Magnetometers for measurement-while-drilling applications
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United States of America Patent
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Aug 7, 2007
Grant Date -
Sep 15, 2005
app pub date -
Nov 29, 2004
filing date -
Dec 3, 2003
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Abstract
A nuclear sensor on a bottomhole assembly (BHA) makes measurements of a property of an earth formation during continued rotation of the BHA. Magnetometers that are susceptible to bias error are deployed on the BHA to make measurements of the magnetic toolface angle. A processor separates the sensor measurements into azimuthal sectors while compensating for inherent time delays in the electronics, non-uniform rotation, and bias.
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