| Patents for E21B 3 - Rotary drilling (4,061) |
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| 01/18/2006 | CN1721653A Electric control hydraulic braking arrangement |
| 01/12/2006 | US20060005962 Pipe running tool |
| 01/11/2006 | CN2751131Y Line boring machine |
| 01/05/2006 | US20060000619 Method and apparatus for drilling and servicing subterranean wells with rotating coiled tubing |
| 01/04/2006 | EP0694114B2 Automatic drilling system |
| 12/29/2005 | US20050284659 Closed-loop drilling system using a high-speed communications network |
| 12/28/2005 | CN2748626Y Opening mechanism |
| 12/22/2005 | WO2005121493A2 Top drive |
| 12/22/2005 | US20050279507 Tubular clamp apparatus for top drives & methods of use |
| 12/22/2005 | US20050279492 Wellbore top drive systems |
| 12/22/2005 | DE10344352B4 Bohrgerät und Verfahren zum Einbringen eines Bohrelementes in den Boden Drill and method for introducing a drilling element into the soil |
| 12/21/2005 | EP1458949A4 Rotary support table |
| 12/15/2005 | US20050274548 System for directional boring including a drilling head with overrunning clutch and method of boring |
| 12/15/2005 | US20050274508 Wellbore top drive systems |
| 12/08/2005 | US20050269104 Top drive systems |
| 12/08/2005 | US20050269072 Wellbore top drive power systems & methods of use |
| 12/07/2005 | EP1303680B1 Rock drilling machine |
| 12/01/2005 | WO2005113928A2 System for directional boring including a drilling head with overrunning clutch and method of boring |
| 11/30/2005 | CN2743524Y Driving device used for drill rod of rotary dig drill machine |
| 11/29/2005 | US6969071 Face seal assembly |
| 11/24/2005 | WO2005110020A2 Apparatus and method for modified horizontal directional drilling assembly |
| 11/24/2005 | US20050257933 Casing running head |
| 11/24/2005 | US20050257385 Mode selection mechanism for power tool, and power tool incorporating such mechanism |
| 11/23/2005 | EP1598134A1 Mode selection mechanism for power tool, and power tool incorporating such mechanism |
| 11/23/2005 | CN1699027A Mode selection mechanism for power tool, and power tool incorporating such mechanism |
| 11/10/2005 | DE202005013819U1 Seal of a double rotary head for rotary platforms has hollow shaft linked tight to pipe and rod connections, rotatable within a casing into which a casing ring is screwed and the shaft sealed against boring fluid |
| 11/09/2005 | CN1693653A Support type universal drilling machine |
| 11/03/2005 | DE102004017946A1 Akkumulatorbetriebene Handwerkzeugmaschine Akkumulatorbetriebene hand tool |
| 11/02/2005 | CN1690356A Dust-free positioning electric drill adapter |
| 10/27/2005 | US20050236170 Power tool having noise reducing structure |
| 10/27/2005 | US20050236169 Machine tool having coaxial driving device |
| 10/20/2005 | US20050230153 Device for simulataneously casing a hole while drilling |
| 10/20/2005 | US20050230135 Rechargeable battery-operated hand machine tool |
| 10/20/2005 | US20050230133 Gear transmission device for power tool |
| 10/19/2005 | CN1683807A Gear transmission device for power tool |
| 10/19/2005 | CN1683118A Rechargeable battery-operated hand machine tool |
| 10/18/2005 | US6955232 Equipment for drilling vertical boreholes |
| 10/12/2005 | CN2732973Y Multifunctional hydraulic jumbolter |
| 10/05/2005 | CN2731063Y Integral belt driving device for belt parallel operation |
| 10/04/2005 | US6951256 Machine tool having coaxial driving device |
| 09/28/2005 | CN2729290Y Pile drilling machine with main power driven by stepless speed regulating motor |
| 09/28/2005 | CN2729288Y Speed reducer of electric drill for coal petrography |
| 09/15/2005 | WO2005085579A1 Boring system and method therefor |
| 09/14/2005 | CN2725497Y Drill rod driving buffer device |
| 09/14/2005 | CN2725496Y Pneumatic anchor rod drill motor air supply mechanism |
| 09/14/2005 | CN1667235A Top driving sliding type drilling rod clamp |
| 09/14/2005 | CN1219152C Desert screw drilling machine vehicle |
| 09/08/2005 | US20050194189 Mobile drilling rig |
