| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 02/26/2014 | CN203452707U Vibration clamping releasing device and well repair device |
| 02/26/2014 | CN203452706U Ground mechanical bumper jar for deep wells and extra-deep wells |
| 02/26/2014 | CN103603626A Short-pipe fallen object inner fisher |
| 02/26/2014 | CN102444104B Special tool and construction method for undamaged drilling of bottom plates of caissons |
| 02/25/2014 | US8657007 Hydraulic jar with low reset force |
| 02/20/2014 | WO2014028254A2 Hydraulic jar with low reset force |
| 02/19/2014 | CN203441415U Anti-knocking reverse buckling type fishing spear |
| 02/19/2014 | CN203441414U Wide-area overshot |
| 02/19/2014 | CN203441413U Strong magnetic overshot |
| 02/19/2014 | CN203441412U Inner fishing tool guide drum |
| 02/19/2014 | CN103590800A Multi-level pitch fracturing sliding sleeve capable of fishing ball seats |
| 02/19/2014 | CN103590774A Connecting sleeve fixing structure of fisher |
| 02/19/2014 | CN102296939B Automatic pressure-balancing expansion-catch integrated expandable tube tool and use method thereof |
| 02/12/2014 | CN203430460U Sealed fishing tool for compression type oil pipe |
| 02/12/2014 | CN203430459U Slide slip type coiled tubing jar knocker |
| 02/12/2014 | CN203430458U Fishing gear for instruments in casings |
| 02/12/2014 | CN103573204A Fallen steel wire fisher passing through tapered string |
| 02/11/2014 | CA2761304C Packer retrieving mill with debris removal |
| 02/05/2014 | CN103556968A One-time drift diameter gauge for full-well drill string and use method thereof |
| 02/04/2014 | US8641113 Gripping device for tubular objects |
| 02/04/2014 | US8641112 Handheld metallic debris collector |
| 01/30/2014 | WO2014018642A1 System and method of cutting and removing casings from wellbore |
| 01/29/2014 | CN203412538U Drop-preventing short section of cut-and-thread fishing cable for logging |
| 01/29/2014 | CN103547768A Jarring method and apparatus using fluid pressure to reset jar |
| 01/29/2014 | CN103547767A Vortex controlled variable flow resistance device and related tools and methods |
| 01/28/2014 | CA2723420C Drilling jar |
| 01/22/2014 | CN203403851U Downhole fiber-reinforced continuous composite tube fishing tool of oil field water injection well |
| 01/22/2014 | CN203403850U Underground sediment filtering device for hydraulic packer |
| 01/22/2014 | CN103527130A Reversing process string for horizontal well |
| 01/22/2014 | CN103527129A Slim hole spring-shaped slips |
| 01/22/2014 | CN103527128A Fishing tool for natural gas extraction downhole throttle device and operation method of fishing tool |
| 01/22/2014 | CN103527127A Flushing device |
| 01/21/2014 | CA2802917C Vibration tool |
| 01/16/2014 | US20140014321 Assembly |
| 01/15/2014 | CN203394411U Composite-type salvaging tool for oil pipe residual skin |
| 01/15/2014 | CN203394410U Plastic fishing socket |
| 01/15/2014 | CN203394409U Windowed hinge-type overshot |
| 01/15/2014 | CN203394408U Tool for fishing cables of electric pump |
| 01/15/2014 | CN203394407U Multi-stage fishing cup for well repairing operation |
| 01/15/2014 | CN203394406U Horizontal directional drilling emergency rescue device |
| 01/15/2014 | CN203394405U Fishing guide shoe for well repair |
| 01/15/2014 | CN203394397U Underground multifunctional sand washing processor |
| 01/15/2014 | CN203394394U Horizontal well sand washing and salvage integral tool |
| 01/15/2014 | CN203394349U Recoverable whipstock and combined salvage tool thereof |
| 01/15/2014 | CN103510903A Salvage spearhead structure for salvage device |
| 01/09/2014 | WO2014008260A1 Method and apparatus for tool retrieval |
| 01/08/2014 | EP2681408A1 Mechanical force generator for a downhole excitation apparatus |
| 01/08/2014 | EP2681407A2 Tractor and jar assembly |
| 01/08/2014 | CN203383766U Logging cable fishing spear with wall hook |
| 01/08/2014 | CN203383765U Internal fishing tube strong magnetic fisher |
