1
James B Noble: Directional drilling apparatus and method. Ratner & Prestia, May 19, 1992: US05113953 (129 worldwide citation)

A directional drilling apparatus and method in which the drill bit is coupled to the lower end of a drill string through a universsal joint which allows the bit to pivot relative to the string axis. The bit is contra-nutated in an orbit of fixed radius and at a rate equal to string rotation but in t ...


2
Donald M Sawyer: Gravity oriented directional drilling apparatus and method. Rosenthal & Osha L, April 17, 2001: US06216802 (29 worldwide citation)

An apparatus for orienting a drilling assembly. In one embodiment the apparatus include a first driveshaft coupled to the drilling assembly, a second driveshaft flexibly coupled at one end to the first driveshaft, and an orientation collar disposed outside the first and second driveshafts so that th ...


3
Richard Hutton: Steerable rotary directional drilling tool for drilling boreholes. Merciria, Andrew F Young Esq, Lackenbach Siegel, March 27, 2012: US08141657 (17 worldwide citation)

The present invention provides a directional drilling apparatus and method for use in drilling bore holes. The apparatus comprises a plurality of movably mounted cutting elements, wherein the cutting elements are movable between radially retracted and extended cutting positions. A rotary valve is pr ...


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Allen Peter: Directional drilling apparatus and method. Cambridge Radiation Tech, Cambridge Drilling Automation, March 29, 1995: GB2282165-A (7 worldwide citation)

Directional drilling apparatus comprises a drill string having coiled tubing (10) which extends down a bore being drilled and which is uncoiled as drilling progresses. A leading end of the drill string carries a drilling motor (28) having a body (26) and a bit (32) rotatably driven with respect to t ...


6
Lance D Underwood, Charles H Dewey: Flexible directional drilling apparatus and method. Smith International, Osha Liang, January 4, 2011: US07861802 (6 worldwide citation)

A bottom hole assembly to directionally drill a subterranean formation includes a drill bit, a stabilizer assembly located proximate to and behind the drill bit, a drilling assembly comprising a drive mechanism and a directional mechanism, and a flex member. Optionally, the flex member may be locate ...


7
Robert C Southard: Rotary directional drilling apparatus and method of use. Southard Drilling Technologies, The Matthews Firm, February 1, 2011: US07878267 (5 worldwide citation)

An apparatus for steering a drill string is disclosed herein, the apparatus comprising a drilling motor comprising a rotor, a stator, and at least one fluid passage for flowing drilling fluid to the stator. A blade is fixedly disposed on the exterior surface of the stator. A diverter valve controls ...


8
Alan Martyn Eddison: Directional drilling apparatus and method utilising eccentric stabiliser. Samuel G Layton Jr, Bell Seltzer, December 6, 2001: US20010047884-A1

Directional drilling apparatus (26) for location on a drill string (20) comprises a stabiliser (32) having a mandrel (38) for connection to the drill string (20) and an eccentric non-rotating element (46) mounted on the mandrel (38) for offsetting the string (20) in the bore (22) and a non-rotating ...


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Noble James Bain: Appareil et methode de percage directionnel, Directional drilling apparatus and method. Directional Drilling Dynamics, FETHERSTONHAUGH & CO, February 2, 1999: CA2002135

A directional drilling apparatus and method in which thedrill bit is coupled to the lower end of a drill stringthrough a universal joint which allows the bit to pivotrelative to the string axis. The bit is contra-nutated inan orbit of fixed radius and at a rate equal to stringrotation but in the opp ...