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Re-evaluation relating to compressibility in coalbed methane reservoirs during hydrogen storage

Author

Listed:
  • Li, Jianhua
  • Li, Bobo
  • Song, Haosheng
  • Ding, Yunna
  • Zeng, Xianwei

Abstract

Coal is known to have transversely isotropic properties, that affects coal compressibility and permeability. As compressibility is one of the most important reservoir properties relating to coal gas/energy storage engineering, it was thought essential to understand the effect of coal transversely isotropic properties on coal compressibility. In this work, a new theoretical approach has been proposed with respect to modeling in order to analyze coal compressibility, including volume compressibility, and cleat-volume compressibility. With reference to the volume strain test data regarding CH4 and CO2 under unconstrained conditions, it became possible to determine coal bulk compressibility. Further, the calculation model relating to coal bulk compressibility was verified by combining those calculated results. The experimental data corresponded well with the modeled coal bulk compressibility change results during the gas injection pressure stage under unconstrained conditions. From that premise coal cleat-volume compressibility was further estimated. In agreement with the proposed model, coal bulk and cleat-volume compressibility under different adsorptive gases was predicted. The results showed that, compressibility relating to coal bulk and cleat revealed a strong pressure dependence on adsorbed gas. When gas pressure exceeded approximately 4.0 MPa, changes in coal bulk compressibility during CO2 injection gradually tended to be inactive. However, the bulk compressibility of H2, including the non-adsorptive gas injection process always proved negative, with the change process being stable. In addition, application of research results with respect to coal strength modeling was also discussed. Consequently, the proposed model framework could be combined with coal stability evaluation model to assess coal stability during gas injection and extraction, which would be important for the development of coal hydrogen storage engineering.

Suggested Citation

  • Li, Jianhua & Li, Bobo & Song, Haosheng & Ding, Yunna & Zeng, Xianwei, 2025. "Re-evaluation relating to compressibility in coalbed methane reservoirs during hydrogen storage," Energy, Elsevier, vol. 336(C).
    • Handle: RePEc:eee:energy:v:336:y:2025:i:c:s0360544225040721
    DOI: 10.1016/j.energy.2025.138430
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