| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
|---|
| 03/11/1987 | CN85103274A Dynamic monitoring and controlling method for drill head falling of a shaft-well driller |
| 03/10/1987 | US4648445 For retrieving and releasing a downhole tool |
| 03/04/1987 | EP0212957A2 Packer mill |
| 03/03/1987 | US4646855 Method for raising and lowering a drill string in a wellbore during drilling operations |
| 03/03/1987 | US4646843 For use in lifting a liquid from within a well |
| 03/03/1987 | US4646830 Mechanical jar |
| 01/21/1987 | EP0209343A2 Method of avoiding a drill string becoming stuck during drilling |
| 01/14/1987 | CN86104849A Process for avoiding the equipment of well-drilling to block up in the well |
| 01/06/1987 | CA1216276A1 Apparatus and method for extracting horizontal underground pipe |
| 12/30/1986 | US4632193 In-hole motor with bit clutch and circulation sub |
| 12/09/1986 | CA1214990A1 Wire line running and/or pulling tool |
| 12/02/1986 | US4626134 Apparatus and method for extracting horizontal underground pipe |
| 11/25/1986 | US4624306 Downhole mobility and propulsion apparatus |
| 11/20/1986 | EP0201668A1 Mechanical jarring tool |
| 11/05/1986 | EP0200466A2 Method for releasing stuck drill string |
| 10/14/1986 | US4616721 Packer Mill |
| 10/07/1986 | US4615399 Valved jet device for well drills |
| 09/30/1986 | US4614235 Use of mono and polyalkylene glycol ethers as agents for the release of differentially stuck drill pipe |
| 08/26/1986 | US4607692 Wireline jar |
| 08/26/1986 | CA1210385A1 Adjustable length drilling sub |
| 08/13/1986 | CN85100990A Technology and well dredger for cable dredging vertical wells |
| 08/05/1986 | US4603739 Process for cleaning an oil field well bore hole using an internal casing wiper |
| 07/29/1986 | US4602690 Detachable apparatus for preventing differential pressure sticking in wells |
| 07/16/1986 | EP0187408A1 Pulling tool |
| 07/15/1986 | US4600059 Line moving apparatus for wireline supported tools |
| 06/25/1986 | EP0185466A1 Packer mill |
| 06/25/1986 | EP0185111A1 Downhole steering apparatus |
| 06/10/1986 | CA1205823A1 Additive composition for release of stuck drill pipe |
| 05/27/1986 | US4591197 Wire line running and/or pulling tool |
| 04/29/1986 | CA1203750A1 Oil well packer retriever |
| 04/15/1986 | US4582148 Mechano-hydraulic double-acting drilling jar |
| 04/08/1986 | US4580826 Retrieval tool |
| 04/08/1986 | CA1202879A1 Downhole tool and method using the same |
| 03/26/1986 | EP0175536A2 Retrieval device |
| 03/18/1986 | US4576229 Device for facilitating release of stuck drill collars |
| 03/11/1986 | US4574888 Method and apparatus for removing stuck portions of a drill string |
| 03/04/1986 | US4573536 Method and apparatus for flushing a well |
| 02/04/1986 | CA1200199A1 Method and apparatus for removal of downhole well debris |
| 01/28/1986 | US4566546 Single acting hydraulic fishing jar |
| 12/17/1985 | US4558895 Pulling tool |
| 12/17/1985 | US4558749 Anti-jamming core barrels |
| 11/12/1985 | CA1196626A1 Direct drive for deep-well drilling |
| 11/05/1985 | US4550789 Hydraulic jarring tool |
| 11/05/1985 | US4550781 Method of and apparatus for cutting and recovering of submarine surface casing |
| 10/22/1985 | US4548437 Downhole well fishing assembly |
| 10/15/1985 | CA1195315A1 Enclosed jar tool |
| 10/08/1985 | US4545444 Jar mechanism energizer |
| 10/08/1985 | US4545432 Device for retrieving objects from wells |
| 10/08/1985 | CA1194858A1 Recovery of ground drilling equipment |
