Continuous gravity survey of a borehole
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United States of America Patent
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Nov 26, 2013
Grant Date -
Jan 12, 2012
app pub date -
Jul 8, 2010
filing date -
Jul 8, 2010
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Abstract
Gravity measurements from a borehole gravity survey are obtained by continuously moving the gravity meter within the borehole. Movement-induced acceleration errors are quantified and subtracted from the gross measurements from the gravity meter to obtain actual gravity values at a multitude of measurement points within the borehole. Acceleration errors are calculated from the second differential of the true vertical depth of the gravity meter, which is computed measured length and weight and elongation characteristics of a cable which suspends the gravity meter in the borehole, upper and lower tension measurements in the cable, and the topography of the borehole.
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