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A Review of Research on Cavity Growth in the Context of Underground Coal Gasification

Author

Listed:
  • Huijun Fang

    (China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China
    PetroChina Coalbed Methane Company Limited, Beijing 100028, China)

  • Yuewu Liu

    (Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
    School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Tengze Ge

    (China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China
    PetroChina Coalbed Methane Company Limited, Beijing 100028, China)

  • Taiyi Zheng

    (Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China)

  • Yueyu Yu

    (China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China
    PetroChina Coalbed Methane Company Limited, Beijing 100028, China)

  • Danlu Liu

    (China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China
    PetroChina Coalbed Methane Company Limited, Beijing 100028, China)

  • Jiuge Ding

    (Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China)

  • Longlong Li

    (Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China)

Abstract

Underground Coal Gasification (UCG) is a leading-edge technology for clean and effective utilization of coal resources, especially for deep coal seams with a depth of more than 1000 m. Since the core operation place of UCG is the cavity, mastering the cavity growth pattern is a prerequisite to ensure the efficient and economic development of UCG. At present, scholars have conducted numerous research works on cavity growth, but the simulation conditions limit the research results. Hence, it is necessary to summarize and sort out the research results of cavity growth patterns, which contribute to deepening the understanding of UCG and pointing out the direction for subsequent research. First of all, this paper summarizes the development history of UCG technology and describes the cavity growth mechanism from chemical reactions and thermo-mechanical failure. Then, the research methods of cavity growth are summarized from three aspects: a field test, laboratory experiment, and numerical simulation. The results show that the appearance of the cavity is teardrop-shaped, and its growth direction is obviously related to the gas injection method, including the injection direction and rate. Subsequently, the factors affecting the cavity growth process are expounded from the geological factors (permeability, moisture content, and coal rank) and operating factors (temperature, pressure, gasification agent’s composition, and gasification agent’s flow pattern). Finally, the existing problems and development trends in the cavity growth are discussed. The follow-up research direction should focus on clarifying the cavity growth mechanism of the controlled-retractable-injection-point (CRIP) method of UCG in the deep coal seam and ascertain the influence of the moisture content in the coal seam on cavity growth.

Suggested Citation

  • Huijun Fang & Yuewu Liu & Tengze Ge & Taiyi Zheng & Yueyu Yu & Danlu Liu & Jiuge Ding & Longlong Li, 2022. "A Review of Research on Cavity Growth in the Context of Underground Coal Gasification," Energies, MDPI, vol. 15(23), pages 1-21, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:9252-:d:995337
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    References listed on IDEAS

    as
    1. Javed, Syed Bilal & Uppal, Ali Arshad & Bhatti, Aamer Iqbal & Samar, Raza, 2019. "Prediction and parametric analysis of cavity growth for the underground coal gasification project Thar," Energy, Elsevier, vol. 172(C), pages 1277-1290.
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    5. Prabu, V. & Jayanti, S., 2012. "Laboratory scale studies on simulated underground coal gasification of high ash coals for carbon-neutral power generation," Energy, Elsevier, vol. 46(1), pages 351-358.
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    2. Ján Kačur & Marek Laciak & Milan Durdán & Patrik Flegner, 2023. "Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research," Energies, MDPI, vol. 16(17), pages 1-55, August.

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