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Drilling Apparatus and Method

  • US 20100108383A1
  • Filed: 11/04/2008
  • Published: 05/06/2010
  • Est. Priority Date: 11/03/2008
  • Status: Active Grant
First Claim
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1. An apparatus for use in drilling a borehole, the apparatus comprising:

  • (a) an upper assembly which is connectable with a drilling string;

    (b) a lower assembly comprising a rotary drilling motor such that the lower assembly is subjected to a reactive torque during drilling as a result of the operation of the drilling motor;

    (c) an orientable rotatable connection between the upper assembly and the lower assembly;

    (d) a reactive torque control device associated with the orientable rotatable connection, wherein the reactive torque control device is actuatable to selectively allow rotation of the lower assembly relative to the upper assembly or prevent rotation of the lower assembly relative to the upper assembly;

    (e) an orientation sensing device for providing a sensed actual orientation of the lower assembly; and

    (f) a feedback control system associated with the reactive torque control device and the orientation sensing device, for actuating the reactive torque control device in response to the sensed actual orientation of the lower assembly in order to achieve a target orientation of the lower assembly.

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