| Patents for E21B 3 - Rotary drilling (4,061) |
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| 05/04/2011 | CN201818238U Rock burst preventive drilling machine |
| 05/04/2011 | CN201818236U Console for hydraulic underground drill rig |
| 05/04/2011 | CN201818235U Reverse rotary screw drilling tool |
| 05/04/2011 | CN201817808U Concrete vibrating steel dowel long spiral air-cooled guide hole piling drilling machine |
| 05/04/2011 | CN102044129A Electric control alarm device for preventing drilling rod-dropping accident of rotary drilling rig |
| 05/04/2011 | CN102041997A Rotary drilling rig and depth sounding system |
| 05/04/2011 | CN102041965A Coal mine underground over-broken abnormal zone drilling method |
| 05/04/2011 | CN101638891B Construction method of all casing precessing isolation pile |
| 04/27/2011 | CN201810207U Rotary excavation drilling machine and rotary excavation drilling tool thereof |
| 04/27/2011 | CN201810200U Hydraulic independent driven turntable device for petroleum drilling machine |
| 04/27/2011 | CN201810199U Rotary drilling rig for screw rod drive drill rod |
| 04/27/2011 | CN102037207A Grip head for an earth boring unit |
| 04/27/2011 | CN102037206A Top drive apparatus |
| 04/27/2011 | CN102031929A PLC (Programmable Logic Controller) controlled variable-frequency piling machine |
| 04/27/2011 | CN102031784A Slope protection pile pouring and cable bolting construction method for deep foundation pit |
| 04/26/2011 | US7931077 Top drive drilling apparatus |
| 04/26/2011 | CA2697694C Spring preloaded bearing assembly and well drilling equipment comprising same |
| 04/26/2011 | CA2697620C Breech lock stripper rubber pot mounting structure and well drilling equipment comprising same |
| 04/26/2011 | CA2697039C Spring load seal assembly and well drilling equipment comprising same |
| 04/21/2011 | US20110091285 Apparatus for placing foundation devices, and/or pipes, and/or augers into the ground, as an attachment for the boom of a construction vehicle |
| 04/20/2011 | CN201802323U Drilling rod with hemispherical front end for rotary drilling rig |
| 04/20/2011 | CN201802318U Lifting and pressurizing device for screw-threaded pile machine |
| 04/20/2011 | CN201802307U Rotary drilling rig and power head transmission device thereof |
| 04/20/2011 | CN201802306U Drilling machine |
| 04/20/2011 | CN201802305U Rotary drilling rig major hoist lifting full-automatic bottom protection and main hoist wire rope pre-tightening device |
| 04/20/2011 | CN102022083A Rotary guide well drilling tool |
| 04/20/2011 | CN102022077A Drilling device for underground embedded pipe orifice well of soil source heat pump system |
| 04/20/2011 | CN102022076A Drilling method of rotary drilling machine in hard rock and special-purpose sediment pipe core cone bit |
| 04/19/2011 | US7926594 Bearing assembly inner barrel and well drilling equipment comprising same |
| 04/19/2011 | CA2634533C Top drive |
| 04/13/2011 | CN201794512U Pulley device for power swivel of water well drilling rig |
| 04/13/2011 | CN201794511U Front limiting structure for slender rod and testing device comprising same |
| 04/13/2011 | CN102016217A Percussion assisted rotary earth bit and method of operating the same |
| 04/13/2011 | CN102011546A Large-diameter engineering well holing construction method in super-thick pebble formation |
| 04/12/2011 | US7921939 Method for using a top drive with an air lift thread compensator and a hollow cylinder rod providing minimum flexing of conduit |
| 04/06/2011 | CN201786246U Independent driving rotary table apparatus for petroleum drilling machine |
| 04/06/2011 | CN201786245U Turntable and matched supporting pneumatic chuck thereof |
| 04/06/2011 | CN201786244U Rotary drilling rig |
| 04/06/2011 | CN201786243U Drill for underground |
| 04/06/2011 | CN201786242U Hydraulic spiral drilling machine |
| 04/06/2011 | CN201786241U Top drive device directly driven by motor |
| 04/06/2011 | CN102003142A Screw anchor drilling machine |
| 04/06/2011 | CN102003138A Construction method for carrying out high-precision vertical drilling on concrete and drilling device thereof |
| 04/06/2011 | CN102003137A Drilling equipment and method |
| 04/06/2011 | CN102002941A Large-aperture long screw rig, reinforcement cage concreting device and fabricating method of large-aperture deep pile |
