07287604 is referenced by 43 patents and cites 14 patents.

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.

Title
Steerable bit assembly and methods
Application Number
10/938189
Publication Number
7287604 (B2)
Application Date
September 10, 2004
Publication Date
October 30, 2007
Inventor
Larry Watkins
Houston
TX, US
Roger Fincher
Conroe
TX, US
Peter Aronstam
Houston
TX, US
Agent
Madan Mossman & Sriram P C
Assignee
Baker Hughes Incorporated
TX, US
IPC
E21B 7/08
E21B 7/04
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