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Experimental study on the permeability evolution of coal with CO2 phase transition

Author

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  • Yao, Hongbo
  • Chen, Yuedu
  • Liang, Weiguo
  • Li, Zhigang
  • Song, Xiaoxia

Abstract

For CO2 sequestration in the deep coal seam, whose permeability would change with the CO2 phase transition. To evaluate this, a large size (Φ100 × 800 mm) raw coal sample, was used to conduct the permeability tests under varying CO2 injection pressures. With the increase of injection pressure, the phase transition of CO2 from subcritical (SubCO2) to supercritical (ScCO2) would alter pressure distribution within the coal, obviously reducing the internal permeability. For SubCO2 injection, the internal permeability decreases nonlinearly along the migration path, and the maximum occurs at the inlet, mainly where the effective stress is larger. However, for ScCO2 injection, the internal permeability forms a “U” shape, and the minimum occurs in the phase transition region, whose effect is greater than its effective stress. Due to the presence of phase transition, a “W” shape variation of CO2 permeability changes with the increasing pore pressure occurs. The CO2 phase transition would affect the coal structure significantly, the pore volume of coal reduced by ScCO2 adsorption is 28.07%, larger than that of 2.63% for SubCO2. This irreversible change reduces the coal permeability by more than 63.3%. This study is meaningful to CO2 sequestration in deep coal seams.

Suggested Citation

  • Yao, Hongbo & Chen, Yuedu & Liang, Weiguo & Li, Zhigang & Song, Xiaoxia, 2023. "Experimental study on the permeability evolution of coal with CO2 phase transition," Energy, Elsevier, vol. 266(C).
    • Handle: RePEc:eee:energy:v:266:y:2023:i:c:s0360544222034181
    DOI: 10.1016/j.energy.2022.126531
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    References listed on IDEAS

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    1. Zhao, Changxin & Cheng, Yuanping & Li, Wei & Wang, Liang & Zhang, Kaizhong & Wang, Chenghao, 2023. "Critical stress related to coalbed methane migration pattern: Model development and experimental validation," Energy, Elsevier, vol. 284(C).
    2. Pan, Jienan & He, Haixia & Li, Guofu & Wang, Xianglong & Hou, Quanlin & Liu, Liangliang & Cheng, Nannan, 2023. "Anisotropic strain of anthracite induced by different phase CO2 injection and its effect on permeability," Energy, Elsevier, vol. 284(C).
    3. Huping Wang & Zhao Wang & Haikui Yin & Chao Jin & Xiaogang Zhang & Langtao Liu, 2023. "CO 2 Flow Characteristics in Macro-Scale Coal Sample: Effect of CO 2 Injection Pressure and Buried Depth," Sustainability, MDPI, vol. 15(10), pages 1-20, May.

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