Zhao Jiafei, Lv Qin, Li Yanghui, Yang Mingjun, Liu Weiguo, Yao Lei, Wang Shenglong, Zhang Yi, Song Yongchen
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, PR China.
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, PR China.
Magn Reson Imaging. 2015 May;33(4):485-90. doi: 10.1016/j.mri.2014.12.010. Epub 2014 Dec 16.
In this work, magnetic resonance imaging (MRI) was employed to observe the in-situ formation and dissociation of methane hydrates in porous media. Methane hydrate was formed in a high-pressure cell with controlled temperature, and then the hydrate was dissociated by thermal injection. The process was photographed by the MRI, and the pressure was recorded. The images confirmed that the direct visual observation was achieved; these were then employed to provide detailed information of the nucleation, growth, and decomposition of the hydrate. Moreover, the saturation of methane hydrate during the dissociation was obtained from the MRI intensity data. Our results showed that the hydrate saturation initially decreased rapidly, and then slowed down; this finding is in line with predictions based only on pressure. The study clearly showed that MRI is a useful technique to investigate the process of methane hydrate formation and dissociation in porous media.
在这项工作中，采用磁共振成像（MRI）来观察多孔介质中甲烷水合物的原位形成和解离过程。甲烷水合物在温度可控的高压容器中形成，然后通过热注入使水合物分解。该过程由MRI进行拍摄，并记录压力。图像证实实现了直接视觉观察；这些图像随后被用于提供水合物成核、生长和分解的详细信息。此外，从MRI强度数据中获得了解离过程中甲烷水合物的饱和度。我们的结果表明，水合物饱和度最初迅速下降，然后减缓；这一发现与仅基于压力的预测相符。该研究清楚地表明，MRI是研究多孔介质中甲烷水合物形成和解离过程的一种有用技术。
