| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 09/26/2012 | CN202451098U Lead cone milling shoe |
| 09/26/2012 | CN202451097U Differential motion hydraulic pressure booster for horizontal section of horizontal well |
| 09/25/2012 | CA2677247C Casing running and drilling system |
| 09/20/2012 | US20120234533 Precision marking of subsurface locations |
| 09/19/2012 | CN202441303U Slip fisher for well-repairing working |
| 09/19/2012 | CN202441302U Special die collar for salvage recycling type whipstock |
| 09/19/2012 | CN202441301U Drilling tool fishing device for special-shaped borehole |
| 09/19/2012 | CN202441295U Safety relief device for pipe column |
| 09/19/2012 | CN102678648A Hydraulic oil overflow valve |
| 09/19/2012 | CN102678077A Pumping cable fishing gear and method |
| 09/18/2012 | US8267167 Subsurface safety valve and method of actuation |
| 09/18/2012 | CA2667934C Interface for deploying wireline tools with non-electric string |
| 09/13/2012 | WO2012122141A1 Jarring method and apparatus using fluid pressure to reset jar |
| 09/13/2012 | WO2012120403A1 Mechanical force generator for a downhole excitation apparatus |
| 09/13/2012 | WO2012119186A1 Overshot |
| 09/13/2012 | US20120227970 Jarring Method and Apparatus Using Fluid Pressure to Reset Jar |
| 09/13/2012 | CA2829220A1 Jarring method and apparatus using fluid pressure to reset jar |
| 09/13/2012 | CA2828675A1 Mechanical force generator for a downhole excitation apparatus |
| 09/13/2012 | CA2828254A1 Overshot |
| 09/12/2012 | CN202431244U Horizontal well fish guiding cylinder |
| 09/12/2012 | CN202431243U Fishing socket for borehole operation |
| 09/12/2012 | CN202431242U Repairing and fishing integrated tool |
| 09/12/2012 | CN202431241U Bend head fishing tool |
| 09/12/2012 | CN102661145A Electromagnetic wave wireless drilling-following measurement system capable of being replaced without pullout |
| 09/12/2012 | CN101666217B Core-filling drilling tool of rope side wall |
| 09/12/2012 | CN101660394B Single core cable oil field deep well dredging instrument |
| 09/11/2012 | US8261830 Fishing tool and method |
| 09/11/2012 | US8261829 Well fishing method and system |
| 09/06/2012 | US20120222857 Assembly |
| 09/06/2012 | DE102008002835B4 Hakenfänger Hook catcher |
| 09/05/2012 | CN202417378U Eccentric position-limiting sliding block spear |
| 09/05/2012 | CN202417377U Multifunctional oil field underground salvage device |
| 09/05/2012 | CN202417376U Releasing follow sleeve fishing socket |
| 09/05/2012 | CN102019056B Narrow well rescuing tool |
| 09/05/2012 | CN102019055B Lifesaving fishing tool for deep and narrow wells |
| 09/05/2012 | CN101644147B Feeding and salvaging tool of electronic single/multi-point measurement instrument suitable for gas drilling |
| 09/04/2012 | US8256509 Compact jar for dislodging tools in an oil or gas well |
| 08/29/2012 | CN101575956B Concentric integral water detecting and plugging pipe column |
| 08/23/2012 | US20120211217 Control line running system |
| 08/22/2012 | CN202391374U Fisher of drilling rod with large-caliber drilling hole |
| 08/22/2012 | CN202391373U Combined fishing tool special for oil well |
| 08/22/2012 | CN202391372U Hollow grind shoes for refloating small underground litters |
| 08/22/2012 | CN202391367U Bidirectional bearing rotary lifting-pressing short circuit |
| 08/22/2012 | CN202391345U Recyclable well drilling and well completion whipstock for oil drilling |
| 08/21/2012 | US8245771 Method and apparatus for demagnetizing a borehole |
| 08/21/2012 | CA2543423C Running and cementing tubing |
| 08/15/2012 | EP2486225A2 Compact jar for dislodging tools in an oil or gas well |
| 08/15/2012 | CN202381015U Combined fishing cylinder for pumping well of oil field |
| 08/15/2012 | CN202381014U Dual-purpose drill rod fisher |
| 08/15/2012 | CN202381013U Composite small junk fishing socket |
| 08/15/2012 | CN202381012U Washover inversely-buckled salvage cylinder |
