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Temperature-Adaptive Excitation Technology for Acoustic Logging Monopole Transducers.

Kai Zhang1,2, Xinyan Wang2, Baohai Tan1,2

  • 1State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266555, China.

Sensors (Basel, Switzerland)
|February 27, 2026
PubMed
Summary

High temperatures degrade acoustic logging tools. This study developed a temperature-adaptive excitation circuit to maintain transducer performance, improving oil and gas exploration in deep wells.

Keywords:
adaptive adjustmentexcitation circuitimpedance matchingmonopole transducersonic loggingtemperature sensitivity

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Area of Science:

  • Geophysics
  • Materials Science
  • Petroleum Engineering

Background:

  • Acoustic logging tools are vital for oil and gas exploration, utilizing piezoelectric transducers to generate signals.
  • Downhole high temperatures degrade piezoelectric ceramics, causing impedance mismatch and reduced tool performance.
  • Current excitation circuits fail to compensate for temperature-induced resonant frequency drift.

Purpose of the Study:

  • To investigate the impact of high temperatures on monopole transducer electrical parameters and excitation energy.
  • To design and implement a temperature-adaptive excitation circuit for acoustic logging tools.
  • To enhance the operational stability and performance of downhole acoustic logging systems.

Main Methods:

  • Experimental determination of electrical parameters and excitation energy of monopole transducers at varying temperatures.
  • Calculation of optimal matching inductance values across different temperature ranges.
  • Design and implementation of a novel excitation circuit with temperature-adaptive frequency adjustment and programmable inductor selection.

Main Results:

  • The temperature-adaptive circuit significantly boosted transducer excitation energy under high-temperature conditions.
  • Optimal matching inductance values were successfully calculated for various downhole temperatures.
  • The circuit effectively compensated for resonant frequency drift caused by temperature variations.

Conclusions:

  • The developed temperature-adaptive excitation circuit markedly improves the high-temperature performance of acoustic logging tools.
  • This technology enhances operational stability, crucial for deep and ultra-deep oil and gas resource exploration.
  • The findings contribute to more reliable downhole measurements and efficient energy resource development.