| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
|---|
| 07/01/1980 | CA1080822A1 Well testing downhole tool apparatus and method |
| 05/27/1980 | CA1078368A1 Downhole connector for use with drill string telemetering system |
| 04/29/1980 | US4200158 Fluid retarded accelerating jar with negative and positive pressure chambers |
| 04/08/1980 | US4196782 Temperature compensated sleeve valve hydraulic jar tool |
| 04/01/1980 | CA1074697A1 Method and apparatus for recovery of subsea well equipment |
| 03/04/1980 | US4191255 Method and apparatus for cutting and pulling tubular and associated well equipment submerged in a water covered area |
| 02/05/1980 | US4186807 Optional up-blow, down-blow jar tool |
| 02/05/1980 | CA1071093A1 Methods and apparatus for determining the stuck point of a conduit in a borehole |
| 01/29/1980 | US4185865 Releasable wireline overshot |
| 01/01/1980 | US4181344 Running tool |
| 01/01/1980 | US4181196 Method and apparatus for recovery of subsea well equipment |
| 01/01/1980 | US4181186 Sleeve valve hydraulic jar tool |
| 12/18/1979 | US4179002 Variable hydraulic resistor jarring tool |
| 09/11/1979 | CA1062155A1 Knock-out tool |
| 08/14/1979 | CA1060501A1 Fluid pressure article gripper |
| 07/31/1979 | US4162691 Tubular valve device |
| 07/31/1979 | CA1059435A2 Annular blowout preventer |
| 07/31/1979 | CA1059434A1 Well tubing drain |
| 07/17/1979 | US4161224 Fluid dump mechanism |
| 06/12/1979 | CA1056365A1 Well jar having a time delay section |
| 06/05/1979 | US4157199 Apparatus for retrieving a tubular member from a well |
| 05/01/1979 | CA1053656A1 Hydraulic jar |
| 03/06/1979 | US4142597 Mechanical detent jars |
| 01/23/1979 | CA1046933A1 Subsurface well apparatus having flexing means and method of using same |
| 12/19/1978 | US4130169 Downhole connector for use with drill string telemetering system |
| 11/28/1978 | US4127297 Releasable overshot |
| 11/14/1978 | US4125167 Big hole bit |
| 11/07/1978 | US4124245 Well tool |
| 10/31/1978 | US4123367 Method of reducing drag and rotating torque in the rotary drilling of oil and gas wells |
| 09/12/1978 | US4113038 Drilling jar |
| 09/05/1978 | US4111271 Hydraulic jarring device |
| 09/05/1978 | US4111262 Junk boot |
| 08/29/1978 | US4109736 Double acting jar |
| 08/22/1978 | US4108245 Well cable stop for stripping operations |
| 08/08/1978 | US4105082 Jarring tool |
| 08/08/1978 | US4105070 Methods for determining the stuck point of a conduit in a borehole |
| 08/08/1978 | US4104911 Methods and apparatus for determining the stuck point of a conduit in a borehole |
| 07/18/1978 | US4101157 Tool for fishing an object from a bore hole |
| 07/18/1978 | US4100968 Technique for running casing |
| 07/11/1978 | US4099561 Overshot cutter with flexible release cage |
| 07/04/1978 | US4098338 Jarring method and apparatus for well bore drilling |
| 06/06/1978 | US4093294 Releasable wireline spear |
| 04/25/1978 | US4085808 Self-driving and self-locking device for traversing channels and elongated structures |
| 04/18/1978 | US4084636 Hydraulic junk retriever |
| 03/28/1978 | US4081043 Hydraulic jars for bore hole drilling |
| 02/28/1978 | US4076086 Fishing jar for accommodation of excess tensile load |
| 01/10/1978 | US4067387 Subsurface well apparatus having flexing means and method of using same |
| 12/20/1977 | US4063603 Drilling fluid lubricant |
| 12/06/1977 | US4061389 Combination wire line releasable overshot and pull tool |
| 11/22/1977 | US4059167 Hydraulic fishing jar having tandem piston arrangement |
| 11/22/1977 | US4059164 Self-stabilizing drilling tool |
| 11/22/1977 | US4059155 Junk basket and method of removing foreign material from a well |
| 10/04/1977 | US4051899 Reset and pulling tool for manipulating well safety valve |
| 09/27/1977 | US4050731 Shifting apparatus |
| 09/13/1977 | US4047568 Method and apparatus for cutting and retrieving casing from a well bore |
| 08/23/1977 | US4043410 Anti-sticking tool for drill pipe |
| 08/16/1977 | US4042024 Subsurface well apparatus having flexing means and method of using same |
| 07/19/1977 | US4036312 Well jar |
| 07/12/1977 | US4035011 Soft set running tool |
| 07/05/1977 | US4033414 Method and apparatus for releasing a drill string held by differential pressure |
| 07/05/1977 | US4033413 Wire line well tool and method |
| 06/21/1977 | US4030745 Tool retriever for wells |
| 05/17/1977 | US4023847 Overshot tool |
| 05/17/1977 | US4023630 Well jar having a time delay section |
| 05/10/1977 | US4023092 Apparatus for sensing metal in wells |
| 04/26/1977 | US4019574 Subsurface well apparatus having flexing means and method of using same |
| 04/12/1977 | US4017113 Electrical cable overshot-grappling tool |
| 03/15/1977 | USRE29151 Repulsing clays on drill bits |
| 02/15/1977 | US4007798 Hydraulic jar |
| 02/15/1977 | US4007790 Back-off apparatus and method for retrieving pipe from wells |
| 01/25/1977 | US4004835 Overshot |
| 01/25/1977 | US4004643 Mechanical drilling jar |
| 01/11/1977 | US4002202 Fail-safe safety cut-off valve for a fluid well |
| 10/26/1976 | US3987858 Hydromechanical drilling jar |
| 10/05/1976 | US3983936 Method of and apparatus for cutting and recovering of submarine surface casing |
| 09/21/1976 | US3981360 Well tubing drain |
| 09/14/1976 | US3980146 Fishing tool energizer and polymer energy storage element embodied therein |
| 07/27/1976 | US3971543 Tool and kit for electrical fishing |
| 06/15/1976 | US3963081 Double acting mechanical jar |
| 06/01/1976 | US3960399 Setting and retrieval device for down-hole equipment |
| 05/11/1976 | US3955634 Hydraulic well jar |
| 05/11/1976 | US3955624 Safety valve for controlling flow in a flow conductor |
| 04/13/1976 | USRE28768 Jarring and bumping tool for use in oilfield drilling strings |
| 04/13/1976 | US3950021 Pulling and running tool |
| 04/13/1976 | US3949821 Drill string jarring and bumping tool with piston disconnect |
| 03/09/1976 | US3942833 Running tools |
| 03/09/1976 | US3942373 Well tool apparatus and method |
| 01/06/1976 | US3930679 Dry hole wire core barrel apparatus |