| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 08/21/2001 | US6276452 Apparatus for removal of milling debris |
| 08/16/2001 | WO2001059253A1 Improved tubular running tool |
| 08/16/2001 | US20010013413 Apparatus for retrieving metal objects from a wellbore |
| 08/16/2001 | US20010013411 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 08/16/2001 | US20010013410 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 08/09/2001 | WO2001057357A1 Method and apparatus for retrieving equipment from a well |
| 08/07/2001 | US6269877 Magnetic assembly for use with a downhole casing perforator |
| 08/02/2001 | WO2001018357A3 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 07/31/2001 | US6267186 Spotting fluid and method of treating a stuck pipe |
| 07/31/2001 | US6267180 Packer releasing tool and method for releasing a packer assembly from a wellbore |
| 07/31/2001 | CA2259776C Magnetic assembly for use with a downhole casing perforator |
| 07/31/2001 | CA2160417C Valve for a two way hydraulic drilling jar |
| 07/24/2001 | US6263986 Hydraulic drilling jar |
| 07/24/2001 | CA2206492C Jar apparatus and method of jarring |
| 07/11/2001 | EP1114116A1 Aphron-containing well drilling and servicing fluids of enhanced stability |
| 07/11/2001 | CN1068372C Hydrocarbon composition for removing alphaltenes in oil well and its use |
| 06/22/2001 | CA2329429A1 Liner sliver retrieval method for multilateral wells |
| 06/12/2001 | US6244642 Retrievable bridge plug and retrieving tool |
| 05/31/2001 | WO2001038689A1 Device for manipulating a tool in a well tubular |
| 05/30/2001 | EP1102913A1 Downhole tension swivel sub |
| 05/30/2001 | CN2432331Y Shaft bottom cleaning device |
| 05/17/2001 | WO2001034937A1 Method and device for exciting transversal oscillations of a pipe string in a borehole |
| 05/15/2001 | US6230797 Flow control device retrieval tool and method |
| 05/10/2001 | WO2001033045A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/10/2001 | WO2001033044A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/10/2001 | CA2376544A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/08/2001 | US6227292 Flexible sinker bar assemblies |
| 04/25/2001 | CN2427620Y Grab type collar fishing means |
| 04/24/2001 | US6220348 Retrievable bridge plug and retrieving tool |
| 04/18/2001 | EP1092901A2 Method for removing and/or replacing an underground conduit |
| 04/17/2001 | US6216787 Apparatus for retrieving metal objects from a wellbore |
| 04/11/2001 | EP1090206A1 Tubular injector with snubbing jack and oscillator |
| 03/27/2001 | US6206101 Method and device for facilitating the insertion of a coiled tube into a well and for loosening stuck objects in a well |
| 03/22/2001 | WO2001020123A1 Hydraulically driven fishing jars |
| 03/20/2001 | US6202767 Double acting hydraulic jar |
| 03/15/2001 | WO2001018357A2 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 03/14/2001 | EP1083297A2 Apparatus for freeing an object underground, and the application of such apparatus |
| 03/14/2001 | CN2423397Y Movable oil-field servicing rig |
| 03/08/2001 | WO2001016460A1 Hydraulic jar |
| 03/06/2001 | US6196309 Down hole pulling tool and method of use |
| 02/27/2001 | US6193474 Guide member details for a through-tubing retrievable well pump |
| 02/06/2001 | US6182775 Downhole jar apparatus for use in oil and gas wells |
| 01/31/2001 | EP1071731A1 Fluid and method for releasing tubular elements stuck in a well |
| 01/31/2001 | EP1032748A4 Flexible sinker bar assemblies |
| 01/23/2001 | US6176323 Drilling systems with sensors for determining properties of drilling fluid downhole |
| 01/23/2001 | US6176311 Downhole cutting separator |
| 01/18/2001 | WO2001004459A1 Downhole anchoring tools conveyed by non-rigid carriers |
| 12/26/2000 | US6164393 Impact tool |
