| Patents for E21B 3 - Rotary drilling (4,061) |
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| 02/16/2011 | CN201747265U Power head for underground drill rig |
| 02/16/2011 | CN201747264U Power head for underground drill rig |
| 02/16/2011 | CN201747263U Nonmagnetic screw drilling tool |
| 02/16/2011 | CN201747262U Power head for underground drill rig |
| 02/16/2011 | CN201747261U Long twist drill for construction of anti-floating anchor rod |
| 02/16/2011 | CN201747260U Double-drill pipe well drill rig |
| 02/16/2011 | CN201746831U Turbopump-lifting downhole and rotary drilling machine |
| 02/16/2011 | CN101975024A Rotary drilling rig and turntable thereof |
| 02/16/2011 | CN101975023A Method and device for drilling deep and long gas drainage hole in soft coal seam along layers |
| 02/16/2011 | CN101974905A Pile-embedding method for hollow pile and auger drill for implementing same |
| 02/10/2011 | US20110030982 Hydraulic drilling machine for working in a small space |
| 02/09/2011 | EP1756390B1 System for directional boring including a drilling head with overrunning clutch and method of boring |
| 02/09/2011 | CN201739264U Oil line structure for power head motor on drilling machine |
| 02/09/2011 | CN201738805U Rotary motive power head of cutting drilling machine |
| 02/09/2011 | CN201738804U Rotary power head of drilling rig adopting roller curve section oscillating tooth speed change gear |
| 02/09/2011 | CN201738803U Drilling machine rotary power head adopting high-level elliptic surface movable teeth speed changing device |
| 02/09/2011 | CN201738802U Deceleration rig rotary power head with high-order elliptic profile end surfaces and movable teeth |
| 02/09/2011 | CN101967954A Rotary table device of rotary drilling machine |
| 02/09/2011 | CN101967953A Large-torque rig equipment for coal mine underground tunnel |
| 02/09/2011 | CN101481992B Shaft pore-forming equipment and technique |
| 02/08/2011 | US7882901 System and method for breaking chips formed by a drilling operation |
| 02/02/2011 | CN201730606U Cap-drive remote control high-pressure ball valve |
| 02/02/2011 | CN201730544U Hydraulic rotary table of oil drilling machine |
| 02/02/2011 | CN201730543U Turnplate mater bushing device for deep well in oil drilling machine |
| 02/02/2011 | CN201730542U Underlying fixed key slot slide power panel used on piling and pore-forming drilling machine |
| 02/02/2011 | CN201730541U Hydraulic auger drill |
| 02/02/2011 | CN201730540U Rotary drilling machine and cylindrical drill thereof |
| 02/02/2011 | CN201730539U Anchor rod machine |
| 02/02/2011 | CN201730538U Low-gravity-center three-shaft spiral drilling machine |
| 02/02/2011 | CN101629422B Construction method for supporting foundation ditch of reinforced cement earth wall |
| 01/26/2011 | EP2278116A2 Flush mounted spider |
| 01/26/2011 | CN101956524A Rotary drilling rig and power head gearing thereof |
| 01/26/2011 | CN101956523A Multifunctional engineering driller of rock tunnel |
| 01/26/2011 | CN101240692B Driving structure for double drilling-rod |
| 01/25/2011 | US7874378 Vibratory and impact connector for a power tool |
| 01/25/2011 | US7874353 Bearing assembly retaining apparatus and well drilling equipment comprising same |
| 01/19/2011 | EP2274496A1 A device for registration of rotational parameters during assembly of a pipe string |
| 01/19/2011 | CN101949263A Self-propelled remote control rotary drilling machine |
| 01/19/2011 | CN101949259A Multifunctional shale electric drill |
| 01/19/2011 | CN101949258A New gear speed reducer for top drive of petroleum drilling machine |
| 01/18/2011 | CA2634534C Top drive |
| 01/12/2011 | CN201705210U Anhydrous labor exploration drill |
| 01/12/2011 | CN201705204U Stepless angle regulation turntable type hydraulic crawler drilling machine |
| 01/12/2011 | CN201705199U Sealing device of power head box of rotary drilling rig and rotary drilling rig |
| 01/12/2011 | CN101942980A Top-driving manual-automatic integrated internal blowout preventer |
| 01/12/2011 | CN101942970A Hoisting device of power tap |
| 01/12/2011 | CN101942830A Combined concrete soil pile with core pile and construction method as well as construction device thereof |
