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Rotary steerable tool including drill string rotation measurement apparatus

  • US 20070107937A1
  • Filed: 11/14/2005
  • Published: 05/17/2007
  • Est. Priority Date: 11/14/2005
  • Status: Active Grant
First Claim
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1. A downhole steering tool, configured to operate in a borehole, comprising:

  • a shaft;

    a housing deployed about the shaft, the housing and shaft disposed to rotate substantially freely with respect to one another;

    a plurality of blades deployed on the housing, the blades disposed to extend radially outward from the housing and engage a wall of the borehole, said engagement of the blades with the borehole wall operative to eccenter the housing in the borehole; and

    , first and second sensor sets deployed at corresponding first and second positions in the housing and disposed, in combination, to measure a substantially real-time rotation rate of the housing in the borehole, each of the sensor sets including at least one accelerometer disposed to measure a cross-axial acceleration component.

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