Gravity gradiometry in a wellbore using a virtual long-baseline
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United States of America Patent
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Oct 13, 1998
Grant Date -
N/A
app pub date -
Apr 10, 1997
filing date -
Apr 10, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of obtaining gravity gradient well logs over selected baselines, using a well log tool having first and second gravity meters separated by a fixed distance, referred to as the baseline, is disclosed. Gravity gradient measurements are obtained in the wellbore by stepping the tool along the wellbore, where readings at adjacent depths are obtained by setting one of the gravity meters at the same depth at which the other gravity meter is or was located in another reading; alternatively, the well log tool may include a single gravity meter, with readings at adjacent depths made by moving the tool along the wellbore by the baseline. The user or computer system selects a virtual baseline, corresponding to a multiple of the gravity gradient measurements. The gravity gradient is then obtained by summing the individual gravity gradient measurements and dividing by the number of summed measurements. The virtual baseline provides the ability to increase the radius of investigation from that which is provided by the tool itself, and permits selection of varying baselines in deriving the gradient log.
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