| Patents for E21B 3 - Rotary drilling (4,061) |
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| 04/06/2005 | CN2690552Y Exciting well drilling tool in complicated ground area |
| 03/31/2005 | WO2005028808A1 Automatic false rotary |
| 03/31/2005 | US20050067168 Method and apparatus for controlling the ascent and descent of pipe in a well bore |
| 03/30/2005 | EP1518999A2 Method and apparatus for driving a boring element into the ground |
| 03/30/2005 | CN1601046A Fast well rig with no circular liquid |
| 03/30/2005 | CN1601045A Drilling apparatus and method for introducing a drilling element into the soil |
| 03/24/2005 | US20050061550 Drilling apparatus and method for introducing a drilling element into the soil |
| 03/23/2005 | CN2687301Y Integral tower-building type long-spiral drilling machine |
| 03/17/2005 | WO2004079147A9 Method and apparatus for drilling with casing |
| 03/17/2005 | US20050056420 Apparatus and method for visually detecting wear to insert bowls, bushings, and spiders |
| 03/16/2005 | CN2685625Y Large power closed system |
| 03/16/2005 | CN1193160C Drilling apparatus for drilling well in stratum |
| 03/10/2005 | WO2005021927A1 A drilling device with a telescopic arm |
| 03/10/2005 | WO2004097160A3 System and method using a continuously variable transmission to control one or more system components |
| 03/10/2005 | US20050051364 Feed table pivot pin constraining device |
| 03/09/2005 | EP1512831A1 Feed table pivot pin constraining device |
| 03/09/2005 | CN2683848Y Rotary disc reversing prevention braking mechanism for well drilling |
| 03/09/2005 | CN2683819Y Pit drilling apparatus |
| 03/09/2005 | CN2683818Y Super-light type drilling machine for mining |
| 03/09/2005 | CN2683817Y Hydraulic bending moment type rock electric drill |
| 03/02/2005 | CN2682185Y Sliding type drill rod clamp for top driving drilling device |
| 03/02/2005 | CN1587631A Multiple shaft drilling machine and its construction method |
| 03/02/2005 | CN1587630A Rope salvaging type filing discharge stepless drilling and forming hole method and machine tool |
| 02/23/2005 | CN2680843Y Mechanical casing drive head for casing drilling |
| 02/23/2005 | CN1584278A Multi-drilling bit high-speed rotary punching apparatus |
| 02/16/2005 | CN2679337Y Crawler monotube jetitng hydraulic jumbolter |
| 02/09/2005 | CN2677579Y Low-noise wall bit |
| 02/09/2005 | CN2677578Y Square bushing device |
| 02/02/2005 | CN2675840Y Vertical shaft swinging type self-unloading fastener engineering drilling machine |
| 01/27/2005 | WO2004079155A3 Methods and apparatus for handling and drilling with tubulars or casing |
| 01/26/2005 | CN2674063Y Gantry type engineering drilling machine |
| 01/26/2005 | CN2674062Y Rotating power mechanism for rotary drill cart |
| 01/26/2005 | CN2674061Y Loose-proof device for power head central tube |
| 01/26/2005 | CN2674060Y Pipe-line arrangement for out-hanging type power head |
| 01/26/2005 | CN2674059Y Large torque and multi-functional power head |
| 01/19/2005 | CN2672372Y Rotary device |
| 01/12/2005 | CN2670576Y Single cylinder hydraulic horizontal drilling machine |
| 01/12/2005 | CN2670575Y Double-cylinder hydraulic horizontal drilling machines |
| 01/12/2005 | CN2670574Y Rotary well drilling machines |
| 01/12/2005 | CN2670573Y Variable-speed transfer gearbox device for petroleum exploration |
| 01/12/2005 | CN1563661A Hoisting and draughting mechanism in ram machine for screw thread pile |
| 01/12/2005 | CN1563603A Technical method for pouring reinforced concrete pipe pile in large diameter on location and equipment |
| 01/06/2005 | US20050000733 Systems and methods for performing mud pulse telemetry using a continuously variable transmission |
| 01/06/2005 | US20050000691 Methods and apparatus for handling and drilling with tubulars or casing |
| 01/05/2005 | CN2668930Y Drilling machine power driving system |
| 01/05/2005 | CN1561427A Washpipe assembly |
| 12/30/2004 | US20040262044 Systems and methods for directionally drilling a borehole using a continuously variable transmission |
