Abstract
Wireline resistivity tools in vertical or near vertical holes are run with centralizers to keep the tool near the center of the borehole. In this environment the borehole signal usually behaves in a predictable manner and is not difficult to compensate. An MWD resistivity measurement tool is now often run in highly deviated or horizontal well completions. The rotation of the drill pipe produces continuous lateral as well as axial motion of the resistivity tool. A resistivity tool measurement is a function of the tool standoff distance x s from the borehole wall. When x s is small and the tool surface is near the borehole wall, the effect can be large. In this regime, the magnetic dipole mathematical model, particularly for short array spacings, is not adequate. This paper formulates and computes the finite-size loop electromagnetic response near an idealized interface. Graphical results compare the proximity effect predicted by loop and dipole theories.
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