| 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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| 03/22/1988 | US4732222 Ram boring machine with impact blade piston |
| 03/22/1988 | CA1234350A1 Pipe cutting apparatus |
| 03/15/1988 | CA1234042A1 Gun firing head |
| 03/09/1988 | EP0259170A2 Plug for use in wellbores |
| 03/02/1988 | EP0257944A2 Milling tool |
| 03/02/1988 | EP0257943A2 Apparatus having a radially movable member |
| 02/09/1988 | US4724105 Annular shaped charge technique |
| 02/09/1988 | US4723873 Method and device for preparing an existing buried conduit for replacement by a new conduit |
| 01/19/1988 | CA1231641A1 Blowout preventer stacks and method of tensioning stack tie rods |
| 01/12/1988 | US4718496 For isolating a damaged section of casing, isolating a formation |
| 01/05/1988 | US4717290 Milling tool |
| 01/05/1988 | US4716970 Oil or gas well workover technique |
| 01/05/1988 | CA1230979A1 Rotary cutter for cable following apparatus |
| 12/29/1987 | US4715128 Curvature probe and method |
| 12/08/1987 | US4711300 Downhole cementing tool assembly |
| 12/01/1987 | US4710074 Casing mill |
| 12/01/1987 | US4709761 Well conduit joint sealing system |
| 11/17/1987 | US4706753 Method and device for conveying chemicals through borehole |
| 11/10/1987 | US4705112 Method and apparatus for effecting an opening in a well casing |
| 11/10/1987 | US4705111 Tubing assembly |
| 11/03/1987 | US4703807 In a well |
| 09/29/1987 | US4696502 Dual string packer mill |
| 09/15/1987 | US4693327 Earth well drilling apparatus |
| 09/02/1987 | EP0234697A2 Cutter |
| 08/25/1987 | US4688641 Well packer with releasable head and method of releasing |
| 08/25/1987 | US4688640 Abandoning offshore well |
| 08/12/1987 | EP0231989A2 Milling tool for cutting well casing |
| 08/11/1987 | US4685521 Well apparatus |
| 08/11/1987 | CA1225326A1 Safety valve, in particular for closing an oil well |
| 07/21/1987 | US4681133 Rotatable ball valve apparatus and method |
| 07/08/1987 | CN85109237A Device and method for sectioning and recovery of seabed surface casing |
| 07/07/1987 | US4678037 Method and apparatus for completing a plurality of zones in a wellbore |
| 07/01/1987 | EP0227456A2 Earth well drilling apparatus |
| 06/30/1987 | CA1223520A1 Safety valve apparatus and method |
| 06/25/1987 | DE3543295A1 Fishing tool for removing iron-bearing chips from deep-drill holes |
| 06/16/1987 | CA1222944A1 Blowout preventer, shear ram, shear blade and seal therefor |
| 06/09/1987 | US4671312 Wireline cutting actuator and valve |
| 05/12/1987 | CA1221623A1 Shear ram assembly |
| 04/28/1987 | US4660863 Casing patch seal |
| 04/28/1987 | US4660635 Equipment for a pipe string such as a drill-pipe string, comprising a side entry connection for passing a cable |
| 04/11/1987 | US4819728 Cutting an object within an earth bore |
| 04/01/1987 | EP0216100A2 Boring ram with a piston-actuated percussion cutter |
| 04/01/1987 | CN86105839A Casing patch seal |
| 03/31/1987 | US4653776 Umbilical safety joint |
| 03/24/1987 | US4651970 Valve actuator with auxiliary energy storage means |
| 03/24/1987 | US4651828 Safety valve in particular for closing an oil well |
| 03/04/1987 | EP0212957A2 Packer mill |
| 03/04/1987 | EP0212811A1 Explosion compensator |
| 03/04/1987 | EP0211825A1 Device to fill in and glue all kinds of depressions in inaccessible pipe conduits. |
| 03/03/1987 | US4646826 Well string cutting apparatus |
| 03/03/1987 | US4646825 Blowout preventer, shear ram, shear blade and seal therefor |
| 02/25/1987 | EP0211515A2 Apparatus for severing a wellhead |
