Steerable bit system assembly and methods

Details Steerable bit system assembly and methods Steerable bit system assembly and methods

2011-04-26

2011-04-26

Bagnell, David J (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S073000, C175S266000

Reexamination Certificate

active

07931098

ABSTRACT:
A drilling system includes a steerable bottomhole assembly (BHA) having a steering unit and a control unit that provide dynamic control of drill bit orientation or tilt. Exemplary steering units can adjust bit orientation at a rate that approaches or exceeds the rotational speed of the drill string or drill bit, can include a dynamically adjustable articulated joint having a plurality of elements that deform in response to an excitation signal, can include adjustable independently rotatable rings for selectively tilting the bit, and/or can include a plurality of selectively extensible force pads. The force pads are actuated by a shape change material that deforms in response to an excitation signal. A method of directional drilling includes continuously cycling the position of the steering unit based upon the rotational speed of the drill string and/or drill bit and with reference to an external reference point.

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