| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 01/25/2012 | CN202125289U Sliding sleeve assembly of selective switch |
| 01/25/2012 | CN202125275U Drilling-plug-free tool for top cementing of horizontal well sieve tube |
| 01/25/2012 | CN202125270U Safe spear blanking plug |
| 01/21/2012 | CA2709359A1 Jar with improved valve |
| 01/19/2012 | WO2012009383A2 Power tong unit |
| 01/19/2012 | WO2011109373A3 Increased energy impact tool |
| 01/18/2012 | CN202117605U Oilfield salvage anchor head |
| 01/18/2012 | CN202117604U Oil well salvaging guide shoe |
| 01/18/2012 | CN202117603U Fishing device of drilling machine |
| 01/18/2012 | CN202117600U Direct control dropping and fishing device |
| 01/12/2012 | WO2011146250A3 Downhole magnetic retrieval devices with fixed magnetic arrays |
| 01/12/2012 | WO2011061506A3 Tubular retrieval |
| 01/11/2012 | CN202108453U Bushing back-off restrictor |
| 01/11/2012 | CN202108452U Lifting salvage cylinder for horizontal well |
| 01/11/2012 | CN202108451U Shoe guide cylinder of salvaging tool |
| 01/11/2012 | CN202108439U 丢手工具 Throw hand tools |
| 01/11/2012 | CN202108425U Guide shoe quickly-mounting adapter |
| 01/11/2012 | CN102312659A Pollution-free well workover process for oil field |
| 01/11/2012 | CN101493000B Rotary jar |
| 01/10/2012 | US8091935 Internal release connector and method |
| 01/05/2012 | WO2012003084A2 Installation system with force generating tool |
| 01/04/2012 | EP2401472A1 Head assembly |
| 01/04/2012 | CN202100238U Underground 360-degree bit-rotating and descaling sampler |
| 01/04/2012 | CN202100225U Impacting fishing head |
| 01/04/2012 | CN202100224U Expansible instrument fishing collar |
| 01/04/2012 | CN202100223U Integral type fishing cup mill shoes |
| 01/04/2012 | CN202100222U Self-suction type multi-functional fishing basket |
| 01/04/2012 | CN102305041A Production well blanking plug salvage cylinder |
| 01/04/2012 | CN102305022A Salvage-type casing pipe drilling tool for drilling |
| 01/03/2012 | CA2663004C Method and apparatus to vibrate a downhole component |
| 12/29/2011 | WO2011083311A3 Downhole tool releasing mechanism |
| 12/29/2011 | US20110315378 Insulating or modified conductivity casing in casing string |
| 12/28/2011 | CN202090875U 可打捞井下蓄能式水力脉冲工具 Underground Storage can salvage, hydraulic pulse tools |
| 12/28/2011 | CN102296939A 自动平衡压力胀捞一体化膨胀管工具及其使用方法 Automatic integration of the equilibrium pressure expansion pipe expansion of fishing tools and methods of use |
| 12/27/2011 | US8082999 Drilling and completion deflector |
| 12/22/2011 | US20110308789 Surface to borehole electromagnetic surveying using metallic well casings as electrodes |
| 12/21/2011 | CN202081850U 一种可退可倒卡瓦捞筒 One kind of fishing retreat can slip down the barrel |
| 12/21/2011 | CN202081849U 反循环打捞杯 Reverse Circulation Junk Cup |
| 12/21/2011 | CN202081848U 小件落物打捞篮 Small pieces of litter junk basket |
| 12/21/2011 | CN202081834U 一种抗扭强度高的套铣管螺纹结构 A set of high torsional strength structural pipe thread milling |
| 12/15/2011 | WO2011130523A3 A tool for removing debris from a wellbore |
| 12/14/2011 | CN202073526U 带压作业尾管封堵成套装置 Pressure sealing tailpipes complete installation work |
| 12/14/2011 | CN102278086A 一种捞矛头防倒结构 One kind of fishing spearhead anti-down structure |
| 12/13/2011 | US8074716 Tension-activated fluid bypass device and associated method |
| 12/08/2011 | WO2011153180A2 Selective control of charging, firing, amount of force, and/or direction of fore of one or more downhole jars |
| 12/08/2011 | WO2011153058A2 Magnetic retrieval apparatus and method for retaining magnets on downhole magnetic retrieval apparatus |
| 12/08/2011 | US20110297380 Selective control of charging, firing, amount of force, and/or direction of force of one or more downhole jars |
| 12/08/2011 | CA2800607A1 Selective control of charging, firing, amount of force, and/or direction of force of one or more downhole jars |
| 12/07/2011 | CN202064868U 咬合式光杆提放器 Engagement rod is put up |
| 12/07/2011 | CN202064867U 强磁式油气井下捞球专用工具 Magnetic ball-type oil and gas downhole fishing special tools |
