| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
|---|
| 12/25/2008 | US20080314592 Microemulsion or In-Situ Microemulsion for Releasing Stuck Pipe |
| 12/23/2008 | CA2562059C Latch mechanism guide |
| 12/18/2008 | WO2008153406A1 Liquid pressure driven sequential valve for axially operative jar |
| 12/17/2008 | EP1540129B1 Downhole drill string having a collapsible subassembly |
| 12/17/2008 | CN201165858Y Double-disc type hydraulic brake hydraulic-mechanical transmission roller |
| 12/16/2008 | CA2441138C Removal of tubulars from wells |
| 12/10/2008 | CN201162510Y Auger stem latch jack |
| 12/10/2008 | CN201162509Y Releasable three-ball latch jack |
| 12/10/2008 | CN101319600A Drill extractor of bored pile |
| 12/10/2008 | CN100441829C Slant device capable of recovering and fishing tool thereof |
| 11/20/2008 | WO2008118697A3 Casing profiling and recovery system |
| 11/19/2008 | EP1356009B1 Spotting fluid for differential sticking |
| 11/19/2008 | CN201152241Y Pump of constant weight and torque |
| 11/19/2008 | CN201152158Y Block-proof drift size gauge tool |
| 11/19/2008 | CN101307678A Pumping rod salvager |
| 11/18/2008 | US7451834 Impact enhancing apparatus and method |
| 11/12/2008 | CN201148853Y Complete hydraulic type drilling jar |
| 11/04/2008 | CA2421211C Method and device to free stuck objects |
| 10/29/2008 | CN201141291Y Scraping type glue barrel recoverer |
| 10/29/2008 | CN201141290Y Shocking device in minor-diameter hole |
| 10/23/2008 | WO2008127838A1 Devices and methods for translating tubular members within a well bore |
| 10/23/2008 | WO2008127258A1 Sucker rod fishing tool |
| 10/22/2008 | EP1723307B1 A jar for use in a downhole toolstring |
| 10/22/2008 | CN201137469Y Down-hole hydraulic reversing device |
| 10/16/2008 | US20080252088 Sucker rod fishing tool |
| 10/16/2008 | US20080251254 Devices and methods for translating tubular members within a well bore |
| 10/15/2008 | CN201133225Y Whipstock salvaging tool |
| 10/14/2008 | US7436184 Well logging apparatus for obtaining azimuthally sensitive formation resistivity measurements |
| 10/07/2008 | CA2509468C Release tool for coiled tubing |
| 10/02/2008 | WO2008118697A2 Casing profiling and recovery system |
| 10/01/2008 | CN201125696Y Portable type repair well salvaging drip |
| 10/01/2008 | CN201125695Y Bridging plug milling bailer |
| 10/01/2008 | CN201125689Y Deflecting tool for steel wire throwing and fetching operation |
| 09/25/2008 | WO2008115952A1 A hydraulic jar and an overpressure relief mechanism therefore |
| 09/24/2008 | CN201121498Y Lever dragging machine |
| 09/24/2008 | CN201121497Y Multifunctional drift well gauge tool |
| 09/23/2008 | US7427091 Spear head overshot for use in a cable guided fishing assembly |
| 09/18/2008 | US20080223584 Downhole retrieving tool and method |
| 09/17/2008 | EP1502001B1 Packer retriever |
| 09/17/2008 | CN201116458Y Sand flushing reducing fishing spear |
| 09/17/2008 | CN201116457Y Combined type overshot |
| 09/17/2008 | CN101265787A Telescopic type boring tool salvaging device |
| 09/16/2008 | CA2552031C Mill and pump-off sub |
| 09/11/2008 | US20080217014 Overshot tool |
| 09/03/2008 | CN201110147Y Fishing-out tool for exchanging gas-lift valve |
| 09/03/2008 | CN201110144Y Core-fetching throwing dragging machine for cable |
| 09/02/2008 | CA2389671C Device for manipulating a tool in a well tubular |
| 08/27/2008 | CN201106429Y Apparatus for pumping sand in oil field down-hole |
| 08/20/2008 | CN201103362Y Salvaging tool for processing down-hole accident by steel wire operation |
| 08/20/2008 | CN201103361Y Salvaging device for down-hole remaining rubber |
| 08/20/2008 | CN201103360Y Underground falling objects salvaging barrel |
| 08/14/2008 | WO2008095233A1 Underground unlatch overshot |
| 08/13/2008 | CN201100112Y A wrecking spear for under-well drop |
