| Patents for E21B 29 - Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground (5,744) |
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| 07/02/1985 | US4526232 Method of replacing a corroded well conductor in an offshore platform |
| 06/19/1985 | EP0145456A2 Shearing type blowout preventer |
| 06/18/1985 | US4524324 Downhole instrument including a flexible probe which can travel freely around bends in a borehole |
| 06/18/1985 | US4523639 Ram type blowout preventers |
| 05/28/1985 | US4519577 Flow controlling apparatus |
| 05/28/1985 | US4519575 Valves and valve actuators |
| 05/14/1985 | US4516598 Well safety valve |
| 04/23/1985 | US4512411 Fluid actuated energy charged well service line cutter |
| 04/16/1985 | US4511002 Oil well tubing head system |
| 04/02/1985 | US4508313 Valves |
| 03/19/1985 | CA1184039A2 Methods, apparatus and pyrotechnic compositions for severing conduits |
| 03/12/1985 | CA1183772A1 Self powered downhole tool anchor |
| 02/26/1985 | US4501327 Split casing block-off for gas or water in oil drilling |
| 02/12/1985 | US4498543 Method for placing a liner in a pressurized well |
| 01/29/1985 | CA1181679A1 Casing perforation method and apparatus |
| 01/22/1985 | US4494601 Downhole chemical cutting tool |
| 11/20/1984 | US4483399 Method of deep drilling |
| 11/14/1984 | EP0124601A1 Safety valve apparatus and method |
| 10/16/1984 | US4476935 Safety valve apparatus and method |
| 10/02/1984 | CA1175344A1 Downhole chemical cutting tool |
| 06/05/1984 | CA1168573A1 Well casing cutter |
| 05/29/1984 | US4450857 Device for tapping and plugging a fluid conductor |
| 05/15/1984 | CA1167370A1 Methods, apparatus and pyrotechnic compositions for severing conduits |
| 05/10/1984 | WO1984001799A1 Safety valve apparatus and method |
| 05/08/1984 | US4446920 Method and apparatus for perforating or cutting with a solid fueled gas mixture |
| 04/17/1984 | US4442896 Treatment of underground beds |
| 04/17/1984 | US4442891 Cutters |
| 03/13/1984 | US4436154 Method for controlling subsurface blowout |
| 02/07/1984 | US4429741 Self powered downhole tool anchor |
| 01/31/1984 | US4428430 Method for increasing fluid flow circulation |
| 01/24/1984 | US4427059 Wire line cutter apparatus |
| 01/03/1984 | US4424086 Pyrotechnic compositions for severing conduits |
| 12/13/1983 | US4420042 Method for cutting and replacing tubing without killing well |
| 11/29/1983 | US4417625 Annulus plugging |
| 11/15/1983 | US4415029 Downhole well tool and anchoring assembly |
| 08/17/1983 | EP0085989A2 Downhole instrument and methods of manufacturing and using the same |
| 08/09/1983 | US4397355 Whipstock setting method and apparatus |
| 08/09/1983 | CA1151731A1 Apparatus and method for casing inspection |
| 06/28/1983 | US4389765 Piling removal |
| 06/28/1983 | CA1148852A1 Chemical cutting apparatus |
| 05/31/1983 | CA1147255A1 Hydra-jet slotting tool |
| 05/10/1983 | CA1146065A1 Methods and apparatus for severing conduits |
| 04/05/1983 | US4378844 Explosive cutting system |
| 02/08/1983 | US4372333 Valve actuating apparatus and method |
| 02/01/1983 | CA1140454A1 Wellhead shearing apparatus |
| 01/25/1983 | US4369845 Oil well blow-out control |
| 11/30/1982 | CA1136544A1 Blowout preventer shearing and sealing rams |
| 10/19/1982 | US4354433 Apparatus for cutting pipe |
| 10/05/1982 | US4352397 Methods, apparatus and pyrotechnic compositions for severing conduits |
| 09/22/1982 | EP0060715A1 Pipe sealing apparatus and jack |
| 09/07/1982 | US4347898 Shear ram blowout preventer |
| 08/31/1982 | US4346761 Hydra-jet slotting tool |
| 08/24/1982 | US4345646 Apparatus for chemical cutting |
| 07/27/1982 | US4341264 Wellhead shearing apparatus |
