CO_2置换开采天然气水合物相图分析及数值模拟

Phase Diagram Analysis and Dynamics Simulation on Replacement of Natural Gas Hydrate with CO_2

将CO2和CH4的水合相图和赋存区地温地压线结合起来分析,对天然气水合物的CO2置换开采是非常必要的。通过分析发现,无论是在海底还是永久冻土带的多孔介质中,由CO2和CH4的水合相平衡曲线及CO2的气液相平衡曲线所围成的区域就是适合置换开采的温度压力条件范围。

It is necessary for the replacement of CH4 in hydrate with CO2 to combine their hydrate phase diagrams with the geothermal pres-sure line of porous media and to analyze it .It can be found that ,either in deep seabed or in permafrost ,the area surrounded by the phase diagrams of CH4 -hydrate and CO2 -hydrate and the vapor -liquid equilibrium line of CO2 is the appropriate region of replacement .