| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 03/07/2013 | US20130056197 Optical casing collar locator systems and methods |
| 03/06/2013 | CN202767971U Bidirectional extractor |
| 03/06/2013 | CN202767932U Tubing coupling sealing fishing device |
| 03/06/2013 | CN202767931U Hydraulic back-off salvage device of down hole |
| 03/06/2013 | CN202767930U Slider-type piercing wireline fisher |
| 03/06/2013 | CN202767929U Small-diameter fisher |
| 03/06/2013 | CN202767928U Strong negative pressure plug removal device used for oil-water well plug removal and injection stimulation |
| 03/06/2013 | CN102953910A Hydraulic propeller for fishing spear |
| 03/06/2013 | CN102953701A Fishing head of conically spherical pilot bit type drilling tool |
| 03/06/2013 | CN102953700A Putting and recovering extension cord device for electromagnetic wave measurement while drilling system |
| 03/06/2013 | CN101988375B Intelligent tractor hoist of deep well in oil field |
| 03/05/2013 | US8387700 Wellbore debris cleanout assembly and method to remove debris from a debris catcher |
| 02/28/2013 | WO2013028402A2 Variable frequency fluid oscillators for use with a subterranean well |
| 02/28/2013 | WO2013028310A2 Subterranean vibrator with lateral vibration feature |
| 02/28/2013 | US20130049385 Method and system for sealing and handling pipe |
| 02/28/2013 | US20130048290 Injection of fluid into selected ones of multiple zones with well tools selectively responsive to magnetic patterns |
| 02/28/2013 | CA2843337A1 Variable frequency fluid oscillators for use with a subterranean well |
| 02/27/2013 | CN202755937U Downhole junk reverse circulation fishing washover pipe |
| 02/27/2013 | CN102943645A Deep well salvaging device |
| 02/27/2013 | CN102943644A Hydraulic anti-sticking method of rock drill propulsion loop |
| 02/27/2013 | CN101899956B Method for salvaging electric pump pipe column fish |
| 02/21/2013 | WO2013025516A2 Debris barrier for hydraulic disconnect tools |
| 02/21/2013 | CA2844446A1 Debris barrier for hydraulic disconnect tools |
| 02/20/2013 | EP2558679A2 A tool for removing debris from a wellbore |
| 02/20/2013 | CN202745785U Anti-sliding gas lift fishing tool of slip-type downhole choke |
| 02/20/2013 | CN202745784U Slip-type downhole flow controller gas lift fishing tool |
| 02/20/2013 | CN202745783U Drilling and milling type spiral external hook for salvaging clustered sucker rod |
| 02/20/2013 | CN202745782U Internal cutting device of hydraulic sleeve |
| 02/20/2013 | CN202745781U Downhole throttle salvaging tool for natural gas extraction |
| 02/20/2013 | CN101892823B Method for throwing and fishing out underground restrictor from gas well without utilizing steel wires |
| 02/13/2013 | CN202731879U Cut-and-thread fishing cable anti-wear device for petroleum logging |
| 02/13/2013 | CN202731807U Downhole fishing tool |
| 02/13/2013 | CN202731806U Electric heating cable fishing device |
| 02/13/2013 | CN202731805U Milling and fishing device of bridge plug |
| 02/13/2013 | CN202731804U Device for salvaging water pump from well |
| 02/13/2013 | CN202731803U A retrieving device for a wireless measurement-while-drilling instrument in petroleum well drilling |
| 02/13/2013 | CN202731802U Hydraulic self-locking continuous releasing tool |
| 02/13/2013 | CN202731801U Spherical open-hole drift size gauge tool |
| 02/13/2013 | CN202731800U Anti-stick well-drifting gauge |
| 02/13/2013 | CN102926687A Integrated downhole tool for detecting, washing and fishing in oil-well operation |
| 02/13/2013 | CN101517191B Method of and system for determining the free point in a drill pipe |
| 02/07/2013 | US20130032348 Fishing tool for drill pipe |
| 02/06/2013 | CN202718649U Salvage needle and salvage device for soft materials in pipe for oil-gas well |
| 02/06/2013 | CN202718648U Eccentric taper tool for dealing with fallen object in well |
| 02/06/2013 | CN102913181A Throwing type washable downhole pressure-bearing plugging device and plugging method thereof |
| 02/06/2013 | CN102913174A Cable fishing device |
