| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 09/14/2011 | CN201972642U 封隔器打捞工具 Packer fishing tools |
| 09/14/2011 | CN201972641U 一种大直径卡瓦捞筒 One kind of fishing for large diameter tube slips |
| 09/14/2011 | CN201972640U 一种新型卡瓦 A new kava |
| 09/14/2011 | CN201972639U 一种正扣滑块 A positive buckle sliders |
| 09/14/2011 | CN201972638U 一种倒管式高效磨鞋 An inverted tube mill efficiency shoes |
| 09/14/2011 | CN102182412A Complete equipment for plugging liner during operation under pressure |
| 09/09/2011 | WO2011109102A1 Method and apparatus for removal of pigs, deposits and other debris from pipelines and wellbores |
| 09/09/2011 | WO2011088324A3 Tubular member adaptor apparatus |
| 09/08/2011 | US20110214872 Method and apparatus for removal of pigs, deposits and other debris from pipelines and wellbores |
| 09/07/2011 | CN201963237U 一种多管径助推装置 A multi-diameter driver device |
| 09/07/2011 | CN102174880A Releasing method applicable to packer layered sand fracturing string |
| 09/06/2011 | US8011427 Double-acting jar |
| 08/31/2011 | CN201953339U 一种油井桥塞套铣打捞工具 One kind of bridge plug Washover Well Fishing Tools |
| 08/31/2011 | CN201953338U 复合套铣打捞工具 Composite Washover fishing tools |
| 08/31/2011 | CN201953337U 一种水平井反循环冲洗打捞工具 A horizontal wells reverse circulation flushing Fishing Tools |
| 08/31/2011 | CN201953336U 掉块打捞网 Fishing net off the block |
| 08/31/2011 | CN201953335U 可冲洗螺旋式抽油杆扶正器打捞工具 Flushable spiral rod stabilizer Fishing Tools |
| 08/31/2011 | CN201953334U 套铣头 Head sets |
| 08/24/2011 | CN201943630U 油气井井下落物辅助打捞工具 Oil Well Fishing Tools drop-assisted |
| 08/24/2011 | CN201943629U 光杆打捞器 Rod fisher |
| 08/24/2011 | CN201943628U 一种用于对扣打捞的引子对扣器 A primer on the buckle on the buckle device salvage |
| 08/24/2011 | CN201943627U 旋绕式井下钢缆打捞装置 Convoluted downhole cable salvage equipment |
| 08/24/2011 | CN201943626U Fisher of broken drilling tools in drilling poured-pile holes |
| 08/24/2011 | CN201943625U 一种双向震击加速器 A two-way shock accelerator |
| 08/24/2011 | CN201943624U 一种液压动力油井解卡打捞工具 A hydraulic power oil stuck Fishing Tools |
| 08/24/2011 | CN201943623U 海洋油气生产平台修井用油管液压顶升解卡装置 Offshore oil and gas production platforms with tubing workover hydraulic jacking Xie card device |
| 08/24/2011 | CN201943597U 液压安全接头 Hydraulic safety joint |
| 08/23/2011 | US8002036 Internal release connector and method |
| 08/23/2011 | US8002032 Hydraulic overshot with removable setting and testing core |
| 08/17/2011 | EP1888871B1 Casing and drill pipe filling and circulation apparatus |
| 08/17/2011 | EP1226336B1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 08/17/2011 | CN201934046U 一种可退式大范围打捞矛 One kind of retreat-style large-scale spear |
| 08/17/2011 | CN201934045U 一种连续油管打捞工具 A continuous tubing fishing tools |
| 08/10/2011 | EP2352899A1 Downhole actuator |
| 08/09/2011 | US7992636 Device and method for retrieving debris from a well |
| 08/04/2011 | WO2011093720A1 Method and device for loosening a cast-in casing |
| 08/04/2011 | US20110186297 Applications of smart fluids in well service operations |
| 08/04/2011 | US20110186286 One Trip Retrieval of a Multi-zone Fracturing System |
| 08/03/2011 | CN201915879U 加长杆公锥 Plus pole male cone |
| 08/03/2011 | CN201915878U 连续液压上击器和下击器 Continuous hydraulic on strike and at the butt |
| 08/03/2011 | CN201915877U 水平井反循环内捞杯 The horizontal wells reverse circulation fishing Cup |
| 08/03/2011 | CN201915853U 组合式打捞油管 Combined salvage tubing |
| 07/27/2011 | CN201908602U Guide pipe withdrawable fishing spear |
| 07/27/2011 | CN201908601U Sealing left hand fishing spear |
| 07/27/2011 | CN201908600U Through-center die collar |
| 07/27/2011 | CN201908599U Fishing tool for multifunctional spiral drilling rig |
| 07/27/2011 | CN201908598U Short drilling jar |
| 07/20/2011 | EP2344717A1 External grip tubular running tool |
