| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 01/28/2010 | DE10392229B4 Absenkbares stoßaktiviertes Bohrlochvibrationswerkzeug Lowerable shock-activated downhole vibration tool |
| 01/21/2010 | WO2010007434A2 Improved downhole tool |
| 01/21/2010 | US20100012383 High productivity core drilling system |
| 01/21/2010 | CA2730481A1 Improved downhole tool |
| 01/20/2010 | CN201386525Y Spear blanking plug |
| 01/20/2010 | CN201386524Y Special fishing tool for packer rubber |
| 01/14/2010 | WO2009120957A3 Downhole debris removal tool |
| 01/14/2010 | WO2009012178A3 Method and apparatus for decreasing drag force of trigger mechanism |
| 01/14/2010 | US20100006279 Intervention Tool with Operational Parameter Sensors |
| 01/13/2010 | CN201381817Y Oil field underground fisher |
| 01/09/2010 | CA2671424A1 Methods of making multiple casing cuts |
| 01/07/2010 | WO2009132645A3 Grappler |
| 12/31/2009 | US20090321085 Pump off junk mill |
| 12/30/2009 | CN201372759Y Fishing socket with steel wire ropes |
| 12/30/2009 | CN201372758Y Combined fishing tool of complex well bore |
| 12/30/2009 | CN201372757Y Multipurpose underground fishing tool |
| 12/29/2009 | US7637321 Apparatus and method for unsticking a downhole tool |
| 12/23/2009 | CN201367901Y Fishing head of wireless MWD inclinometer |
| 12/23/2009 | CN201367880Y Telescoping spear |
| 12/23/2009 | CN201367879Y Drawing-in type box bell |
| 12/17/2009 | US20090308593 Double-acting jar compounder |
| 12/17/2009 | US20090308590 Fishing overshot tool |
| 12/16/2009 | CN201363117Y Cable perforation blowout preventer pressure test seat and retrievable pole thereof |
| 12/16/2009 | CN201363116Y Integrated process device for sand removal and fishing outside pipe |
| 12/16/2009 | CN201361382Y Well fisher |
| 12/10/2009 | WO2009102705A3 Improved downhole debris cather and associated mill |
| 12/10/2009 | WO2009102703A3 Self adjusting debris excluder sub |
| 12/10/2009 | US20090301723 Interface for deploying wireline tools with non-electric string |
| 12/10/2009 | US20090301707 Double-acting jar |
| 12/09/2009 | CN201358743Y Fishing and milling integration tool |
| 12/09/2009 | CN201358403Y Special compacted wire rope for sand-bailing in oilfield |
| 12/04/2009 | CA2776415A1 Interface for deploying wireline tools with non-electric string |
| 12/02/2009 | CN201354631Y Mechanical throwing-in and pulling gas well underground releasing testing tool |
| 12/01/2009 | CA2517895C Casing running and drilling system |
| 11/26/2009 | DE102008002835A1 Hakenfänger Hook catcher |
| 11/25/2009 | CN201351472Y Long-distance partial abrasion sucker rod salvage barrel |
| 11/25/2009 | CN201351471Y Gate fisher |
| 11/25/2009 | CN201351470Y Safe deblocking releasing visible reinforcement latch jack |
| 11/23/2009 | CA2634552A1 Double-acting compounder |
| 11/19/2009 | WO2009140005A1 Downhole material retention apparatus |
| 11/19/2009 | US20090283327 Jointed spearhead assembly |
| 11/18/2009 | CN201347733Y Well top mechanical oscillator |
| 11/17/2009 | US7617867 Overshot tool |
| 11/12/2009 | WO2009137720A2 Drilling jar |
| 11/12/2009 | WO2009137537A2 Signal operated tools for milling, drilling, and/or fishing operations |
| 11/12/2009 | US20090277690 Drilling jar |
| 11/12/2009 | CA2723420A1 Drilling jar |
| 11/12/2009 | CA2722612A1 Signal operated tools for milling, drilling, and/or fishing operations |
| 11/11/2009 | CN101575956A Concentric integral water detecting and plugging pipe column |
| 11/05/2009 | WO2009134886A2 Vibrating downhole tool |
| 11/05/2009 | WO2009132645A2 Grappler |
