| 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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| 08/21/1979 | CA1060790A1 Negative energy power supply |
| 08/14/1979 | USRE30070 Apparatus for treating wells |
| 08/07/1979 | US4163477 Method and apparatus for closing underwater wells |
| 07/10/1979 | US4160478 Well tools |
| 06/19/1979 | US4158389 Chemical cutting apparatus and method for use in wells |
| 06/19/1979 | US4158388 Method of and apparatus for squeeze cementing in boreholes |
| 05/16/1979 | EP0001893A1 Internal tube cutters |
| 05/01/1979 | CA1053576A1 Method and device for extinguishing fires in oil wells |
| 05/01/1979 | CA1053574A1 Method and apparatus for a subsea master valve |
| 03/20/1979 | US4144936 Down hole milling or grinding system |
| 03/06/1979 | US4142429 Internal tube cutter |
| 01/23/1979 | US4135547 Quick disengaging valve actuator |
| 01/09/1979 | US4133342 Method of replacing seals in a well ram type blow out preventer |
| 01/02/1979 | US4132267 Pipe shearing ram assembly for blowout preventer |
| 01/02/1979 | US4132266 Pipe shearing ram assembly for blowout preventer |
| 01/02/1979 | US4132265 Pipe shearing ram assembly for blowout preventer |
| 11/14/1978 | US4125161 Chemical cutting apparatus and method for use in wells |
| 10/10/1978 | US4119151 Casing slotter |
| 09/26/1978 | US4116130 Methods and apparatus for severing tubular members |
| 09/19/1978 | CA1038634A1 Subsea structure |
| 08/15/1978 | US4106561 Well casing perforator |
| 07/11/1978 | US4099561 Overshot cutter with flexible release cage |
| 06/20/1978 | US4095421 Subsea energy power supply |
| 03/28/1978 | US4081027 Shear rams for hydrogen sulfide service |
| 01/17/1978 | US4068711 Casing cutter |
| 09/13/1977 | US4047568 Method and apparatus for cutting and retrieving casing from a well bore |
| 08/23/1977 | US4043389 Ram-shear and slip device for well pipe |
| 08/16/1977 | US4042019 Wireline actuated tubing cutter |
| 08/02/1977 | US4039025 Apparatus for anchoring an offshore structure |
| 04/12/1977 | US4016728 Device for severing underwater cables |
| 03/01/1977 | US4009753 Subsea master valve apparatus |
| 01/18/1977 | US4003433 Method for cutting pipe |
| 01/18/1977 | US4003430 Apparatus for the replacement of seals in a well ram type blow out preventer |
| 11/23/1976 | US3993137 Method and device for extinguishing fires in oil wells |
| 10/26/1976 | US3987638 Subsea structure and method for installing the structure and recovering the structure from the sea floor |
| 10/05/1976 | US3983936 Method of and apparatus for cutting and recovering of submarine surface casing |
| 08/31/1976 | US3977076 Internal pipe cutting tool |
| 08/10/1976 | US3973631 Method and device for extinguishing fires in oil wells |
| 07/06/1976 | US3967681 Repair of cement sheath around well casing |
| 07/06/1976 | US3967647 Subsea control valve apparatus |
| 06/01/1976 | US3960448 Holographic instrument for measuring stress in a borehole wall |
| 05/11/1976 | US3955623 Subsea control valve apparatus |
| 04/06/1976 | US3948321 Liner and reinforcing swage for conduit in a wellbore and method and apparatus for setting same |
| 03/30/1976 | US3946806 Ram-type blowout preventer |