ABSTRACT

A new analytical solution for acoustic wave propagation in a borehole with an eccentric mandrel is used to compute wavenumbers and excitation vectors for several guided modes as a function of tool position. Parameters used in the examples are relevant for slow shear wave logging-while-drilling applications where a large steel mandrel is free to move laterally about the borehole during data acquisition. An interesting mode splitting phenomenon is featured.

Keywords:
mode splitting, flexural mode, monopole component, borehole, excitation vector, log analysis, eccentric mandrel, splitting, eigenvector, eccentricity
Subjects:
Formation Evaluation & Management, Open hole/cased hole log analysis
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2004. Society of Exploration Geophysicists
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