【摘要】 利用异丙醇(isopropanol,IPA)和水对高黏度的流体驱替低黏度的流体和低黏度的流体驱替高黏度的流体两种混相驱替模式进行试验,研究流速和驱替模式对于混相流动和弥散系数的影响。结果表明:在IPA驱水的过程中,驱替的界面平稳而整齐,驱替的速度较低时,IPA突破较早,IPA质量分数达到1.0时所需注入的体积较少,效率高;在水驱替IPA的过程中,当水的流动速度较小时突破也较早,纯水时所需注入的体积较少,效率高;用低黏度流体驱替高黏度流体时,驱替发生"拖尾",黏性指进比高黏度的流体驱替低黏度流体的过程中严重;弥散系数与平均速度成正比,其比例系数与孔隙介质的结构和驱替类型相关,同一介质低黏度驱替高黏度流体时,其比例系数较大。更多还原

【Abstract】 The effects of velocity and displacing patterns on fluid flows and the dispersion coefficients were experimentally studied in the cases of the more viscous fluid(isopropanol,IPA) displacing less viscous fluid(water) and water displacing IPA in sandstone samples.The results show that in the case of IPA displacing water,advancing fronts are stable and smooth.The IPA breakthrough occurs earlier and the volume required to achieve the complete displacement is less or displacement efficiency is higher when the displacing velocity is lower.In the case of water displacing IPA,the breakthrough and the displacement efficiency are similar to that in the case of IPA displacing water,but unstable fronts appear.Trailing phenomena were observed in the case of water displacing IPA.It implies that less viscous fluid displacing more viscous fluid could have relatively lower displacement efficiency.The dispersion coefficient is generally proportional to the average flow velocity,while the proportional factors rely on both the pore structure and the displacing patterns.The dispersion coefficients are higher in the case of displacing more viscous fluid in the same porous media.更多还原