| 12/30/2004 | US20040262043 Systems and methods for the drilling and completion of boreholes using a continuously variable transmission to control one or more system components |
| 12/22/2004 | CN1556302A Low nose well drill |
| 12/22/2004 | CN1556301A Radiation well horizontal radiation pipe full hydraulic construction equipment |
| 12/21/2004 | US6832658 Top drive system |
| 12/16/2004 | US20040251050 Method and apparatus for drilling with casing |
| 12/14/2004 | CA2058784C Earth drilling apparatus |
| 12/02/2004 | WO2004079147A3 Method and apparatus for drilling with casing |
| 12/01/2004 | CN2660086Y High voltage electric driving gear of oil drill |
| 12/01/2004 | CN2660085Y Mine rock electrodrill |
| 11/24/2004 | EP1222356B1 Method and device for moving a tube in a borehole in the ground |
| 11/24/2004 | CN2658368Y Hand petroleum drilling machine |
| 11/18/2004 | US20040226731 Drilling and/or hammering tool |
| 11/17/2004 | CN2656597Y Fast connecting mechanism for guide rail |
| 11/11/2004 | WO2004097160A2 System and method using a continuously variable transmission to control one or more system components |
| 11/11/2004 | CA2727134A1 Systems and methods using a continuously variable transmission to control one or more system components |
| 11/11/2004 | CA2726969A1 Systems and methods using a continuously variable transmission to control one or more system components |
| 11/10/2004 | EP1475512A1 Pipe running tool |
| 11/09/2004 | US6814167 Boring device and boring method |
| 11/09/2004 | US6814166 Direct push drilling swivel and method for its use |
| 10/27/2004 | CN1540129A Earth auger of making concrete pile |
| 10/20/2004 | CN2649763Y Hydraulic rotary table for oil drilling rig |
| 10/13/2004 | EP1466067A2 Offset elevator for a pipe running tool and a method of using a pipe running tool |
| 10/07/2004 | US20040197175 Power tool with battery pack ejector |
| 10/06/2004 | EP1159508B1 Snubbing unit tong apparatus |
| 10/06/2004 | CN2646214Y Pile extruder |
| 10/05/2004 | CA2307386C Torque boost apparatus and method for top drive drilling systems |
| 09/28/2004 | US6796390 Method and device for moving a tube in a borehole in the ground |
| 09/22/2004 | EP1458949A2 Rotary support table |
| 09/16/2004 | WO2004079155A2 Methods and apparatus for handling and drilling with tubulars or casing |
| 09/16/2004 | WO2004079147A2 Method and apparatus for drilling with casing |
| 09/16/2004 | US20040177971 Washpipe assembly |
| 09/15/2004 | CN2641264Y Hydraulic coal drill with non-oil medium motor |
| 09/15/2004 | CN2641263Y Drilling rod with increased length |
| 09/14/2004 | CA2306714C Apparatus and method for rapid replacement of upper blowout preventers |
| 09/08/2004 | CN2639501Y 钻井机 Drilling Machine |
| 09/08/2004 | CN1526911A Drilling and reaming machine |
| 09/01/2004 | CN2637698Y Power driving devcie for petroleum drilling machine |
| 09/01/2004 | CN2637697Y Petroleum drilling machine rotary table driving device |
| 09/01/2004 | CN2637696Y Ice drilling machine |
| 08/26/2004 | WO2003018951A8 Washpipe assembly |
| 08/25/2004 | CN2635889Y Inner sleeve plug-in type top driving well drilling device |
| 08/24/2004 | US6779543 BOP operating system with quick dump valve |
| 08/19/2004 | US20040159467 Continuous circulation drilling method |
| 08/19/2004 | US20040159465 Drilling method |
| 08/18/2004 | CN2634184Y Rotary drill bit clutch |
| 08/12/2004 | US20040154835 Tong for wellbore operations |
| 08/05/2004 | WO2003054338A3 Offset elevator for a pipe running tool and a method of using a pipe running tool |
| 08/04/2004 | CN2630462Y Complex surface zone detector well portable drilling tool |
| 07/29/2004 | US20040144547 Methods and apparatus for applying torque and rotation to connections |
| 07/28/2004 | CN2628706Y Tilt oscillating self-clamping back tongs for top driving drilling well apparatus |
| 07/20/2004 | US6763901 Air delivery system for a direct push drilling swivel |
| 07/08/2004 | WO2003060280A3 Rotary support table |
| 07/07/2004 | CN2623863Y Coaxial adamant boring machine |