| 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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| 02/11/1992 | US5086838 Tapered cutting tool for reaming tubular members in well bore |
| 01/30/1992 | DE4024000A1 Centralisers for oil well casings |
| 01/29/1992 | EP0468230A2 A mill or other metal cutting tool |
| 01/28/1992 | CA1294868C Casing patch method and apparatus |
| 01/14/1992 | CA1294198C Method and apparatus for repairing casings and the like |
| 01/07/1992 | US5078546 Pipe bursting and replacement method |
| 12/24/1991 | US5074361 Method of latching |
| 12/24/1991 | US5074356 Milling tool and combined stabilizer |
| 12/24/1991 | US5074355 Section mill with multiple cutting blades |
| 12/17/1991 | CA1293207C Apparatus for correcting irregularities in or enlarging an underground duct |
| 12/10/1991 | US5070952 Downhole milling tool and cutter therefor |
| 12/04/1991 | EP0459610A2 Milling tool for well casings |
| 11/28/1991 | WO1991018235A1 Pipe bursting and replacement apparatus and method |
| 11/20/1991 | CN1056333A Hydraulic drilling jar |
| 11/13/1991 | EP0456305A2 Hydraulic drilling jar |
| 11/12/1991 | CA1291923C Hydraulic power system |
| 11/03/1991 | WO1991017340A1 Anti-rotation device for use in wellbores |
| 11/03/1991 | CA2081780A1 Anti-rotation device for use in wellbores |
| 10/30/1991 | EP0454466A2 Drillable well bore packing apparatus |
| 10/29/1991 | US5060738 Three-blade underreamer |
| 10/29/1991 | US5060573 Detonator assembly |
| 10/27/1991 | CA2041270A1 Well bore packing apparatus and methods of drilling thereof |
| 10/23/1991 | EP0452397A1 Wireline releasing device and method of releasing wireline |
| 10/22/1991 | US5058676 Method for setting well casing using a resin coated particulate |
| 10/22/1991 | US5058666 Cutting tool for removing materials from well bore |
| 10/15/1991 | US5056269 Apparatus for working in pipes |
| 10/09/1991 | EP0451058A1 Method and apparatus for discarding a tubing in an access well to a salt cavity for gas storage |
| 10/08/1991 | US5054555 Tension-actuated mechanical detonating device useful for detonating downhole explosive |
| 09/24/1991 | US5050839 Valve |
| 09/17/1991 | CA1289061C Pipe connector and method of applying same |
| 09/10/1991 | US5046563 Apparatus and method for cutting an object in a well |
| 09/10/1991 | US5046558 Method and apparatus for repairing casings and the like |
| 09/03/1991 | CA1288415C Pipe lining apparatus |
| 08/21/1991 | EP0442675A2 Milling tool for well side-tracking |
| 08/20/1991 | US5040283 Method for placing a body of shape memory metal within a tube |
| 08/20/1991 | CA1287848C Equipment for rod string, namely a drill string, having a coupling with a side light for insertion of a cable |
| 08/14/1991 | CN1013506B Method for placing body of shape memory metal within tubing |
| 08/13/1991 | US5038859 Cutting tool for removing man-made members from well bore |
| 08/06/1991 | USRE33656 Downhole cementing tool assembly |
| 08/06/1991 | US5036921 Underreamer with sequentially expandable cutter blades |
| 07/30/1991 | US5035292 Whipstock starter mill with pressure drop tattletale |
| 07/30/1991 | US5035285 Electrically conductive |
| 07/30/1991 | CA1286982C Hydraulic stabilizer for bore hole tool |
| 07/23/1991 | US5033557 Hydraulic drilling jar |
| 07/18/1991 | WO1991010806A1 Centralizers for oil well casings |
| 07/16/1991 | US5031699 Method of casing off a producing formation in a well |
| 07/16/1991 | US5031540 Apparatus for severing tubular members |
| 07/11/1991 | WO1991010039A1 A device and a method for preventing calamities |
| 07/03/1991 | EP0434924A1 Apparatus for drilling an offset or side-tracked well, especially from a cased well |
| 07/02/1991 | US5027914 Pilot casing mill |
| 07/02/1991 | US5027903 Coiled tubing velocity string hangoff method and apparatus |