| 10/02/1985 | EP0156575A2 Clamps |
| 10/01/1985 | CA1194412A1 Retrieving objects from wells |
| 09/18/1985 | EP0155129A2 Apparatus for retrieving pipe sections from a well bore |
| 09/17/1985 | CA1193591A1 Locking device for a tool with telescopically displaceable parts |
| 09/11/1985 | EP0154520A2 Releasable spear for retrieving tubular members from a well bore |
| 09/03/1985 | CA1192898A1 Attachment for a percussive rock drilling machine |
| 08/27/1985 | US4537435 Downhole retrieval tool |
| 08/27/1985 | US4537255 Method of backing off a conduit joint in a wellbore |
| 07/30/1985 | CA1191130A1 Hydraulic drilling jar |
| 07/03/1985 | EP0147154A1 Wireline jar |
| 07/02/1985 | US4526241 Adjustable length drilling sub |
| 06/25/1985 | US4524838 For use in imparting jarring blows to an object lodged in the bore of a well |
| 06/18/1985 | US4523765 High pressure sealing means for longitudinally movable parts of deep-well drilling tools |
| 05/07/1985 | US4515403 Overshot |
| 05/07/1985 | US4515212 Internal casing wiper for an oil field well bore hole |
| 04/30/1985 | CA1186215A1 Releasing overshot apparatus |
| 04/23/1985 | US4512424 Tubular spring slip-joint and jar |
| 04/23/1985 | US4512398 Pump-out plug catcher |
| 04/16/1985 | US4511007 Locking device for a tool with telescopically displaceable parts |
| 04/09/1985 | US4509593 Downhole mobility and propulsion apparatus |
| 04/02/1985 | US4508174 Downhole tool and method of using the same |
| 03/19/1985 | US4505341 Combination clean-out and drilling tool |
| 02/12/1985 | US4498548 Well jar incorporating elongate resilient vibration snubbers and mounting apparatus therefor |
| 01/22/1985 | US4494615 Jarring tool |
| 01/22/1985 | US4494610 Method for releasing stuck drill pipe |
| 01/01/1985 | US4491181 Method of freeing stuck drill string using spotting fluid |
| 12/18/1984 | US4488747 Method and fishing tool apparatus for recovering objects from wells |
| 12/05/1984 | EP0127126A1 Sub for connection in a drill string |
| 12/04/1984 | US4485880 Direct drive for deep-well drilling |
| 11/06/1984 | US4480688 Method and bridge plug for sealing off a well |
| 10/31/1984 | EP0122917A1 Hydraulic drilling jar |
| 10/30/1984 | CA1177058A1 Jar tool |
| 10/23/1984 | US4478285 Method and apparatus for removal of downhole well debris |
| 10/23/1984 | US4478284 Jar tool |
| 10/10/1984 | EP0121329A2 Downhole well tool |
| 08/21/1984 | US4466486 Water or brine and an ether-containing polymer |
| 08/07/1984 | US4463815 Mechanical jarring tool |
| 07/31/1984 | US4462471 Bidirectional fluid operated vibratory jar |
| 07/31/1984 | CA1171779A1 Fishing tool to retrieve cables from wells |
| 07/11/1984 | EP0113201A1 Device for retrieving objects from wells |
| 06/26/1984 | US4456081 Hydraulic drilling jar |
| 06/13/1984 | EP0110803A1 Single acting hydraulic fishing jar |
| 06/12/1984 | US4453756 Wireline fishing tool |
| 06/12/1984 | CA1169047A1 Method and apparatus for reducing the differential pressure sticking tendency of a drill string |
| 06/05/1984 | US4452478 Nuclear waste storage process and system |
| 05/15/1984 | US4448250 Method of freeing a hollow tubular member |
| 05/15/1984 | CA1167433A1 Well jar |
| 05/08/1984 | US4446930 Drill steel removal attachment for rock drilling machine |
| 05/08/1984 | US4446610 Retrievable float valve assembly |
| 04/03/1984 | US4440241 Method and apparatus for drilling a well bore |
| 03/13/1984 | US4436638 Additive composition for release of stuck drill pipe |