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Acoustic source characterization for a logging while drilling tool: Theoretical and experimental modeling.

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Area of Science:

  • Geophysics
  • Acoustic Engineering

Background:

  • Acoustic logging while drilling (LWD) relies on effective acoustic source technology.
  • Various LWD acoustic source designs have been developed to improve performance.

Purpose of the Study:

  • To theoretically model and experimentally validate the constituent components of LWD acoustic sources.
  • To provide a framework for evaluating LWD acoustic source performance.

Main Methods:

  • Utilizing multipole wave expansion theory to represent LWD acoustic sources.
  • Conducting experimental validation using a cylindrical pipe simulating an LWD collar.

Main Results:

  • Demonstrated that LWD acoustic sources can be decomposed into monopole, dipole, and quadrupole constituents.
  • Characterized LWD acoustic sources by the contribution of each constituent component.

Conclusions:

  • The multipole expansion theory accurately describes LWD acoustic sources.
  • This research offers a novel method for assessing the performance of LWD acoustic sources.