| 09/07/2005 | EP1421252A4 Washpipe assembly |
| 09/07/2005 | CN2723663Y Screw digging drilling rig power head |
| 09/07/2005 | CN2723662Y Multiple shaft drilling rig power head |
| 09/07/2005 | CN2723661Y Well-rig |
| 09/06/2005 | US6938709 Pipe running tool |
| 08/31/2005 | EP1568847A2 Method and apparatus for handling tubular goods |
| 08/25/2005 | WO2005047638A3 Drilling apparatus with anti-vibration inertial body |
| 08/24/2005 | CN2720127Y Speed-changeable well-drilling pump drive device |
| 08/24/2005 | CN2720079Y Hydraulic driven well drilling machine |
| 08/24/2005 | CN2720078Y Drill-bit opening mechanism |
| 08/17/2005 | EP1427663A4 Load compensator for a pipe running tool |
| 08/11/2005 | US20050173154 Method and system for connecting pipe to a top drive motor |
| 08/10/2005 | CN2716482Y Envelope wheel for drill pipe of pile-driving drilling rig |
| 08/10/2005 | CN2716481Y Piling drilling rig |
| 08/10/2005 | CN2716480Y Extrusion diameter changing drilling tool |
| 08/09/2005 | US6925807 Actuator control system for hydraulic devices |
| 08/03/2005 | CN1648402A Root pile buried pipe excavator |
| 07/27/2005 | EP1190155B1 Rock drill and mounting frame |
| 07/27/2005 | CN2713115Y Rotating mechanism of pneumatic jumbolter |
| 07/27/2005 | CN2713114Y Power unit engineering driller with pressure and tension automatic drilling functions |
| 07/21/2005 | CA2455543A1 Method of reducing wear in a backup seal sealing a bearing chamber of a downhole tool |
| 07/13/2005 | CN1637229A Boring device and method for introducing a boring element into the ground |
| 07/13/2005 | CN1210485C Rock drill and mounting frame |
| 07/06/2005 | CN2708033Y Brake sheet special for oil rig |
| 07/06/2005 | CN1635259A Hot spring exploitation |
| 07/05/2005 | US6913096 Top drive well drilling apparatus |
| 06/29/2005 | EP1548226A1 Boring device and method for introducing a boring element into the ground |
| 06/23/2005 | US20050133266 Rotating drilling head drive |
| 06/23/2005 | US20050133264 Drilling apparatus and method for introducing a drilling element into the soil |
| 06/22/2005 | CN2705593Y Electronic head driller and disc type brake interface |
| 06/16/2005 | US20050126821 All terrain vehicle powered mobile drill |
| 06/08/2005 | CN2703859Y Well controllable guiding tool |
| 06/01/2005 | EP1466067A4 Offset elevator for a pipe running tool and a method of using a pipe running tool |
| 06/01/2005 | CN1621862A Wave detector embedding machine |
| 05/26/2005 | WO2005047638A2 Drilling apparatus with anti-vibration inertial body |
| 05/25/2005 | CN2702040Y Pneumatic drilling machine for thin seam blasting mining working face |
| 05/25/2005 | CN2702039Y Automatic bit feed device of disc brake |
| 05/24/2005 | US6896048 Rotary support table |
| 05/19/2005 | WO2005045177A1 Make-up control system for tubulars |
| 05/19/2005 | US20050103529 Quick-detach vehicle-mounted auger driver |
| 05/18/2005 | CN2700642Y Rotary type gear box used for vertical shaft drilling machine |
| 05/12/2005 | WO2004097160B1 System and method using a continuously variable transmission to control one or more system components |
| 05/12/2005 | US20050098354 Drilling apparatus with anti-vibration inertial body |
| 05/12/2005 | DE10360912B3 Drilling device for sinking bore element in ground has rotary drive and chuck rotation devices engaging bore element for assisting torque provided by rotary drive |
| 05/06/2005 | WO2005040548A1 Method and apparatus for controlling the ascent and descent of pipe in a well bore |
| 05/06/2005 | WO2004011812A3 Actuator control system for hydraulic devices |
| 04/27/2005 | CN2695597Y Cylinder anti-skid lock device of pneumatic rockbolt drilling machine |
| 04/14/2005 | US20050077084 Make-up control system for tubulars |
| 04/13/2005 | EP0932745B1 Continuous circulation drilling method |
| 04/13/2005 | CN1606653A Rotary support table |
| 04/07/2005 | DE4323126B4 Handgeführtes Bohrgerät The hand-held drill |
| 04/06/2005 | EP1121508B1 Drilling method |