| 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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| 11/13/1990 | US4969627 Rod locking device |
| 10/17/1990 | EP0392755A1 A milling tool and combined stabiliser |
| 10/02/1990 | CA1274770A1 Well apparatus |
| 09/05/1990 | EP0385673A1 Downhole milling tool and cutter therefor |
| 09/05/1990 | CN1009470B Casing patch seal |
| 08/21/1990 | US4949789 Pressure relief system for down hole chemical cutters |
| 08/15/1990 | CA2009981A1 Valve |
| 07/31/1990 | US4944351 Downhole safety valve for subterranean well and method |
| 07/25/1990 | EP0379270A2 Hydraulic power system |
| 07/17/1990 | US4941535 Manual port closing tool for well cementing |
| 07/12/1990 | WO1990007628A1 Wireline releasing device and method of releasing wireline |
| 07/04/1990 | EP0376433A1 Cutting tool for removing packers or the like from wells |
| 07/04/1990 | EP0376431A1 Annular port-closing tool and method for well cementing |
| 07/03/1990 | US4938291 Cutting tool for cutting well casing |
| 06/27/1990 | CA2006200A1 Wireline releasing device and method of releasing wireline |
| 06/06/1990 | EP0371576A1 Non-rotating plug set |
| 06/06/1990 | EP0371161A1 Apparatus for severing tubular members |
| 06/06/1990 | CN1042752A Detonation assembly for explosive wellhead severing system |
| 05/31/1990 | WO1990005832A1 Method of casing the production seam in a well |
| 05/31/1990 | WO1990005831A1 Pipe roller-expanding device |
| 05/30/1990 | EP0370591A2 Downhole chemical cutting tool |
| 05/15/1990 | US4925344 Method and apparatus for replacing buried pipe |
| 05/08/1990 | US4923008 Hydraulic power system and method |
| 05/08/1990 | US4923005 System for handling reeled tubing |
| 05/01/1990 | CA1268414A1 Method and device for conveying chemicals through borehole |
| 04/18/1990 | EP0363424A1 Apparatus for working in pipes |
| 04/17/1990 | CA1267836A1 Device and method for effecting provision of an opening in well casing |
| 04/03/1990 | US4913758 Method and apparatus for repairing casings and the like |
| 03/28/1990 | EP0360319A1 Method for placing a body of shape memory material within a cavity |
| 03/28/1990 | CN1040859A Method for placing body of shape memory metal within tubing |
| 03/27/1990 | US4911410 Shearing gate valve |
| 03/20/1990 | US4909321 Wireline releasing device |
| 03/20/1990 | US4909320 Detonation assembly for explosive wellhead severing system |
| 03/14/1990 | EP0357711A1 A method and apparatus for repairing casing and the like |
| 02/27/1990 | US4903764 Swivelsub |
| 02/13/1990 | US4899823 Method and apparatus for running coiled tubing in subsea wells |
| 02/07/1990 | EP0353962A2 Casing cutters |
| 02/07/1990 | EP0353309A1 Method of constructing a well |
| 01/30/1990 | CA1265123A1 Mechanically actuated whipstock assembly |
| 01/30/1990 | CA1264934A1 Curvature probe and method |
| 01/16/1990 | US4893675 Section milling tool |
| 01/09/1990 | US4892149 Method of securing a tubular member within an annular well member, the combined well structure and the tool |
| 01/02/1990 | US4890675 Horizontal drilling through casing window |
| 12/26/1989 | US4889187 Multi-run chemical cutter and method |
| 12/19/1989 | US4887668 Cutting tool for cutting well casing |
| 12/12/1989 | US4886115 Wireline safety mechanism for wireline tools |
| 11/28/1989 | US4883118 Combination tubing cutter and releasing overshot |
| 11/08/1989 | EP0341073A1 Pipe milling tool blade and method of dressing same |
| 11/02/1989 | EP0339776A2 Improved cutting tool and method for removing materials from well bore |
| 10/25/1989 | EP0338165A1 Pressure controlled tool for servicing operations in a pipeline |
