| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 05/15/2013 | CN202937214U Fisher |
| 05/15/2013 | CN202937213U Female buckle fishing machine |
| 05/10/2013 | WO2013028402A3 Variable frequency fluid oscillators for use with a subterranean well |
| 05/08/2013 | CN202926272U Non-core rod fishing equipment for rotary excavating drill rod |
| 05/08/2013 | CN202926232U Adjustable salvage bent connection head |
| 05/08/2013 | CN202926211U Mining hydraulic working machine |
| 05/08/2013 | CN103089229A Acid fracturing pipe column ball seat capable of fishing and being used repeatedly |
| 05/02/2013 | WO2013059873A1 A downhole tool |
| 05/02/2013 | WO2013036805A3 Pressure lock for jars |
| 05/02/2013 | CA2853510A1 A downhole tool |
| 05/01/2013 | CN202914027U Salvage type drilling-free plug hydraulic grading cementing device and special spear thereof |
| 05/01/2013 | CN202914011U Drill grinding locking fishing tool for oil gas well |
| 05/01/2013 | CN202914010U Retreating type fishing hook |
| 05/01/2013 | CN202914009U Salvage device for achieving state switching underground |
| 05/01/2013 | CN202914008U Shearing type drifting gauge |
| 05/01/2013 | CN103080462A Fishing tool and method |
| 04/25/2013 | WO2013028310A3 Subterranean vibrator with lateral vibration feature |
| 04/24/2013 | CN202900148U Blanking plug of well kill pipe column |
| 04/24/2013 | CN202900122U Autorotation type case milling fishing device |
| 04/24/2013 | CN202900121U Double-acting hydraulic driver |
| 04/24/2013 | CN202900120U Double-wall annular salvage sleeving |
| 04/24/2013 | CN202900119U Ground extraction gas drilled well casing dredging device |
| 04/24/2013 | CN202900118U Anti-blockage drifting gauge |
| 04/23/2013 | US8424939 Tri-cam axial extension to provide gripping tool with improved operational range and capacity |
| 04/23/2013 | US8424598 Magnetically controlled delivery of subterranean fluid additives for use in subterranean applications |
| 04/18/2013 | WO2013055330A1 Independent dual actuated subsurface safety valve |
| 04/18/2013 | US20130092378 Selectively fired high pressure high temperature back-off tool |
| 04/17/2013 | CN202882839U Throwing-type washable underground pressure bearing blocking device |
| 04/17/2013 | CN202882825U Low water resistance drifting size gauge |
| 04/17/2013 | CN103046886A Oil field underground catcher |
| 04/17/2013 | CN103046885A Hitting device for loosening coupling of oil extraction pipe |
| 04/17/2013 | CN103046877A Anti-dropping mechanism of quick joint |
| 04/16/2013 | US8418758 Jarring tool with micro adjustment |
| 04/10/2013 | EP2576963A2 Selective control of charging, firing, amount of force, and/or direction of fore of one or more downhole jars |
| 04/10/2013 | CN202866724U Sliding block fishing spear |
| 04/10/2013 | CN202866723U Slope type special-shaped fish top guider |
| 04/10/2013 | CN202866722U Hook-moving type special-shaped fish jacking miter guide |
| 04/10/2013 | CN202866721U Compound combination washover catch sleeve |
| 04/10/2013 | CN202866720U Drilling bucket latch jack for rotary drilling machine |
| 04/10/2013 | CN202866719U Fishing tool |
| 04/10/2013 | CN202866718U Hollow outer hook special for salvaging cables buried by sand in serious sand flow electric pump wells |
| 04/10/2013 | CN202866717U Vibration type delivering and fishing device |
| 04/10/2013 | CN202866716U Movable drill clinometer probe catcher |
| 04/03/2013 | CN202850919U Catch-type broken rod fishing machine tool |
| 04/03/2013 | CN202850918U Polish rod salvaging device |
| 04/03/2013 | CN202850917U Pumping rod fisher for lining oil pipe |
| 04/03/2013 | CN202850916U Centralizing type broken rod fishing machine |
| 04/03/2013 | CN202850915U Drift diameter gauge of one-time full well drilling tool |
| 04/03/2013 | CN103015937A Special fishing tool for screw drill |
