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Borehole drilling control system, method and apparatus

  • US 7,510,027 B2
  • Filed: 04/17/2007
  • Issued: 03/31/2009
  • Est. Priority Date: 07/09/2004
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a rotary steerable tool having a main tool body having a first end coupled to a bottom hole assembly of a drill string and a second end coupled to a drill bit, the rotary steerable tool comprising an inertial measurement unit to output a measurement used to determine an azimuthal deviation and inclination of the steerable well bore drilling tool during a drilling operation, wherein the main tool body includes an outer housing, wherein the inertial measurement unit is positioned in the outer housing, wherein said main tool body comprises a deflection means arranged to deflect said second end away from a longitudinal axis of the main tool body, wherein said main tool body further comprises a flexible shaft and a further shaft positioned between said drill string and said flexible shaft.

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