| 08/15/2012 | CN202381011U Integrated multipurpose drift size gauge tool |
| 08/15/2012 | CN102635352A Perforation pressure meter as well as dispenser and fisher thereof |
| 08/15/2012 | CN102635324A Hole-controlled idling antitheft lock of back room and key |
| 08/14/2012 | US8240373 Apparatus and method for removing debris from a well |
| 08/08/2012 | CN102628348A Tubular tubing float valve |
| 08/02/2012 | WO2012068054A3 Apparatus and method for adjusting spring preload in a downhole tool |
| 08/02/2012 | US20120193098 Selective fracturing tool |
| 08/01/2012 | CN202360055U Fishing socket for packer rubber cylinder |
| 08/01/2012 | CN102619486A Sand washing type fishing technology for sand prevention pipe string |
| 08/01/2012 | CN102619485A Building block type salvage process for sand prevention tubular columns |
| 08/01/2012 | CN102619484A Well wall coring while drilling tool |
| 07/26/2012 | US20120186818 Sucker Rod Coupling and Method of Wear Prevention in Driven Rotation of a Sucker Rod String in Production Tubing |
| 07/25/2012 | CN202348198U Movable hook type external fishing hook |
| 07/25/2012 | CN202348197U Novel guiding shoes for salvage |
| 07/25/2012 | CN202348196U Novel fishing tool |
| 07/25/2012 | CN202348195U Yellow mud fishing socket |
| 07/25/2012 | CN102606105A Casing extractor |
| 07/25/2012 | CN102606104A Composite magnetic rod type sand setting cylinder |
| 07/24/2012 | US8225860 Downhole jarring tool with reduced wear latch |
| 07/24/2012 | US8225859 Debris cleanup tool with flow reconfiguration feature |
| 07/19/2012 | US20120181048 Debris barrier assembly |
| 07/18/2012 | CN202338253U 卡瓦式井下节流器密封胶筒打捞工具 Kava ceremony downhole choke tube sealant fishing tools |
| 07/18/2012 | CN202338252U 一种便于打捞的电缆连接头安全拉脱结构 An easy-to salvage the cable connector safe pull-off structure |
| 07/18/2012 | CN202338251U 辅助节流器解封的震击器 Auxiliary restrictor unsealed jars |
| 07/18/2012 | CN202338250U 高效磨鞋 Efficient grinding shoes |
| 07/18/2012 | CN102587860A Removable anti-blocking safety valve and special fishing tool for same |
| 07/17/2012 | US8220532 Magnet fixing device in a cleaning tool |
| 07/11/2012 | CN202325344U 穿心打捞防止快速接头落井装置 Peg salvage prevent rapid fall into a device connector |
| 07/11/2012 | CN202325343U 一种塑料供液管打捞器 A plastic tube for fisher |
| 07/11/2012 | CN202325342U Side hook type steel wire and wire cap fisher |
| 07/11/2012 | CN202325341U Combined type sucker-rod fishing tool |
| 07/11/2012 | CN102561971A Reverse rotating boot socket |
| 07/11/2012 | CN102561966A Multifunction downhole release tool mechanism with lost motion |
| 07/05/2012 | WO2012091982A2 Plug-inducing matter and method of plugging a wellbore |
| 07/05/2012 | WO2012091716A1 Hydraulic/mechanical tight hole jar |
| 07/05/2012 | US20120168147 Overshot with Dynamic Seal Feature |
| 07/05/2012 | CA2823177A1 Hydraulic/mechanical tight hole jar |
| 07/04/2012 | EP2470748A2 Methods and apparatus for manipulating and driving casing |
| 07/04/2012 | CN202300272U 井下钻具打捞器 Downhole drill fisher |
| 07/04/2012 | CN202300271U 井下抓卡打捞器 Underground catch card fisher |
| 07/04/2012 | CN202300270U 一种定向井取套用滚珠收鱼套铣头 Apply as a directional well to take the ball close Fish Head sets |
| 07/04/2012 | CN202300269U 井筒小件落物防掉装置 Wellbore small pieces falling off the device anti-matter |
| 07/04/2012 | CN202300268U 扭矩式节流解卡装置 Torque type throttle stuck device |
| 07/04/2012 | CN102536147A Extrusion-injection releasable socket |
| 07/04/2012 | CN102536136A Steel wire fixing device of intelligent bailing type oil pumping unit |
| 07/04/2012 | CN101638574B Acid-in-oil stuck freeing fluid and production method and use method thereof |
| 06/28/2012 | WO2012088132A2 Surface signal for flow blockage for a subterranean debris collection apparatus |
| 06/28/2012 | WO2012084227A1 Tool for extracting an object engaged in a fluid exploitation pipe, extraction device and related method |
| 06/28/2012 | WO2012083413A1 Vibration tool |