| 04/06/2011 | CN102002940A Drilling apparatus and method for working the ground |
| 04/06/2011 | CN101603309B Occlusive pile of long spiral stirring water-stop curtain and construction process thereof |
| 04/05/2011 | US7918291 Spring preloaded bearing assembly and well drilling equipment comprising same |
| 04/05/2011 | US7918273 Top drive casing system |
| 03/31/2011 | US20110073375 Modular top drive lubrication system and methods |
| 03/31/2011 | US20110073342 Device for driving instruments and tools and the use thereof |
| 03/30/2011 | CN201778903U Automatic idle speed control system of rotary drilling rig |
| 03/30/2011 | CN201778653U Swinging mechanism of hydraulic drilling rig |
| 03/30/2011 | CN201778652U Low-amplitude and high-frequency torsional pulse generator |
| 03/30/2011 | CN201778651U Motor-driven drilling top driving force faucet device |
| 03/30/2011 | CN201778650U Equal-contour-line high-yield oblique screw drilling jig |
| 03/30/2011 | CN201778649U Anti-falling screw drill |
| 03/30/2011 | CN101994516A Control system for anchor rod machine and anchor rod machine with same |
| 03/30/2011 | CN101994482A Screw drill stator |
| 03/24/2011 | WO2011035280A2 Systems and methods for improving drilling efficiency |
| 03/24/2011 | CA2774551A1 Systems and methods for improving drilling efficiency |
| 03/23/2011 | CN201771524U Hydraulic airborne water air drill anchor |
| 03/23/2011 | CN201771426U Self-propelled remote control rotary drilling rig |
| 03/23/2011 | CN201771422U Coal mine rock hydraulic drill |
| 03/23/2011 | CN201771421U Frame pillar type hydraulic drilling machine |
| 03/23/2011 | CN201771420U Lifting mechanism of rotary drilling rig |
| 03/23/2011 | CN201771419U Pile driver |
| 03/23/2011 | CN201770983U Multifunctional piling machine |
| 03/23/2011 | CN1683118B Rechargeable battery-operated hand machine tool |
| 03/23/2011 | CN101990592A Pnuematic drifter with replaceable foot pieces |
| 03/22/2011 | CA2564357C Apparatus and method for modified horizontal directional drilling assembly |
| 03/16/2011 | EP2294276A1 Pneumatic drifter with replaceable foot pieces |
| 03/16/2011 | CN201763887U Rotary drilling rig and counterweight device thereof |
| 03/16/2011 | CN201763264U Rotary digging drill and drill rod |
| 03/16/2011 | CN201763259U Rotary drilling rig and cathead thereof |
| 03/16/2011 | CN201763238U Mine driller |
| 03/16/2011 | CN201763237U Power head driving sleeve for rotary digging drill |
| 03/16/2011 | CN201763236U Drilling machine for mine |
| 03/16/2011 | CN201763235U Reciprocation drilling machine for mine |
| 03/16/2011 | CN201763234U Low-energy consumption power head driving sleeve for rotary digging drill |
| 03/16/2011 | CN201763233U Composite type power head driving sleeve for rotary digging drill |
| 03/16/2011 | CN201763232U Cast-in-site tubular pile rotary drilling rig |
| 03/15/2011 | US7905299 Articulation assembly for moving a drill mast |
| 03/10/2011 | WO2010129944A3 Method and system for integrating sensors on an autonomous mining drilling rig |
| 03/09/2011 | CN201757144U Inertia brake support for split rotary disk driving device |
| 03/09/2011 | CN201756911U Floating type power head core axle mechanism of a horizontal directional driller |
| 03/09/2011 | CN201756910U Multifunctional protection device for power head of rotary drilling rig |
| 03/09/2011 | CN101984191A High pressure jet grouting pile driving machine |
| 03/03/2011 | WO2011023028A1 High and low dual-speed pressurizing system for rotary drilling rig |
| 03/03/2011 | WO2010137798A3 Method and apparatus for drilling large-diameter hole in ground |
| 03/03/2011 | US20110048807 Excavator |
| 03/03/2011 | US20110048753 Motor-driven machine tool |
| 03/02/2011 | CN201753583U Hollow chuck-type power head |
| 03/01/2011 | CA2570225C Drilling rig and vibration dampening support frame |
| 02/24/2011 | US20110042142 Spindrill |
| 02/22/2011 | US7891426 Heat exchanger system and method of use thereof and well drilling equipment comprising same |
| 02/22/2011 | CA2517993C Method and apparatus for drilling with casing |
| 02/17/2011 | US20110036634 Rock drilling device |
| 02/16/2011 | CN201747280U Impact cylinder drilling tool and rotary drilling rig |
| 02/16/2011 | CN201747266U Novel rotary table transmission case device |