| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
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| 06/01/2011 | CN201851008U Down-the-hole reaming drill |
| 06/01/2011 | CN201851007U Screw rotor |
| 06/01/2011 | CN1791731B Systems and methods using a continuously variable transmission to control one or more system components |
| 05/26/2011 | WO2011062925A2 Down-the-hole drill hammer having a reverse exhaust system and segmented chuck assembly |
| 05/26/2011 | US20110120776 Hydrodynamic bearing assemblies, and hydrodynamic bearing apparatuses and motor assemblies using same |
| 05/26/2011 | US20110120725 Wellbore instruments using magnetic motion converters |
| 05/26/2011 | CA2777356A1 Down-the-hole drill hammer having a reverse exhaust system and segmented chuck assembly |
| 05/24/2011 | US7946361 Flow operated orienter and method of directional drilling using the flow operated orienter |
| 05/24/2011 | US7946360 Downhole drilling of a lateral hole |
| 05/24/2011 | US7946358 Sequence valve and a downhole tractor |
| 05/19/2011 | WO2011059362A1 Turbodrill turbine |
| 05/19/2011 | WO2011058307A2 Downhole tractor |
| 05/19/2011 | CA2780236A1 Downhole tractor |
| 05/18/2011 | CN201835742U Mining propelling mechanism of electric-pneumatic in-the-hole drill |
| 05/18/2011 | CN102066793A Drive shaft assembly for a downhole motor |
| 05/18/2011 | CN102066686A Methods and apparatus for drilling directional wells by percussion method |
| 05/11/2011 | CN201826769U Connecting structure of transmission shaft of screw rod drilling tool and inner sleeve of lower radial sliding bearing |
| 05/11/2011 | CN201826768U Connecting structure for upper-end part of driving shaft of spiral drilling tool |
| 05/11/2011 | CN102052056A Hydraulic jet type impactor |
| 05/11/2011 | CN102052055A Dual-power multifunctional rotary drilling rig |
| 05/11/2011 | CN102052054A Hydraulic system of dual-power multifunctional rotary drilling rig |
| 05/11/2011 | CN102052053A Cooling system of dual-power multifunctional rotary drilling rig |
| 05/10/2011 | US7938200 Apparatus and method for a hydraulic diaphragm downhole mud motor |
| 05/05/2011 | WO2011051397A1 A device and a system and a method of moving in a tubular channel |
| 05/05/2011 | WO2011051321A1 Downhole apparatus |
| 05/05/2011 | US20110100715 Center discharge gas turbodrill |
| 05/05/2011 | US20110100640 Drive mechanism |
| 05/04/2011 | CN201818236U Console for hydraulic underground drill rig |
| 05/04/2011 | CN201818235U Reverse rotary screw drilling tool |
| 05/04/2011 | CN201817809U DTH hammer and all casing drill combined machine |
| 05/03/2011 | US7934563 Inverted drainholes and the method for producing from inverted drainholes |
| 04/27/2011 | CN201813223U Motor stator of filling type screw drilling tool with double-layer shell |
| 04/21/2011 | WO2011046444A1 Rock drilling machine |
| 04/21/2011 | US20110088953 Percussion assisted rotary earth bit and method of operating the same |
| 04/21/2011 | US20110088952 Drill Motor Enhancement |
| 04/21/2011 | US20110088951 Dual bha drilling system |
| 04/21/2011 | DE102005055032B4 Rammbohrgerät mit pneumatischer Umsteuerung Ram boring machine with pneumatic reversing |
| 04/20/2011 | CN201802308U Hydraulic power drill for well workover |
| 04/20/2011 | CN102027184A Stator for use in helicoidal motor |
| 04/20/2011 | CN102022860A Process method and equipment for constructing ground source heat pump well |
| 04/14/2011 | WO2011016005A3 Bit assembly for a down-the-hole hammer drill |
| 04/14/2011 | US20110083903 Drilling machine power pack which includes a clutch |
| 04/14/2011 | US20110083900 Downhole drilling system |
| 04/13/2011 | EP2309094A2 Bearing for downhole tool |
| 04/13/2011 | EP2307656A2 Reaming tool |
| 04/13/2011 | EP2307655A2 Reaming tool |
| 04/13/2011 | CN102016217A Percussion assisted rotary earth bit and method of operating the same |
| 04/12/2011 | US7921941 Pressurized fluid flow system for a reverse circulation hammer |
| 04/07/2011 | US20110079439 Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| 04/06/2011 | EP2304157A1 Downhole motor |
| 04/06/2011 | EP1545839B1 Sonic drill |
| 04/06/2011 | CN201786252U Rotation-revolution combined down-hole hammer |
| 04/06/2011 | CN201786251U A combined down-hole hammer |
| 04/06/2011 | CN201786250U 组合式潜孔锤 Combined DTH |