| 04/03/2013 | CN103015936A Scattered object fracturing bomb device |
| 04/03/2013 | CN103015932A Drilling system with function of coring while drilling |
| 04/03/2013 | CN103015931A Coring system with function of coring while drilling |
| 04/03/2013 | CN103015929A Casting-fishing tool with strength-sensing position |
| 04/03/2013 | CN103015898A Mining hydraulic power operation machine |
| 04/03/2013 | CN101899959B Fishing oil tube overflow controller |
| 03/28/2013 | WO2013043539A2 Well tractor with active traction control |
| 03/28/2013 | WO2013040641A1 Borehole surveying tool deployment |
| 03/28/2013 | CA2849001A1 Borehole surveying tool deployment |
| 03/28/2013 | CA2847704A1 Well tractor with active traction control |
| 03/27/2013 | CN202832425U Screen pipe and oil and gas well opening ball-catching device using the same |
| 03/27/2013 | CN202832393U Drifting scraping integration tool |
| 03/27/2013 | CN202832379U Double sliding sleeves with salvageable ball seat and capable of being opened and closed selectively |
| 03/27/2013 | CN202832337U Side-opening sucker rod overshot |
| 03/27/2013 | CN202832336U Fisher with releasable slip |
| 03/27/2013 | CN202832335U Gap-free sedimentation type oil-and-gas well mouth ball-catching device |
| 03/27/2013 | CN202832334U Straight-barrel-type oil-gas well head ball catching device |
| 03/27/2013 | CN202832324U Electric running and pulling tool |
| 03/27/2013 | CN202832305U Reversing jam releaser for oil pumping rod |
| 03/27/2013 | CN202832268U Self-dissolution millable centralizer |
| 03/27/2013 | CN202832260U Safety joint for drilling |
| 03/27/2013 | CN102996091A Control method for automatic anti-jamming hydraulic system of rock driller |
| 03/21/2013 | US20130068479 Well Tractor With Active Traction Control |
| 03/20/2013 | CN202810748U Long-pole tapered mill type reversing fishing spear |
| 03/20/2013 | CN202810747U Skirt type generating cone |
| 03/20/2013 | CN202810746U Spring-clip fishing tool special for coring tool |
| 03/20/2013 | CN202810745U Catch sleeve special for spring-type coring tool |
| 03/20/2013 | CN202810744U Short fish top salving barrel |
| 03/20/2013 | CN202810738U Downhole core drilling machine |
| 03/20/2013 | CN102979473A Layered pulse pressure-charging plug removal device and method for oil filed water injection well |
| 03/19/2013 | US8397815 Method of using wired drillpipe for oilfield fishing operations |
| 03/14/2013 | WO2013036805A2 Pressure lock for jars |
| 03/14/2013 | US20130062052 Pressure lock for jars |
| 03/13/2013 | CN202788718U Split fishing drum |
| 03/13/2013 | CN202788717U Self-locking split fishing drum |
| 03/13/2013 | CN202788716U Downhole testing device casing pipe salvage tool |
| 03/13/2013 | CN202788715U Hydraulic down-hole fishing tool with devil's hand |
| 03/13/2013 | CN202788714U Mud salvage tube |
| 03/13/2013 | CN202788713U Rotating sand cut downhole tool |
| 03/13/2013 | CN202788712U Tool for fishing well wall coring cylinder |
| 03/13/2013 | CN202788711U Multistage packer fishing tool for water injection well |
| 03/13/2013 | CN202788710U Integral drifting tool |
| 03/13/2013 | CN202788693U Small junk ground capture device for circulation well flushing |
| 03/13/2013 | CN102966326A Profiled salvage drill bit |
| 03/13/2013 | CN102966325A Novel fishing tool |
| 03/13/2013 | CN102966324A Double-wall annular salvaging sleeve pipe and method for salvaging falling objects in hole |
| 03/13/2013 | CN102966322A Method for dropping and fishing tubing plug |
| 03/13/2013 | CN102151375B Towing rescue protection device |
| 03/12/2013 | US8393386 Subsurface safety valve and method of actuation |
| 03/08/2013 | CA2788960A1 Pulling clamp for continuous rod or coiled tubing strings |
| 03/07/2013 | US20130056202 Optical Casing Collar Locator Systems and Methods |