Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2007-10-30
2007-10-30
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S073000
Reexamination Certificate
active
10938189
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.
REFERENCES:
patent: 5158109 (1992-10-01), Hare
patent: 5220963 (1993-06-01), Patton
patent: 5341886 (1994-08-01), Patton
patent: 5419405 (1995-05-01), Patton
patent: 5671816 (1997-09-01), Tibbitts
patent: 6092610 (2000-07-01), Kosmala et al.
patent: 6257356 (2001-07-01), Wassell
patent: 6568470 (2003-05-01), Goodson, Jr. et al.
patent: 2002/0011358 (2002-01-01), Wassell
patent: 2002/0088648 (2002-07-01), Krueger et al.
patent: 2005/0024232 (2005-02-01), Gardner et al.
patent: 2039567 (1980-08-01), None
patent: 2050466 (1981-01-01), None
patent: 2352464 (2001-01-01), None
Aronstam Peter
Fincher Roger
Watkins Larry
Andrews David
Bagnell David
Baker Hughes Incorporated
Madan Mossman & Sriram P.C.
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