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Exact Three-Dimensional Electromagnetic Model: MWD/LWD Anisotropic Prediction for Rh and Rv

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In resistivity log analyses, it is common to correct "apparent resistivity" predictions for borehole, shoulder bed, wellbore mud and fluid invasion effects. While this is important, the use of apparent resistivities is often based on the assumption of a homogeneous isotropic background medium. This is generally not true in modern logging applications. While more sophisticated analyses are available to study anisotropy, many of the methods are proprietary and unpublished. In this paper, we illustrate how, using a new fully three-dimensional electromagnetic model (applicable to fi berglass or metal mandrels and larger-size transmitter and receiver coils in layered anisotropic media with dip), both Rh and Rv resistivities can be straightforwardly predicted from standard tool measurements. Because both the model and application are new, we will review the underlying theory and numerical implementation before describing the detailed procedures developed to study MWD/LWD anisotropy.
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Document Type: Research Article

Publication date: 01 October 2015

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