| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
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| 03/23/2005 | CN1599834A Downhole assembly releasable connection |
| 03/23/2005 | CN1599833A Thrust control apparatus |
| 03/22/2005 | US6868906 Closed-loop conveyance systems for well servicing |
| 03/16/2005 | CN1193160C Drilling apparatus for drilling well in stratum |
| 03/15/2005 | US6866106 Fluid drilling system with flexible drill string and retro jets |
| 03/10/2005 | WO2004097160A3 System and method using a continuously variable transmission to control one or more system components |
| 03/10/2005 | WO2004073929A3 Percussion tool and method |
| 03/08/2005 | US6863137 Well system |
| 03/03/2005 | US20050045385 Down-the-hole drill hammer |
| 03/03/2005 | US20050045382 Apparatus and method to reduce fluid pressure in a wellbore |
| 03/03/2005 | US20050045380 Drilling apparatus |
| 03/03/2005 | DE10336315A1 Vertical drill, to form a borehole for filling with concrete as a load-bearing pile/ground anchor, has a drill head suspended from a crane with a support system against the borehole wall |
| 03/01/2005 | US6860339 Bit striking apparatus for use in an excavator |
| 02/23/2005 | CN2680843Y Mechanical casing drive head for casing drilling |
| 02/23/2005 | CN2680842Y Hydraulic casing drive head for casing drilling |
| 02/22/2005 | US6857486 High power umbilicals for subterranean electric drilling machines and remotely operated vehicles |
| 02/17/2005 | US20050036338 Waveform independent high frequency power system |
| 02/17/2005 | US20050034899 Fluid distributor device for down-hole-drills |
| 02/15/2005 | US6854953 Speed governor |
| 02/09/2005 | CN1576468A 击打力发生器 Striking force generator |
| 02/03/2005 | WO2005010317A1 Downhole hammer drill |
| 02/03/2005 | CA2533430A1 Down hole hammer drill |
| 02/02/2005 | CN2675841Y Drilling angle regulating system for down-hole drill |
| 01/25/2005 | US6845826 Saver sub for a steering tool |
| 01/20/2005 | WO2004092633A3 Spoolable composite coiled tubing connector |
| 01/19/2005 | EP1497526A2 Bi-directional thruster pig apparatus and method of utilizing same |
| 01/19/2005 | EP1234099B1 Downhole pulser |
| 01/18/2005 | US6843332 Three dimensional steerable system and method for steering bit to drill borehole |
| 01/18/2005 | US6843314 Retrievable through-tubing whipstock apparatus having fluid-responsive pivotal anchoring members |
| 01/13/2005 | WO2005002801A1 Method of generating stress pulse in tool by means of pressure fluid operated impact device, and impact device |
| 01/13/2005 | US20050006148 Assembly for drilling low pressure formation |
| 01/13/2005 | US20050006105 Method and apparatus for through rotary sub-sea pile-driving |
| 01/12/2005 | EP1155216B1 Drilling method |
| 01/06/2005 | US20050000733 Systems and methods for performing mud pulse telemetry using a continuously variable transmission |
| 01/04/2005 | US6837621 Rotor bearing for increased lubricant flow |
| 01/04/2005 | US6837313 Apparatus and method to reduce fluid pressure in a wellbore |
| 01/04/2005 | CA2232940C Apparatus and method for milling a well casing |
| 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 |
| 12/30/2004 | US20040262042 Bit head retaining system and method of installing a bit head in a percussion drill |
| 12/30/2004 | US20040262013 Wired casing |
| 12/29/2004 | WO2004113664A1 Inner and outer motor with eccentric stabilizer |
| 12/29/2004 | WO2004113663A1 Percussive drill with adjustable flow control |
| 12/23/2004 | WO2004111389A1 System and method for transmitting electric power into a bore |
| 12/23/2004 | US20040257836 Rapid current demand microprocessor supply circuit |
| 12/23/2004 | US20040256111 Apparatus for and method of radial expansion of a tubular member |
| 12/22/2004 | CN1556301A Radiation well horizontal radiation pipe full hydraulic construction equipment |
| 12/21/2004 | CA2208906C Apparatus for completing a subterranean well and associated methods of using same |
| 12/16/2004 | WO2003021073A3 Method and apparatus for replacement of underground pipe |
| 12/16/2004 | US20040251051 Downhole tool |
