Directional borehole drilling system and method

Details Directional borehole drilling system and method Directional borehole drilling system and method

2007-02-27

2007-02-27

Neuder, William (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S026000, C175S045000, C175S073000

Reexamination Certificate

active

10841002

ABSTRACT:
A directional borehole drilling system employs a controllable drill bit, which includes one or more conical drilling surfaces. Instrumentation located near the bit measures present position when the bit is static, and dynamic toolface when the bit is rotating. This data is processed to determine the error between the present position and a desired trajectory, and the position of one or more of the bit's leg assemblies is automatically changed as needed to make the bit bore in the direction necessary to reduce the error. The controllable drill bit preferably comprises three leg assemblies mounted about the bit's central axis, each leg having a “toed-out” axle. In response to a command signal, a lower leg translates along the bit axis to cause it to bear more of the bit weight, thus excavating more deeply over the commanded toolface sector and causing the bit to bore in a preferred direction.

REFERENCES:
patent: 6349778 (2002-02-01), Blair et al.
patent: 6450269 (2002-09-01), Wentworth et al.
patent: 6484819 (2002-11-01), Harrison
patent: 6691804 (2004-02-01), Harrison

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