| 01/08/2014 | CN203383764U Power double-mixing type workover rig |
| 01/07/2014 | US8622151 Feed cable system for a tower of a drilling machine |
| 01/03/2014 | WO2013040578A3 Sealed jar |
| 01/01/2014 | CN203374234U Slip salvaging device |
| 01/01/2014 | CN103492665A Tool for recovering junk and debris from a wellbore of a well |
| 01/01/2014 | CN103485336A Drilling pile drilling construction method of bead-type karst area |
| 12/31/2013 | CA2776758C Compact jar for dislodging tools in an oil or gas well |
| 12/27/2013 | WO2013191564A1 Change-over arrangement for a cable operated jar |
| 12/27/2013 | CA2877276A1 Change-over arrangement for a cable operated jar |
| 12/26/2013 | US20130341027 Downhole debris removal tool and methods of using same |
| 12/26/2013 | US20130341017 Downhole debris removal tool capable of providing a hydraulic barrier and methods of using same |
| 12/25/2013 | CN203362093U Claw hook type overshot |
| 12/25/2013 | CN203362092U Retractable fishing cylinder |
| 12/25/2013 | CN203362091U Flat-plate type strong magnetic extractor |
| 12/25/2013 | CN203362090U Reducing double-step salvage rod for blanking plug |
| 12/25/2013 | CN103470208A Recyclable run-in-hole blockage tool for oil and gas field |
| 12/25/2013 | CN103470205A Anti-jarring reversing fishing spear |
| 12/25/2013 | CN103470204A Drill fishing tool |
| 12/25/2013 | CN103469789A Karst-area underwater bridge pier drilled pile construction method |
| 12/19/2013 | US20130333896 Application of high intensity focused ultrasound to the displacement of drilling mud |
| 12/18/2013 | CN203347724U Salvage device capable of avoiding clamping |
| 12/18/2013 | CN203347723U Rotatable and retractable sectioning type slip fishing spear |
| 12/18/2013 | CN203347722U Self-cleaning two-sliding-block slip fishing spear |
| 12/18/2013 | CN203347721U Retreating drill rod fishing socket |
| 12/18/2013 | CN203347720U Intelligent well logging smoothing machine |
| 12/18/2013 | CN103452531A Method for underbalanced tubing descending, non-well-killing gas lifting, rotary pumping, pump maintaining and tubing maintaining |
| 12/18/2013 | CN103452514A Wide-range catch socket |
| 12/18/2013 | CN103452513A In-tube instrument fisher |
| 12/18/2013 | CN103452512A Ground hydraulic super jar |
| 12/18/2013 | CN103452511A Horizontal well strong magnetic die |
| 12/18/2013 | CN103452475A Hole forming method for underground soft fractured formation casting protection holes of coal mine |
| 12/17/2013 | US8607881 Heavy duty rope sockets and related methods |
| 12/17/2013 | US8607857 Vacuum debris removal with articulated pickup and visual capability |
| 12/12/2013 | WO2013101333A3 Apparatus and method for removing debris from a well |
| 12/11/2013 | CN203335008U 滑块式打捞工具 Sliding Fishing Tools |
| 12/11/2013 | CN203335007U Multilevel fisher for inner tubes with unknown sizes |
| 12/11/2013 | CN203335006U Milling overshot for short and light falling object |
| 12/11/2013 | CN203335005U Cotter pilotage salvage anchor |
| 12/11/2013 | CN203335004U Geological drilling horizontal type mass accelerator for drop hammer hitting in drill clamping and burying |
| 12/11/2013 | CN203335003U Reverse circulation magnetic fisher |
| 12/11/2013 | CN103437732A Downhole pneumatic shock wave generator |
| 12/11/2013 | CN102230366B Direct-control throwing and refloating device |
| 12/04/2013 | CN203321452U Leakage isolation, blockage removal and production integrated string for oil and water wells of oilfields |
| 12/04/2013 | CN203321399U High-pressure water-driven rolling fisher for coring horizontal rope |
| 12/04/2013 | CN203321398U Hydraulic jam-releasing device for sucker rod |
| 12/04/2013 | CN203321397U Slider type anti-block drift size gauge tool |
| 12/04/2013 | CN203321387U Electric release fishing device |
| 12/04/2013 | CN203321380U Anti-impact simple device for pulling out sleeve tube |
| 12/04/2013 | CN103422828A High-temperature hydraulic dual-jarring device |
| 12/04/2013 | CN103422827A Jarring-type bridge plug jar knocker |