Studies of Reaction Kinetics of Methane Hydrate Dissocation in Porous Media
Studies of Reaction Kinetics of Methane Hydrate Dissocation in Porous Media
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发表时间：
2005-03
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通讯作者：
G. Moridis;Y. Seol;Timothy J Kneafsey
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作者：
G. Moridis;Y. Seol;Timothy J Kneafsey
本研究的目的是描述多孔介质中甲烷水合物的分解动力学，并确定相应的动力学参数。水合物的动力学分解行为的知识可以发挥关键作用的天然气水合物聚集在地质介质中的产气潜力的评估。我们分析了数据从一系列的测试CH4水合物分解通过热刺激。这些测试是在部分被水、水合物和CH4气体饱和的砂芯上进行的，并包含在X射线透明的铝制压力容器中。测量了压力、释放气体的体积和温度（在岩心内的几个位置）。为了避免将局部变化误解为全局过程，X射线计算机断层扫描提供了实验过程中反应界面位置和运动的准确图像。通过逆建模（历史匹配）的数据分析提供的热性能和多孔介质中的水化反应的动力学参数的估计。从水合物轴承多孔介质核心的结果，从纯甲烷水合物样品的比较提供了一个衡量多孔介质的动力学反应的效果。并提出了水合物介质复合导热系数的初步模型。
The objective of this study is the description of the kinetic dissociation of CH4-hydrates in porous media, and the determination of the corresponding kinetic parameters. Knowledge of the kinetic dissociation behavior of hydrates can play a critical role in the evaluation of gas production potential of gas hydrate accumulations in geologic media. We analyzed data from a sequence of tests of CH4-hydrate dissociation by means of thermal stimulation. These tests had been conducted on sand cores partially saturated with water, hydrate and CH4 gas, and contained in an x-ray-transparent aluminum pressure vessel. The pressure, volume of released gas, and temperature (at several locations within the cores) were measured. To avoid misinterpreting local changes as global processes, x-ray computed tomography scans provided accurate images of the location and movement of the reaction interface during the course of the experiments. Analysis of the data by means of inverse modeling (history matching ) provided estimates of the thermal properties and of the kinetic parameters of the hydration reaction in porous media. Comparison of the results from the hydrate-bearing porous media cores to those from pure CH4-hydrate samples provided a measure of the effect of the porous medium on the kinetic reaction. A tentative model of composite thermal conductivity of hydrate-bearing media was also developed.