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Design of a downhole high-power voltage-regulated power supply system for logging-while-drilling systems based on PWM

  • Borehole geophysics
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Abstract

High-power turbine generators are needed in logging-while-drilling systems to supply power to the downhole instruments. The current high-power power supply system employs a rectifier-voltage regulator, and the rectified direct-current (DC) voltage increases with the mud flow rate. Moreover, as voltage regulator modules operate in limited ranges, various impellers and guide wheel combinations are generally used to generate electronic power. In practice, it is necessary to adjust different impeller and guide wheel combinations according to the mud pump discharge rate at the operation well site to change the flow rate of the mud on the impeller to meet the voltage range requirements of the DC conversion module. This study uses theoretical analysis and simulation calculations, applies a proportional–integral–differential closed-loop control model, and completes the design of a power supply system modulated and stabilized using pulse-width modulation (PWM). Moreover, the study involves analyzing its active-control rectification characteristics, conversion efficiency, and load-adjustment response time with an alternating-current (AC) voltage input of 60–150 Vms. The results suggest that the regulated power supply system can achieve active rectification over various AC inputs, ensuring that the bus voltage always meets the design requirements with high efficiency and satisfactory load adaptability. Therefore, a set of impeller and guide wheel combination based on this stabilized, modulated power supply system can be achieved to meet the operational needs of various AC power inputs under different mud flow ranges, improve applicability in different working wells.

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Acknowledgments

We thank the reviewers and editors for their thoughtful comments that greatly improved the manuscript.

This work was supported by:

1. the Science and technology projects of China National Petroleum Corporation: “Research on key technologies of continuous wave transmission and power supply system based on integrated LWD system (2021DQ0409).

2. the Science and technology projects of China National Petroleum Corporation: “Development of high temperature and high-pressure imaging logging while drilling tool (2021DJ3902).

3. the Science and technology projects of CNPC Oilfield Service Company: “Development of intelligent drilling systems (2022T-005-001).

Author information

Authors and Affiliations

  1. Research Institute of Logging Technology, China National Logging Corporation, Beijing, 100200, China

    Yao Liang, An-Zong Li, Wen-Hui Chen, Shi-Xue Chen & Yan Sun

  2. Science and Technology Department, China National Logging Corporation, Xi’an, 710077, China

    Chuan-Wei Li

  3. CNPC Tubular Goods Research Institute, Xi’an, 710077, China

    Yao Liang

Authors
  1. Yao Liang
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  2. An-Zong Li
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  3. Wen-Hui Chen
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  4. Chuan-Wei Li
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  5. Shi-Xue Chen
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  6. Yan Sun
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Corresponding author

Correspondence to Yao Liang.

Additional information

Liang Yao received a bachelor’s degree in 2010 in Measurement, Control Technology and Instrument from Xi’an Shiyou University, a master’s degree in 2013 in Precision Instrument and Machinery from Xi’an Shiyou University, and a doctorate degree in 2020 in Geological Resources and Geological Engineering from China University of Petroleum (Beijing). He is a senior engineer at the Research Institute of Logging Technology, China National Logging Corporation. His research interests are rotary steering systems and logging-while-drilling systems.

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Liang, Y., Li, AZ., Chen, WH. et al. Design of a downhole high-power voltage-regulated power supply system for logging-while-drilling systems based on PWM. Appl. Geophys. 20, 1–8 (2023). https://doi.org/10.1007/s11770-022-0959-x

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  • DOI: https://doi.org/10.1007/s11770-022-0959-x

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