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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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