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本文建立了一套长细砂管物理模拟系统,在长细管物理模型不同位置上布置多个测压取样点,通过实时测量压力变化与采集样品检测化学剂浓度变化,研究三元复合驱化学剂在多孔介质中传质规律和浓度变化特征.从模型进口到模型出口,化学剂浓度都是逐渐下降的,在驱替前沿上升速度快,在驱替后沿降低速度缓慢,化学剂浓度变化是非对称、有偏移的变化过程.化学剂的运移速度由大到小分别是聚合物、碱和表面活性剂,在模型进口附近化学剂的运移滞后和综合扩散强,化学剂的运移速度快,3种化学剂之间的运移速度差大,化学剂的色谱分离明显.在模型出口附近化学剂的运移滞后和综合扩散减弱,化学剂浓度降低,运移速度小,运移速度差变小,化学剂的色谱分离现象变弱.化学剂的吸附滞留率随着距离是逐渐增加的,聚合物吸附滞留最严重.
In this paper, a set of long-fine sand tube physics simulation system was established. A number of pressure-measuring sampling points were arranged on different positions of the long-slim tube physical model. The change of concentration and the change of chemical concentration were measured by real- The mass transfer law and concentration variation in porous media from the model inlet to the model outlet, the concentration of chemical agent is gradually decreased, the rising speed is fast at the displacement front, the slowing down velocity at the back of the displacement, the change of the chemical concentration Is asymmetric, there is a shift in the process of migration of chemical migration speed from large to small are polymer, alkali and surfactant, in the vicinity of the entrance of the chemical migration of chemical agents and comprehensive diffusion strong, chemical agents shipped The migration velocity is fast, the transport velocity difference between the three chemical agents is large, and the chromatographic separation of the chemical agents is obvious. The transport lag and comprehensive diffusion of the chemical agents are weakened near the exit of the model, the concentration of the chemical agent is reduced, the migration speed is small, The difference of moving speed becomes smaller, and the phenomenon of chromatographic separation of chemical agents becomes weaker.The adsorption retention rate of chemical agent gradually increases with the distance, and the polymer adsorbs and retains the most serious.