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Pore and permeability changes in coal induced by true triaxial supercritical carbon dioxide fracturing based on low-field nuclear magnetic resonance

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Listed:
  • Pan, Jienan
  • Du, Xuetian
  • Wang, Xianglong
  • Hou, Quanlin
  • Wang, Zhenzhi
  • Yi, Jiale
  • Li, Meng

Abstract

Supercritical carbon dioxide (ScCO2) fracturing is a green, clean, waterless extraction technique that has gained widespread attention. Coal pore properties, such as porosity, pore size distribution, connectivity, and permeability, are critical for fracturing and efficient coalbed methane production. This study examines the effects of ScCO2 fracturing on coal reservoir pore modification by conducting true triaxial ScCO2 fracturing experiments on high-rank coal samples under various stresses and injection rates. Low field nuclear magnetic resonance technique was used to compare and analyse the pore permeability characteristics of the samples before and after ScCO2 fracturing. The research discusses the influence of stress and ScCO2 fracturing fluid injection rate on coal pore modification and its controlling mechanisms. The results show a significant impact on coal pore modification, with a 59.85 % increase in porosity, 60 % increase in pore volume, 56 % increase in pore throat volume, and 47.5 % increase in permeability. Under the same injection rate and fixed temperature (40 °C), higher stress differences (8 MPa) benefit large pore modification and connectivity, while lower stress differences (4 MPa) are more favourable for micropore and transition pore modification and connectivity. These findings contribute to a deeper understanding of the microscopic mechanisms of ScCO2 fracturing in modifying coal pores.

Suggested Citation

  • Pan, Jienan & Du, Xuetian & Wang, Xianglong & Hou, Quanlin & Wang, Zhenzhi & Yi, Jiale & Li, Meng, 2024. "Pore and permeability changes in coal induced by true triaxial supercritical carbon dioxide fracturing based on low-field nuclear magnetic resonance," Energy, Elsevier, vol. 286(C).
    • Handle: RePEc:eee:energy:v:286:y:2024:i:c:s0360544223028864
    DOI: 10.1016/j.energy.2023.129492
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    References listed on IDEAS

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    1. Wang, Lei & Yao, Bowen & Xie, Haojun & Winterfeld, Philip H. & Kneafsey, Timothy J. & Yin, Xiaolong & Wu, Yu-Shu, 2017. "CO2 injection-induced fracturing in naturally fractured shale rocks," Energy, Elsevier, vol. 139(C), pages 1094-1110.
    2. Wang, Zhenzhi & Fu, Xuehai & Pan, Jienan & Deng, Ze, 2023. "Effect of N2/CO2 injection and alternate injection on volume swelling/shrinkage strain of coal," Energy, Elsevier, vol. 275(C).
    3. Middleton, Richard S. & Carey, J. William & Currier, Robert P. & Hyman, Jeffrey D. & Kang, Qinjun & Karra, Satish & Jiménez-Martínez, Joaquín & Porter, Mark L. & Viswanathan, Hari S., 2015. "Shale gas and non-aqueous fracturing fluids: Opportunities and challenges for supercritical CO2," Applied Energy, Elsevier, vol. 147(C), pages 500-509.
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