Method for computation of differential azimuth from spaced-apart gravity component measurements
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United States of America Patent
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Apr 18, 2006
Grant Date -
Oct 27, 2005
app pub date -
Apr 27, 2004
filing date -
Apr 27, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is provided for computing the differential azimuth between two sets of spaced-apart gravity component measurement devices in a borehole, employing multiple rotation angles. The method includes modeling relationships of axes as defined; forming equations relating rotation angles to outputs of gravity measuring devices; solving such equations to derive the values representative of all of the rotation angles, using measured values of the outputs from the first and second sets of gravity component measuring devices, and computing from the values of the rotation angles the differential azimuth angle between the first set and the second set of gravity measuring devices.
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