| 12/01/2011 | WO2011149668A1 Wellbore debris cleanout assembly and method to remove debris from a debris catcher |
| 12/01/2011 | US20110290505 Drilling and Completion Deflector and Method of Using |
| 11/30/2011 | CN202055790U 一种捞矛头防倒结构 One kind of fishing spearhead anti-down structure |
| 11/30/2011 | CN202055789U 一种高性能的抽油杆打捞筒 A high performance rod overshot |
| 11/30/2011 | CN202055788U Rock core fisher |
| 11/30/2011 | CN202055787U Fishing tool of reversed drilling tools |
| 11/30/2011 | CN202055786U 一种通井规 One kind of regulation through Wells |
| 11/30/2011 | CN102261229A 一种模拟小井眼打捞工具的造扣方法及装置 An analog slimhole salvage tool manufacturing deduction method and apparatus |
| 11/24/2011 | WO2011146251A1 Dual-pole magnetic attraction downhole magnetic retrieval apparatus |
| 11/24/2011 | US20110285155 Magnetic Retrieval Apparatus and Method for Retaining Magnets on a Downhole Magnetic Retrieval Apparatus |
| 11/24/2011 | US20110284240 Mechanism for activating a plurality of downhole devices |
| 11/24/2011 | US20110284211 Retaining and Isolating Mechanisms for Magnets in a Magnetic Cleaning Tool |
| 11/24/2011 | US20110284210 Dual-Pole Magnetic Attraction Downhole Magnetic Retrieval Apparatus |
| 11/24/2011 | US20110284203 Downhole Magnetic Retrieval Devices with Fixed Magnetic Arrays |
| 11/23/2011 | CN202047773U Anti-dropping magnet fisher |
| 11/23/2011 | CN202047772U Expansion and salvage integrated expansion pipe assembly |
| 11/16/2011 | CN202039808U Novel drilling tool overshot |
| 11/16/2011 | CN202039807U Milling and fishing type well drilling tool |
| 11/15/2011 | CA2516189C Downhole measurements during non-drilling operations |
| 11/10/2011 | WO2011137483A1 A fishing tool for attaching to the head of an object, typically down a borehole or drill hole |
| 11/10/2011 | WO2004092527A3 Apparatus for radially expanding and plastically deforming a tubular member |
| 11/09/2011 | CN202031512U Large-caliber core drill bit for coal seam gas |
| 11/08/2011 | US8052176 Connection apparatus and method |
| 11/02/2011 | CN202023522U Caber fisher |
| 11/02/2011 | CN102230366A Direct-control throwing and refloating device |
| 11/01/2011 | US8048829 Spotting fluid compositions and associated methods |
| 11/01/2011 | US8048828 Spotting fluid compositions and associated methods |
| 10/20/2011 | WO2011130523A2 A tool for removing debris from a wellbore |
| 10/19/2011 | CN202012322U Left hand fishing spear |
| 10/19/2011 | CN202012321U Drilling tool fishing device |
| 10/19/2011 | CN202012320U Fisher used underground |
| 10/19/2011 | CN202012318U Mill shoes |
| 10/19/2011 | CN102220850A Oil pipeline hydraulic jacking releasing device for well repair of offshore oil and gas production platform |
| 10/18/2011 | CA2654783C Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 10/12/2011 | EP1792053B1 A highly-parallel, implicit compositional reservoir simulator for multi-million-cell models |
| 10/12/2011 | CN202007641U Full hydraulic while-drilling accelerator |
| 10/06/2011 | US20110240375 Downhole apparatus |
| 10/05/2011 | CN202000944U Multifunctional combined sliding block trip spear |
| 10/05/2011 | CN202000943U Spirally-guided retrievable salvaging spear |
| 10/05/2011 | CN202000942U Fishing device of well casing |
| 10/04/2011 | CA2681471C A hydraulic jar and an overpressure relief mechanism therefore |
| 09/30/2011 | CA2698572A1 Downhole apparatus |
| 09/28/2011 | CN201991474U 强磁打捞器 Magnetic fisher |
| 09/22/2011 | US20110226478 Wellbore Plug and Method |
| 09/21/2011 | CN201982049U 修井用反循环打捞筒 Workover overshot by reverse circulation |
| 09/21/2011 | CN201982048U 一种可回收式无线随钻测量仪打捞装置 A recyclable wireless MWD salvage equipment |
| 09/21/2011 | CN201982047U 一种可回收式无线随钻测量仪释放装置 A recyclable wireless MWD release device |
| 09/15/2011 | US20110220358 Assemblies for the purification of a reservoir or process fluid |
| 09/15/2011 | US20110220345 Dual Acting Locking Jar |
| 09/14/2011 | CN201972643U 一种防劈捞矛 An anti-hack spear fishing |