A comparative analysis of the mechanical behavior of carbon dioxide and methane hydrate-bearing sediments
A comparative analysis of the mechanical behavior of carbon dioxide and methane hydrate-bearing sediments
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DOI：
10.2138/am.2014.4620
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发表时间：
2014
影响因子：
3.1
通讯作者：
M. Hyodo;Yanghui Li;J. Yoneda;Y. Nakata;N. Yoshimoto;S. Kajiyama;A. Nishimura;Yongchen Song
中科院分区：
文献类型：
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作者：
M. Hyodo;Yanghui Li;J. Yoneda;Y. Nakata;N. Yoshimoto;S. Kajiyama;A. Nishimura;Yongchen Song
摘要了解含二氧化碳/甲烷水合物沉积物的力学行为，对于评价二氧化碳驱采方法从水合物储集层生产甲烷的可行性是至关重要的。在本研究中，对合成二氧化碳水合物沉积物在不同条件下进行了一系列排水三轴压缩试验。并对含二氧化碳和甲烷水合物的沉积物进行了对比分析。研究了水合物的应力-应变曲线、剪切强度以及水合物饱和度、有效围压和温度对力学行为的影响。实验结果表明，当CH4-CO2气体在相对较短的时间内发生交换时，新形成的二氧化碳水合物将保持储集层的力学稳定，并且在空间上分布均匀。在含甲烷水合物的沉积物中注入二氧化碳的实验是必要的，以证实这一假设。
Abstract Understanding the mechanical behaviors of carbon dioxide/methane hydrate-bearing sediments is essential for assessing the feasibility of CO2 displacement recovery methods to produce methane from hydrate reservoirs. In this study, a series of drained triaxial compression tests were conducted on synthetic carbon dioxide hydrate-bearing sediments under various conditions. A comparative analysis was also made between carbon dioxide and methane hydrate-bearing sediments. The stress-strain curves, shear strength, and the effects of hydrate saturation, effective confining stress, and temperature on the mechanical behaviors were investigated. Our experimental results indicate that the newly formed carbon dioxide hydrate would keep the reservoir mechanically stable when CH4-CO2 gas exchange took place in a relatively short period of time and spatially well distributed in the pore space. Experiments of CO2 injection in methane hydrate-bearing sediments are necessary to confirm this hypothesis.