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An Electromagnetic Low-Frequency Flextensional Transducer for Acoustic Logging.

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This study introduces a novel low-frequency acoustic transducer for advanced well logging. The electromagnetic monopole transducer, utilizing a flextensional shell, achieves 1300 Hz operation and 150 dB sound pressure level, meeting logging application needs.

Keywords:
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Area of Science:

  • Geophysics
  • Acoustic Engineering
  • Materials Science

Background:

  • Low-frequency acoustic transducers are essential for acoustic imaging and permeability logging technologies.
  • Existing transducers face limitations in performance and size for downhole applications.

Purpose of the Study:

  • To design and develop a novel monopole acoustic transducer driven by electromagnetic force for low-frequency well logging.
  • To optimize the transducer's performance using finite element simulations and parametric analysis.

Main Methods:

  • Finite element simulations were used to evaluate and optimize magnetic circuit configurations.
  • A flextensional shell was designed and simulated under borehole conditions.
  • A dedicated excitation circuit was developed for the transducer.

Main Results:

  • An optimized inner magnet circuit configuration was identified.
  • The fabricated prototype operated at 1300 Hz with a sound pressure level of approximately 150 dB.
  • Uniform circumferential radiation was achieved, fulfilling logging requirements.

Conclusions:

  • The developed electromagnetic monopole acoustic transducer effectively meets the demands of low-frequency acoustic logging applications.
  • The study demonstrates the viability of flextensional shells for high-performance acoustic transducers in downhole tools.