| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 07/25/2013 | US20130186689 Downhole tool with external housing torque transfer |
| 07/24/2013 | CN203081388U Fixed-hook-type external fishing hook |
| 07/24/2013 | CN203081387U Fishing barrel for sucker rod |
| 07/24/2013 | CN203081386U Spiral releasing overshot |
| 07/24/2013 | CN203081385U Special combined fishing barrel for electric pump well |
| 07/24/2013 | CN203081384U Guiding shoe in poking hook shape |
| 07/24/2013 | CN203081383U Eccentric sucker rod coupling salvage barrel |
| 07/24/2013 | CN203081382U Releasable fishing socket |
| 07/24/2013 | CN203081381U Fishing sleeve milling tool |
| 07/24/2013 | CN203081380U Movable elbow joint |
| 07/24/2013 | CN203081379U Broken and separated polish rod fishing device |
| 07/24/2013 | CN203081378U Hydraulic locking type flexible falling object fishing spear |
| 07/24/2013 | CN203081377U Circulation magnetic force refloating machine |
| 07/24/2013 | CN203081376U Recovery hook with single hook |
| 07/24/2013 | CN203081375U Smooth pigging tool for gas drilling vertical well |
| 07/18/2013 | WO2013043539A3 Well tractor with active traction control |
| 07/17/2013 | CN203066952U Acid-fracturing tubular column ball socket capable of being salvaged and used repeatedly |
| 07/17/2013 | CN203066922U Salvage mechanism applicable to while drilling coring |
| 07/17/2013 | CN203066921U Fisher for fishing eccentric wear fish top |
| 07/17/2013 | CN203066920U Oil field underground fishing device |
| 07/17/2013 | CN103206184A Internal fisher for objects falling into short pipes |
| 07/17/2013 | CN103206183A Hydraulic up-down jolting device |
| 07/17/2013 | CN101892815B Hydromechanical drilling jar |
| 07/11/2013 | WO2013025516A3 Debris barrier for hydraulic disconnect tools |
| 07/10/2013 | CN203050591U Profiled fishing drill bit |
| 07/04/2013 | WO2013101333A2 Apparatus and method for removing debris from a well |
| 07/04/2013 | US20130168092 Double-Acting Shock Damper for a Downhole Assembly |
| 07/04/2013 | US20130168091 Junk basket with self clean assembly and methods of using same |
| 07/04/2013 | US20130168080 Radial vibrational apparatus |
| 07/04/2013 | US20130168078 Release Assembly for a Downhole Tool String |
| 07/04/2013 | CA2856689A1 Apparatus and method for removing debris from a well |
| 07/03/2013 | CN203035161U Combined type detection drift well gauge |
| 07/03/2013 | CN203035148U Reducing steel wire fishing tool |
| 07/03/2013 | CN203035145U Fishable bottom plug and fishing tool for expansion pipe |
| 07/03/2013 | CN103189589A An attachment for percussion drill tools |
| 07/02/2013 | US8474522 Downhole material retention apparatus |
| 06/26/2013 | CN203022674U Die tap for salvaging tripping drill pipe under shaft |
| 06/26/2013 | CN203022673U Suppression pressure quick releasing mechanism for downhole jar |
| 06/26/2013 | CN203022672U Cable fisher |
| 06/26/2013 | CN203022669U Drilling system for taking core while drilling |
| 06/20/2013 | WO2013089753A1 Subsurface safety valve deployable via electric submersible pump |
| 06/20/2013 | WO2013036805A9 Pressure lock for jars |
| 06/20/2013 | US20130153227 Slickline or Wireline Run Hydraulic Motor Driven Mill |
| 06/19/2013 | EP2603659A2 An attachment for percussion drill tools |
| 06/19/2013 | CN203008835U Special drifting device for directionally inclined oilwell |
| 06/19/2013 | CN103161441A Impression block used for well repairing and fishing procedures |
| 06/19/2013 | CN103161420A Die tap fishing device for oil gas well |
| 06/19/2013 | CN103161419A Slip fishing barrel for oil gas well |
| 06/19/2013 | CN103161418A Hook fishing device for oil gas well |
