| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
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| 03/31/2004 | CN2608668Y 多功能动力头 Multifunction Power Head |
| 03/31/2004 | CN2608667Y Mountainous region drilling machine |
| 03/30/2004 | US6712158 Apparatus and method for coring and/or drilling |
| 03/30/2004 | US6712146 Downhole assembly releasable connection |
| 03/30/2004 | CA2099917C Air percussion drilling hammer for directional drilling applications |
| 03/30/2004 | CA2021391C Compensating ring for a down hole hammer |
| 03/25/2004 | US20040055788 Device for anchoring a drill string in a borehole |
| 03/25/2004 | US20040055786 Positive displacement apparatus for selectively translating expander tool downhole |
| 03/25/2004 | US20040055744 Method and apparatus to vibrate a downhole component |
| 03/24/2004 | CN1484729A Device for anchoring a drill string in a borehole |
| 03/23/2004 | US6708783 Three-dimensional steering tool for controlled downhole extended-reach directional drilling |
| 03/18/2004 | WO2003050375A3 Thrust control apparatus |
| 03/18/2004 | US20040050589 Method of downhole drilling and apparatus therefor |
| 03/16/2004 | CA2210562C Apparatus for completing a subterranean well and associated methods of using same |
| 03/11/2004 | WO2004020826A2 Gerotor mechanism |
| 03/11/2004 | US20040045719 Puller-thruster downhole tool |
| 03/09/2004 | US6702045 Drilling apparatus |
| 03/03/2004 | CN2605374Y Air shielded submersible drilling machine |
| 03/02/2004 | US6698537 Bit retention system |
| 03/02/2004 | CA2210563C Apparatus for completing a subterranean well and associated methods of using same |
| 02/25/2004 | CN1477290A Building block system combined turbine section |
| 02/24/2004 | US6695065 Tubing expansion |
| 02/24/2004 | CA2144497C Modular measurement while drilling sensor assembly |
| 02/18/2004 | CN1476510A Hydraulic drill string accumulator |
| 02/12/2004 | WO2004013449A2 Device for advancing drillings in the ground |
| 02/12/2004 | WO2003069115A3 Method of repair of collapsed or damaged tubulars downhole |
| 02/12/2004 | WO2003058023A8 A power transmission unit of an impactor, a hydraulic jet impactor and the application thereof |
| 02/12/2004 | US20040028536 Hydraulic cam motor |
| 02/12/2004 | US20040026130 Hydraulic drill string accumulator |
| 02/12/2004 | US20040026129 Drive system |
| 02/12/2004 | DE10234338A1 Tunnelling machine has cutting head rotates about journal axis with outer margin translating to a facing peripheral zone |
| 02/12/2004 | DE10234337A1 Tunnelling machine has cutting head linked to drive shaft via an array of conical gears protected by a flexible seal |
| 02/12/2004 | DE10234336A1 Tunnelling machine has cutting head consisting of a number of tools which are assembled to and detachable from a bearing block |
| 02/05/2004 | WO2004011764A1 Device for simultaneously casing a hole while drilling |
| 02/05/2004 | US20040020691 Continuous wellbore drilling system with stationary sensor measurements |
| 02/04/2004 | EP1386387A1 Downhole torque generator |
| 02/04/2004 | EP1386386A1 Downhole torque-generating and generator combination apparatus |
| 02/03/2004 | US6684965 Method and apparatus for operations in underground subsea oil and gas wells |
| 01/29/2004 | US20040016154 Bit striking apparatus for use in an excavator |
| 01/24/2004 | CA2394937A1 Downhole percussion drilling apparatus |
| 01/22/2004 | US20040011520 Downhole motor lock-up tool |
| 01/20/2004 | US6679341 Tractor with improved valve system |
| 01/13/2004 | US6675888 Method and system for moving equipment into and through an underground well |
| 01/13/2004 | CA2210573C Apparatus for completing a subterranean well and associated methods of using same |
| 01/08/2004 | DE10225061A1 Gespülter Gesteinsbohrer Flushed rock drill |
| 01/06/2004 | US6672407 Method of drilling, analyzing and stabilizing a terrestrial or other planetary subsurface formation |
| 01/06/2004 | CA2230185C Puller-thruster downhole tool |
