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Apparatus and method for downhole dynamics measurements

  • US 20070289373A1
  • Filed: 06/15/2006
  • Published: 12/20/2007
  • Est. Priority Date: 06/15/2006
  • Status: Active Grant
First Claim
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1. A rotary steerable tool configured to operate in a borehole, the rotary steerable tool comprising:

  • a shaft;

    a housing deployed about the shaft, the shaft disposed to rotate substantially freely in the housing;

    a rotation rate measurement device disposed to measure a rotation rate of the shaft relative to the housing, the rotation rate measurement device including at least one sensor and at least one marker, the sensor disposed to send an electrical pulse to a controller each time one of the markers and the sensor rotate past one another; and

    the controller configured to calculate a stick/slip parameter from said electric pulses.

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