| 07/02/1991 | US5027895 Expandable packer apparatus |
| 06/30/1991 | WO1991009907A1 Polymer and asphalt reaction process and polymer-linked-asphalt product |
| 06/30/1991 | CA2072579A1 Polymer and asphalt reaction process and polymer-linked-asphalt product |
| 06/25/1991 | US5025858 Well apparatuses and anti-rotation device for well apparatuses |
| 06/23/1991 | CA2033048A1 One trip window cutting tool method and apparatus |
| 05/28/1991 | US5018580 Section milling tool |
| 05/28/1991 | CA1284459C I-t-h pipe cutting tool |
| 05/14/1991 | US5014780 Long distance section mill for pipe in a borehole |
| 05/14/1991 | US5014779 Device for expanding pipes |
| 05/14/1991 | US5014778 Milling tool for cutting well casing |
| 05/14/1991 | CA1284100C Cutting tool for cutting well casing |
| 05/08/1991 | EP0426427A2 Well completion method |
| 05/08/1991 | EP0357711A4 A method and apparatus for repairing casing and the like |
| 05/08/1991 | EP0353309A4 Method of constructing a well |
| 05/07/1991 | US5012863 Pipe milling tool blade and method of dressing same |
| 05/01/1991 | CA2028737A1 Method for setting well casing using a resin coated particulate |
| 04/30/1991 | US5010967 Milling apparatus with replaceable blades |
| 04/30/1991 | US5010955 Casing mill and method |
| 03/26/1991 | US5002130 System for handling reeled tubing |
| 03/20/1991 | EP0418056A1 Metal seal casing patch |
| 03/20/1991 | EP0417877A1 Shearing gate valve |
| 03/20/1991 | CN1050076A Pipe-expanding device |
| 03/13/1991 | EP0416719A1 Shearing gate valve |
| 03/05/1991 | US4997162 Shearing gate valve |
| 03/05/1991 | US4997041 Method for selectively operating a wireline tool releasing device |
| 03/05/1991 | CA1281050C Casing patch seal |
| 02/26/1991 | CA1280633C Milling tool |
| 02/13/1991 | CN1049213A Method for fixing rocklayer of contain minerals in drilling well |
| 02/04/1991 | WO1991002138A1 Apparatus for recovering a wellhead |
| 01/29/1991 | US4987956 Apparatus for use in drilling a well at an offshore location |
| 01/22/1991 | US4986360 System for handling reeled tubing |
| 01/15/1991 | US4984488 Method of securing cutting elements on cutting tool blade |
| 01/08/1991 | US4983071 Pipe bursting and replacement apparatus and method |
| 01/01/1991 | US4981177 Method and apparatus for establishing communication with a downhole portion of a control fluid pipe |
| 12/20/1990 | DE3940354A1 Underground pipe removal method - involves cutting through in lengthwise direction and forming space between it and earth |
| 12/20/1990 | DE3940321A1 Replacement of underground metal pipes - is achieved by cutting old pipe into two halves, forcing halves apart and inserting new pipe |
| 12/18/1990 | US4978260 Cutting tool for removing materials from well bore |
| 12/11/1990 | US4976322 Method of construction of multiple-string wells |
| 12/11/1990 | CA1277591C Rod locking device |
| 12/06/1990 | DE4017775A1 Verfahren und vorrichtung zum ausbau eines unterirdischen bohrloches Method and apparatus for the expansion of a subterranean well |
| 12/04/1990 | US4974672 Gravel packing system for a production radial tube |
| 12/02/1990 | CA2018054A1 Apparatus for completion of a subterranean well |
| 11/22/1990 | EP0397875A1 Pipe roller-expanding device |
| 11/22/1990 | EP0397870A1 Method of casing the production seam in a well |
| 11/20/1990 | US4971153 Method of performing wireline perforating and pressure measurement using a pressure measurement assembly disconnected from a perforator |
| 11/20/1990 | US4971152 Method and apparatus for repairing well casings and the like |
| 11/20/1990 | US4971146 Downhole chemical cutting tool |
| 11/14/1990 | EP0397417A1 Milling apparatus with replaceable blades |
| 11/14/1990 | CN1046956A Manual port closing tool for well cmenting |