| 04/06/2011 | CN201786249U Piston tail-pipe type and single-cylinder down-hole impactor without valve |
| 04/06/2011 | CN201786248U Piston guide sleeve type no-valve single-cylinder type efficient down-hole hammer |
| 04/06/2011 | CN201786247U Auxiliary hammer mechanism of impact hammer for releasing energy after energy storage and energy-storing type impact hammer |
| 04/06/2011 | CN102003145A Hole driven type horizontal directional drilling reverse circulation hole dilating drill |
| 04/06/2011 | CN102003139A Single body large-diameter pneumatic down-the-hole hammer |
| 04/05/2011 | US7918290 Systems and methods for protecting drill blades in high speed turbine drills |
| 04/02/2011 | CA2715731A1 Electric motors and related systems for deployment in a downhole well environment |
| 03/31/2011 | WO2010151743A3 Sealing system and bi-directional thrust bearing arrangement for a downhole motor |
| 03/31/2011 | US20110073374 Flow Pulsing Device for a Drilling Motor |
| 03/31/2011 | US20110073373 Arrangement & method comprising a flushing head for a rock drilling machine, and rock drilling machine comprising the arrangement |
| 03/30/2011 | CN201778649U Anti-falling screw drill |
| 03/30/2011 | CN101994483A Tower type large-diameter deep well planet primary-secondary drill |
| 03/30/2011 | CN101994482A Screw drill stator |
| 03/24/2011 | WO2010111395A3 Hydraulic control system for drilling systems |
| 03/23/2011 | CN201771423U Novel pneumatic propeller for down hole drill |
| 03/22/2011 | CA2532756C Multiple elastomer layer progressing cavity stators |
| 03/17/2011 | WO2011030095A2 Valves, bottom hole assemblies, and methods of selectively actuating a motor |
| 03/17/2011 | US20110061936 Methods and apparatus for drilling directional wells by percussion method |
| 03/17/2011 | DE102009038385A1 Rammbohrvorrichtung mit einem pneumatischen Antrieb und einer hydraulischen Umsteuerung der Bewegungsrichtung Rammbohrvorrichtung with a pneumatic actuator and a hydraulic reversing the direction of movement |
| 03/16/2011 | CN101418670B High wind pressure pneumatic double-gear turning machine |
| 03/10/2011 | US20110056695 Valves, bottom hole assemblies, and method of selectively actuating a motor |
| 03/09/2011 | EP1735520B1 Improvements in or relating to rock drilling equipment |
| 03/09/2011 | CN201756912U Double-power multi-functional rotary drilling rig with electric driving source |
| 03/08/2011 | CA2458124C A power transmission mechanism, a fluid-driven impactor and its use |
| 03/03/2011 | WO2011023350A1 Drilling ram device having a pneumatic drive and a hydraulic reversal of the movement direction |
| 03/03/2011 | WO2011023341A1 Ram boring device |
| 03/03/2011 | DE102009038383A1 Rammbohrvorrichtung Rammbohrvorrichtung |
| 03/02/2011 | EP2290190A1 Method and apparatus for controlled bidirectional movement of an oilfield tool in a wellbore environment |
| 03/01/2011 | US7896628 Downhole motor seal and method |
| 02/24/2011 | WO2011022580A2 Zero backlash downhole setting tool and method |
| 02/24/2011 | WO2011022574A2 Zero backlash downhole setting tool and method |
| 02/17/2011 | US20110036636 Down-the-hole drill drive coupling |
| 02/17/2011 | US20110036631 Method and apparatus for controlling downhole rotational rate of a drilling tool |
| 02/16/2011 | EP2283200A2 Kinetic energy harvesting in a drill string |
| 02/16/2011 | CN201747263U Nonmagnetic screw drilling tool |
| 02/15/2011 | CA2372355C Method and apparatus to vibrate a downhole component |
| 02/10/2011 | WO2011016005A2 Bit assembly for a down-the-hole hammer drill |
| 02/10/2011 | US20110031023 Borehole drilling apparatus, systems, and methods |
| 02/10/2011 | US20110031020 Wellbore percussion adapter and tubular connection |
| 02/10/2011 | CA2807341A1 Bit assembly for a down-the-hole hammer drill |
| 02/09/2011 | CN201742182U Motor stator of self-cooling screw drilling tool with dual-layer shells |
| 02/09/2011 | CN201742176U Vacuum double-layer shell screw drilling tool motor stator |
| 02/09/2011 | CN201738809U Three-function backflow type hydraulic rotary-percussion device of petroleum drilling |
| 02/09/2011 | CN201738808U Hydraulic rock drill of excavator |
| 02/09/2011 | CN201738807U Major diameter downhole hammer |
| 02/09/2011 | CN201738806U Top driving gear speed reducing device of drilling machine |