| 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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| 08/08/1978 | US4105279 Removable downhole measuring instruments with electrical connection to surface |
| 08/08/1978 | US4105071 Methods and apparatus for determining the stuck point of a conduit in a borehole |
| 08/08/1978 | US4105070 Methods for determining the stuck point of a conduit in a borehole |
| 08/08/1978 | US4105069 Gravel pack liner assembly and selective opening sleeve positioner assembly for use therewith |
| 08/08/1978 | US4104911 Methods and apparatus for determining the stuck point of a conduit in a borehole |
| 08/01/1978 | US4103740 Well tool with a pawl |
| 07/18/1978 | US4101157 Tool for fishing an object from a bore hole |
| 07/18/1978 | US4100972 Displacement hammer apparatus for sinking and lining boreholes |
| 07/04/1978 | US4098342 Method and apparatus for maintaining electric cable inside drill pipe |
| 07/04/1978 | US4098335 Dual string tubing hanger and running and setting tool therefor |
| 07/04/1978 | US4098334 Dual string tubing hanger |
| 06/27/1978 | US4096913 Hydraulically set liner hanger and running tool with backup mechanical setting means |
| 06/13/1978 | US4094360 Self-locking mule shoe |
| 05/23/1978 | US4090573 Wireline sealing apparatus and method for use with a drill string |
| 05/16/1978 | US4089548 Hydraulic releasing tool with plug |
| 05/16/1978 | US4089371 Production shoe |
| 04/25/1978 | US4085808 Self-driving and self-locking device for traversing channels and elongated structures |
| 04/25/1978 | US4085804 Well tubing anchor with automatic slip release |
| 04/11/1978 | US4083405 Well drilling method and apparatus therefor |
| 04/04/1978 | US4082144 Method and apparatus for running and retrieving logging instruments in highly deviated well bores |
| 03/14/1978 | US4078810 Piston type seal unit for wells |
| 03/07/1978 | US4077472 Well flow control system and method |
| 02/21/1978 | US4074762 Wireline running tool |
| 01/31/1978 | US4071086 Apparatus for pulling tools into a wellbore |
| 01/31/1978 | US4071084 Well packer |
| 01/10/1978 | US4067388 Hydraulic operated casing hanger running tool |
| 01/10/1978 | US4067387 Subsurface well apparatus having flexing means and method of using same |
| 01/10/1978 | US4067358 Indexing automatic fill-up float valve |
| 01/10/1978 | US4067062 Hydraulic set tubing hanger |
| 01/03/1978 | US4066128 Well flow control apparatus and method |
| 12/27/1977 | US4064939 Method and apparatus for running and retrieving logging instruments in highly deviated well bores |
| 12/20/1977 | US4063592 System for logging highly deviated earth boreholes utilizing auxiliary sinker bar assembly |
| 12/13/1977 | US4062403 Pump-down sand washing tool |
| 11/29/1977 | US4060131 Mechanically set liner hanger and running tool |
| 11/22/1977 | US4059150 Anchoring assembly |
| 11/15/1977 | USRE29471 Oil well testing apparatus |
| 11/15/1977 | US4058166 Well setting tool |
| 11/15/1977 | US4058162 Well tool adapted to be locked within and sealed with respect to the bore of the well conduit |
| 11/01/1977 | US4056145 Hydraulic holddown for well packer stinger |
| 11/01/1977 | US4056004 Multiple arm pad instrument for logging highly deviated boreholes |
| 10/04/1977 | US4051897 Well testing tool |
| 10/04/1977 | US4051896 Well bore liner hanger |
| 10/04/1977 | US4051895 Positioning tool |
| 09/20/1977 | US4049055 Gravel pack method, retrievable well packer and gravel pack apparatus |
| 09/13/1977 | US4047568 Method and apparatus for cutting and retrieving casing from a well bore |
| 09/13/1977 | US4047565 Well tool |
| 08/30/1977 | US4044827 Apparatus for treating wells |
| 08/30/1977 | US4044826 Retrievable well packers |
