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US08237445B2 Octupole induction sensors for resistivity imaging in non-conductive muds 有权
用于非导电泥浆电阻率成像的八极感应传感器

Octupole induction sensors for resistivity imaging in non-conductive muds
Abstract:
The present disclosure provides a method and apparatus for performing resistivity measurements of a borehole wall using a transverse octupole sensor. The sensor may be a resistivity sensor. Higher resolution is obtained with an octupole sensor than with lower-order-pole sensors. For the resistivity case, the ratio of dual-frequency measurements has reduced sensitivity to standoff.
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