| 02/04/1987 | EP0210758A2 Apparatus for cutting a drill collar |
| 02/04/1987 | CN86105631A Apparatus for severing a wellhead |
| 02/03/1987 | US4640163 Umbilical safety joint |
| 01/28/1987 | EP0209686A2 Process and device for pretreating an old underground pipeline for replacement by a new one |
| 01/21/1987 | CN86105695A Apparatus for cutting a drill collar |
| 01/20/1987 | CA1216922A1 Finding distance to blowout using wellbore acoustic measurements |
| 01/07/1987 | CN86104635A 爆炸补偿器 Explosion compensator |
| 12/30/1986 | EP0206909A1 Wire line cutting nipple for drilling, production, logging or performing operations in wells |
| 12/23/1986 | US4630676 Remotely controlled hydraulic cutter apparatus |
| 11/20/1986 | EP0202151A1 Apparatus for a drill pipe or the like, comprising a side entry SUB for a cable |
| 11/04/1986 | US4620591 Chemical cutting apparatus having selective pressure bleed-off |
| 10/28/1986 | US4619318 Chemical cutting method and apparatus |
| 10/21/1986 | CA1212899A1 Shearing type blowout preventer |
| 09/30/1986 | CA1212043A1 Safety shear apparatus and method for production wells |
| 09/23/1986 | US4613394 Staged chemical pipe cutter |
| 09/23/1986 | US4612983 Shear type gate valve |
| 08/28/1986 | WO1986004975A1 Device to fill in and glue all kinds of depressions in inaccessible pipe conduits |
| 08/26/1986 | CA1210449A1 Downhole instrument and methods of manufacturing and using the same |
| 08/05/1986 | CA1209032A1 Hydraulically operated valves |
| 07/29/1986 | US4602796 Well conduit joint sealing system |
| 07/08/1986 | US4598769 Pipe cutting apparatus |
| 07/08/1986 | CA1207227A1 Ram type blowout preventers |
| 06/10/1986 | US4593772 Rotary cutter for cable following apparatus |
| 04/15/1986 | US4582293 Hydraulically operated valves |
| 04/15/1986 | CA1203222A1 Valves and valve actuators |
| 04/08/1986 | US4580628 Blowout preventer stacks and method of tensioning stack tie rods |
| 04/08/1986 | US4580626 Blowout preventers having shear rams |
| 02/25/1986 | US4572322 Finding distance to blowout using wellbore acoustic measurements |
| 02/25/1986 | US4572298 Gate valve apparatus and method |
| 02/25/1986 | US4572288 Time-delayed ignition system for a down-hole explosive tool |
| 01/21/1986 | US4565252 Borehole operating tool with fluid circulation through arms |
| 12/24/1985 | US4560934 Method of transporting a payload in a borehole |
| 12/17/1985 | US4559149 Workover fluid |
| 12/10/1985 | US4557628 Method and apparatus for remotely cutting broken underwater guidelines |
| 11/26/1985 | CA1197181A1 Valves |
| 11/19/1985 | US4553877 Method of converting a cable in the ground into a closed guiding track for insertion of new conductors |
| 11/12/1985 | CA1196570A1 Method for controlling subsurface blowout |
| 11/06/1985 | EP0055760B1 Method of converting a cable in the ground into a closed guiding track for insertion of new conductors |
| 11/05/1985 | US4550781 Method of and apparatus for cutting and recovering of submarine surface casing |
| 10/30/1985 | EP0159813A2 Blowout preventer stacks |
| 09/10/1985 | US4540046 Shear ram apparatus |
| 09/03/1985 | US4538684 Repair of shallow casing leaks in oil wells |
| 08/27/1985 | US4537250 Shearing type blowout preventer |
| 08/07/1985 | EP0150643A2 Safety valve, in particular to close an oil-well |
| 07/30/1985 | US4531585 Safety shear apparatus and method for production wells |
| 07/30/1985 | US4531583 Cement placement methods |
| 07/23/1985 | US4530396 Device for stimulating a subterranean formation |
| 07/16/1985 | US4528910 Apparatus for cutting a submerged tube by means of a pyrotechnic charge |