| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 04/27/2011 | CN201810240U Quick breaking-down well cleanup device by high-temperature gas jet flow |
| 04/26/2011 | US7931085 Internal release connector and method |
| 04/21/2011 | US20110088903 Instrumented disconnecting tubular joint |
| 04/21/2011 | US20110088890 Multiple magnetic sensor ranging method and system |
| 04/20/2011 | EP2312115A2 Improved tubular running tool |
| 04/20/2011 | EP2310621A2 Improved downhole tool |
| 04/20/2011 | CN201802336U Stratified water injection quick withdrawal fishing head |
| 04/20/2011 | CN201802335U Tube well deep hook fishing device |
| 04/20/2011 | CN201802329U Underground hydraulic back-off no-load starting expansion piece |
| 04/14/2011 | WO2011044411A2 Compact jar for dislodging tools in an oil or gas well |
| 04/14/2011 | US20110083851 Compact Jar for Dislodging Tools in an Oil or Gas Well |
| 04/14/2011 | CA2776758A1 Compact jar for dislodging tools in an oil or gas well |
| 04/13/2011 | CN1936266B Oil-well low-frequency acoustic vibration unblocking and yield-increasing apparatus and method |
| 04/13/2011 | CN102016224A Tubular running tool and methods of use |
| 04/12/2011 | US7921926 Jointed spearhead assembly |
| 04/07/2011 | WO2010145984A3 Overshot device |
| 04/06/2011 | EP2304159A2 Signal operated tools for milling, drilling, and/or fishing operations |
| 04/06/2011 | CN201786306U Hydraulic inner clamping drill rod fisher |
| 04/06/2011 | CN201786305U Tool for taking roller cone drill rod out of drilled hole |
| 04/06/2011 | CN201786304U Fishing tool for back-off packer |
| 04/06/2011 | CN201786303U Full hydraulic jar knocker during drilling |
| 04/06/2011 | CN102003169A Method for repairing accident well of coal bed methane multi-branch horizontal well |
| 04/06/2011 | CN102003156A Grabbing device for deep well |
| 03/30/2011 | CN201778718U Anti-ejection locking fishing spear |
| 03/30/2011 | CN201778717U Novel underground fishing tool |
| 03/30/2011 | CN201778716U Sealed spear |
| 03/30/2011 | CN201778715U Universal flare-opening catcher of drilling rod |
| 03/30/2011 | CN201778714U Overshot for downhole operation of oilfield |
| 03/30/2011 | CN201778713U Underground special fisher for oil field |
| 03/30/2011 | CN201778712U Special fishing tool of slip-type underground throttleer |
| 03/30/2011 | CN101994496A Method for treating drilling tool jamming accident in coalbed methane multi-branch horizontal well |
| 03/29/2011 | US7913756 Method and apparatus for demagnetizing a borehole |
| 03/29/2011 | CA2465658C Orientation device for a core sample |
| 03/23/2011 | CN201771458U Apparatus for expanding well and salvaging |
| 03/23/2011 | CN201771457U Drilling dropping corestone fisher |
| 03/23/2011 | CN201771456U Drill bit fisher |
| 03/23/2011 | CN201771455U Cut-and-thread fishing tool for broken fish-tops |
| 03/23/2011 | CN201771454U Recyclable drilling rig |
| 03/23/2011 | CN101988377A Energy storage type salvageable underground hydraulic impulse tool |
| 03/23/2011 | CN101988375A Intelligent tractor hoist of deep well in oil field |
| 03/17/2011 | WO2011031528A2 Methods and apparatus for manipulating and driving casing |
| 03/17/2011 | WO2011031164A1 Well tool and method for severing and withdrawing a pipe section from a pipe string in a well |
| 03/17/2011 | WO2010144583A3 Contaminant excluding junction and method |
| 03/16/2011 | EP2295711A2 Well fishing method and system |
| 03/16/2011 | EP1846531B1 Spotting fluid compositions and associated methods |
| 03/16/2011 | CN201763318U Wireless centering fishing head while drilling |
| 03/16/2011 | CN201763289U Fisher for underground testing instruments |
| 03/16/2011 | CN201763274U Pumping unit well wire rope extender |
| 03/15/2011 | US7905289 Double-acting jar compounder |