| 10/24/1989 | US4875523 Pipeline servicing tool |
| 10/10/1989 | US4872509 Oil well production system using a hollow tube liner |
| 09/26/1989 | US4869321 Method of plugging openings in well conduits |
| 09/26/1989 | CA1261817A1 Earth drilling method and apparatus using multiple hydraulic forces |
| 09/12/1989 | US4865128 Gravel packing system for a production radial tube |
| 09/12/1989 | US4865127 Method and apparatus for repairing casings and the like |
| 08/23/1989 | CN1034973A Method of isolation of troublesorne zones in well with profile patch liners |
| 08/22/1989 | US4858687 Non-rotating plug set |
| 08/01/1989 | US4852654 Wireline hydraulic isolation packer system |
| 07/27/1989 | WO1989006739A1 Method of constructing a well |
| 07/27/1989 | WO1989006738A1 A method and apparatus for repairing casing and the like |
| 07/25/1989 | US4850432 Manual port closing tool for well cementing |
| 07/18/1989 | US4848964 Apparatus for correcting irregularities in or enlarging an underground duct |
| 06/27/1989 | US4842082 Variable outside diameter tool for use in pikewells |
| 06/06/1989 | US4836279 Non-rotating plug |
| 05/16/1989 | US4830109 Casing patch method and apparatus |
| 05/10/1989 | EP0315038A2 Method for working joints in concrete tubes, and device for carrying out the method |
| 05/03/1989 | EP0314268A1 Casing patch method and apparatus |
| 05/02/1989 | US4825953 Well servicing system |
| 04/04/1989 | US4817725 Oil field cable abrading system |
| 04/04/1989 | US4817716 Pipe connector and method of applying same |
| 03/07/1989 | US4809775 I-T-H pipe cutting tool |
| 02/01/1989 | EP0301808A2 Device for providing a passage for a drill string |
| 01/24/1989 | US4799829 Method and apparatus for removing submerged platforms |
| 01/10/1989 | US4796709 Milling tool for cutting well casing |
| 01/05/1989 | DE3720573A1 Tool which can be releasably inserted in a borehole casing string |
| 12/29/1988 | WO1988010393A1 Apparatus for working in pipes |
| 11/29/1988 | US4787315 Apparatus for severing tubular members |
| 11/17/1988 | EP0291011A1 Rerounding apparatus |
| 11/08/1988 | US4782786 Device to fill and glue all kinds of depressions in inaccessible pipe conduits |
| 11/02/1988 | EP0289103A2 Pipe connector and method of applying same |
| 10/26/1988 | EP0288288A2 I-T-H pipe cutting tool |
| 10/11/1988 | US4776394 Hydraulic stabilizer for bore hole tool |
| 09/22/1988 | WO1988007154A1 Device in lining of pipes |
| 09/06/1988 | US4768588 Connector assembly for a milling tool |
| 08/17/1988 | EP0278730A2 Hydraulic stabilizer for bore hole tool |
| 08/16/1988 | US4763737 For use in well casings |
| 08/16/1988 | US4763734 Earth drilling method and apparatus using multiple hydraulic forces |
| 07/12/1988 | US4756644 Rerounding apparatus |
| 07/12/1988 | US4756365 For use in a cased wellbore |
| 07/05/1988 | US4754810 Method for patching casing leaks |
| 06/22/1988 | CN87215505U Pressure breaking bullet |
| 06/14/1988 | US4750561 Gravel packing system for a production radial tube |
| 06/08/1988 | EP0269653A1 Apparatus for correcting irregularities in or enlarging an underground duct. |
| 05/24/1988 | US4746246 Remotely actuated cutting assembly for broken underwater guidelines |
| 05/17/1988 | CA1236770A2 Shaped charge carrier assembly |
| 05/11/1988 | EP0266864A2 Cutting tool for cutting well casing |
| 05/04/1988 | EP0266017A2 Rod locking device |
| 04/27/1988 | EP0211825B1 Device to fill in and glue all kinds of depressions in inaccessible pipe conduits |
| 04/19/1988 | US4738312 Cable cutting coupling for drilling, production, well logging or other operations in wells |