| 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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| 03/15/1989 | EP0307266A1 Method and apparatus for driving specialised intervention equipment into a borehole with at least one section strongly inclined relative to the vertical |
| 03/14/1989 | US4811814 Measuring device for a seismic profile within a well-bore |
| 03/14/1989 | US4811798 Drilling motor deviation tool |
| 03/14/1989 | US4811785 No-turn tool |
| 02/28/1989 | US4807717 Method of loggging an inclined wellbore |
| 02/28/1989 | US4807704 System and method for providing multiple wells from a single wellbore |
| 02/21/1989 | US4805699 Method and apparatus for setting, unsetting, and retrieving a packer or bridge plug from a subterranean well |
| 02/21/1989 | US4805696 Hydraulic release tubing seal divider |
| 02/21/1989 | CA1250340A1 Method and apparatus for uniformly heating long subterranean intervals at high temperature |
| 02/21/1989 | CA1250228A1 Liner hanger with brass packer |
| 02/15/1989 | EP0303536A1 A method of coupling a seismic detector module to the wall of a borehole, and a sonde for implementing the method |
| 02/14/1989 | US4804044 Perforating gun firing tool and method of operation |
| 02/14/1989 | US4804042 Bottom hole shut-in tool |
| 02/14/1989 | CA1249966A1 Retrievable landing method and assembly for a well bore |
| 02/07/1989 | US4802359 Tool for measuring pressure in an oil well |
| 02/01/1989 | EP0301734A2 Downhole circulation valve |
| 01/25/1989 | CN2031440U Telecontrol tungsten alloy weighing rod |
| 01/24/1989 | US4799554 Pressure actuated cleaning tool |
| 01/24/1989 | US4799546 Drill pipe conveyed logging system |
| 01/11/1989 | EP0298683A2 Downhole lock assembly |
| 01/10/1989 | US4796707 Apparatus for setting, unsetting, and retrieving a packer or bridge plug from a subterranean well |
| 01/10/1989 | US4796706 Liner setting apparatus and method for use in well casings |
| 01/10/1989 | US4796699 Well tool control system and method |
| 01/10/1989 | US4796698 Landing nipple and plug |
| 01/05/1989 | DE3720573A1 Tool which can be releasably inserted in a borehole casing string |
| 01/04/1989 | EP0297899A1 Apparatus and method for releasing a side entry sub |
| 01/03/1989 | US4794989 Well completion method and apparatus |
| 12/28/1988 | EP0296788A2 Electrical conductor arrangements for pipe system |
| 12/28/1988 | EP0296209A1 Method and device for taking measurements and/or carrying out interventions in a substantially inclined well portion and its application to the achievement of seismic profiles. |
| 12/28/1988 | EP0296207A1 Method and device for taking measurements and/or carrying out interventions in a well subjected to a hydraulic compression. |
| 12/27/1988 | US4793411 Retrievable gravel packer and retrieving tool |
| 12/21/1988 | EP0295291A1 System for moving a set of instruments and measurements and/or interventions method in a well. |
| 12/20/1988 | US4792802 Telemetry system for borehole drilling |
| 12/20/1988 | CA1246990A1 Hydraulically activated liner setting device |
| 12/15/1988 | WO1988009863A1 A device for geotechnical or geological sampling |
| 12/14/1988 | EP0294440A1 Probe and its multidirectional anchoring device in a well. |
| 12/14/1988 | CN87210760U Device for pour drilling mud with casing pipes |
| 12/13/1988 | US4790380 For monitoring well fluid characteristics |
| 12/13/1988 | US4790377 Side entry sub well logging apparatus and method |
| 12/13/1988 | CA1246441A1 Slip releasing apparatus |
| 12/07/1988 | EP0294264A1 Locking mechanism for locking a well tool in a well conduit |
| 12/07/1988 | EP0294252A1 Equipment for a drill string with a side entry sub and method for its use |
| 12/06/1988 | US4789029 For sealing the annulus |
| 12/01/1988 | DE3717024A1 Device for drilling boreholes and injecting stabilising material |
| 11/30/1988 | EP0293355A1 Device to control the bolting of a core drilling machine |
| 11/29/1988 | CA1245548A1 Tubing drain valve useful with heavy, sand-bearing oil |
| 11/24/1988 | DE3715900A1 Separating device for casing strings of oil production wells |
| 11/17/1988 | EP0291143A2 Subsea riser for multiple bore wells |
