The effects of compressibility of natural gas hydrate-bearing sediments on gas production using depressurization
The effects of compressibility of natural gas hydrate-bearing sediments on gas production using depressurization
复制标题
含天然气水合物沉积物的压缩性对减压采气的影响
DOI：
10.1016/j.energy.2019.07.108
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发表时间：
2019-10
期刊：
影响因子：
9
通讯作者：
Yongchen Song
中科院分区：
文献类型：
--
作者：
Xiang Sun;Yanghui Li;Yu Liu;Yongchen Song
天然气水合物是近年来引起全球关注的新型替代能源。降压是从含天然气水合物沉积物中开采天然气的基本方法。然而，卸压过程中的土壤压实是生产效率和安全的重要问题。土壤的压缩性在传热、流体流动和土壤压实的耦合过程中影响水合物的分解。在这项研究中，一个完全耦合的热-水-化学-力学（THCM）模型被应用于模拟增田的核心规模的气体生产实验。通过改变控制压缩性的参数，包括主体沉积物的体积模量和水合物增强的体积模量，压缩性对产气率，孔隙压力，温度，水合物饱和度，渗透率和热导率的变化的影响进行了研究。结果表明，更高的压缩性对应于更大的孔隙度减少，进一步影响有效渗透率，导热系数和降压过程中的热对流的变化。在增田的试验中，压力的变化表明，土壤压实可能发生在减压过程中。由于真实的现场生产是在封闭条件下进行的，因此需要发展增田试验来考虑GHBS的压缩性。
Natural gas hydrate is a new alternative energy that has attracted global attention in recent years. Depressurization is considered a fundamental method of producing natural gas from gas hydrate-bearing sediments (GHBSs). However, soil compaction during depressurization is a significant problem for production efficiency and safety. The compressibility of soil affects the hydrate dissociation in the coupled process of heat transfer, fluid flow, and soil compaction. In this study, a fully coupled Thermo-hydro-chemo-mechanical (THCM) model is applied to simulate Masuda's core-scale gas production experiments. The effects of compressibility on the changes in gas production rate, pore pressure, temperature, hydrate saturation, permeability, and heat conductivity are investigated by varying the parameters governing compressibility including the bulk modulus of host sediments and hydrate-enhanced bulk modulus. The results show that the higher compressibility corresponds to a larger reduction in porosity further impacting the variation in effective permeability, heat conductivity, and heat convection during depressurization. In Masuda's test, the pressure changes indicate that the soil compaction might occurs during depressurization. Because the real field production is implemented under confining condition, Masuda's test should be developed to consider the compressibility of GHBSs.
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DOI：
10.1190/1.9781560802197.ch26
发表时间：
2008
期刊：
--
影响因子：
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作者：
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通讯作者：
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影响因子：
9
作者：
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影响因子：
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DOI：
10.1002/nag.2527
发表时间：
2016-11
影响因子：
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作者：
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T. Akaki;S. Kimoto;F. Oka