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Investigation of the Evolution of Stratum Fracture during the Cavity Expansion of Underground Coal Gasification

Author

Listed:
  • Zhen Dong

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    These authors contributed equally to this work.)

  • Haiyang Yi

    (North China Institute of Science and Technology, Langfang 065201, China)

  • Yufeng Zhao

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    These authors contributed equally to this work.)

  • Xinggang Wang

    (Research Institute of Petroleum Exploration & Development, PetroChina Tuha Oilfield Company, Hami 839009, China)

  • Tingxiang Chu

    (North China Institute of Science and Technology, Langfang 065201, China)

  • Junjie Xue

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

  • Hanqi Wu

    (PetroChina Gas Storage Company, Beijing 100101, China)

  • Shanshan Chen

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

  • Mengyuan Zhang

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

  • Hao Chen

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)

Abstract

The evolution of fracture zone controls the safety of underground coal gasification (UCG) in terms of gas emission and water leakage. In order to understand the fracture propagation in the confining rock of a UCG cavity with various influence factors, this paper implemented a set of numerical models based on different geological and operating conditions. Analysis was implemented on the mechanism of fracture propagation and its evolution characteristics, suggesting that (a) continuum expansion of the cavity leads a near-field fracture circle in confining rock initially, followed by the roof caving and successive propagation of shear band. (b) The key observed influence factors of fracture propagation are the grade of confining rock, overburden pressure, dimension of the cavity and gasifying pressure, the linear relationships between them, and the fracture height. Additionally, the fracture depth in the base board was mainly caused by tensile fracture. (c) A model was proposed based on the evolution of fracture height and depth in roof and base board, respectively. Validation of this model associated with orthogonal tests suggests a good capacity for predicting fracture distribution. This paper has significance in guiding the design of the gasifying operation and safety assessment of UCG cavities.

Suggested Citation

  • Zhen Dong & Haiyang Yi & Yufeng Zhao & Xinggang Wang & Tingxiang Chu & Junjie Xue & Hanqi Wu & Shanshan Chen & Mengyuan Zhang & Hao Chen, 2022. "Investigation of the Evolution of Stratum Fracture during the Cavity Expansion of Underground Coal Gasification," Energies, MDPI, vol. 15(19), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:19:p:7373-:d:935872
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    References listed on IDEAS

    as
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