| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
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| 04/03/2013 | CN202850856U Hydraulic down-the-hole drill |
| 04/03/2013 | CN103016044A Comprehensive method of drilling, permeability increasing, repairing and gas-driven displacing of drill hole underground coal mine |
| 04/03/2013 | CN103015967A Method of controlling direction of toolface of bottom hole assembly for slide drilling |
| 04/03/2013 | CN103015898A Mining hydraulic power operation machine |
| 04/03/2013 | CN103015897A Underwater drilling assembly and method for producing a borehole |
| 04/03/2013 | CN103015896A Underwater drilling arrangement and method for making a bore in a bed of a water body |
| 04/03/2013 | CN103015895A Underwater work assembly and method for anchoring the same |
| 04/03/2013 | CN103015894A Friction and resistance reducing tool with axial crawling function |
| 04/03/2013 | CN103015893A Non-excavation horizontal directional drilling machine |
| 04/03/2013 | CN103015892A Variable-diameter stabilizer and variable-diameter stabilizer system |
| 04/03/2013 | CN103015891A Movable roof expansion bolt punching device |
| 04/03/2013 | CN102345442B Electric hole diameter expander |
| 04/03/2013 | CN102168524B Tower-caterpillar integrated core drill machine arranged at the front side of drill tower |
| 04/03/2013 | CN102003142B Screw anchor drilling machine |
| 04/03/2013 | CN101858218B Shaft sinking process for expansion well completion of mine vertical shaft with boring method |
| 04/03/2013 | CN101845952B Movable three-arm top-assisting anchor rod and anchor cable construction drill carriage |
| 04/03/2013 | CN101775982B Microsphere hydraulic sidewall contact device |
| 04/03/2013 | CN101705787B Rotary steerable system and rotary steerable executor for drilling |
| 04/02/2013 | US8408843 System and method for facilitating underground communication cable installation utilizing soil erosion techniques |
| 04/02/2013 | US8408333 Steer systems for coiled tubing drilling and method of use |
| 04/02/2013 | US8408329 Piling and drilling rig with foldable deflection apparatus |
| 04/02/2013 | US8408304 Pump mechanism for cooling of rotary bearings in drilling tools and method of use thereof |
| 04/02/2013 | CA2755628C Helical drilling apparatus, systems, and methods |
| 04/02/2013 | CA2658756C Technique and apparatus for drilling and completing a well in one half trip |
| 04/02/2013 | CA2614466C Steering system |
| 03/28/2013 | WO2013041775A1 Drilling boom, drilling rig and method for using a drilling rig |
| 03/28/2013 | WO2013015967A3 Whipstock assembly and method for low side exit |
| 03/28/2013 | US20130075164 Point The Bit Rotary Steerable System |
| 03/28/2013 | US20130075162 Roller cone bit |
| 03/28/2013 | US20130075102 Mobile offshore drilling unit |
| 03/28/2013 | DE112011102059T5 Spanflächensteuerung für rotatorischen lenkbaren Werkzeugaktuator Clamping surface control for rotary steerable Werkzeugaktuator |
| 03/27/2013 | EP2572072A2 Method for drilling through nuisance hydrocarbon bearing formations |
| 03/27/2013 | CN202833886U Vehicle-mounted workover rig angle transmission case |
| 03/27/2013 | CN202832236U Hydraulic lifting n-shaped stand column rig |
| 03/27/2013 | CN202832209U Sidetracking well slim hole chambering tool |
| 03/27/2013 | CN202832208U Lower bushing pipe grouting device |
| 03/27/2013 | CN202832207U Gas-liquid mixed pressurizing device |
| 03/27/2013 | CN202832206U Bottom hole self-oscillation pulse particles jet drilling speed improving tool |
| 03/27/2013 | CN202832205U Vertical well drilling well straightening device |
| 03/27/2013 | CN202832204U Variable diameter stabilizer |
| 03/27/2013 | CN202832203U Improved oil drilling device |
| 03/27/2013 | CN202832202U Full-hydraulic telescopic arm anchor rod driller |
| 03/27/2013 | CN202832201U Vehicle-mounted workover rig without guy rope |
| 03/27/2013 | CN202832200U Improved well drill |
| 03/27/2013 | CN202832199U Improved motor-driven well drilling device |
| 03/27/2013 | CN202832198U Improved motor-driven multifunctional well drilling device |
| 03/27/2013 | CN202832197U Folding-type double-layer pedal device |
| 03/27/2013 | CN202832196U Pile sinking lead hole construction machinery for deep and thick high compressibility soft soil clamp riprap layer subgrade |
| 03/27/2013 | CN103003516A Method for drilling through nuisance hydrocarbon bearing formations |
| 03/27/2013 | CN103003514A Two-port percussion mole |
| 03/27/2013 | CN102996076A Drilling bit of horizontal directional drilling machine |
