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A numerical investigation of the acoustic mode waves in a deviated borehole penetrating a transversely isotropic formation

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  • Acoustics
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Abstract

A 2.5-dimensional method in frequency wave-number domain is developed to investigate the mode waves in a deviated borehole penetrating a transversely isotropic formation. The phase velocity dispersion characteristics of the fast and slow flexural mode waves excited by a dipole source are computed accurately at various deviation angles for both hard and soft formations. The sensitivities of the flexural mode waves to all elastic constants in a transversely isotropic formation are calculated. Numerical results show that, for a soft formation, the fast flexural mode wave is dominated by c 66 at high deviation angles and low frequencies, while the slow flexural mode wave is dominated by c 44 at the same conditions. Waveforms in time domain are also presented to support the conclusions.

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Authors and Affiliations

  1. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China

    Le Liu, WeiJun Lin, HaiLan Zhang & XiuMing Wang

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  1. Le Liu
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  2. WeiJun Lin
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  3. HaiLan Zhang
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  4. XiuMing Wang
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Correspondence to WeiJun Lin.

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Contributed by ZHANG HaiLan (Associate Editor)

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Liu, L., Lin, W., Zhang, H. et al. A numerical investigation of the acoustic mode waves in a deviated borehole penetrating a transversely isotropic formation. Sci. China Phys. Mech. Astron. 58, 84301 (2015). https://doi.org/10.1007/s11433-015-5678-3

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  • DOI: https://doi.org/10.1007/s11433-015-5678-3

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