| 07/14/1982 | EP0055760A1 Method of converting a cable in the ground into a closed guiding track for insertion of new conductors. |
| 07/13/1982 | US4339008 Well notching tool |
| 07/13/1982 | US4339000 Method and apparatus for a bridge plug anchor assembly for a subsurface well |
| 04/13/1982 | CA1121721A1 Device for perforating water well pipe casings |
| 04/06/1982 | US4323117 Method and means for emergency shearing and sealing of well casing |
| 03/16/1982 | US4319393 Methods of forming swages for joining two small tubes |
| 02/16/1982 | US4315797 Chemical pipe cutter with exponential spacing between reactant stages |
| 02/04/1982 | WO1982000388A1 Method of converting a cable in the ground into a closed guiding track for insertion of new conductors |
| 02/02/1982 | US4313496 Wellhead shearing apparatus |
| 01/12/1982 | US4309891 Double action, self-contained swages for joining two small tubes |
| 01/12/1982 | CA1116073A1 Methods and apparatus for severing conduits |
| 12/22/1981 | US4306622 Apparatus and method for down-hole retrieval of pumping equipment |
| 11/03/1981 | US4298063 Methods and apparatus for severing conduits |
| 10/20/1981 | CA1110967A1 Well cementing/plug drilling apparatus and improved cementing and drilling process |
| 10/20/1981 | CA1110966A1 Pump down wipe plug and cementing/drilling process |
| 09/29/1981 | US4292589 Determining defects in oil well casings |
| 09/22/1981 | US4290486 Methods and apparatus for severing conduits |
| 09/16/1981 | EP0035857A2 Annulus plugging |
| 08/18/1981 | CA1107193A1 Method and apparatus for severing tubing |
| 07/14/1981 | US4278362 Method for lifting an immersed device and returning it into position, and for carrying out said method |
| 07/14/1981 | US4278127 Apparatus for retrieving drill collars |
| 07/07/1981 | US4276931 Junk basket |
| 06/30/1981 | US4275786 Apparatus for selectively coupling cables to well tools |
| 05/12/1981 | US4266621 Well casing window mill |
| 02/17/1981 | US4250960 Chemical cutting apparatus |
| 01/27/1981 | CA1094448A1 Actuator module for wireline cutting safety valve |
| 12/23/1980 | US4240503 Blowout preventer shearing and sealing rams |
| 12/09/1980 | US4237972 Well bore apparatus adapted for being releasably coupled to suspension cables |
| 11/26/1980 | EP0019091A1 Method and apparatus for pipe inspection |
| 10/14/1980 | CA1087519A1 Well tools |
| 09/30/1980 | US4224989 Method of dynamically killing a well blowout |
| 09/02/1980 | US4220034 Double action, self-contained swage |
| 08/05/1980 | US4215749 Gate valve for shearing workover lines to permit shutting in of a well |
| 05/20/1980 | CA1077831A1 Chemical cutting apparatus and method for use in wells |
| 04/22/1980 | US4199131 Actuator module for wireline cutting safety valve |
| 04/15/1980 | CA1075595A1 Chemical cutting apparatus and method for use in wells |
| 04/01/1980 | CA1074697A1 Method and apparatus for recovery of subsea well equipment |
| 03/18/1980 | CA1073808A1 Well casing window mill |
| 03/04/1980 | US4191255 Method and apparatus for cutting and pulling tubular and associated well equipment submerged in a water covered area |
| 02/26/1980 | US4190112 Pump down wipe plug and cementing/drilling process |
| 02/26/1980 | US4190111 Well cementing/plug drilling apparatus and improved cementing and drilling process |
| 01/22/1980 | US4184430 Method and apparatus for severing tubing |
| 01/01/1980 | US4181196 Method and apparatus for recovery of subsea well equipment |
| 01/01/1980 | CA1069044A Shear rams for hydrogen sulfide service |
| 12/25/1979 | US4180131 Chemical cutting apparatus for use in wells |
| 09/25/1979 | CA1063085A1 Valve actuator having a continuously charged accumulator |