| 03/27/2013 | CN102996073A Small module assembled offshore platform drilling machine |
| 03/27/2013 | CN102996072A Multifunctional cutting drilling machine |
| 03/27/2013 | CN102996071A Guide rail seat for train-type translation device |
| 03/27/2013 | CN102996065A Rotary drilling rig with circular tube type extension-type travelling chassis |
| 03/27/2013 | CN102996063A Drilling mechanism for mine rock drilling and tunneling |
| 03/27/2013 | CN102995689A Pond digging tool for telegraph poles |
| 03/27/2013 | CN102322218B Three-hinge point side swing mechanism of drill carriage connecting rod |
| 03/27/2013 | CN102230363B Device and method for drilling and forming hole in coal rock in structural belt |
| 03/27/2013 | CN102146779B Underground locating and angle-fixing drilling and windowing tool for horizontal well |
| 03/27/2013 | CN102080501B Mineral deep hole drilling carriage unit |
| 03/27/2013 | CN101922167B Method for taking water by explosively enlarging spiral filter tube |
| 03/27/2013 | CN101896683B System for drilling a wellbore |
| 03/27/2013 | CN101663463B Method of modifying drilling pattern, rock drilling rig, and software product |
| 03/27/2013 | CN101598016B Depth multi-point correction method for horizontal positioning drill guide instrument |
| 03/27/2013 | CN101059074B Underground drill for controlling underground drilling and the method |
| 03/26/2013 | US8403078 Methods and apparatus for wellbore construction and completion |
| 03/26/2013 | CA2674350C Method and apparatus for retrieving an assembly from a wellbore |
| 03/26/2013 | CA2514534C A downhole tool with an axial drive unit |
| 03/21/2013 | WO2013016282A3 Path tracking for directional drilling as applied to attitude hold and trajectory following |
| 03/21/2013 | WO2012027271A3 Counter rotating drilling system |
| 03/21/2013 | US20130068527 Systems and methods for gravity-independent gripping and drilling |
| 03/21/2013 | US20130068490 Two pipe horizontal directional drilling system |
| 03/21/2013 | DE102011053793A1 Method for dig-less horizontal laying of pipes in ground, involves filling fluid medium in longitudinal direction of pipe, and causing fluidization of surrounding soil due to piecewise migratory increase of diameter of pipe |
| 03/20/2013 | EP2570554A1 Tool for making a diaphragm wall |
| 03/20/2013 | EP2570553A1 Steel wall and construction method for steel wall |
| 03/20/2013 | CN202810686U Anchoring type multilateral well window height adjusting pup joint |
| 03/20/2013 | CN202810676U Water stopping sleeve structure for water detection and drainage in coal mine |
| 03/20/2013 | CN202810658U Novel helical tooth reamer |
| 03/20/2013 | CN202810657U Spiral redressing and expanding tool |
| 03/20/2013 | CN202810656U Double rotational-speed device controlling bit pressure distribution relation of reaming while drilling |
| 03/20/2013 | CN202810655U Casing pipe grouting tool |
| 03/20/2013 | CN202810654U Recyclable type well head balance weight assembly |
| 03/20/2013 | CN202810653U Guide tool for wellhead pressurizing tool |
| 03/20/2013 | CN202810652U Horizontal drill orientation system for deep hole drilling carriage |
| 03/20/2013 | CN202810651U Outburst prevention crawler drilling machine for excavation roadway |
| 03/20/2013 | CN202810650U Crawler-type double-arm full-hydraulic drilling rig |
| 03/20/2013 | CN202810649U Mounting support of fire extinguisher of workover rig |
| 03/20/2013 | CN202810648U Small-size twist drill machine |
| 03/20/2013 | CN202810646U Drilling machine and forcing mechanism thereof |
| 03/20/2013 | CN102985634A Method for producing a horizontally drilled bore hole in the ground and horizontal drilling device |
| 03/20/2013 | CN102979500A A method of controlling a direction of drilling of the drill string used to form an opening in a subsurface formation |
| 03/20/2013 | CN102979499A System and method for operation control of vehicle-mounted drill machine |
| 03/20/2013 | CN102979490A Bubble-column vortex-induced vibration suppression device of stand pipe under marine environment |
| 03/20/2013 | CN102979459A High-density particle-containing fluid control device |
| 03/20/2013 | CN102979458A Rock wall beam oblique surface smooth blasting punching guiding and positioning device |
| 03/20/2013 | CN102979457A High-altitude drill positioning method of building |
| 03/20/2013 | CN102979456A Operating room of horizontal directional driller |
| 03/20/2013 | CN102979455A Horizontal hole drilling machine |
| 03/20/2013 | CN102251744B Annular patio drilling machine |