Method of and apparatus for directional drilling

Details Method of and apparatus for directional drilling Method of and apparatus for directional drilling

2005-07-19

2005-07-19

Neuder, William (Department: 3672)

Boring or penetrating the earth

Automatic control

Of boring means including a below-ground drive prime mover

C175S061000

Reexamination Certificate

active

06918453

ABSTRACT:
A method of and system for directional drilling reduces the friction between the drill string and the well bore. A downhole drilling motor is connected to a drilling rig at the surface by a drill string. The drilling motor is oriented at a selected tool face angle. The drill string is rotated at the surface in a first direction until a first torque magnitude is reached without changing the tool face angle. The drill string is then rotated in the opposite direction until a second torque magnitude is reached, again without changing the tool face angle. The drill string is rotated back and forth between the first and second torque magnitudes. Pressure inside the drill string is measured, and the first and second torque magnitudes are adjusted in response to changes in the pressure.

REFERENCES:
patent: 5465799 (1995-11-01), Ho
patent: 6050348 (2000-04-01), Richarson et al.
patent: 2002/0104685 (2002-08-01), Pinckard et al.
Canrig Drilling Technology, Ltd., sales brochure for Directional Steering Control Systems (DSCS).
Jean Michel Genevois, Jean Boulet, and Christophe Simon, Gyrostab Project: The Missing Link Azimuth and inclination mastered with new principles for standard rotary BHAs, Society of Petroleum Engineers, SPE/IADC 79915, Feb. 19, 2003.

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