| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 06/28/2012 | US20120160477 Large bore jar for a drill string |
| 06/28/2012 | CA2802917A1 Vibration tool |
| 06/27/2012 | EP2469014A1 Tool for extracting an object engaged in a fluid exploitation pipe, extraction device and related method. |
| 06/27/2012 | CN202284458U 密封式倒扣捞矛 Sealed Flip spear fishing |
| 06/26/2012 | CA2399786C Improved tubular running tool |
| 06/24/2012 | CA2763234A1 Large bore jar for a drill string |
| 06/21/2012 | WO2012082463A2 Vacuum debris removal with articulated pickup and visual capability |
| 06/21/2012 | US20120152522 Debris Collection Device with Enhanced Circulation Feature |
| 06/20/2012 | CN202280438U 井下作业电缆外捞矛 Downhole cable outer spear |
| 06/19/2012 | US8201629 Staging tool seal arrangement for gas wells |
| 06/14/2012 | WO2012030465A4 Fishing tool and method |
| 06/14/2012 | US20120145396 Releasing and recovering tool |
| 06/14/2012 | US20120145395 Heavy duty rope sockets and related methods |
| 06/13/2012 | CN202273671U 无线随钻复合多点仪器 MWD complex multi-instrument |
| 06/13/2012 | CN202273625U 生产井堵塞器打捞筒 Production wells clogged filter overshot |
| 06/08/2012 | CA2759375A1 Heavy duty rope sockets and related methods |
| 06/06/2012 | CN202266237U Stage cementing device for oil well completion |
| 06/06/2012 | CN202266224U Butt joint type uncorked well cementing tool inner tube salvaging device |
| 06/06/2012 | CN202266223U 一种可退式井下落物打捞筒 One kind of retreat wells falling matter overshot |
| 06/05/2012 | US8191626 Downhole jarring tool |
| 06/05/2012 | US8191623 Slickline conveyed shifting tool system |
| 05/31/2012 | WO2012068674A1 Fail safe locking overshot device |
| 05/31/2012 | WO2012068662A1 Fail safe locking overshot device |
| 05/31/2012 | CA2814974A1 Fail safe locking overshot device |
| 05/30/2012 | CN202250052U High-sensitivity digital display fishing weight indicator |
| 05/30/2012 | CN202249884U Multifunctional salvager for electric measuring instrument |
| 05/30/2012 | CN202249883U Integrated delivery and fishing plunger tool |
| 05/30/2012 | CN202249882U Hydraulic returnable slip overshot |
| 05/30/2012 | CN202249881U Planar ferromagnetic salvaging tool |
| 05/30/2012 | CN101798911B Underwater wellhead reclaiming tool |
| 05/24/2012 | WO2012068054A2 Apparatus and method for adjusting spring preload in a downhole tool |
| 05/24/2012 | US20120125612 Overshot device |
| 05/24/2012 | CA2817120A1 Apparatus and method for adjusting spring preload in a downhole tool |
| 05/23/2012 | CN202228032U Milling and fishing combined tool |
| 05/23/2012 | CN202228031U Oil pipe salvaging device |
| 05/18/2012 | WO2012064829A1 Tool for recovering junk and debris from a wellbore of a well |
| 05/18/2012 | WO2012064500A1 Casing spears and related systems and methods |
| 05/18/2012 | CA2817070A1 Casing spears and related systems and methods |
| 05/17/2012 | US20120118641 Apparatus and method for adjusting spring preload in a downhole tool |
| 05/17/2012 | US20120118582 Magnetically coupled actuation apparatus and method |
| 05/17/2012 | US20120118571 Tool for recovering junk and debris from a wellbore of a well |
| 05/17/2012 | US20120118560 Fishing tool |
| 05/16/2012 | CN102459805A 打捞筒设备 Overshot equipment |
| 05/15/2012 | CA2626749C Diverter plugs for use in well bores and associated methods of use |
| 05/10/2012 | WO2012036854A3 Debris chamber with helical flow path for enhanced subterranean debris removal |
| 05/09/2012 | CN202215179U Steel pipe type impacting reamer bit fisher |
| 05/09/2012 | CN202215178U Fishing device for deep wells |
| 05/09/2012 | CN102444104A Special tool and construction method for undamaged drilling of bottom plates of caissons |
| 05/02/2012 | CN202209155U Releasing device and salvaging device for well completion |
| 04/26/2012 | WO2012030465A3 Fishing tool and method |