| 11/05/2009 | US20090273201 Tricam axial extension to provide gripping tool with improved operational range and capacity |
| 11/05/2009 | US20090272540 Mobile hydraulic workover rig |
| 11/05/2009 | CA2766058A1 Mobile hydraulic workover rig |
| 11/05/2009 | CA2720515A1 Vibrating downhole tool |
| 11/03/2009 | US7610957 Downhole debris catcher and associated mill |
| 10/29/2009 | US20090266544 Signal operated tools for milling, drilling, and/or fishing operations |
| 10/27/2009 | US7607903 Stator tube removal and installation device |
| 10/22/2009 | US20090260822 Backoff sub and method for remotely backing off a target joint |
| 10/14/2009 | CN201326400Y Latch jack for large-diameter pipe in drill hole |
| 10/14/2009 | CN201326399Y Reverse-circulation magnetic force overshot |
| 10/14/2009 | CN201326398Y Forcing compression type underground throttle salvaging tool |
| 10/14/2009 | CN201326395Y Quick latch jack for wire line coring |
| 10/14/2009 | CN101555779A Interlayer channeling-preventing and well-completing process for inner-tube-free grout filling |
| 10/13/2009 | CA2490615C Downhole tool |
| 10/08/2009 | WO2009123467A1 Impact sub device |
| 10/07/2009 | EP2107210A2 Valve, core sampling apparatus and method |
| 10/07/2009 | CN101550811A Lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool |
| 10/06/2009 | CA2446844C Lockable overshot |
| 10/01/2009 | WO2009120957A2 Downhole debris removal tool |
| 10/01/2009 | US20090242203 Toggle overshot |
| 10/01/2009 | CA2719792A1 Downhole debris removal tool |
| 09/30/2009 | CN201318144Y Lift-put type left hand fishing spear |
| 09/30/2009 | CN201318143Y Guide shoe die tap slider dipper |
| 09/30/2009 | CN201318142Y Milling and fishing integrated tool |
| 09/30/2009 | CN201318141Y Fishing tool specially used for damaged special cables |
| 09/30/2009 | CN101545363A Spiral drill rod fisher |
| 09/22/2009 | US7591314 Measurement-while-fishing tool devices and methods |
| 09/16/2009 | CN201310311Y Composite latch jack |
| 09/16/2009 | CN100540842C Internal shoring type salvaging device |
| 09/10/2009 | US20090223676 Selective Agitation |
| 09/09/2009 | CN201306143Y Novel fisher for downhole tubular falling object |
| 09/09/2009 | CN201306142Y Polished rod salvaging device used in oil field |
| 09/09/2009 | CN201306141Y Drill-releasing device |
| 09/09/2009 | CN100538001C Fluid-pressure salvaging method for drilling bucket gate of digging-rotary driller |
| 09/09/2009 | CN100538000C Method for salvaging drilling bucket gate of digging-rotary driller |
| 09/08/2009 | CA2461278C Corrugated downhole tubulars |
| 09/02/2009 | CN201301678Y Bored pile drill bit picker |
| 09/02/2009 | CN201301677Y Drilling tool fishing device |
| 08/27/2009 | US20090211770 Elongated Sealing Member for Downhole Tool |
| 08/27/2009 | US20090211747 Washpipe |
| 08/27/2009 | US20090211746 High-energy gas fracture apparatus for through-tubing operation |
| 08/26/2009 | CN201297149Y Bit extractor of drilled pile with gib head plate |
| 08/26/2009 | CN201297148Y Bolt drill rotor overshot |
| 08/26/2009 | CN201297147Y Salvage device of clipped drill rod of gadder |
| 08/26/2009 | CN101517191A Method of and system for determining the free point in a drill pipe |
| 08/25/2009 | US7578348 Overshot tool for retrieving an object in a well and methods of use therefor |
| 08/20/2009 | WO2009102703A2 Self adjusting debris excluder sub |
| 08/20/2009 | CA2715904A1 Self adjusting debris excluder sub |
| 08/19/2009 | CN201292794Y Multiple-limb well deflector finger grip |