Journal Article

Acoustic isolation of a monopole logging while drilling tool by combining natural stopbands of pipe extensional waves

Yuan-Da Su, Xiao-Ming Tang, Song Xu and Chun-Xi Zhuang

in Geophysical Journal International

Volume 202, issue 1, pages 439-445
ISSN: 0956-540X
Published online May 2015 | e-ISSN: 1365-246X | DOI: https://dx.doi.org/10.1093/gji/ggv150
Acoustic isolation of a monopole logging while drilling tool by combining natural stopbands of pipe extensional waves

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For extensional wave propagation along a cylindrical pipe, there exists a natural stopband in the frequency range between the first and second modes. This study explores the feasibility and practicality of building a drill collar acoustic extensional-wave isolator by combining the stopbands of pipes of different thicknesses. Numerical modelling shows that this is indeed possible and a stopband of designated width can be obtained using an optimization procedure. Laboratory measurement on an optimized design further verified this concept. The result provides a viable approach for the acoustic isolation design of a logging while drilling acoustic tool.

Keywords: Downhole methods; Guided waves; Wave propagation

Journal Article.  3564 words.  Illustrated.

Subjects: Geophysics ; Oceanography and Hydrology

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