论文部分内容阅读
利用自主研发的THM三场耦合渗流实验系统,进行不同孔隙压力和温度条件下的超临界CO2在低渗透煤层中的渗流实验,得出不同温度下流速和压力梯度之间的关系,从而得到了低渗透煤层注入超临界CO2的非达西渗流规律,即流速与压力梯度变化规律呈现正指数关系。随着压力梯度的增大,渗透系数也不断的增大,且呈现正指数关系;在同一体积应力和压力梯度的条件下,温度越高,流速越快;温度在临界点附近,流速和渗透系数增加很快。
Using THM three-field coupled seepage experiment system independently developed, the seepage experiment of supercritical CO2 in low permeability coal seam under different pore pressures and temperatures was carried out, and the relationship between flow velocity and pressure gradient at different temperatures was obtained. Non-Darcy flow law of low permeability coal seam injected into supercritical CO2, that is, the relationship between flow rate and pressure gradient shows a positive exponential relationship. With the increase of pressure gradient, the permeability coefficient also increases continuously, and shows a positive exponential relationship; under the same volume stress and pressure gradient, the higher the temperature, the faster the flow rate; the temperature is near the critical point, the flow rate and permeation The coefficient increases quickly.