Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 31 - Fishing for or freeing objects in boreholes or wells
Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788)
07/2010
07/15/2010US20100175870 Downhole disconnect mechanism
07/14/2010CN201526294U Fishing tool for water well
07/14/2010CN101775977A Dual-tube injection well safety production string
07/13/2010US7753124 Autonomous magnetic sleeve for a riser
07/13/2010US7753116 Double-acting jar
07/13/2010US7753114 Magnetic wellbore cleaning tool
07/13/2010US7753113 Modular junk basket device with baffle deflector
07/13/2010CA2440894C Double-cone device and pump
07/07/2010CN101769129A Integral layering gas recovery technology tubular column and application method thereof
07/06/2010CA2449506C Downhole tool
06/2010
06/30/2010CN201517385U Multifunctional fishing tool for oil and gas field
06/30/2010CN201517384U Full hydraulic drilling jar
06/30/2010CN101761318A Underground hydraulic pressure back-off device
06/23/2010CN201513150U Non-destructive drilling pipe fisher
06/23/2010CN201513149U Spiral fishing hook
06/23/2010CN201513122U Lateral wall reinforcing center drill rig of ropes
06/23/2010CN101748982A Box tap washover fishing tool
06/16/2010CN201507262U Salvaging and taking device
06/09/2010CN101184904B Method and means for providing time delay in downhole well operations
06/08/2010CA2563860C Controlled shared load casing jack system and method
06/03/2010WO2010062186A1 Down hole actuator
06/02/2010CN201496021U Submersible motor set fishing device
06/02/2010CN201496020U Steel rope latch jack
06/02/2010CN201496019U Fixed valve salvage device of soft plunger piston oil extracting pump
06/02/2010CN201496018U Single-core cable oil field deep well drifting instrument
06/02/2010CN101550811B Lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool
06/01/2010CA2460688C Wellbore recovery operation
05/2010
05/26/2010CN201486501U Multifunctional fishing spear
05/26/2010CN201486500U Multifunctional overshot
05/26/2010CN201486499U Hydraulic jam releasing device for drilling tool
05/26/2010CN201486498U Borer breaking and pulling device
05/25/2010US7721809 Wellbore instrument module having magnetic clamp for use in cased wellbores
05/19/2010CN201474645U Oil and gas well head ball catching device
05/19/2010CN201474642U Stable feeding drilling jar
05/19/2010CN201474641U Set of eccentric wash over pipe, milling shoe, mill pyramid and milling rod workover tools
05/19/2010CN101139915B Casing milling salvaging adaptor for oil well
05/18/2010CA2621033C Bearing assembly for swivel joint
05/14/2010WO2010132807A2 Packer retrieving mill with debris removal
05/14/2010CA2761304A1 Packer retrieving mill with debris removal
05/13/2010US20100116499 Internal Release Connector and Method
05/13/2010US20100116487 Internal Release Connector and Method
05/12/2010CN201460849U Two-stage water injection speed controller
05/12/2010CN201460810U Casing and fishing type gas-lift check valve
05/12/2010CN201460786U Fishing device for underground deep water pump water pipe
05/12/2010CN201460785U Bottom-hole fallen object fisher
05/12/2010CN201460777U Novel dragger for polymer flooding quality and pressure separating well
05/12/2010CN201460756U Side-opening type quick connector with protecting mechanism
05/05/2010CN201448080U Wash-over milling fishing integrated tool
05/05/2010CN201448079U Fishing device for rope drilling tool
05/04/2010US7708072 Accessories and method for hollow stem auger retraction
04/2010
04/29/2010WO2010048454A1 External grip tubular running tool
04/29/2010US20100101781 Coupling For Downhole Tools
04/29/2010CA2741532A1 External grip tubular running tool
04/28/2010CN201443379U Selective mining process unit adopting single pump pressure balance method
04/28/2010CN201443328U Fishing tandem device for well cementation
04/28/2010CN201443327U Flexible drift size gauge tool
04/28/2010CN201443326U Horizontal well telescopic printing lead stamp
04/22/2010WO2010007434A3 Improved downhole tool
04/22/2010US20100096849 Internal Release Connector and Method
04/21/2010EP2176504A1 Multi-purpose well servicing apparatus
04/21/2010CN201439695U Pair-buckle type reversing overshot
04/21/2010CN201439694U Taking and changing sleeve cutting salvage device
04/21/2010CN201439693U Fishing tool
04/20/2010US7699113 Apparatus and methods for running liners in extended reach wells
04/20/2010US7698982 Explosive pipe severing tool
04/20/2010CA2610155C Casing and drill pipe filling and circulation apparatus
04/14/2010EP2173966A2 Method and apparatus for decreasing drag force of trigger mechanism
04/14/2010CN201437699U Intelligent well-dredging device for deep well on oil field
04/07/2010CN101691834A Inner tube-free drillable-retrievable grading cementing well completion technology
04/06/2010US7690430 Well casing extraction accessories and method
03/2010
03/31/2010EP2167785A1 Magnet fixing device in a cleaning tool
03/25/2010US20100071894 Electromagnetic based system and method for enhancing subsurface recovery of fluid within a permeable formation
03/24/2010CN201428409Y Quick-release fisher
03/24/2010CN201428408Y General overshot for oil well workover operation
03/24/2010CN201428407Y Irregular litter latch jack
03/17/2010CN201424933Y Fishing tool for small-diameter tube in drill hole
03/10/2010CN201420521Y Mechanical drilling jar with adjustable on-site jarring force
03/09/2010US7673683 Well tool having magnetically coupled position sensor
03/03/2010CN201416403Y Novel oilwell intercepting device
02/2010
02/25/2010WO2009137720A3 Drilling jar
02/25/2010WO2008127740A3 Tubular running tool and methods of use
02/24/2010EP2156011A2 Methods and apparatus for borehole sensing including downhole tension sensing
02/24/2010CN201412101Y Long-cartridge one-piece combination tool capable of milling and salvaging
02/24/2010CN201412100Y Wire rope fishing tool
02/24/2010CN201412087Y Winch for measuring deep well and salvaging inclinometer
02/23/2010US7665531 Apparatus for facilitating the connection of tubulars using a top drive
02/23/2010US7665530 Tubular grippers and top drive systems
02/18/2010WO2009134886A3 Vibrating downhole tool
02/17/2010CN201407004Y Double-bottom drilling bucket of rotary drilling rig
02/16/2010US7661726 Internal release connector and method
02/16/2010US7661477 System and method for unsticking a tool stuck in a wellbore
02/13/2010CA2686746A1 Method for removing a consumable downhole tool
02/10/2010CN201401143Y Pulse cavitation swirl generator
02/09/2010CA2620068C Cable hanger for use in a cable guided fishing assembly
02/04/2010US20100025113 Method of Circulating While Retrieving Downhole Tool in Casing
02/04/2010US20100025047 Method and apparatus for retrieving an assembly from a wellbore
02/03/2010CN201396095Y Rubber-cylinder fishing device
02/03/2010CN201396094Y Strong fishing magnet for separate-layer fracturing steel balls under gas recovery well
02/03/2010CN201396093Y Hydraulic pressure fishing gear
02/03/2010CN201396089Y Subsurface pressure gauge delivering and fishing device
1 ... 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 ... 38