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Multiphysical evolution and dynamic competition involved in natural gas hydrate dissociation in porous media and its implications for engineering

Author

Listed:
  • Zhang, Haitao
  • Wu, Bisheng
  • Luo, Xianqi
  • Tang, Minggao
  • Zhang, Xuhui
  • Yang, Liu
  • Nie, Yuanxun
  • Zhou, Jiaxing
  • Zhang, Li
  • Li, Guangyao

Abstract

Hydrate (shorted for natural gas hydrate) is one of the most promising future energies, and dissociating hydrate in situ is commonly recognized as the best strategy to realize commercial exploitation. So it is significant to understand the fundamental mechanism in the process of hydrate dissociation involving complicated thermal-hydraulic-mechanical-chemical phenomena. To date, the multiphysical evolution patterns are not revealed by the overall comparison among different phenomena, and we still have little knowledge on the contributions of different influence factors to hydrate dissociation rate. More importantly, the fundamental study has a considerable gap to the real engineering. Therefore, in this paper, a fully-coupled thermal-hydraulic-mechanical-chemical model is developed to further analyze the evolution of all phenomena from both global and local perspectives and find the coupled relationships among physical/chemical phenomena from a dynamic competition perspective. Results show that the global spatial distributions of pressure, hydrate saturation and strain show one simple pattern during hydrate dissociation，while those of temperature and hydrate dissociation rate manifest four and three complex patterns respectively. The effective hydrate reaction specific area, reaction coefficient and pressure difference play different roles in the domination of the trend and value of hydrate dissociation rate. Additionally, two examples are given to demonstrate the implications of the fundamental mechanism to the engineering. A negative-power-law relation is found between the finish time of hydrate dissociation and the heat transfer coefficient of outside heat source (geothermal heat in real engineering). A good linear relation between hydrate dissociation front and pressure transfer front is found, which provides a possible easy way to predict the range of dissociated hydrate by pressure in the real engineering.

Suggested Citation

  • Zhang, Haitao & Wu, Bisheng & Luo, Xianqi & Tang, Minggao & Zhang, Xuhui & Yang, Liu & Nie, Yuanxun & Zhou, Jiaxing & Zhang, Li & Li, Guangyao, 2024. "Multiphysical evolution and dynamic competition involved in natural gas hydrate dissociation in porous media and its implications for engineering," Energy, Elsevier, vol. 289(C).
    • Handle: RePEc:eee:energy:v:289:y:2024:i:c:s0360544223034266
    DOI: 10.1016/j.energy.2023.130032
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