| 08/13/2008 | CN201100111Y Removable card tile bushing hoping and positioning wrecker |
| 08/13/2008 | CN201100110Y A driller milling wrecking male wimble |
| 08/12/2008 | CA2486914C Mitigation of proppant sticking in removing downhole tools |
| 08/07/2008 | US20080185151 Hydrocarbon production system and method of use |
| 08/06/2008 | CN201095978Y Well logging salvaging oil extraction vehicle |
| 08/06/2008 | CN201095967Y Movable claw grappling tool |
| 07/30/2008 | CN201092837Y Dredge special for down-hole exploring-draining borehole block-resistant hole |
| 07/30/2008 | CN201092834Y High-efficiency milling integrated well-repairing tool |
| 07/30/2008 | CN100406674C Reverse buckling equipment |
| 07/23/2008 | CN201090166Y Salvaging callback cover mill shoe multiple-limb well |
| 07/23/2008 | CN201090165Y Drilling bridging plug milling salvaging tool |
| 07/23/2008 | CN201090164Y Tool for helping to salvage and lift when repairing horizontal well |
| 07/23/2008 | CN201090163Y Ball righting type highly-effective concave bottom milling shoe |
| 07/22/2008 | CA2302977C Hydraulic drilling jar |
| 07/16/2008 | CN201087712Y Hollow stem salvaging barrel |
| 07/16/2008 | CN201087711Y Multipurpose guiding shoe for salvaging articles in well |
| 07/16/2008 | CN101219753A Underground uranolite and heavy thing latch jack |
| 07/09/2008 | CN201083100Y Casing milling salvaging adaptor for oil well |
| 07/09/2008 | CN201083099Y Plate-type multi-wheel salvaging equipment |
| 07/09/2008 | CN201083098Y Well head reinforcing device for steel wire salvaging and testing |
| 07/08/2008 | US7395862 Combination jar and disconnect tool |
| 06/26/2008 | US20080149340 Jars for wellbore operations |
| 06/26/2008 | US20080149339 Variable linkage assisted gripper |
| 06/18/2008 | CN201074492Y Left hand fishing spear with large obliqueness of oilfield horizontal well and receded horizontal section |
| 06/18/2008 | CN201074491Y Horizontal reinforcement card-dispelling tubular pile |
| 06/11/2008 | EP1929122A2 C-plate assembly for use in a cable guided fishing assembly |
| 06/11/2008 | EP1929120A2 Cable hanger for use in a cable guided fishing assembly |
| 06/11/2008 | EP1929119A2 Spear head overshot for use in a cable guided fishing assembly |
| 06/11/2008 | CN201071695Y Shock dispelling clip tubular pole for near clip point of continuous oil pipe |
| 06/11/2008 | CN201071694Y Anti-releasing and anti-abrasion lead stamp used for oil field horizontal well horizontal section workover |
| 06/10/2008 | US7385523 Apparatus and method for downhole well equipment and process management, identification, and operation |
| 06/10/2008 | US7383899 Spearhead assembly |
| 06/10/2008 | US7383876 Cutting tool for use in a wellbore tubular |
| 06/05/2008 | US20080128168 Apparatus and Method |
| 06/04/2008 | CN201068767Y Oilfield horizontal well horizontal segment hydraulic reversing sliding block salvaging spear |
| 06/04/2008 | CN201068766Y Lift-placing type retreating large scope salvaging spear |
| 06/04/2008 | CN201068765Y Down-hole fishing device |
| 06/04/2008 | CN201068764Y Retreating hydraulic slip spear |
| 06/04/2008 | CN201068763Y Scraping ¿Cproof automatic fish-attracting type retreating bailer |
| 06/04/2008 | CN201068762Y Lift-placing type retreating large scope salvaging barrel |
| 06/04/2008 | CN201068761Y Down-hole salvaging tool |
| 06/04/2008 | CN201068760Y Oilfield down-hole salvager |
| 06/04/2008 | CN201068759Y Shocking reversing stuck freeing salvaging pipe column |
| 06/04/2008 | CN201068758Y Reversing drill bumper jar shocking anti-stuck pipe column |
| 06/04/2008 | CN201068757Y Shocking reversing stuck freeing salvaging pipe column |
| 06/04/2008 | CN201068756Y Oilfield horizontal well horizontal segment falling object salvaging booster |
| 06/04/2008 | CN201068755Y Safe joint for horizontal well great pitch and horizontal segment salvaging construction |