| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 12/04/2013 | CN103422826A Multipurpose water pulse device used in well |
| 11/27/2013 | CN203310649U Underwater gripping device for criminal evidence collection |
| 11/27/2013 | CN203308435U Fast workover pipe column |
| 11/27/2013 | CN203308425U Well washing valve throttling plugging tool |
| 11/27/2013 | CN203308418U Oscillation device of fisher |
| 11/27/2013 | CN203308417U Jar for looseness of oil collection pipe coupling |
| 11/27/2013 | CN203308416U Multidirectional connector |
| 11/26/2013 | US8590613 Overshot with dynamic seal feature |
| 11/21/2013 | US20130306305 Vibration tool |
| 11/20/2013 | CN203296736U Releasing spear capable of being used for milling |
| 11/20/2013 | CN203296735U Fishing tool of circulation drilling bit |
| 11/20/2013 | CN203296734U Multi-head fishing device for recycling blanking plugs |
| 11/14/2013 | US20130299175 Downhole vacuum sub |
| 11/13/2013 | CN203285376U Well opening ball catching device |
| 11/13/2013 | CN203285375U Blocking gauge cutter |
| 11/07/2013 | WO2012120282A3 Tractor and jar assembly |
| 11/06/2013 | EP2659088A1 Hydraulic/mechanical tight hole jar |
| 11/06/2013 | CN203271678U Combined tapered mill for descaling and drifting |
| 11/06/2013 | CN203271653U Petroleum drilling tool combined type fishing joint |
| 11/06/2013 | CN103382829A Multi-stage fisher with dimension unknown inner pipe |
| 10/30/2013 | EP2655787A1 Tool for extracting an object engaged in a fluid exploitation pipe, extraction device and related method |
| 10/30/2013 | CN203257362U Gripping positioning device of stopper |
| 10/30/2013 | CN203257361U Oil well leaked article fishing tool |
| 10/30/2013 | CN203257360U Steel pipe concrete gravity hammer |
| 10/30/2013 | CN203257359U Coal mine drilling and hole penetrating device |
| 10/30/2013 | CN203256831U Combined and assembled precipitation well cleaning equipment |
| 10/30/2013 | CN103375142A Friction-type manometer casting and fishing device |
| 10/24/2013 | US20130277057 Hydraulic/Mechanical Tight Hole Jar |
| 10/23/2013 | CN203248109U Cable fishing device |
| 10/23/2013 | CN203248100U Salvage device with adjustable angle |
| 10/23/2013 | CN203248054U Hammering construction device |
| 10/22/2013 | US8561688 Compact jar for dislodging tools in an oil or gas well |
| 10/10/2013 | WO2012158575A3 Vortex controlled variable flow resistance device and related tools and methods |
| 10/10/2013 | US20130264051 Well tools selectively responsive to magnetic patterns |
| 10/09/2013 | CN203230396U Movable underground throttler |
| 10/09/2013 | CN203230368U Underground material salvaging device |
| 10/09/2013 | CN203230367U Elastic salvage barrel |
| 10/09/2013 | CN203230366U Oil field downhole fallen object salvage barrel |
| 10/09/2013 | CN203230364U Double-action throwing and fishing device |
| 10/09/2013 | CN203229986U Mud eliminating device for hydraulic excavator |
| 10/08/2013 | US8550155 Jarring method and apparatus using fluid pressure to reset jar |
| 10/03/2013 | WO2013147996A2 Optical casing collar locator systems and methods |
| 10/03/2013 | US20130256031 Down hole tool with adjustable fluid viscosity |
| 10/02/2013 | EP2643545A1 Fail safe locking overshot device |
| 10/02/2013 | CN103334712A Ground machine super jar |
| 09/26/2013 | US20130248253 Hydraulic jar with multiple high pressure chambers |
| 09/23/2013 | CA2772515A1 Hydraulic jar with multiple high pressure chambers |
| 09/18/2013 | EP2638238A1 Tool for recovering junk and debris from a wellbore of a well |
| 09/18/2013 | CN203201515U 井下打捞工具 Downhole Fishing Tools |
