| 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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| 04/23/1991 | US5009264 Well production apparatus including pump means and thermal absorption means |
| 04/17/1991 | CA2022905A1 Packer arrangement |
| 04/16/1991 | US5007344 Dual firing system for a perforating gun |
| 04/11/1991 | WO1991005935A1 Hydraulically actuated releasable connector and method for setting oil well liner |
| 04/11/1991 | CA2067227A1 Hydraulically actuated releasable connector and method for setting oil well liner |
| 04/10/1991 | EP0421037A1 Hydraulic/torsion packoff installation tool and method of using same |
| 04/10/1991 | CN2074809U Extruding tool for well drilling mud pump |
| 04/09/1991 | US5005651 Downhole pump unseating apparatus and method |
| 04/09/1991 | CA1282688C Well suspension assembly |
| 04/07/1991 | CA2021371A1 Hydraulic/torsion packoff installation tool |
| 03/26/1991 | US5002131 Casing tensioning mechanism for a casing hanger |
| 03/26/1991 | CA1281998C Retrievable well bore tubular member packer arrangement and method |
| 03/20/1991 | EP0418056A1 Metal seal casing patch |
| 03/20/1991 | EP0417369A1 Method and apparatus for logging a well below a downhole pump |
| 03/19/1991 | US5000266 Hydraulic/torsion packoff installation tool |
| 03/05/1991 | US4997384 Wet connector |
| 03/05/1991 | US4997043 Well landing nipple and method of operation |
| 03/05/1991 | US4997042 Casing circulator and method |
| 03/05/1991 | US4997041 Method for selectively operating a wireline tool releasing device |
| 03/05/1991 | US4997038 Lock mandrel latch assembly |
| 02/27/1991 | EP0414334A1 Shock absorber for downhole tool |
| 02/27/1991 | CN1011827B Process and device for installing seismic sensors inside petroleum production well |
| 02/26/1991 | US4995458 Wear bushing retrieval tool |
| 02/19/1991 | US4993493 Retrievable landing method and assembly for a well bore |
| 02/12/1991 | US4991654 A sliding sleeve |
| 02/06/1991 | EP0411260A2 Equipment for a drill string with a side entry sub and emergency release |
| 02/05/1991 | US4989672 Packer locking apparatus |
| 01/29/1991 | US4987969 Method of coupling a seismic detector module to the wall of a borehole and a sonde for implementing the method |
| 01/29/1991 | CA1279571C Well tool lock mandrel and handling tools therefor |
| 01/23/1991 | EP0409547A2 Inflatable straddle packer |
| 01/23/1991 | EP0409446A1 Tool actuator |
| 01/22/1991 | US4986362 Running tool for use with reeled tubing and method of operating same |
| 01/22/1991 | US4986361 Well casing flotation device and method |
| 01/15/1991 | US4984636 Geothermal wellhead repair unit |
| 01/15/1991 | US4984634 Logging of subterranean wells using coiled tubing |
| 01/15/1991 | US4984632 Hydraulic release joint for tubing systems |
| 01/15/1991 | US4984631 System and plug for plugging a conduit |
| 01/15/1991 | US4984520 Enclosed perforating gun with expendable carrier |
| 01/02/1991 | EP0405734A2 Subsea hanger and running tool |
| 12/27/1990 | EP0404686A1 Pump apparatus including a firing head for use with a perforating gun on a tubing string |
| 12/27/1990 | EP0404669A1 Method and apparatus for conducting perforating operations in a well |
| 12/25/1990 | US4979568 Annulus fluid pressure operated testing valve |
| 12/25/1990 | US4979567 Method and apparatus for selective retraction of a tubing carried perforating gun |
| 12/25/1990 | US4979561 Positioning tool |
| 12/19/1990 | CA2018909A1 System and plug for plugging a conduit |
| 12/13/1990 | WO1990013764A3 Ball valve actuating member with force multiplier |
| 12/12/1990 | EP0402239A1 Device for extracting a liquid from a long pipe |
| 12/12/1990 | CN2067315U Wellhead distance adjuster |
| 12/11/1990 | US4976314 T-slot mandrel and kickover tool |
