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Gas recovery from low-permeability muddy silt gas hydrate reservoirs by depressurization coupled with hot water injection: Impact of hydro-lock effect

Author

Listed:
  • Ye, Hongyu
  • Chen, Jingyu
  • Yao, Yuanxin
  • Chen, Daoyi
  • Wu, Xuezhen
  • Li, Dayong
  • Zi, Mucong

Abstract

Thermal stimulation via injecting hot water can assist depressurization in natural gas hydrate (NGH) exploitation. However, whether depressurization coupled with the thermal stimulation (DP + TS) model can enhance gas production in muddy silt NGH reservoirs is still debated. In this study, we aimed to perfect research on the DP + TS model by proposing a hydro-lock effect that can delay pressure propagation and hinder heat and mass transfer in NGH reservoirs. In addition, we established a THMC model to simulate NGH reservoirs located at Site W17 to investigate the production enhancement of the DP + TS model in the initial state and the hydraulic fracturing state. Results indicate that (i) injecting water into reservoirs may cause pressure-holding, NGH reformation, and permeability damage, making the DP + TS model fail to enhance gas recovery and produce additional water. (ii) Hydraulic fracturing enhances permeability, maintaining higher hot water injection rates, easing hydro-lock, and promoting efficient heat and mass transfer. (iii) The DP + TS model can only enhance production when the permeability of the fractured area exceeds a certain value, but its energy efficiency is still lower than that of pure depressurization. These key findings can fill knowledge gaps in the DP + TS model and provide guidance in future NGH exploitation.

Suggested Citation

  • Ye, Hongyu & Chen, Jingyu & Yao, Yuanxin & Chen, Daoyi & Wu, Xuezhen & Li, Dayong & Zi, Mucong, 2025. "Gas recovery from low-permeability muddy silt gas hydrate reservoirs by depressurization coupled with hot water injection: Impact of hydro-lock effect," Energy, Elsevier, vol. 316(C).
    • Handle: RePEc:eee:energy:v:316:y:2025:i:c:s0360544225000556
    DOI: 10.1016/j.energy.2025.134413
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