pumped wells |
| 09/05/1989 | US4862966 Liner hanger with collapsible ball valve seat |
| 09/05/1989 | US4862958 Coil tubing fluid power actuating tool |
| 09/05/1989 | US4862957 Packer and service tool assembly |
| 08/30/1989 | EP0221154B1 Mechanical drive packer |
| 08/29/1989 | US4860838 Latching bit sub |
| 08/29/1989 | US4860825 Device for positioning a tool or instrument in a duct |
| 08/23/1989 | CN2043269U Hoop-spring type power clamp head braking mechanism |
| 08/16/1989 | EP0328327A1 Hydraulic setting tool |
| 08/15/1989 | US4856595 Well tool control system and method |
| 08/15/1989 | US4856591 Method and apparatus for completing a non-vertical portion of a subterranean well bore |
| 08/15/1989 | US4856583 Apparatus for treating well bores |
| 08/10/1989 | WO1989007189A1 T-slot mandrel and kickover tool |
| 08/02/1989 | EP0326492A1 Device and method for carrying out operations and/or interventions in a well |
| 08/02/1989 | EP0325835A1 Mechanical latching device operated by dead weight and tension |
| 07/27/1989 | WO1989006740A1 Shut-in tool |
| 07/18/1989 | US4848480 Method and apparatus for wire line protection in a well |
| 07/18/1989 | US4848463 Surface read-out tester valve and probe |
| 07/18/1989 | US4848462 Rotatable liner hanger |
| 07/18/1989 | US4848459 Apparatus for installing a liner within a well bore |
| 07/12/1989 | CN1033858A Method and apparatus for automatically pouring mud during pulling out the drill |
| 07/11/1989 | US4846278 Borehole plug and method |
| 07/11/1989 | US4846270 Trash barrier tool for wells |
| 07/11/1989 | US4846269 Apparatus for monitoring a parameter in a well |
| 07/11/1989 | US4845982 Hydraulic circuit for use in wireline formation tester |
| 07/04/1989 | US4845359 Methods and apparatus for safely handling radioactive sources in measuring-while-drilling tools |
| 07/04/1989 | US4844511 Tubular connector |
| 07/04/1989 | US4844197 Hydraulic release system for use in a borehole apparatus |
| 07/04/1989 | US4844178 Drilling device having a controlled path |
| 07/04/1989 | US4844167 Through-tubing perforating apparatus |
| 07/04/1989 | US4844161 Locking orientation sub and alignment housing for drill pipe conveyed logging system |
| 07/04/1989 | US4844160 Parking mandrel |
| 07/04/1989 | US4844159 Locking device for securing a tool in a well conduit |
| 06/28/1989 | EP0321610A1 Oil well safety valve and setting and retrieving tools for such a valve |
| 06/27/1989 | US4842082 Variable outside diameter tool for use in pikewells |
| 06/27/1989 | US4842064 Well testing apparatus and methods |
| 06/27/1989 | US4842057 Retrievable gravel packer and retrieving tool |
| 06/20/1989 | US4840231 Method and apparatus for setting an inflatable packer |
| 06/20/1989 | US4840230 Retrievable wedging system for coupling downhole devices into cased bore holes |
| 06/20/1989 | US4840229 Multiple position service seal unit with positive position indicating means |
| 06/20/1989 | CA1256019A1 Mechanical drive packer |
| 06/20/1989 | CA1256017A1 Method and apparatus for displacing logging tools in deviated wells |
| 06/15/1989 | DE3835900A1 Verfahren sowie vorrichtung zum austausch einer im erdreich verlegten rohrleitung Method and device for exchange of a laid in the ground-pipeline |
| 06/13/1989 | US4838594 Running and pulling tool |
| 06/13/1989 | CA1255584A1 Packer and service tool assembly |
| 06/06/1989 | US4836278 Apparatus for isolating a plurality of vertically spaced perforations in a well conduit |
| 05/31/1989 | EP0318343A2 Methods and apparatus for safely handling radioactive sources in measuring-while-drilling tools |
| 05/30/1989 | US4834198 Positive latch wire line core barrel apparatus |
| 05/30/1989 | US4834196 Well drilling tool |
| 05/23/1989 | US4832138 Device to control the locking of a boring corer |
| 05/23/1989 | US4832129 Multi-position tool and method for running and setting a packer |
| 05/23/1989 | CA1254507A1 Retrievable anchor assembly |
| 05/23/1989 | CA1254506A1 Wireline set/tubing retrievable bridge plug |
| 05/23/1989 | CA1254504A1 Well cementing apparatus |
| 05/23/1989 | CA1254503A1 Locking production seal assembly |
| 05/16/1989 | US4830113 Well pumping method and apparatus |
| 05/16/1989 | US4830107 Well test tool |
| 05/16/1989 | US4830104 Actuation indicator for downhole tools |
| 05/16/1989 | US4830103 Setting tool for mechanical packer |
| 05/09/1989 | US4828037 Liner hanger with retrievable ball valve seat |
| 05/09/1989 | US4828027 Apparatus for monitoring a parameter in a well |
| 05/09/1989 | US4828023 Mechanical latching device operated by dead weight and tension |
| 05/02/1989 | US4826357 Device for the internal occlusion of tubular foundation piles |
| 05/02/1989 | US4825954 Liner hanger with improved bite and method |
| 05/02/1989 | US4825946 Apparatus for monitoring a parameter in a well |
| 04/26/1989 | EP0313374A1 Well-logging method using a drill pipe conveyed logging system |
| 04/25/1989 | US4823881 Hydraulic setting tool |
| 04/25/1989 | US4823872 Downhole locking apparatus |
| 04/11/1989 | US4819760 Locking arm for well tool |
| 04/05/1989 | EP0310215A1 System and method for completing multiple wells from a single well bore |
| 04/05/1989 | EP0309445A1 A securing device. |
| 04/05/1989 | CN2035378U Mechanical wheel type well dredging machine |
| 04/04/1989 | US4817723 Apparatus for retaining axial mandrel movement relative to a cylindrical housing |
| 04/04/1989 | US4817716 Pipe connector and method of applying same |
| 03/28/1989 | US4815557 Down hole seismographic source |
| 03/28/1989 | US4815540 Method and apparatus for releasing a well perforating gun from a supporting tubing string |
| 03/21/1989 | US4814609 Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole |
| 03/21/1989 | US4813730 Retrieval device for a well control tool |
| 03/21/1989 | US4813486 Retractable slip assembly |