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Methane hydrate re-formation and blockage mechanism in a pore-level water-gas flow process

Author

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  • Sun, Huiru
  • Chen, Bingbing
  • Li, Kehan
  • Song, Yongchen
  • Yang, Mingjun
  • Jiang, Lanlan
  • Yan, Jinyue

Abstract

Hydrate re-formation increases blockage risk and further reduces gas production efficiency. Considering the huge water production and gas migration, it is essential to determine the key parameters that control hydrate re-formation and blockage in the two-phase flow process. However, little research reveals the mechanism of hydrate re-formation in the water-dominated two-phase flow system. In this study, two-phase flow in hydrate sediment is simulated by controlling the water-gas flow rate, and the effect of effective sectional velocity on hydrate re-formation characteristics is analyzed. The experimental results showed that temperature and pressure followed a three-stage change trend in the water-dominated two-phase flow process: including hydrate re-formation induction stage I, mass hydrate re-formation and agglomeration stage II, and pore gas consumption stage III. Moreover, a lower effective sectional velocity of water (WESV) would reduce the gas concentration gradient between water and hydrate to enhance the hydrate re-formation process. Meanwhile, the gas phase impeded the mass transfer on the water-hydrate interface and acted as the nucleation site to promote hydrate re-formation. Furthermore, it was noticed that the relationship between the onset time of flow blockage and WESV was linearly positive, however, the amount of hydrate re-formation reduced with increasing WESV.

Suggested Citation

  • Sun, Huiru & Chen, Bingbing & Li, Kehan & Song, Yongchen & Yang, Mingjun & Jiang, Lanlan & Yan, Jinyue, 2023. "Methane hydrate re-formation and blockage mechanism in a pore-level water-gas flow process," Energy, Elsevier, vol. 263(PC).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pc:s0360544222027372
    DOI: 10.1016/j.energy.2022.125851
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    References listed on IDEAS

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    1. Chen, Bingbing & Sun, Huiru & Zheng, Junjie & Yang, Mingjun, 2020. "New insights on water-gas flow and hydrate decomposition behaviors in natural gas hydrates deposits with various saturations," Applied Energy, Elsevier, vol. 259(C).
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    Cited by:

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    2. Liu, Weiguo & Song, Qi & Wu, Peng & Liu, Tao & Huang, Lei & Zhang, Shuheng & Li, Yanghui, 2023. "Triaxial tests on anisotropic consolidated methane hydrate-bearing clayey-silty sediments of the South China Sea," Energy, Elsevier, vol. 284(C).
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    4. Wu, Peng & Li, Yanghui & Yu, Tao & Wu, Zhaoran & Huang, Lei & Wang, Haijun & Song, Yongchen, 2023. "Microstructure evolution and dynamic permeability anisotropy during hydrate dissociation in sediment under stress state," Energy, Elsevier, vol. 263(PE).
    5. Cheng, Fanbao & Sun, Xiang & Li, Yanghui & Ju, Xin & Yang, Yaobin & Liu, Xuanji & Liu, Weiguo & Yang, Mingjun & Song, Yongchen, 2023. "Numerical analysis of coupled thermal-hydro-chemo-mechanical (THCM) behavior to joint production of marine gas hydrate and shallow gas," Energy, Elsevier, vol. 281(C).
    6. Cheng, Zucheng & Sun, Lintao & Liu, Yingying & Xu, Huazheng & Jiang, Lanlan & Wang, Lei & Song, Yongchen, 2023. "Multiscale analysis of the effect of the structural transformation of TBAB semi-clathrate hydrate on CO2 capture efficiency," Energy, Elsevier, vol. 280(C).
    7. Dong, Shuang & Yang, Mingjun & Zhang, Lei & Zheng, Jia-nan & Song, Yongchen, 2023. "Methane hydrate exploitation characteristics and thermodynamic non-equilibrium mechanisms by long depressurization method," Energy, Elsevier, vol. 280(C).
    8. Li, Yanghui & Wang, Le & Xie, Yao & Wu, Peng & Liu, Tao & Huang, Lei & Zhang, Shuheng & Song, Yongchen, 2023. "Deformation characteristics of methane hydrate-bearing clayey and sandy sediments during depressurization dissociation," Energy, Elsevier, vol. 275(C).

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