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Investigation into the Effect of Permeable Boundary Sealing on the Behavior of Hydrate Exploitation via Depressurization Combined with Heat Injection

Author

Listed:
  • Yihan Wang

    (Ganzhou Water Limited Company, Ganzhou 341000, China)

  • Yunshuang Zeng

    (Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China)

  • Xiuping Zhong

    (Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, College of Construction Engineering, Jilin University, Changchun 130026, China)

  • Dongbin Pan

    (Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, College of Construction Engineering, Jilin University, Changchun 130026, China)

  • Chen Chen

    (Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, College of Construction Engineering, Jilin University, Changchun 130026, China)

Abstract

Depressurization combined with heat (mainly hot water) injection is an important technique for exploiting natural gas hydrate (NGH). To overcome the problems of pore water intrusion and hot water energy loss in the technique, this paper employs a method of setting sealing boundaries in permeable overburden and underburden to exploit NGH. The influence of the presence of sealing boundaries on NGH exploitation performances was numerically investigated. The results indicate that the sealing boundaries in permeable overburden and underburden can inhibit water intrusion and reduce heat loss, significantly improving the efficiency of hydrate dissociation and gas production. Specifically, the hydrate dissociation and gas production efficiency increased by 22.0–30.1% and 63.9–85.1%, respectively. Moreover, there is an optimal sealing vertical distance within the range of 0–15 m, maximizing the mining efficiency of NGH at the end of production. On the other hand, the presence of sealing boundaries effectively limits the escape range of CH 4 in the permeable overburden and underburden, resulting in an increasing gas-to-water ratio and an increasing energy efficiency. These findings provide theoretical and technical support for the mining of NGH by depressurization combined with heat injection.

Suggested Citation

  • Yihan Wang & Yunshuang Zeng & Xiuping Zhong & Dongbin Pan & Chen Chen, 2024. "Investigation into the Effect of Permeable Boundary Sealing on the Behavior of Hydrate Exploitation via Depressurization Combined with Heat Injection," Energies, MDPI, vol. 17(20), pages 1-22, October.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:20:p:5172-:d:1500816
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    References listed on IDEAS

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    2. Yin, Zhenyuan & Moridis, George & Chong, Zheng Rong & Tan, Hoon Kiang & Linga, Praveen, 2018. "Numerical analysis of experimental studies of methane hydrate dissociation induced by depressurization in a sandy porous medium," Applied Energy, Elsevier, vol. 230(C), pages 444-459.
    3. Chong, Zheng Rong & Yang, She Hern Bryan & Babu, Ponnivalavan & Linga, Praveen & Li, Xiao-Sen, 2016. "Review of natural gas hydrates as an energy resource: Prospects and challenges," Applied Energy, Elsevier, vol. 162(C), pages 1633-1652.
    4. Oleg Bazaluk & Kateryna Sai & Vasyl Lozynskyi & Mykhailo Petlovanyi & Pavlo Saik, 2021. "Research into Dissociation Zones of Gas Hydrate Deposits with a Heterogeneous Structure in the Black Sea," Energies, MDPI, vol. 14(5), pages 1-24, March.
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