| 12/31/2003 | WO2002055834A8 Device for anchoring a drill string in a borehole |
| 12/31/2003 | CN1464169A Oil storage compensation rubber sealing drive shaft having thrust conical roller bearing |
| 12/23/2003 | CA2240559C Embankment hammer |
| 12/23/2003 | CA2203736C Guided drilling system with shock absorber |
| 12/18/2003 | US20030230893 Spoolable composite coiled tubing connector |
| 12/18/2003 | US20030230430 Pneumatic percussion hammer for generic rotary fluid motors |
| 12/17/2003 | CN2592840Y Hydraulic control apparatus for automatic vertical drilling tool |
| 12/11/2003 | WO2003102352A1 Drill rig combination for rock drilling |
| 12/10/2003 | CN2591209Y Double-drive twisting mechanism for eccentric heel pipe drilling device |
| 12/09/2003 | US6659203 Lockable motor assembly for use in a well bore |
| 12/09/2003 | US6659202 Steerable fluid hammer |
| 12/09/2003 | US6659200 Actuator assembly and method for actuating downhole assembly |
| 12/06/2003 | CA2430513A1 Flushed rock drill |
| 12/04/2003 | WO2003100208A1 Apparatus and method to reduce fluid pressure in a wellbore |
| 12/04/2003 | WO2003100205A1 Method and dual reamer apparatus for forming bored hole |
| 12/02/2003 | CA2036883C Drill head with integral impact hammers |
| 11/26/2003 | EP1365103A2 Continuous wellbore drilling system with stationary sensor measurements |
| 11/25/2003 | US6651744 Bi-directional thruster pig apparatus and method of utilizing same |
| 11/19/2003 | EP1362158A1 Method and apparatus for operations in underground/subsea oil and gas wells |
| 11/13/2003 | US20030209351 Down hole motor |
| 11/11/2003 | US6644424 Core barrel |
| 11/11/2003 | US6644417 Quick reverse mechanism for pneumatic boring tool |
| 11/06/2003 | WO2003029601A3 Percussive rotational impact hammer |
| 11/06/2003 | US20030205374 One trip through tubing window milling apparatus and method |
| 11/04/2003 | US6640910 Long gauge roller vane drilling motor |
| 11/04/2003 | US6640894 Gripper assembly for downhole tools |
| 10/29/2003 | EP0996806B1 Method and apparatus for moving a piston |
| 10/29/2003 | CN2583344Y Combined speed-reducing turbine drilling rig |
| 10/29/2003 | CN1125915C High pressure water jet controllable spin drill bit unit |
| 10/23/2003 | US20030196818 Method and apparatus for one trip tubular expansion |
| 10/23/2003 | US20030196807 One trip through tubing window milling apparatus and method |
| 10/15/2003 | CN2580085Y Anti-dropping device for screw drill driving shaft |
| 10/09/2003 | WO2003083250A1 One trip through tubing window milling apparatus and method |
| 10/09/2003 | US20030188875 Gripper assembly for downhole tractors |
| 10/09/2003 | CA2614922A1 Lock for downhole fluid driven motor |
| 10/08/2003 | EP1350002A1 Device for anchoring a drill string in a borehole |
| 10/07/2003 | US6629571 Downhole motor assembly |
| 10/07/2003 | US6629570 Method of downhole drilling and apparatus therefor |
| 10/02/2003 | WO2003080994A1 A method for deforming a tubular member |
| 10/02/2003 | US20030183388 One trip through tubing window milling apparatus and method |
| 10/01/2003 | EP1198654B1 Lockable motor assembly for use in a well bore |
| 10/01/2003 | EP1144801B1 Method and system for moving equipment into and through an oil and/or gas production well |
| 10/01/2003 | EP0991845B1 Earth formation surveying device |
| 09/30/2003 | US6626248 Assembly and method for jarring a drilling drive pipe into undersea formation |
| 09/25/2003 | WO2003078837A1 Hydraulic automatic boosting pump |
| 09/24/2003 | CN1443921A Constant force actuator |
| 09/18/2003 | WO2003076763A1 Method and apparatus for one trip tubular expansion |
| 09/18/2003 | US20030173076 Constant force actuator |
| 09/17/2003 | EP1344893A2 Constant force actuator |
| 09/17/2003 | CN1443266A Backreaming tool |
| 09/10/2003 | EP1040275B1 Method of making stators for moineau pumps |
| 09/09/2003 | CA2125882C Down-the-hole rock drill |
| 09/04/2003 | US20030165360 Method and apparatus for replacement of underground pipe |