| 07/20/2011 | CN201902187U Multifunctional reverse circulation fragment fishing barrel |
| 07/20/2011 | CN101353953B Apparatus for de-clamping loose formation well pipe |
| 07/20/2011 | CA2782660A1 Wellbore knock-out chamber and related methods of use |
| 07/19/2011 | US7980311 Devices, systems and methods for equalizing pressure in a gas well |
| 07/19/2011 | US7980310 Backoff sub and method for remotely backing off a target joint |
| 07/14/2011 | CA2786343A1 Downhole tool releasing mechanism |
| 07/07/2011 | US20110162887 Inserting and extracting underground sensors |
| 06/30/2011 | WO2011044411A3 Compact jar for dislodging tools in an oil or gas well |
| 06/29/2011 | CN201883997U Drill-free cementing device of horizontal well |
| 06/29/2011 | CN201883977U Continuous oil pipe type fishing tool for slip downhole choke |
| 06/29/2011 | CN201883976U Down-hole pipe salvaging cylinder |
| 06/29/2011 | CN201883975U Drift size gauge tool for dredging, scraping and flushing well |
| 06/28/2011 | CA2564621C Method for releasing stuck drill string using spotting fluid |
| 06/23/2011 | US20110146990 Backoff sub and method for remotely backing off a target joint |
| 06/22/2011 | CN201874553U Wired while-drilling swirl guide shoe capable of being used for seating wireless circulating sleeve |
| 06/22/2011 | CN201874505U Multifunctional milling fishing tool |
| 06/22/2011 | CN201874504U Reverse circulating drilling machine picking stone device |
| 06/22/2011 | CN201874483U Combining tool for starter joint |
| 06/21/2011 | US7963324 Flow control actuation |
| 06/21/2011 | CA2650364C Method for jarring with a downhole pulling tool |
| 06/21/2011 | CA2626755C Diverter plugs for use in well bores and associated methods of use |
| 06/16/2011 | WO2010062186A9 Downhole actuator |
| 06/15/2011 | CN201865619U Draggable controller for overflowing of oil tube |
| 06/15/2011 | CN201865611U Reversing spear |
| 06/09/2011 | WO2011019926A3 Optimized machining process for cutting tubulars downhole |
| 06/09/2011 | US20110132621 Multi-Component Disappearing Tripping Ball and Method for Making the Same |
| 06/09/2011 | US20110132598 Downhole jarring tool with reduced wear latch |
| 06/09/2011 | US20110132597 Downhole jarring tool |
| 06/08/2011 | CN201857916U Device for fishing steel wire junks |
| 06/08/2011 | CN201857915U Impactor for downhole accident disposal in wireline operation |
| 06/08/2011 | CN201857914U Barrel type jar for wireline operation |
| 06/03/2011 | WO2011031528A3 Methods and apparatus for manipulating and driving casing |
| 06/03/2011 | WO2011022346A3 Spoolable coiled tubing spear for use in wellbores |
| 06/01/2011 | CN201851058U Combined slip socket |
| 05/26/2011 | WO2011061506A2 Tubular retrieval |
| 05/26/2011 | WO2011028448A3 Debris catcher with retention within screen |
| 05/26/2011 | CA2780248A1 Tubular retrieval |
| 05/25/2011 | CN201843556U Hydraulic withdrawable overshot |
| 05/25/2011 | CN201843548U Underground detaching device |
| 05/19/2011 | WO2011060423A1 Assembly and method for wide catch overshot |
| 05/19/2011 | WO2009137537A3 Signal operated tools for milling, drilling, and/or fishing operations |
| 05/19/2011 | US20110114317 Assembly and method for wide catch overshot |
| 05/19/2011 | CA2774705A1 Assembly and method for wide catch overshot |
| 05/18/2011 | CN201835782U Tray of bailing oil extractor |
| 05/18/2011 | CN201835781U Logging cut-and-thread fishing cable dropping preventive device |
| 05/11/2011 | CN201826811U Drifting scraping device |
| 05/04/2011 | CN201818269U Steel plate overshot for oil well |
| 05/04/2011 | CN201818268U Hydraulic rotary jam release device |
| 04/27/2011 | CN201810250U Hydraulic returnable salvage spear |
| 04/27/2011 | CN201810249U Dropped drill salvaging device |
| 04/27/2011 | CN201810248U Hitching milling shoe type box tap |
| 04/27/2011 | CN201810247U Milling pin tap |