| 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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| 01/07/1998 | EP0815344A1 Whipstock |
| 01/06/1998 | US5704437 Method of enhancing production from a well |
| 12/29/1997 | EP0663040A4 Method for forming a window in a subsurface well conduit. |
| 12/16/1997 | US5698814 Hard target penetrator with multi-segmenting casing cutter |
| 12/16/1997 | US5697438 Torque control device for downhole milling |
| 12/09/1997 | US5695010 Method of drilling around an existing casing pipe to regenerate an old well |
| 12/09/1997 | US5695008 Preform or matrix tubular structure for casing a well |
| 12/04/1997 | WO1997045623A1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 12/04/1997 | WO1997045619A1 Multicut window mill |
| 11/27/1997 | WO1997044566A1 Process and device for separation of pipes or columns fixed in the ground |
| 11/27/1997 | DE19620756A1 Verfahren und Vorrichtung zum Abtrennen von im Boden verankerten Rohren oder Pfeilern Method and apparatus for separating pipes or columns anchored in the ground |
| 11/06/1997 | DE19616703A1 Aperture forming method for underground reed used in soil sampling |
| 11/04/1997 | CA2055127C Non-rotating cementing plug with molded inserts |
| 11/03/1997 | CA2803822A1 One trip milling system |
| 11/03/1997 | CA2684983A1 One trip milling system |
| 10/21/1997 | US5678635 Thru tubing bridge plug and method |
| 10/15/1997 | EP0800610A1 Apparatus for forming a slot in a wellbore |
| 10/14/1997 | US5676206 Window-cutting system for downhole tubulars |
| 10/09/1997 | CA2185718A1 Multi-purpose drilling tool |
| 09/12/1997 | WO1997033066A1 Method of removing wellhead assemblies |
| 09/09/1997 | US5664628 Filter for subterranean wells |
| 09/09/1997 | US5664627 Method and apparatus for protecting a steel riser from chemical cutters |
| 09/03/1997 | EP0792409A1 Filter for subterranean wells |
| 08/19/1997 | US5657820 Two trip window cutting system |
| 08/06/1997 | EP0677135A4 Method and apparatus for setting a whipstock. |
| 08/05/1997 | US5653418 Ram-type blowout preventer |
| 07/31/1997 | WO1997027380A2 Method for forming a window in a tubular and apparatus for use in said method |
| 07/31/1997 | CA2242341A1 Method for forming a window in a tubular and apparatus for use in said method |
| 07/22/1997 | US5649595 Milling method for liners extending into deviated wellbores |
| 07/16/1997 | CN1154731A Device and method for making a slot in an underground formation |
| 07/15/1997 | US5647437 Thru tubing tool and method |
| 07/15/1997 | US5647436 Method of forming a window in a downhole tubular |
| 07/02/1997 | EP0781369A2 Apparatus for milling a well casing |
| 07/01/1997 | US5642787 Section milling |
| 06/26/1997 | WO1997013954A3 Mill for wellbore milling operations |
| 06/24/1997 | USRE35542 Pipe bursting and replacement method |
| 06/19/1997 | WO1997021903A1 Apparatus and method for forming a window or an outline thereof in the casing of a cased wellbore |
| 06/11/1997 | EP0778392A2 Method and apparatus for removing the uppermost part of a construction in the seabed |
| 06/10/1997 | US5636692 Casing window formation |
| 06/02/1997 | CA2188725A1 Torque control device for downhole milling |
| 05/21/1997 | EP0774039A1 Device and method for making a slot in an underground formation |
| 05/15/1997 | WO1997017523A1 Apparatus for forming a slot in a wellbore |
| 05/14/1997 | EP0772725A1 Method and apparatus of installing a whipstock |
| 05/06/1997 | US5626189 Cutting insert for a tool for wellbore milling operations |
| 04/29/1997 | US5623994 Well head cutting and capping system |
| 04/17/1997 | WO1997013954A2 Mill for wellbore milling operations |
| 04/15/1997 | US5620051 Whipstock |
| 04/10/1997 | WO1997013053A1 Apparatus and method for milling a well casing |
| 04/03/1997 | WO1997012112A1 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access |