| 04/25/2012 | EP2443311A2 Dual anchoring tubular back-off tool |
| 04/24/2012 | US8162064 Autonomous junk collecting sleeve for a riser |
| 04/19/2012 | WO2012051169A1 3-ring non-extrusion seal assembly and method |
| 04/19/2012 | US20120090843 Hydraulic jar |
| 04/18/2012 | CN202194608U 一种可钻式桥塞打捞工具 One kind of drillable bridge plug fishing tools |
| 04/18/2012 | CN101338658B 可进行钢丝作业的密闭电潜泵生产完井系统及操作方法 Steel operations can be sealed ESP completion systems of production and method of operation |
| 04/12/2012 | WO2012047111A1 Cable cutting device |
| 04/12/2012 | WO2012024168A3 Fishing tool |
| 04/12/2012 | WO2012003084A3 Installation system with force generating tool |
| 04/12/2012 | US20120086227 3-ring non-extrusion seal assembly and method |
| 04/10/2012 | US8151910 Drilling jar |
| 04/04/2012 | CN202181868U 弹簧三球打捞器 Spring three-ball fisher |
| 03/29/2012 | US20120074722 Head Assembly |
| 03/29/2012 | CA2753622A1 Downhole catcher for an actuating ball and method |
| 03/28/2012 | CN202176295U Adjustable centering sheet type drift well gauge for well testing |
| 03/22/2012 | WO2012036854A2 Debris chamber with helical flow path for enhanced subterranean debris removal |
| 03/21/2012 | CN202170772U 一种天然气高压井口闸阀振动解卡装置 One kind of high pressure natural gas wellhead valve stuck vibrating device |
| 03/14/2012 | CN202165040U 短钢丝打捞器 Short wire fisher |
| 03/14/2012 | CN202165039U 母锥芯杆打捞器 Female cone stem fisher |
| 03/14/2012 | CN202165038U 一种用于井下安全阀故障处理的工具 A downhole safety valve troubleshooting tools for |
| 03/14/2012 | CN202165005U 一种钻具及钻机 One kind of drilling and rig |
| 03/14/2012 | CN102373894A Feeding and refloating integrated type plunger tool and working method thereof |
| 03/13/2012 | US8132625 Dual action jet bushing |
| 03/08/2012 | WO2012030465A2 Fishing tool and method |
| 03/08/2012 | CA2808089A1 Fishing tool and method |
| 03/07/2012 | CN202157776U 三棱外钩式钢丝打捞器 Tri outer hook wire fisher |
| 03/07/2012 | CN202157775U 提放式可退双滑块捞矛 Put up double-slider-style retreat spear fishing |
| 03/01/2012 | WO2011153058A3 Magnetic retrieval apparatus and method for retaining magnets on downhole magnetic retrieval apparatus |
| 03/01/2012 | WO2011095816A3 Improved downhole tool and method |
| 03/01/2012 | US20120048553 Fishing tool and method |
| 03/01/2012 | US20120048552 Method of using wired drillpipe for oilfield fishing operations |
| 02/29/2012 | CN202152657U 卡爪式试井绳帽头打捞筒 Claw-type test twice shy hat head overshot |
| 02/29/2012 | CN202152656U 一种螺杆泵泵筒捞锚 One kind of screw pump barrel fishing anchor |
| 02/29/2012 | CN202152655U 多功能钻杆喇叭口打捞器 Multifunctional drill bell fisher |
| 02/29/2012 | CN202152654U 自动平衡压力胀捞一体化膨胀管工具 Automatic balancing pressure expansion pipe expansion fishing tool integration |
| 02/28/2012 | US8122960 Spoolable coiled tubing spear for use in wellbores and methods of using same |
| 02/23/2012 | WO2012024168A2 Fishing tool |
| 02/23/2012 | WO2011146253A3 Retaining and isolating mechanisms for magnets in a magnetic cleaning tool |
| 02/23/2012 | US20120043079 Sand control well completion method and apparatus |
| 02/23/2012 | US20120043073 Twin Latch Wireline Retrieval Tool |
| 02/23/2012 | US20120043070 Magnetic Slip Retention for Downhole Tool |
| 02/22/2012 | CN102359354A Downhole boot jack |
| 02/16/2012 | US20120037369 Fishing tool |
| 02/16/2012 | CA2806986A1 An attachment for percussion drill tools |
| 02/15/2012 | CN202144732U 内捞钩 Within the fishing hook |
| 02/08/2012 | CN202140057U 井下仪器内扣打捞器 Downhole instrument buckle fisher |
| 02/08/2012 | CN202140056U 钢筋笼式冲击扩孔钻头打捞器 Impact reaming drill steel cage fisher |
| 02/02/2012 | US20120024522 Electric Submersible Pump Band Basket Catcher |
| 02/01/2012 | CN102337882A Wireless while-drilling compound multipoint instrument |
| 01/26/2012 | US20120018144 Jar with improved valve |