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Investigation on coal permeability evolution considering the internal differential strain and its effects on CO2 sequestration capacity in deep coal seams

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Listed:
  • Lin, Xiaosong
  • Liu, Zhengdong
  • Zhu, Wancheng
  • Zhao, Tingting
  • Liu, Shuyuan
  • Sun, Chen
  • Bai, Gang
  • Zhang, Yihuai

Abstract

The gas adsorption/desorption-induced coal deformation effect is a significant factor governing the evolution of coalbed permeability. Current theoretical investigations typically coal bulk and fracture deformation induced by gas are equivalent, neglecting the matrix-fracture interactions. Based on internal adsorption stress, this paper proposes Internal Differential Strain Coefficient (IDSC) to quantitatively characterize the relationship between coal bulk and fracture strain under equilibrium conditions. Coupling this coefficient constructs a binary gas permeability evolution model considering matrix-fracture interactions. Through numerical simulations of CO2-ECBM processes under various internal differential strain circumstances using this model, dynamic evolution patterns of diverse parameters are obtained. The research findings indicate that along the direction of CO2 injection, matrix-fracture interactions exhibit a complex trend of initially increasing, then decreasing and then increasing, and the increase in internal differential strain levels results in a downward trend in permeability peak. Additionally, the evolutionary characteristics of CH4 recovery and cumulative CO2 storage rising with increasing internal differential strain levels were obtained on time scales using a fixed-point monitoring methodology. Inspired by the aforementioned laws, this paper discusses the macroscopic influence of burial depth on the effects of internal differential strain, providing new theoretical support for CO2 sequestration injection methods in deep coal seams.

Suggested Citation

  • Lin, Xiaosong & Liu, Zhengdong & Zhu, Wancheng & Zhao, Tingting & Liu, Shuyuan & Sun, Chen & Bai, Gang & Zhang, Yihuai, 2024. "Investigation on coal permeability evolution considering the internal differential strain and its effects on CO2 sequestration capacity in deep coal seams," Energy, Elsevier, vol. 304(C).
    • Handle: RePEc:eee:energy:v:304:y:2024:i:c:s0360544224018000
    DOI: 10.1016/j.energy.2024.132026
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    References listed on IDEAS

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    1. Zhou, Lijun & Zhou, Xihua & Fan, Chaojun & Bai, Gang & Yang, Lei & Wang, Yiqi, 2023. "Modelling of flue gas injection promoted coal seam gas extraction incorporating heat-fluid-solid interactions," Energy, Elsevier, vol. 268(C).
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    3. Bai, Gang & Su, Jun & Fu, Shigen & Li, Xueming & Zhou, Xihua & Wang, Jue & Liu, Zhengdong & Zhang, Xun, 2024. "Effect of CO2 injection on the gas desorption and diffusion kinetics: An experimental study," Energy, Elsevier, vol. 288(C).
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