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Experimental study on the effective thermal conductivity of hydrate-bearing sediments

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  • Yang, Lei
  • Zhao, Jiafei
  • Liu, Weiguo
  • Yang, Mingjun
  • Song, Yongchen

Abstract

Gas hydrates are considered as a potential strategic energy source for sustainable development. The thermal properties of hydrate-bearing sediments govern the hydrate dissociation behavior and gas production process that accompany phase transformation and multiphase flow. This paper presents a thermistor-based measuring method to obtain the effective thermal conductivity of tetrahydrofuran hydrate-bearing sediments. The effects of different porosities, hydrate saturations and porous materials on the effective thermal conductivity were investigated. The porosity and the hydrate saturation were obtained using an X-ray CT (computed tomography) apparatus. The findings indicated that the effective thermal conductivity of hydrate-bearing sediments increased from 0.6468 W/(m K) to 0.7318 W/(m K) with porosity decreasing from 42.5% to 37.2%. Increasing hydrate saturations from 0% to 100% decreased the effective thermal conductivity from 0.7876 W/(m K) to 0.7318 W/(m K). Additionally, existing effective medium correlations were examined using the experimental data. The results showed that none of the existing correlations can suitably predict the measured data. Therefore, a hybrid correlation was proposed by optimizing the weighting parameters of the Parallel correlation and the Series correlation using the PIKAIA genetic algorithm. The agreement of the fitting correlation with the experiments is given, and the effective prediction of other researchers' work confirms the feasibility of our correlation.

Suggested Citation

  • Yang, Lei & Zhao, Jiafei & Liu, Weiguo & Yang, Mingjun & Song, Yongchen, 2015. "Experimental study on the effective thermal conductivity of hydrate-bearing sediments," Energy, Elsevier, vol. 79(C), pages 203-211.
    • Handle: RePEc:eee:energy:v:79:y:2015:i:c:p:203-211
    DOI: 10.1016/j.energy.2014.11.008
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    References listed on IDEAS

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    Cited by:

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    2. Song, Rui & Feng, Xiaoyu & Wang, Yao & Sun, Shuyu & Liu, Jianjun, 2021. "Dissociation and transport modeling of methane hydrate in core-scale sandy sediments: A comparative study," Energy, Elsevier, vol. 221(C).
    3. Chen, Bingbing & Sun, Huiru & Li, Kehan & Yu, Tao & Jiang, Lanlan & Yang, Mingjun & Song, Yongchen, 2023. "Unsaturated water flow-induced the structure variation of gas hydrate reservoir and its effect on fluid migration and gas production," Energy, Elsevier, vol. 282(C).
    4. Yin, Zhenyuan & Zhang, Shuyu & Koh, Shanice & Linga, Praveen, 2020. "Estimation of the thermal conductivity of a heterogeneous CH4-hydrate bearing sample based on particle swarm optimization," Applied Energy, Elsevier, vol. 271(C).
    5. Song, Rui & Sun, Shuyu & Liu, Jianjun & Yang, Chunhe, 2021. "Pore scale modeling on dissociation and transportation of methane hydrate in porous sediments," Energy, Elsevier, vol. 237(C).
    6. Li, Xiao-Yan & Li, Xiao-Sen & Wang, Yi & Liu, Jian-Wu & Hu, Heng-Qi, 2020. "The determining factor of hydrate dissociation rate in the sediments with different water saturations," Energy, Elsevier, vol. 202(C).
    7. Li, Xiao-Yan & Feng, Jing-Chun & Li, Xiao-Sen & Wang, Yi & Hu, Heng-Qi, 2022. "Experimental study of methane hydrate formation and decomposition in the porous medium with different thermal conductivities and grain sizes," Applied Energy, Elsevier, vol. 305(C).
    8. Ohfuka, Yugo & Ohmura, Ryo, 2016. "Theoretical performance analysis of hydrate-based heat engine system suitable for low-temperature driven power generation," Energy, Elsevier, vol. 101(C), pages 27-33.

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