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Analyzing the process of gas production for natural gas hydrate using depressurization

Author

Listed:
  • Zhao, Jiafei
  • Zhu, Zihao
  • Song, Yongchen
  • Liu, Weiguo
  • Zhang, Yi
  • Wang, Dayong

Abstract

Natural gas hydrate is a vast energy resource with global distribution in permafrost regions and in the oceans; its sheer volume demands that it be evaluated as a potential energy source. Understanding the mechanisms of natural gas extraction from hydrate-bearing sediments is critical for the utilization of hydrate accumulations. In this work, methane hydrate dissociation was performed in three kinds of porous media at production pressures of 2.2MPa, 2.6MPa, and 3.0MPa. Results show that the methane gas production process can be divided into three main stages: free gas liberation, hydrate dissociation sustained by the sensible heat of the reservoir, and hydrate dissociation driven by ambient heat transfer. In the process of gas production, hydrate dissociation occurs simultaneously throughout the hydrate zone along the phase equilibrium curve, and then spreads radially from the outside as a result of ambient heat transfer. Hydrate reformation and ice generation always occur in the reservoir interior due to insufficient heat transfer. The use of porous media with increased thermal conductivity accelerates the gas production rate; however, it has little influence on the final percentage of gas production. Furthermore, the Stefan (Ste) number and dissociation rate constant were employed to evaluate the impact of the sensible heat of the reservoir and ambient heat transfer. Results indicate that the sensible heat of the reservoir and ambient heat transfer play a dominant role in hydrate dissociation, and that both are dependent on production pressures.

Suggested Citation

  • Zhao, Jiafei & Zhu, Zihao & Song, Yongchen & Liu, Weiguo & Zhang, Yi & Wang, Dayong, 2015. "Analyzing the process of gas production for natural gas hydrate using depressurization," Applied Energy, Elsevier, vol. 142(C), pages 125-134.
  • Handle: RePEc:eee:appene:v:142:y:2015:i:c:p:125-134
    DOI: 10.1016/j.apenergy.2014.12.071
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    References listed on IDEAS

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    1. Li, Xiao-Sen & Yang, Bo & Zhang, Yu & Li, Gang & Duan, Li-Ping & Wang, Yi & Chen, Zhao-Yang & Huang, Ning-Sheng & Wu, Hui-Jie, 2012. "Experimental investigation into gas production from methane hydrate in sediment by depressurization in a novel pilot-scale hydrate simulator," Applied Energy, Elsevier, vol. 93(C), pages 722-732.
    2. E. Dendy Sloan, 2003. "Fundamental principles and applications of natural gas hydrates," Nature, Nature, vol. 426(6964), pages 353-359, November.
    3. Jiafei Zhao & Chuanxiao Cheng & Yongchen Song & Weiguo Liu & Yu Liu & Kaihua Xue & Zihao Zhu & Zhi Yang & Dayong Wang & Mingjun Yang, 2012. "Heat Transfer Analysis of Methane Hydrate Sediment Dissociation in a Closed Reactor by a Thermal Method," Energies, MDPI, vol. 5(5), pages 1-17, May.
    4. Li, Bo & Li, Xiao-Sen & Li, Gang & Feng, Jing-Chun & Wang, Yi, 2014. "Depressurization induced gas production from hydrate deposits with low gas saturation in a pilot-scale hydrate simulator," Applied Energy, Elsevier, vol. 129(C), pages 274-286.
    5. Wang, Yi & Li, Xiao-Sen & Li, Gang & Zhang, Yu & Li, Bo & Feng, Jing-Chun, 2013. "A three-dimensional study on methane hydrate decomposition with different methods using five-spot well," Applied Energy, Elsevier, vol. 112(C), pages 83-92.
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