石英沙中甲烷水合物的降压分解实验研究

为了解自然赋存条件下天然气水合物的分解性质,本研究在20～40目石英砂中进行了甲烷水合物降压分解实验。实验表明,与温度及压力一样,电阻是甲烷水合物形成和分解良好的指示参数。当水合物形成,电阻快速增大;水合物分解时电阻快速减小。实验研究表明,与注热水分解相比,降压分解速率要小得多。同时当采取密闭的分解方式时,随着分解的进行分解速率逐渐变小。由形成/分解体系的物料衡算及反应速率方程可以得出分解速率常数值。

Experimental Research on the Decomposition of Methane Hydrate by Depressurization in Quartz Sands

In order to understanding the decomposition behaviors of natural gas hydrate in situ,the experiments of methane hydrate decomposition by depressurization in quartz sands of 40 to 20 mesh were carried out.It was showed that electrical resistance,like temperature and pressure,is an excellent indication index for the formation and decomposition of methane hydrate The resistance augments apparently with the formation of hydrate,and decreases sharply when the hydrate is decomposing.Compared with that by injecting heat water,the rate of decomposition by depressurization is very low and the rate is lower and lower as the decomposition continued.By the way of material balance of the formation/decomposition system and the equation of reaction rate,the rate constant,Kde,was obtained.