| 09/18/2013 | CN203201514U Continuous oil pipe vibration reinforcing device |
| 09/18/2013 | CN103306625A Short and light falling object washover overshot |
| 09/12/2013 | WO2013133718A1 Method for removal of casings in an underground well |
| 09/11/2013 | CN203188957U Corrugated male coupling tap |
| 09/11/2013 | CN203188956U Taper-ball-shaped hole type drilling tool picking head |
| 09/11/2013 | CN203188955U Drilling jar for drilling tool jam release |
| 09/11/2013 | CN203188954U Plate type strong magnetic fisher |
| 09/11/2013 | CN203188953U Corrugated female coupling tap |
| 09/11/2013 | CN103291264A Safety stripping device of in-well pipe string |
| 09/11/2013 | CN103291239A Vibrating method and device for fisher |
| 09/11/2013 | CN102174880B Releasing method applicable to packer layered sand fracturing string |
| 09/04/2013 | CN203175452U Multifunctional combined releasing overshot |
| 09/04/2013 | CN203175451U Novel underground fishing tool for oil field |
| 09/04/2013 | CN203175450U Rotary pulling piece type overshot |
| 09/04/2013 | CN203175449U Double-acting coring reverse circulation salvage basket |
| 09/04/2013 | CN203175448U Rotary jet flow negative pressure suction composite blockage removal device |
| 09/04/2013 | CN103277050A Recoverable whipstock and combined fishing tool thereof |
| 09/04/2013 | CN103276761A Sludge removing device of hydraulic excavator |
| 08/29/2013 | WO2013126358A1 Riser cutting tool |
| 08/29/2013 | US20130220617 Adjustable Engagement System for Tool Removal |
| 08/28/2013 | CN203161151U Low-density ball salvaging device |
| 08/28/2013 | CN203161150U Side fisher for fishing underground broken rod |
| 08/28/2013 | CN203161149U Semi-open type strong-magnetic salvage device |
| 08/28/2013 | CN203161146U Coring system performing coring with drilling |
| 08/27/2013 | CA2614980C Downhole force generator |
| 08/22/2013 | US20130214546 Fail safe locking overshot device |
| 08/21/2013 | EP2627858A1 3-ring non-extrusion seal assembly and method |
| 08/21/2013 | CN203145882U Sucker rod socket |
| 08/21/2013 | CN203145881U Refloatation covering milling tool |
| 08/21/2013 | CN203145880U Back-flushing type tubing plug fishing tool |
| 08/21/2013 | CN203145875U Transmission structure |
| 08/21/2013 | CN102305022B Salvage-type casing pipe drilling tool for drilling |
| 08/14/2013 | CN203130008U Circulating milling fishing hook |
| 08/14/2013 | CN103244068A Pressing cap structure of hydraulic jar |
| 08/13/2013 | US8506837 Field-responsive fluids |
| 08/13/2013 | US8505653 Downhole apparatus |
| 08/08/2013 | WO2013115655A1 A method and an apparatus for retrieving a tubing from a well |
| 08/07/2013 | CN203114225U Engineering drill eccentric catch hook |
| 08/07/2013 | CN203114224U Engineering drill extractor |
| 08/07/2013 | CN203114223U Tunnel shot hole digging device |
| 08/06/2013 | US8499836 Electrically activating a jarring tool |
| 08/01/2013 | US20130192852 Valve assembly |
| 07/31/2013 | CN203097793U Salvage tool of tripping instrument |
| 07/31/2013 | CN203097792U Rotary downhole fishing device for coiled tubing |
| 07/31/2013 | CN203097791U Delamination pulse boosting unblocking device for oilfield water injection well |
| 07/31/2013 | CN203097771U Force sensing positioning casting-fishing tool |
| 07/31/2013 | CN203097716U Combined drill column device for drilling of directional well |
| 07/31/2013 | CN103228864A Fail safe locking overshot device |
| 07/31/2013 | CN103225485A Releasing type spiral slip overshot |
| 07/30/2013 | US8496065 Release assembly for a downhole tool string |
| 07/30/2013 | US8496058 Well fishing method and system |