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

Article 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.

Keywords

deviated borehole transverse isotropy acoustic mode waves dispersion curve sensitivity analysis 
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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Le Liu
    • 1
  • WeiJun Lin
    • 1
  • HaiLan Zhang
    • 1
  • XiuMing Wang
    • 1
  1. 1.State Key Laboratory of Acoustics, Institute of AcousticsChinese Academy of SciencesBeijingChina

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