| 12/06/1990 | DE4017775A1 Verfahren und vorrichtung zum ausbau eines unterirdischen bohrloches Method and apparatus for the expansion of a subterranean well |
| 12/05/1990 | EP0400037A1 T-slot mandrel and kickover tool. |
| 12/02/1990 | CA2018054A1 Apparatus for completion of a subterranean well |
| 11/28/1990 | EP0399890A1 Apparatus for testing an oil well, and corresponding method |
| 11/28/1990 | EP0269638B1 A method and a device for deep hole drilling |
| 11/27/1990 | US4972908 Packer arrangement |
| 11/27/1990 | CA1276875C Liner screen tieback packer apparatus and method |
| 11/20/1990 | US4971153 Method of performing wireline perforating and pressure measurement using a pressure measurement assembly disconnected from a perforator |
| 11/20/1990 | US4971146 Downhole chemical cutting tool |
| 11/15/1990 | WO1990013764A2 Ball valve actuating member with force multiplier |
| 11/14/1990 | EP0396534A1 A device for geotechnical or geological sampling |
| 11/13/1990 | US4969519 Subsea hanger and running tool |
| 11/13/1990 | US4969515 Expendable devices for well lock system |
| 11/13/1990 | CA1276102C Subsurface stuffing box assembly |
| 11/06/1990 | US4967853 Wireline retrievable gauge system |
| 11/06/1990 | US4967844 Selectively operable ball valve and production packer system |
| 11/06/1990 | CA1275915C Running and pulling tool |
| 10/29/1990 | CA2015420A1 Down-hole decelerators |
| 10/28/1990 | CA2008152A1 Downhole pump |
| 10/23/1990 | US4964460 Shut-in tool |
| 10/16/1990 | US4962815 Inflatable straddle packer |
| 10/16/1990 | US4962813 Well tool locking system for staggered bore |
| 10/16/1990 | CA1275303C Wireline well test apparatus and method |
| 10/10/1990 | EP0391809A1 Method and apparatus for seismic prospecting in wells, especially in deviated wells |
| 10/10/1990 | EP0391541A1 Wear bushing retrieval tool |
| 10/10/1990 | CN1009967B Borehole seismic receiver |
| 10/04/1990 | CA2019130A1 Fluid control device for removal of well tubing from a well |
| 10/03/1990 | EP0390258A1 Grapple connection for coiled tubing |
| 10/03/1990 | EP0309445B1 A securing device |
| 10/03/1990 | CA2012534A1 Wear bushing retrieval tool |
| 10/02/1990 | CA1274766A1 Measurement and intervention process and device in a well |
| 09/26/1990 | EP0389362A1 Method and apparatus for production logging in eruptive wells |
| 09/25/1990 | CA1274617A1 Device for receiving acoustic waves in a well |
| 09/25/1990 | CA1274470A1 No-turn tool |
| 09/18/1990 | US4957162 Device for anchoring a probe in a well by spreading mobile anchorage arms |
| 09/18/1990 | CA1274171A1 Apparatus for enhanced oil recovery |
| 09/16/1990 | CA2011923A1 Hydraulically actuated liner hanger |
| 09/11/1990 | CA1274014A1 Borehole seismic receiver |
| 09/11/1990 | CA1273868A1 Dual bore well treating tool |
| 09/05/1990 | CN2061603U Tipping setting or fishing apparatus for hydraulic piston pump |
| 09/04/1990 | US4953636 Electrical conductor arrangements for pipe system |
| 09/04/1990 | US4953617 Apparatus for setting and retrieving a bridge plug from a subterranean well |
| 08/29/1990 | EP0204823B1 Side pocket mandrel |
| 08/28/1990 | US4951746 Latching seal unit |
| 08/28/1990 | CA1273288A1 Safety valve for an oil well, and tooling for operating said valve |
| 08/28/1990 | CA1273286A1 Device for inserting a tool or an apparatus in a conduit for downhole exploitation of autonomous hydraulic pumps, in use for production through a tubing |
| 08/22/1990 | EP0383494A2 Retrievable bridge plug and packer apparatus |
| 08/21/1990 | US4949793 Method and apparatus for completion of a well |
| 08/21/1990 | US4949792 Packer assembly and means for activating same only in smaller diameter well conduit |
| 08/21/1990 | US4949791 Method and apparatus for securing and releasing continuous tubing in a subterranean well |
| 08/21/1990 | US4949788 Well completions using casing valves |