GRADIENT INDUCTION LOGGING TOOL HAVING DIRECT FIELD CANCELATION WITH OPTIONAL COMPENSATION
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United States of America Patent
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Issued Date -
Dec 22, 2016
app pub date -
Dec 26, 2013
filing date -
Dec 26, 2013
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Abstract
Direct field cancelation with optional receive antenna compensation is provided in at least some gradient induction logging tool embodiments. Illustrative embodiments include a spatial gradient antenna arrangement having multiple spatially-separated multi-component coil antennas and a multi-component coil antenna having bucking coils that cancel the effects of both the direct field and the gradient of the direct field on the receive signal. Other tool embodiments include a multi-component coil antenna and a spatial gradient antenna arrangement having spatially separated multi-component coil antennas with bucking coils that cancel the effects of both the direct field and the gradient of the direct field on the receive signal. Those embodiments employing a spatial gradient antenna arrangement for receiving may further be configured to provide compensated measurements by combining measurements from rotated orientations of the spatial gradient antenna. Systems and methods employing such tool embodiments may provide increased induction logging tool functionality and enhanced measurement resolution.
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