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)
12/2012
12/19/2012CN202611639U Tool for coring along with drilling well wall
12/19/2012CN202611593U Simple drill
12/13/2012US20120312549 Tubular retrieval
12/12/2012CN202596665U Drum type oil pipe float valve
12/12/2012CN202596658U Packer for plugging water for fishable insert pipe switch
12/12/2012CN202596639U Redressing-type back-off device
12/12/2012CN202596638U External fishing hook for slide block
12/12/2012CN202596637U Delivery and fishing device for frictional pressure gauge
12/12/2012CN202596636U High-temperature hydraulic bumper jar
12/12/2012CN202596635U Drive-down bridge plug fishing tool
12/12/2012CN202596634U Special tool for steel wire rope lead striking mould
12/12/2012CN202596626U High-inclination well eccentric delivery support device
12/12/2012CN102817569A Underground grabbing and clamping fisher
12/11/2012CA2619175C Method and device for releasing a block on a bore-crown during a boring process
12/06/2012WO2012064500A8 Casing spears and related systems and methods
12/06/2012US20120305235 Tool for installing units in a well
12/05/2012CN202578613U Symmetric double-tooth fishing spear with water hole
12/05/2012CN202578612U Downhole latch jack
12/05/2012CN202578611U Tiger mouth salvage hook
12/05/2012CN202578610U Logging instrument fisher
12/05/2012CN202578609U Hinge type salvage barrel
12/05/2012CN202578608U Overshot with slot
12/05/2012CN202578607U Symmetrical internal and external combination hook
12/05/2012CN202578606U Plastic pipe fishing device with barbed barrel
12/05/2012CN202578605U Striking-while-drilling jar knocker
12/05/2012CN202578604U Drill pipe-fetching tool clamping hook
12/04/2012US8322413 Twin latch wireline retrieval tool
11/2012
11/29/2012US20120298369 Differential Pressure Wellbore Tool and Related Methods of Use
11/29/2012US20120298366 Well Fishing Method and System
11/29/2012US20120298365 Compact Jar for Dislodging Tools in an Oil or Gas Well
11/29/2012CA2837085A1 Tubular coupling device
11/28/2012CN202560143U Salvage device for exploration tube for kilometer drilling machine
11/28/2012CN202560142U Drill rod fishing device for kilometer drilling machine
11/28/2012CN202560141U Salvage device special for kilometer drilling machine hole bottom motor rotor
11/28/2012CN202560140U Novel underground slips fisher
11/28/2012CN202560139U Milling and fishing combination tool
11/28/2012CN102100952B Intelligent well hole lifesaving cradle
11/28/2012CN101726222B Adjustable-charge high-pressure resistance device for breakouting pack of dynamite
11/22/2012WO2012082463A4 Vacuum debris removal with articulated pickup and visual capability
11/22/2012CA2833767A1 Vortex controlled variable flow resistance device and related tools and methods
11/21/2012EP2524107A2 Tubular member adaptor apparatus
11/21/2012CN202545098U Downhole turbine generator system
11/21/2012CN202544792U Novel casing back-off positioning and finishing device
11/21/2012CN202544791U Spring-like fishing spear
11/21/2012CN202544790U Releasing slip socket for well repair
11/21/2012CN202544789U While-drilling jar
11/21/2012CN202544788U Elastic rope retainer
11/21/2012CN102787824A Tool and method for injecting cement into top of horizontal well screen pipe without drilling and plugging
11/15/2012US20120285687 Selective fracturing tool
11/15/2012US20120285686 Downhole Rotational Vibrator
11/14/2012EP2521833A2 Downhole tool releasing mechanism
11/14/2012CN202531496U Droppable and fishable gas injected injection pump for gas lift
11/14/2012CN202531077U Hydraulic withdrawable type double-slip spear
11/14/2012CN202531076U Die collar with elevator groove
11/14/2012CN202531075U Reverse circulation compound fishing tool in casing
11/14/2012CN202531074U Combined milling tool in sleeve
11/14/2012CN202531069U Fixed-angle salvage device
11/14/2012CN202531067U Dropping-salvaging head of gas lift valve
11/14/2012CN1940250B Active permanent-magnetic vibrator and block-proof and output-increasing method for oil well
11/14/2012CN102777146A Downhole junk overshot
11/07/2012CN202520264U Buffer type back-off telescopic compensator
11/07/2012CN202520263U Drill rod extractor
11/07/2012CN102767344A Salvage die tap
11/07/2012CN102767337A Sleeve type screw pile machine drill and construction method for eliminating barriers
11/01/2012WO2012091982A3 Plug-inducing matter and method of plugging a wellbore
11/01/2012US20120273193 Nmr analysis of unconventional reservoir rock samples
11/01/2012US20120273187 Detecting a Reamer Position through a Magnet Field Sensor
10/2012
10/31/2012CN202510078U Graded catch spear
10/31/2012CN202510077U Guiding sliding block trip spear
10/31/2012CN202510076U Leader pin cap
10/31/2012CN202510075U Guider die collar
10/31/2012CN202510074U Pilot milling shoe
10/31/2012CN202510073U Magnetic force fishing socket
10/31/2012CN102762813A Downhole tool releasing mechanism
10/31/2012CN102758594A Flat grind shoe
10/24/2012CN202500515U Downhole pressure-difference drilling-tool-jamming removal device
10/24/2012CN202500492U Retrievable drilling and completion whipstock used for oil drilling
10/24/2012CN102747977A Internal cutting device of hydraulic sleeve
10/24/2012CN102747976A Fishing needle, fishing device and fishing method for fishing a soft material in tube for oil gas well
10/24/2012CN102747973A Underground core-drilling machine
10/18/2012US20120261114 Downhole magnet tool and method of assembly
10/18/2012US20120261113 Cobble/small boulder debris device in borehole excavating
10/17/2012CN102733771A Fishing female tap
10/11/2012WO2012088132A3 Surface signal for flow blockage for a subterranean debris collection apparatus
10/11/2012WO2012082463A3 Vacuum debris removal with articulated pickup and visual capability
10/11/2012WO2012068054A4 Apparatus and method for adjusting spring preload in a downhole tool
10/10/2012CN202483511U Retrievable anti-blocking safety valve and special fishing tool thereof
10/10/2012CN202483494U Sliding type eccentric fishing tool
10/10/2012CN202483489U Feeding device of wireless measurement-while-drilling inclinometer
10/10/2012CN101769129B Integral layering gas recovery technology tubular column and application method thereof
10/08/2012CA2736679A1 Downhole magnet tool and method of assembly
10/04/2012WO2012129662A1 Overshot
10/03/2012CN202467735U Inclined-tooth type fixed point backoff dragging spear
10/03/2012CN202467734U Quick cable connector capture short segment
10/03/2012CN202467733U Double-acting oscillator for stratification test of water injection well
10/03/2012CN102704883A Special fishing device for downhole motor rotor of kilometer-level drilling machine
10/03/2012CN101691834B Inner tube-free drillable-retrievable grading cementing well completion technology
09/2012
09/26/2012EP2501893A2 Tubular retrieval
09/26/2012EP2501892A1 Assembly and method for wide catch overshot
09/26/2012CN202451099U Drilling tool salvaging device
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