| 08/23/1977 | US4043392 Well system |
| 08/23/1977 | US4043390 Anchoring device and running tool for downhole apparatus |
| 08/16/1977 | US4042024 Subsurface well apparatus having flexing means and method of using same |
| 08/16/1977 | US4042019 Wireline actuated tubing cutter |
| 08/09/1977 | US4040481 Arrangement for positioning a member in a receiving section of a side pocket mandrel |
| 08/02/1977 | US4039027 Circumferential centralizer |
| 08/02/1977 | US4039026 Kickover tool |
| 07/19/1977 | US4036296 Subsurface well apparatus |
| 07/12/1977 | US4035011 Soft set running tool |
| 07/12/1977 | US4034806 Tubing side pocket mandrel |
| 07/05/1977 | US4033409 Well tubing mandrel with orienting sleeve with trash relieving slot |
| 06/28/1977 | US4031954 Flow valve installation and removal apparatus |
| 06/28/1977 | US4031750 Apparatus for logging inclined earth boreholes |
| 06/21/1977 | US4030547 Apparatus for cryothermal fracturing of rock formations |
| 06/21/1977 | US4030543 Well tubing mandrel with combination guard, guide and latch arrangement |
| 06/14/1977 | US4029147 Gripping member for well packer |
| 06/07/1977 | US4027730 Seal assembly for fluid injection pump-down tools |
| 05/31/1977 | US4026363 Apparatus and method for performing a desired operation at a specified location in a well |
| 05/17/1977 | US4023620 No-go bomb hanger |
| 05/10/1977 | US4022281 Method and apparatus for orienting equipment in a well |
| 04/26/1977 | US4019574 Subsurface well apparatus having flexing means and method of using same |
| 04/19/1977 | US4018277 Selective bomb hanger |
| 04/19/1977 | US4018275 Anchoring device for well tools |
| 04/19/1977 | US4018274 Well packer |
| 04/05/1977 | US4015662 Well tool which changes reciprocating movement to rotary motion |
| 04/05/1977 | US4015660 Subsea oil and gas production manifold system |
| 03/08/1977 | US4010803 Method for cryothermal fracturing of rock formations |
| 02/22/1977 | US4008759 Oil well tool with packing means |
| 02/15/1977 | US4007783 Well plug with anchor means |
| 02/08/1977 | US4006777 Free floating carrier for deep well instruments |
| 01/18/1977 | US4003430 Apparatus for the replacement of seals in a well ram type blow out preventer |
| 01/11/1977 | US4002203 Well installation |
| 12/28/1976 | US3999605 Well tool for setting and supporting liners |
| 12/28/1976 | US3999604 Rotation release two-way well casing hanger |
| 12/14/1976 | US3997003 Time delay nipple locator and/or decelerator for pump down well tool string operations |
| 11/30/1976 | US3994339 Side pocket mandrel |
| 11/23/1976 | US3993128 Well tool for setting and supporting liners |
| 11/16/1976 | US3991826 Retrievable well packer and anchor with latch release |
| 11/09/1976 | US3990510 Releasable well anchor tool |
| 09/21/1976 | US3981188 Method and apparatus for testing wells |
| 09/07/1976 | US3978921 Apparatus for cryothermal fracturing of rock formations |
| 08/31/1976 | US3977473 Well tubing anchor with automatic delay and method of installation in a well |
| 08/24/1976 | US3976139 Anchoring for tensioning casing in thermal wells |
| 08/24/1976 | US3976133 Retrievable well packer |
| 07/20/1976 | US3969937 Method and apparatus for testing wells |
| 07/06/1976 | US3967680 Method and apparatus for actuating a downhole device carried by a pipe string |
| 06/29/1976 | US3965979 Orienting system for a kickover tool |
| 06/15/1976 | US3963074 Locking device for use in well tubing |
| 05/25/1976 | US3958641 Self-decentralized hydra-jet tool |
| 05/25/1976 | US3958633 Flapper-type subsurface safety valve |
| 05/18/1976 | US3957119 Pump down method |
| 05/18/1976 | US3957118 Cable system for use in a pipe string and method for installing and using the same |