| 03/10/2011 | WO2011028448A2 Debris catcher with retention within screen |
| 03/09/2011 | CN201756915U High pressure water jet rotation blocking removing yield-increasing injection-increasing apparatus |
| 03/08/2011 | US7900695 Well pump device |
| 03/03/2011 | WO2011002338A3 Hydraulic jar |
| 03/03/2011 | WO2010142949A3 Downhole tubular lifter and method of using the same |
| 03/03/2011 | WO2010135245A3 Intelligent debris removal tool |
| 03/03/2011 | WO2010132807A3 Packer retrieving mill with debris removal |
| 02/24/2011 | WO2011022346A2 Spoolable coiled tubing spear for use in wellbores |
| 02/24/2011 | WO2009135047A3 Mobile hydraulic workover rig |
| 02/24/2011 | US20110042101 Latching mechanism for changing pump size |
| 02/23/2011 | EP2286059A2 Downhole debris removal tool |
| 02/17/2011 | WO2011019926A2 Optimized machining process for cutting tubulars downhole |
| 02/17/2011 | US20110036574 Spoolable coiled tubing spear for use in wellbores |
| 02/17/2011 | US20110036564 Retrievable Bridge Plug |
| 02/16/2011 | EP2283204A1 Consumable downhole tool |
| 02/16/2011 | CN201747311U Dual-power electro-hydraulic workover rig |
| 02/15/2011 | CA2372355C Method and apparatus to vibrate a downhole component |
| 02/10/2011 | US20110030955 Hydraulically Powered Fishing Tool and Method |
| 02/10/2011 | US20110030944 Jarring tool with micro adjustment |
| 02/09/2011 | CN201738858U Sucker rod socket |
| 02/09/2011 | CN201738857U Holding type fisher for jammed sandstone-type uranium deposit logging probes |
| 02/09/2011 | CN201738856U Seeking and fishing device for underground exploring pipe |
| 02/09/2011 | CN201738855U Salvaging hydraulic force increasing device |
| 02/06/2011 | CA2711085A1 Hydraulically powered fishing tool and method |
| 02/03/2011 | US20110024119 Downhole debris removal tool |
| 02/03/2011 | US20110024118 Well Fishing Method and System |
| 02/02/2011 | CN201730572U Milling shoe for oil drilling |
| 02/02/2011 | CN101963045A Slag salvaging drill of slurry roller bit and slag salvaging basket |
| 02/01/2011 | US7878242 Interface for deploying wireline tools with non-electric string |
| 01/26/2011 | CN101956538A Hydraulic retractable fishing spear |
| 01/25/2011 | US7874364 Method for jarring with a downhole pulling tool |
| 01/20/2011 | US20110011588 Tension-Activated Fluid Bypass Device |
| 01/20/2011 | US20110011580 Wireless transfer of power and data between a mother wellbore and a lateral wellbore |
| 01/19/2011 | CN201714326U Horizontal drill drilling stem clamping puller |
| 01/18/2011 | CA2439331C Method of stabilizing a downhole drilling motor and a downhole drilling motor |
| 01/12/2011 | CN201705263U Combination releasable fishing socket |
| 01/12/2011 | CN201705262U Detachable strong magnetic fisher with small diameter |
| 01/12/2011 | CN201705261U Magnetic valve fishing tool |
| 01/12/2011 | CN201705260U Hydraulic jet deplugging device |
| 01/06/2011 | WO2011002338A2 Hydraulic jar |
| 01/06/2011 | US20110000682 Method and Apparatus for Making Up and Breaking Out Threaded Tubular Connections |
| 01/06/2011 | US20110000663 Device for plug removal |
| 01/06/2011 | CA2767086A1 Hydraulic jar |
| 01/05/2011 | CN201695980U Slider overshot |
| 01/05/2011 | CN201695979U Jam release fishing tool suitable for corroded and deformed oil pipe |
| 01/05/2011 | CN201695975U Safe salvaging and conveying device for extracting core of deep-hole rope |
| 01/04/2011 | US7861772 Packer retrieving mill with debris removal |
| 12/29/2010 | CN201687426U Multifunctional multi-fishing type fishing spear |
| 12/29/2010 | CN201687425U Solid body ground fishing device in well |
| 12/28/2010 | US7857065 Device for selective movement of well tools and also a method of using same |
| 12/23/2010 | WO2010145984A2 Overshot device |