| 12/26/2000 | US6164377 Downhole packer system |
| 12/19/2000 | CA2191955C Ball and seat valve assembly and downhole pump utilizing said valve assembly |
| 12/06/2000 | EP1056923A2 System, apparatus and method for facilitating retrieval of an item from a well |
| 11/29/2000 | EP1021635A4 Gas-filled accelerator |
| 11/28/2000 | US6152222 Hydraulic device to be connected in a pipe string |
| 11/28/2000 | US6152219 Downhole pulling tool |
| 11/21/2000 | US6148917 Method of releasing stuck pipe or tools and spotting fluids therefor |
| 10/24/2000 | US6135217 Converted dual-acting hydraulic drilling jar |
| 10/19/2000 | WO2000061909A1 Tubular running tool |
| 10/17/2000 | US6131953 Coiled tubing drilling hydraulic disconnect |
| 09/27/2000 | CN2398419Y Underground fishing strengthening device |
| 09/26/2000 | US6123159 Aphron-containing well drilling and servicing fluids of enhanced stability |
| 09/13/2000 | CN1056434C Eccentric water-nozzle oil-nozzle water-distributor and pulling and running tool |
| 09/08/2000 | WO1999037877A3 System, apparatus and method for facilitating retrieval of an item from a well |
| 09/06/2000 | EP1032748A1 Flexible sinker bar assemblies |
| 08/29/2000 | US6109373 Cable overshot apparatus |
| 08/23/2000 | EP1030030A2 Downhole pulling tool |
| 08/17/2000 | WO2000047690A1 Method of releasing stuck pipe or tools and spotting fluids therefor |
| 08/10/2000 | WO2000046482A1 Process and arrangement for retrieving of equipment from bore holes |
| 08/09/2000 | EP1025337A1 Method and apparatus for engaging an object |
| 08/01/2000 | US6095583 Wellbore fishing tools |
| 07/29/2000 | CA2296873A1 Downhole pulling tool |
| 07/26/2000 | EP1021635A1 Gas-filled accelerator |
| 07/19/2000 | EP1019612A1 Converted dual-acting hydraulic drilling jar |
| 07/19/2000 | CN2388343Y One-wheel fisher |
| 07/19/2000 | CN2388342Y Hydraulic stuck-releasing device for drilling well |
| 07/19/2000 | CN2388341Y 强制反循环打捞器 Forced reverse circulation fisher |
| 07/05/2000 | EP1015729A1 Connection of tubulars using a top drive |
| 06/21/2000 | CN2383966Y Mechanical up-hammer |
| 06/13/2000 | CA2179184C Whipstock apparatus and methods of use |
| 06/07/2000 | EP0900320A4 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 05/31/2000 | EP1003954A1 Impact enhancing tool |
| 05/31/2000 | CN2380679Y Multi-gear fisher |
| 05/24/2000 | EP1002932A2 Process and device for trenchless replacement of conduits |
| 05/17/2000 | EP0830493B1 Mechanical-hydraulic double-acting drilling jar |
| 05/16/2000 | US6062324 Fluid operated vibratory oil well drilling tool |
| 05/03/2000 | EP0710317B1 Bidirectional hydraulic jar |
| 05/02/2000 | US6056049 Wellhead retrieving tool |
| 04/20/2000 | CA2286543A1 Retrievable bridge plug and retrieving tool |
| 04/19/2000 | CN2374641Y Sucking type bailer |
| 04/18/2000 | CA2181790C Method and combination of materials for releasing a stuck pipe |
| 03/29/2000 | CN2371332Y Well grab for criminal investigation to obtain evidence |
| 03/28/2000 | US6041860 Apparatus and method for performing imaging and downhole operations at a work site in wellbores |
| 03/22/2000 | CN2370153Y Integrated milling and catching device for drilling well |
| 03/14/2000 | US6035954 Fluid operated vibratory oil well drilling tool with anti-chatter switch |
| 02/29/2000 | US6029745 Casing cutting and retrieving system |
| 02/16/2000 | CN2364212Y Adjustable hydraulic water distribution fisher |
| 02/15/2000 | CA2058040C Large bore hydraulic drilling jar |
| 02/03/2000 | WO2000005483A1 Connection of tubulars using a top drive |
| 02/03/2000 | WO2000005323A1 Aphron-containing well drilling and servicing fluids of enhanced stability |
| 02/02/2000 | EP0975853A1 Downhole coiled tubing recovery apparatus |
| 02/01/2000 | US6019173 Multilateral whipstock and tools for installing and retrieving |