| 06/19/2013 | CN101994496B Method for treating drilling tool jamming accident in coalbed methane multi-branch horizontal well |
| 06/19/2013 | CN101408095B Electrically activating a jarring tool |
| 06/13/2013 | WO2012162666A3 Tubular coupling device |
| 06/13/2013 | CA2858548A1 Resonant extractor system and method |
| 06/12/2013 | CN202990931U Special tubing fishing device for inclined oil well |
| 06/12/2013 | CN202990930U Special fishing device for sucker rod dropping into horizontal well |
| 06/12/2013 | CN202990929U Special inner fishing device for steel wire rope dropping into directional inclined shaft |
| 06/12/2013 | CN202990928U Special device for fishing roller bits in oil wells |
| 06/12/2013 | CN202990927U Special strong magnetic fishing device for scrap metals dropping into directional well |
| 06/12/2013 | CN202990926U Rotary excavating drill rod mandrel salvaging equipment |
| 06/12/2013 | CN103154423A 3-ring non-extrusion seal assembly and method |
| 06/12/2013 | CN103147712A Casing milling fishing collar for short and light fell articles |
| 06/06/2013 | WO2013079573A1 Pulling tool |
| 06/06/2013 | CA2856166A1 Pulling tool |
| 06/05/2013 | EP2599952A1 Pulling tool |
| 06/05/2013 | CN202970583U Basket type slip fishing barrel |
| 06/05/2013 | CN202970582U Numerical-control photographic oil pipe salvaging device |
| 06/05/2013 | CN202970581U Salvaging device of cables under oil well |
| 06/05/2013 | CN202970580U Novel fishing tool |
| 06/05/2013 | CN202970579U Fishing pliers for drill pipes |
| 06/05/2013 | CN202970578U Jarring accelerator used for salvage jam-release |
| 06/05/2013 | CN202970577U Super drilling jar |
| 06/05/2013 | CN202970576U Ground surface bumper jar for drill pipe release |
| 06/05/2013 | CN202970575U Blockage removing device adopting high-pressure jetting and negative-pressure pumping |
| 06/05/2013 | CN202970561U Oil well cleaning vehicle |
| 06/05/2013 | CN103132938A Transmission device of intelligent casting-pulling instrument |
| 06/04/2013 | US8454066 Grip extension linkage to provide gripping tool with improved operational range, and method of use of the same |
| 06/04/2013 | US8453727 Downhole rotational vibrator |
| 06/04/2013 | US8453724 Tool for recovering junk and debris from a wellbore of a well |
| 06/04/2013 | CA2792903C Overshot with pivotally mounted lifting dogs |
| 06/04/2013 | CA2510632C Connection apparatus and method |
| 05/29/2013 | CN202954767U Pothook assembly for pile hammer |
| 05/28/2013 | CA2480537C Downhole force generator and method for use of same |
| 05/23/2013 | WO2013073949A1 Apparatus and method for cutting and pulling of casing |
| 05/23/2013 | CA2850915A1 Apparatus and method for cutting and pulling of casing |
| 05/22/2013 | CN202946298U Salvage spear hydraulic power propeller |
| 05/22/2013 | CN202946083U Oil pipe joint hoop backing-off device for slim hole well |
| 05/22/2013 | CN202946082U Hydraulic type coring tool special salvage tool |
| 05/22/2013 | CN202946081U Adjustable three-ball fishing barrel |
| 05/22/2013 | CN202946080U Guide shoe for fishing tool of logging instrument |
| 05/22/2013 | CN202946079U Catch sleeve |
| 05/22/2013 | CN202946078U Lead mould fisher |
| 05/22/2013 | CN202946077U Backup device of whipstock anchor |
| 05/22/2013 | CN202946076U Ferromagnetic salvaging device |
| 05/22/2013 | CN202946075U Rubber salvaging device |
| 05/21/2013 | US8443875 Down hole tool with adjustable fluid viscosity |
| 05/16/2013 | WO2012083047A3 Multi-zone fracturing completion |
| 05/15/2013 | CN202937218U Pin fisher |
| 05/15/2013 | CN202937217U Rotating fishing spear |
| 05/15/2013 | CN202937216U Outer hook type spear capable of fishing in receding mode |
| 05/15/2013 | CN202937215U Small hole well oil pipe coupling back-off device |