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Evolution of Hydrate Dissociation by Warm Brine Stimulation Combined Depressurization in the South China Sea

Author

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  • Jing-Chun Feng

    (Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
    University of Chinese Academy of Sciences, Beijing 100083, China)

  • Gang Li

    (Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China)

  • Xiao-Sen Li

    (Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China)

  • Bo Li

    (Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
    University of Chinese Academy of Sciences, Beijing 100083, China)

  • Zhao-Yang Chen

    (Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China)

Abstract

To evaluate the gas production performance of the hydrate accumulations in the South China Sea, a numerical simulation with warm brine stimulation combined depressurization has been conducted. A dual horizontal well system is considered as the well configuration in this work. In order to reduce energy input and improve energy utilization, warm brine (<30 °C) instead of hot brine (>50 °C) is injected into the reservoir for hydrate dissociation. The effect of the intrinsic permeability of the hydrate reservoir, the salinity and the temperature of the injected brine to gas hydrate exploitation have been investigated. The numerical simulation results indicate that the average gas production rate Q avg is about 1.23 ´ 10 5 ST m 3 /day for the entire hydrate deposit, which has the same order of magnitude compared with the commercially viable production rate. The injected brine can be pumped out from the upper production well directly after the hydrate between the two wells is dissociated completely. Thus, the effective region of heat and inhibitor stimulation is limited. The sensitivity analyses indicate that the dissociation rate of hydrate can be enhanced by increasing the temperature of the injected brine and raising the salinity of the injected brine. The parametric study of permeability shows that the hydrate of the reservoir with the larger permeability has a higher dissociation rate.

Suggested Citation

  • Jing-Chun Feng & Gang Li & Xiao-Sen Li & Bo Li & Zhao-Yang Chen, 2013. "Evolution of Hydrate Dissociation by Warm Brine Stimulation Combined Depressurization in the South China Sea," Energies, MDPI, vol. 6(10), pages 1-24, October.
  • Handle: RePEc:gam:jeners:v:6:y:2013:i:10:p:5402-5425:d:29704
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    6. Feng, Jing-Chun & Wang, Yi & Li, Xiao-Sen & Li, Gang & Chen, Zhao-Yang, 2015. "Production behaviors and heat transfer characteristics of methane hydrate dissociation by depressurization in conjunction with warm water stimulation with dual horizontal wells," Energy, Elsevier, vol. 79(C), pages 315-324.
    7. Vedachalam, N. & Ramesh, S. & Srinivasalu, S. & Rajendran, G. & Ramadass, G.A. & Atmanand, M.A., 2016. "Assessment of methane gas production from Indian gas hydrate petroleum systems," Applied Energy, Elsevier, vol. 168(C), pages 649-660.
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    10. Zhong, Xiuping & Pan, Dongbin & Zhu, Ying & Wang, Yafei & Zhai, Lianghao & Li, Xitong & Tu, Guigang & Chen, Chen, 2021. "Fracture network stimulation effect on hydrate development by depressurization combined with thermal stimulation using injection-production well patterns," Energy, Elsevier, vol. 228(C).
    11. Tang, Jizhou & Zhang, Min & Guo, Xuyang & Geng, Jianhua & Li, Yuwei, 2024. "Investigation of creep and transport mechanisms of CO2 fracturing within natural gas hydrates," Energy, Elsevier, vol. 300(C).
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    18. Jing-Chun Feng & Xiao-Sen Li & Gang Li & Bo Li & Zhao-Yang Chen & Yi Wang, 2014. "Numerical Investigation of Hydrate Dissociation Performance in the South China Sea with Different Horizontal Well Configurations," Energies, MDPI, vol. 7(8), pages 1-22, July.

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