| 02/06/2013 | CN102913173A Cable bridge plug fishing cylinder |
| 02/06/2013 | CN102913172A Fishing collar |
| 02/06/2013 | CN102913171A Slip socket |
| 02/06/2013 | CN102913170A Lead mould fisher |
| 02/06/2013 | CN102913169A Movable drilling inclinometer probe capturer and capturing method thereof |
| 02/05/2013 | US8365826 Hydraulically powered fishing tool and method |
| 02/05/2013 | US8365818 Jarring method and apparatus using fluid pressure to reset jar |
| 02/05/2013 | CA2510619C Impact enhancing apparatus and method |
| 01/31/2013 | WO2012020058A3 An attachment for percussion drill tools |
| 01/31/2013 | US20130025865 Wellbore knock-out chamber and related methods of use |
| 01/30/2013 | CN202706972U Hydraulic returnable fishing spear |
| 01/30/2013 | CN202706971U Bit fisher |
| 01/24/2013 | WO2013013136A1 Method and apparatus for catching and retrieving objects in a well |
| 01/24/2013 | US20130020096 Method and Apparatus for Catching and Retrieving Objects in a Well |
| 01/23/2013 | CN202689988U Hydraulic returnable salvage cylinder |
| 01/23/2013 | CN202689987U Fishing cylinder for downhole droppings |
| 01/23/2013 | CN202689986U High-temperature hydraulic top jar |
| 01/23/2013 | CN202689985U Suspension device for salvage gear of inner cylinder of wire line coring tool |
| 01/23/2013 | CN202689984U Intercommunicating and fishing integrated tool |
| 01/23/2013 | CN202689946U Deep hole salvage drilling tool |
| 01/22/2013 | US8357639 Nanoemulsions |
| 01/17/2013 | WO2013009458A2 Remotely activated downhole apparatus and methods |
| 01/17/2013 | US20130014958 Retrievable stimulation frac (rsf) plug |
| 01/17/2013 | US20130014941 Remotely Activated Downhole Apparatus and Methods |
| 01/17/2013 | CA2839010A1 Remotely activated downhole apparatus and methods |
| 01/16/2013 | CN202673222U Coiled tubing delivering perforation tubular column hydraulic pressure release device |
| 01/16/2013 | CN202673221U Unfreezing oscillator for dropped thing in well |
| 01/16/2013 | CN202673220U Ejector for blocking removal |
| 01/16/2013 | CN202673219U Well passing tool for well completion of branched well |
| 01/16/2013 | CN202673218U Secret chamber hole control idling anti-theft lock and key |
| 01/16/2013 | CN102877809A Seal fishing mechanism for tubing collar |
| 01/09/2013 | CN202659228U Perforation pressure gage, dispenser of perforation pressure gage and fisher of perforation pressure gage |
| 01/09/2013 | CN202659197U Guiding shoe type fishing spear |
| 01/09/2013 | CN202659196U Rope fisher |
| 01/09/2013 | CN202659195U Incision-salvage device for drill pipes and casing pipes |
| 01/09/2013 | CN102003169B Method for repairing accident well of coal bed methane multi-branch horizontal well |
| 01/08/2013 | US8347964 Releasing and recovering tool |
| 01/03/2013 | WO2011153180A3 Selective control of charging, firing, amount of force, and/or direction of fore of one or more downhole jars |
| 01/03/2013 | US20130000909 Jarring Method and Apparatus Using Fluid Pressure to Reset Jar |
| 01/03/2013 | US20130000884 Downhole tool and method |
| 01/02/2013 | CN202645487U Strong magnetic fisher |
| 01/02/2013 | CN102852480A 深井打捞机 Deep salvage machine |
| 01/02/2013 | CN102852477A Electric salvage device |
| 01/02/2013 | CN101545363B Spiral drill rod fisher |
| 12/26/2012 | CN202628009U Electronic multiple-shot clinometer bit hook |
| 12/26/2012 | CN202628008U Seat seal valve plug fishing component and fishing device thereof |
| 12/26/2012 | CN202628007U Fishing head of electronic multiple-shot clinometer |
| 12/25/2012 | US8336626 Downhole magnetic retrieval devices with fixed magnetic arrays |
| 12/19/2012 | CN202611648U Rubber anti-dropping fisher for water aspirator |
| 12/19/2012 | CN202611647U Side window hinge fisher |
| 12/19/2012 | CN202611646U Down-hole fishing tool for fishing small dropped objects at hole bottom |
| 12/19/2012 | CN202611645U Electromagnetic fishing device for drilling well and powered by underground turbine generator |
| 12/19/2012 | CN202611644U Water injection well completion string |
| 12/19/2012 | CN202611643U Cable drifting gauge |