| 12/16/2004 | DE10321617A1 Vorrichtung zur Herstellung eines Erdlochs Apparatus for producing a earthen hole |
| 12/16/2004 | DE10146025B4 Verfahren und System zum horizontalen Erdbohren sowie Schlagspitze und Verfahren zum Starten eines Schlagwerkzeugs Method and system for horizontal Erdbohren and striking tip and method for starting a striking tool |
| 12/15/2004 | EP1485570A2 Thrust control apparatus |
| 12/15/2004 | CN2663639Y Drilling tool for eccentric heel tube of down-the-hole hammer |
| 12/09/2004 | US20040245021 Down-the-hole drill hammer |
| 12/09/2004 | US20040245019 Sleeve piston fluid motor |
| 12/09/2004 | US20040245018 Electrically sequenced tractor |
| 12/09/2004 | US20040244982 Substantially neutrally buoyant and positively buoyant electrically heated flowlines for production of subsea hydrocarbons |
| 12/08/2004 | CN2661900Y Down-the-hole automatic drilling device |
| 12/07/2004 | US6827160 Downhole mud motor |
| 12/02/2004 | WO2004072433A3 Downhole tractor with improved valve system |
| 12/01/2004 | EP1149224B1 Thrust bearing for downhole tool |
| 12/01/2004 | CN1551943A Assembly for drilling low pressure formation |
| 11/25/2004 | WO2004101947A2 Device for drilling a bore in the ground |
| 11/24/2004 | EP1478824A2 Well system |
| 11/24/2004 | CN1177126C Hydraulic in-the-hole hammer with dual nozzle and combined valve |
| 11/23/2004 | CA2040071C Percussive rock cutting tool |
| 11/11/2004 | WO2004097160A2 System and method using a continuously variable transmission to control one or more system components |
| 11/11/2004 | US20040223812 Method and apparatus for replacement of underground pipe |
| 11/11/2004 | US20040222021 Rotary impact well drilling system and method |
| 11/11/2004 | US20040221997 Methods and apparatus for wellbore construction and completion |
| 11/11/2004 | DE10157301B4 Druckmittelbetriebenes Erdbohrgerät und Verfahren zum Einziehen eines Produktrohrs in das Erdreich Pressure medium-operated earth boring and method for retracting a product pipe into the ground |
| 11/10/2004 | CN1544793A Piston type well pumping unit |
| 11/02/2004 | CA2191423C Hydraulic actuator |
| 10/28/2004 | WO2004092633A2 Spoolable composite coiled tubing connector |
| 10/28/2004 | WO2003067016A3 Bi-directional thruster pig apparatus and method of utilizing same |
| 10/26/2004 | US6808030 Enlargement drilling system |
| 10/21/2004 | US20040206550 Down-the-hole drill assembly |
| 10/20/2004 | EP1468163A1 Compressed air percussive mechanism for a down hole hammer and down hole hammer |
| 10/14/2004 | US20040200642 Drilling turbine |
| 10/13/2004 | EP1466069A2 Downhole assembly releasable connection |
| 10/13/2004 | EP0901562B1 Downhole apparatus |
| 10/13/2004 | CN2648037Y Driving mechanism for down-hole drilling machine |
| 10/12/2004 | CA2210614C Spring cartridge rotor bearing |
| 10/07/2004 | WO2004085791A1 A hydraulic drill string device, in particular a hydraulic in-hole rock drilling machine |
| 10/07/2004 | US20040197175 Power tool with battery pack ejector |
| 10/06/2004 | EP1463869A1 Driver |
| 10/06/2004 | EP1463868A1 Down-the-hole drill hammer. |
| 10/06/2004 | CN1534161A Submerged hole driller component element |
| 10/05/2004 | US6799641 Percussive drill with adjustable flow control |
| 09/30/2004 | WO2004083595A2 Substantially neutrally buoyant and positively buoyant electrically heated flowlines for production of subsea hydrocarbons |
| 09/30/2004 | US20040188146 Hydraulic drill string |
| 09/30/2004 | US20040188145 Apparatus and methods for drilling |
| 09/30/2004 | CA2519019A1 Method and apparatus for drilling a borehole with a borehole liner |
| 09/29/2004 | EP1462605A1 Method of modelling a hydrocarbon mixture by subdividing it in pseudocomponents |
| 09/29/2004 | EP1462604A2 Downhole drill assembly |
| 09/23/2004 | US20040182607 Method of forming concrete pilings using a reverse circulation drilling system |
| 09/23/2004 | US20040182580 Puller-thruster downhole tool |
| 09/15/2004 | EP1455635A1 Self-advancing device |
| 09/14/2004 | US6791848 Autobias driving a high frequency power system |