| 11/17/1988 | EP0291005A2 Method and apparatus for logging deep wells which are curved or deviate in a horizontal direction |
| 11/15/1988 | US4784238 Large diameter borehole apparatus |
| 11/15/1988 | US4784226 Drillable bridge plug |
| 11/15/1988 | CA1244757A1 Well apparatus |
| 11/09/1988 | EP0290114A2 Tubing packer |
| 11/08/1988 | US4782897 Multiple indexing J-slot for model E SRO valve |
| 11/02/1988 | EP0289103A2 Pipe connector and method of applying same |
| 11/01/1988 | US4781607 Electrical connector assembly |
| 11/01/1988 | US4781250 For cleaning flow conductors |
| 11/01/1988 | CA1243942A1 Surface controlled subsurface safety valve |
| 10/26/1988 | EP0288239A2 Perforating gun firing tool |
| 10/12/1988 | EP0286500A1 Apparatus for controlled directional drilling, and process for controlling the apparatus |
| 10/11/1988 | US4776401 Foot valve for pumping wells |
| 10/11/1988 | US4776394 Hydraulic stabilizer for bore hole tool |
| 10/11/1988 | US4776393 Perforating gun automatic release mechanism |
| 10/11/1988 | CA1242972A1 Slip and slip assembly for well tools |
| 10/11/1988 | CA1242969A1 Injection control device for subterranean well conduit |
| 10/05/1988 | EP0284780A2 Production tubing string for deep wells |
| 10/04/1988 | US4775009 Process and device for installing seismic sensors inside a petroleum production well |
| 09/27/1988 | US4773478 Hydraulic setting tool |
| 09/27/1988 | US4773477 For connecting to an inner/outer tubular member to/from each other |
| 09/21/1988 | EP0232268B1 Device for controlling the locking of a sampling tube |
| 09/21/1988 | CN88101914A Methods and apparatus for safely meaasuring downhole conditions and formation characteristics while drilling borehole |
| 09/20/1988 | US4771827 Automatic drop-off device for perforating guns |
| 09/14/1988 | EP0282402A2 Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole |
| 09/14/1988 | EP0281737A1 Device for placing loads in cavities |
| 09/13/1988 | US4770247 Subsea riser for multiple bore wells |
| 09/13/1988 | US4770244 Downhole fixed choke for steam injection |
| 09/13/1988 | CA1241916A1 Plug container |
| 08/31/1988 | EP0280294A2 Test drill string for deep wells |
| 08/30/1988 | US4767145 For engaging an internal fishing neck |
| 08/23/1988 | US4765403 Apparatus for placing and removing well flow control devices |
| 08/23/1988 | US4765402 Self-locating seal assembly |
| 08/17/1988 | EP0278730A2 Hydraulic stabilizer for bore hole tool |
| 08/10/1988 | CN88100528A Releasing installation of bridge plug device and ash dumping barrel |
| 08/09/1988 | US4762177 Slip gripping mechanism with floating cone segments |
| 08/02/1988 | US4760884 Air chamber actuated dual tubing release assembly |
| 08/02/1988 | US4760880 Combination anchor |
| 07/27/1988 | EP0263148A4 Downhole electromagnetic seismic source. |
| 07/26/1988 | US4759410 Side pocket mandrel having forged indentations |
| 07/21/1988 | DE3700717A1 Borehole plug with pressure-restrained ring expanding element |
| 07/19/1988 | US4757859 Apparatus for monitoring a parameter in a well |
| 07/14/1988 | WO1988005111A1 Method and device for taking measurements and/or carrying out interventions in a substantially inclined well portion and its application to the achievement of seismic profiles |
| 07/14/1988 | WO1988005110A1 Method and device for taking measurements and/or carrying out interventions in a well subjected to a hydraulic compression |
| 07/14/1988 | WO1988005109A1 System for moving a set of instruments and measurements and/or interventions method in a well |
| 07/14/1988 | WO1988005108A1 Probe and its multidirectional anchoring device in a well |
| 07/14/1988 | DE3644723A1 Method and apparatus for recovering the inner pipe of a core-drilling appliance |
| 07/12/1988 | US4756372 Tool for closing a well tubing |
| 07/12/1988 | US4756365 For use in a cased wellbore |
| 07/12/1988 | US4756363 Apparatus for releasing a perforation gun |
| 07/05/1988 | CA1238851A1 Device for anchoring a probe in a well by means of spreading grippers |
| 07/05/1988 | CA1238849A1 Method and device enabling the taking of measurements and/or the undertaking of operations within a well |