多段冷却诱导砂质介质中ch -水合物形成的动力学行为

Zhenyuan Yin, G. Moridis, Z. Chong, Praveen Linga
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引用次数: 0

摘要

甲烷水合物因其巨大的资源量和有效储存甲烷的能力而被认为是未来的清洁能源。由于天然MH岩心的稀缺,在实验室中合成含氢样品以分析其热物理/地质力学性质和形成/解离行为具有重要意义。为了使含氢试样达到最大的均匀性,我们设计了一个三阶段的冷却过程来诱导砂质介质中过量水条件下的MH形成。实验测量的P和T用于基于孔隙体积平衡法估计所有相(水、气和水合物)随时间的相饱和度。在没有直接可视化能力的情况下,我们进一步通过数值模拟对实验结果进行分析,得出了样品中各相的空间分布。非均质性是由于反应器的不完全绝缘导致热从周围流入。我们得出的结论是,在实验室中制造均匀的含氢样品极具挑战性,可能是不可能的。我们的研究结果为MH在优先位置的形成提供了解释,并揭示了实验装置或冷却过程(增加冷却步骤和延长冷却时间)的替代创新设计,以产生均匀的含MH岩心样品。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kinetic Behavior of CH-Hydrate Formation in a Sandy Medium Induced by a Multi-Stage Cooling Process
Methane hydrates (MHs) have been considered as the future clean energy resource because of the vast resource volume and the capability to store methane effectively. To synthesize MH-bearing samples in laboratory for analysis of the thermophysical/geomechanical properties and the formation/dissociation behavior is important because of the scarcity of obtaining naturally-occurring MH cores. With the aim to achieve maximum uniformity in the MH-bearing samples, we designed experiment involving a three- stage cooling process to induce MH formation in the sandy medium under an excess-water condition. The experimental measured P and T were used to estimate the phase saturations of all phases (aqueous, gas and hydrate) over time based on a pore-volume balance method. In the absence of direct visualization capability, we further analyzed the experimental results through numerical simulation to derive the spatial distributions of all phases in the sample. Heterogeneity was identified because of the heat inflow from the surrounding resulting from the imperfect insulation of the reactor. We reached the conclusion that creating homogeneous MH-bearing samples in laboratory is extremely challenging and may not be possible. Our results offer explanations for MH formation at preferential locations and shed light on alternative innovative designs of experimental apparatus or cooling processes (with increased number of cooling steps and longer duration) to create uniform MH-bearing core samples.
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