复杂化学流体在多孔介质中的传质

化学驱油技术已从单一化学剂驱油发展到了复杂化学流体复合体系驱油。化学驱油过程中存在扩散、弥散、吸附、滞留、化学反应等一系列物理化学作用，影响化学剂在多孔介质中的传质过程。碱水驱油实验证明了单一化学剂在多孔介质中存在运移滞后；文中分析了上述物理化学作用，研究了复合体系各种化学剂的运移滞后及滞后差，指出综合吸附作用引起化学剂运移滞后，不同化学剂的运移滞后差导致色谱分离现象。在上述研究的基础上，提出 了吸附对流扩散方程，得到了解析解。并用该解析解处理实验资料，求出了方程中化学剂运移滞后系数和综合扩散系数等相应的参数，可描述和预测复杂化学流体在多孔介质中的传质过程。

MASS TRANSFER OF COMPLEX CHEMICAL FLUID IN POROUS MEDIA

With the development of EOR (enhanced oil recovery) technology, chemical flooding technique has been switched from single chemical agent to complex chemical fluid to displace oil. In chemical flooding process, there exist a series of physical-chemical phenomena, such as: diffusion, dispersion, adsorption, retention, and chemical reaction etc. These phenomena will affect mass transfer of chemical agents in porous media. In this paper, the above physical-chemical phenomena are analyzed. It is proved by alkali aqueous solution displacing oil experiments that there exists motion lag for a single chemical agent when it is transferred in porous media. The motion lag and lag-difference for alkaline/surfactant/polymer complex system porous flow were also investigated, results show that the all-around adsorption will lead to motion lag. The lag-difference for different chemical agents lead to chromatographic separation phenomena'. Based on the above work, a adsorptive-convective-diffusive equation is established, and its analytical solution is obtained. Experimental data are treated by using this solution, and the lag coefficient and all-around diffusive coefficient in the equation were extracted, with these results, the mass transfer process for complex chemical fluid can be described and predicted.