| 04/02/1997 | EP0765428A1 Pipe cutter |
| 04/01/1997 | US5615740 Casting assembly for use in drilling lateral boreholes |
| 03/27/1997 | WO1997011251A1 A cutting insert for use in a wellbore milling tool |
| 03/27/1997 | WO1997011250A1 Milling apparatus |
| 03/27/1997 | WO1997011249A1 A method and apparatus for producing a sidetrack bore from a main wellbore |
| 03/25/1997 | US5613557 Apparatus and method for sealing perforated well casing |
| 03/20/1997 | WO1997010409A1 Window-cutting system for downhole tubulars |
| 03/20/1997 | CA2205004A1 Window-cutting system for downhole tubulars |
| 02/09/1997 | CA2182825A1 Separately powered tube shearing mechanism for a gate valve |
| 02/06/1997 | WO1997004208A1 Branch boreholes |
| 02/05/1997 | EP0397870B1 Method of casing the production seam in a well |
| 02/05/1997 | EP0353309B1 Method of constructing a well |
| 01/30/1997 | WO1997003274A1 Single trip whipstock assembly |
| 01/21/1997 | US5595247 Retrievable through tubing tool and method |
| 01/21/1997 | CA2111881C Cutting/expanding tool |
| 01/14/1997 | US5592991 Method and apparatus of installing a whipstock |
| 01/02/1997 | EP0750716A1 Milling tool |
| 01/01/1997 | CN2244091Y Energy collecting cutter |
| 01/01/1997 | CN2244090Y Shearing high temperature resistance anti-corrosion oil drainage device |
| 12/18/1996 | EP0748925A1 Method and device for casing a borehole with a deformable pipe |
| 12/17/1996 | US5584350 Wellbore sidetracking methods |
| 12/05/1996 | WO1996038648A1 Method and apparatus of installing a whipstock |
| 12/05/1996 | CA2195522A1 Method and apparatus of installing a whipstock |
| 11/20/1996 | EP0643794B1 Method of creating a wellbore in an underground formation |
| 11/19/1996 | US5575331 Chemical cutter |
| 11/05/1996 | CA2056917C Apparatus for regaining control over oil and gas flowing from "blow out" walls |
| 10/22/1996 | US5566762 Thru tubing tool and method |
| 10/15/1996 | US5564503 Methods and systems for subterranean multilateral well drilling and completion |
| 10/15/1996 | US5564499 Method and device for slotting well casing and scoring surrounding rock to facilitate hydraulic fractures |
| 10/03/1996 | WO1996030623A1 Milling tool, whipstock, milling system and method of forming a window in the wall of a tubular |
| 10/03/1996 | WO1996030622A1 Whipstock |
| 10/03/1996 | CA2480707A1 Hydrocarbon production using multilateral well bores |
| 10/03/1996 | CA2480703A1 Hydrocarbon production using multilateral well bores |
| 09/25/1996 | CA2164773A1 Whipstock and starter mill |
| 09/18/1996 | CN2235500Y Device for reconditioning of well casing |
| 09/17/1996 | US5556900 Modified asphalts for paving and roofing |
| 09/03/1996 | US5551665 Ball valve with coiled tubing cutting ability |
| 09/03/1996 | US5551509 Mill lick out apparatus |
| 07/18/1996 | WO1996009460A3 Apparatus for milling a well casing |
| 07/11/1996 | WO1996021083A1 Method and device for casing a well, particularly an oil well bore or a pipe, using an in situ curable flexible tubular preform |
| 07/10/1996 | EP0720684A1 Method of and apparatus for horizontal well drilling |
| 07/02/1996 | US5531272 Low temperature underwater epoxy system for zone isolation, remedial cementing, and casing repair |
| 07/02/1996 | US5531271 Wellbore tool side support |
| 06/26/1996 | EP0717808A1 Apparatus for use in a wellbore |
| 06/13/1996 | WO1996018022A1 Filter for subterranean wells |
| 06/13/1996 | CA2207372A1 Filter for subterranean wells |
| 06/12/1996 | CN2228971Y Well repair bomb |
| 06/12/1996 | CN1124517A Sand screen structure |
| 06/11/1996 | USRE35271 Pipe bursting and replacement apparatus |
| 06/11/1996 | US5525010 Method and apparatus for severing tubular members |
| 06/11/1996 | US5524517 Apparatus for cutting columnar structures with reciprocally movable tensioned cutting wire |