| 01/11/2011 | US7866382 Spring load seal assembly and well drilling equipment comprising same |
| 01/06/2011 | US20110000696 Power tool |
| 01/05/2011 | CN201695955U Counter weight and rotary drilling rig provided with same |
| 01/05/2011 | CN201695952U Rotary drilling rig and flat head device thereof |
| 01/05/2011 | CN201695949U Casing driver and rotary drilling rig |
| 01/05/2011 | CN201695946U Rotary drilling machine |
| 01/05/2011 | CN201695945U 旋挖钻机 Rotary Drilling Rig |
| 01/05/2011 | CN201695943U Dual-purpose power head of pile driver |
| 01/05/2011 | CN201695942U High-pressure double-spray rotary head |
| 01/05/2011 | CN201695941U Hand-held optical cable mark-burying drill |
| 01/05/2011 | CN201695940U Side motor arrangement type pneumatic jumbolter |
| 01/05/2011 | CN201695392U Multifunctional rotatable multi-shaft meshed pile drilling machine |
| 01/05/2011 | CN101936132A Reciprocating drill for mine |
| 01/05/2011 | CN101936131A Rotary drilling rig |
| 01/05/2011 | CN101936130A Rotary power head of cutting drill |
| 01/05/2011 | CN101936129A Driller rotation power head adopting high-order elliptic molded surface active teeth speed changing device |
| 01/05/2011 | CN101936128A Drilling machine for mines |
| 01/05/2011 | CN101936127A Mine drilling machine |
| 12/29/2010 | CN201687410U Intelligent multi-locking-point rotary drilling rig drill stem |
| 12/29/2010 | CN201687399U Drilling machine capable of positioning fast and accurately |
| 12/29/2010 | CN201687388U Limiting device for turntable structure of rotary digging and drilling machine |
| 12/29/2010 | CN201687387U Rotary carrying device in top-driving well drilling device |
| 12/29/2010 | CN201687386U Screw drilling tool |
| 12/29/2010 | CN101929308A Lower fixed key slot sliding power plate for piling pore-forming drill |
| 12/29/2010 | CN101929307A Tackle arrangement for power swivel of well drilling machine |
| 12/22/2010 | EP2262971A1 Breech lock stripper rubber pot mounting structure and well drilling equipment comprising same |
| 12/22/2010 | CN201679441U Drilling water faucet |
| 12/22/2010 | CN201679440U Guide rail for drilling equipment |
| 12/22/2010 | CN1637229B Boring device and method for introducing a boring element into the ground |
| 12/16/2010 | WO2009081186A3 Top drive apparatus |
| 12/15/2010 | CN201671535U Vertical-spindle hydraulic driven core drill |
| 12/15/2010 | CN201671534U Screw drilling tool |
| 12/15/2010 | CN201671533U Light tunnel drilling machine |
| 12/15/2010 | CN101915065A Hemispherical drill stem for rotary drilling rig |
| 12/15/2010 | CN101915060A Light-duty rotary drilling rig |
| 12/15/2010 | CN101915058A Improved power head drive bushing for rotary drilling rig |
| 12/15/2010 | CN101915057A Power head driving sleeve of rotary drilling rig |
| 12/15/2010 | CN101915056A Power head drive sleeve of improved rotary drilling rig |
| 12/15/2010 | CN101914915A Construction method for anti-floating anchor rod and special long auger |
| 12/15/2010 | CN101913540A Rotary drilling rig and wire rope guiding device thereof |
| 12/09/2010 | WO2009132831A3 Grip head for an earth boring unit |
| 12/09/2010 | US20100307829 Cutting elements including cutting tables with shaped faces configured to provide continuous effective positive back rake angles, drill bits so equipped and methods of drilling |
| 12/08/2010 | CN201666444U Back gear automatic lubricating device of rotary drilling rig |
| 12/08/2010 | CN201666116U Transmission shaft bracket of turntable transmission box |
| 12/08/2010 | CN201666115U One-way high-peed earth throwing electrohydraulic control device of rotary drilling rig |
| 12/08/2010 | CN201666114U Rotation device |
| 12/08/2010 | CN201666113U Hydraulic oil forced filtration-type rotary drilling rig |
| 12/08/2010 | CN1995689B Pile forming method of pile forming mechanism with gyro bit |
| 12/08/2010 | CN101906934A Power head for tunnel drilling machine |
| 12/08/2010 | CN101906933A Power head for underground drill rig |
| 12/08/2010 | CN101906932A Non-magnetic screw drill tool |
| 12/08/2010 | CN101906931A High-order elliptic surface connection and drilling machine propelling mechanism using same |
| 12/07/2010 | US7845428 Rotating tool |