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Numerical simulation of gas production from permafrost hydrate deposits enhanced with CO2/N2 injection

Author

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  • Kan, Jing-Yu
  • Sun, Yi-Fei
  • Dong, Bao-Can
  • Yuan, Qing
  • Liu, Bei
  • Sun, Chang-Yu
  • Chen, Guang-Jin

Abstract

A new numerical simulator was developed from the widely used CH4 hydrate simulator TOUGH + HYDRATE to realize the simulation of hydrate exploitation by CO2/N2–CH4 replacement. Focusing on actual hydrate reservoir, CO2/N2 injection combined with depressurization in a practical continuous injection-production mode was applied for gas production. The influence of feed gas composition and injection pressure on CO2 sequestration and CH4 production was investigated. Moreover, we conducted a fair comparison and revealed the advantages of CO2/N2 injection over two traditional methods in gas/water production performance. During gas injection, a continuous CO2/N2 separation process under stratum environment was observed, and the whole gas replacement process can be roughly summarized as a continuous cycle of CH4 hydrate dissociation and CO2/N2 hydrate formation. Increasing N2 mole fraction from 30% to 50% significantly enhanced the CH4 production efficiency, while its increase from 50% to 100% mainly resulted in more N2 production and higher injection-production ratio. Raising the injection pressure from 4.5 to 5 MPa improved CH4 recovery by 1.5 times, while increase from 5 to 7 MPa reduced CH4 recovery by 8.3%. A favorable CH4 recovery with relatively low cost can be achieved by finding an appropriate balance between CH4 release and CO2 sequestration.

Suggested Citation

  • Kan, Jing-Yu & Sun, Yi-Fei & Dong, Bao-Can & Yuan, Qing & Liu, Bei & Sun, Chang-Yu & Chen, Guang-Jin, 2021. "Numerical simulation of gas production from permafrost hydrate deposits enhanced with CO2/N2 injection," Energy, Elsevier, vol. 221(C).
    • Handle: RePEc:eee:energy:v:221:y:2021:i:c:s0360544221001687
    DOI: 10.1016/j.energy.2021.119919
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    Cited by:

    1. Kuang, Yangmin & Zhang, Lunxiang & Zheng, Yanpeng, 2022. "Enhanced CO2 sequestration based on hydrate technology with pressure oscillation in porous medium using NMR," Energy, Elsevier, vol. 252(C).
    2. Chen, Xuejun & Lu, Hailong & Gu, Lijuan & Shang, Shilong & Zhang, Yi & Huang, Xin & Zhang, Le, 2022. "Preliminary evaluation of the economic potential of the technologies for gas hydrate exploitation," Energy, Elsevier, vol. 243(C).
    3. Jiang, Wei & Kan, Jingyu & Dong, Baocan & Li, Xingxun & Wang, Xiaohui & Deng, Chun & Liu, Bei & Li, Qingping & Sun, Changyu & Chen, Guangjin, 2023. "Natural gas hydrate exploitation and recovered natural gas liquefaction driven by wind power: Process modelling and energy performance evaluation," Energy, Elsevier, vol. 282(C).
    4. Bai, Yang & Lin, Hai-Fei & Li, Shu-Gang & Long, Hang & Yan, Min & Li, Yong & Qin, Lei & Zhou, Bin, 2022. "Experimental study on kinetic characteristics of gas diffusion in coal under nitrogen injection," Energy, Elsevier, vol. 254(PA).
    5. Dong, Bao-Can & Xiao, Peng & Sun, Yi-Fei & Kan, Jing-Yu & Yang, Ming-Ke & Peng, Xiao-Wan & Sun, Chang-Yu & Chen, Guang-Jin, 2022. "Coupled flow and geomechanical analysis for gas production from marine heterogeneous hydrate-bearing sediments," Energy, Elsevier, vol. 255(C).
    6. Xue, Kunpeng & Liu, Yu & Yu, Tao & Yang, Lei & Zhao, Jiafei & Song, Yongchen, 2023. "Numerical simulation of gas hydrate production in shenhu area using depressurization: The effect of reservoir permeability heterogeneity," Energy, Elsevier, vol. 271(C).
    7. Wang, Xiao-Hui & Chen, Yun & Li, Xing-Xun & Xu, Qiang & Kan, Jing-Yu & Sun, Chang-Yu & Chen, Guang-Jin, 2021. "An exergy-based energy efficiency analysis on gas production from gas hydrates reservoir by brine stimulation combined depressurization method," Energy, Elsevier, vol. 231(C).

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