基于电场和流场耦合的微孔隙流体流动数值模拟教程.docx

本 科 毕 业 设 计（论文） 题目：基于电场和流场耦合的微孔隙流体流动数值模拟 学生姓名：向李平 学 号专业班级：应用物理学10-4班 指导教师：王殿生 2014年6月20日 中国石油大学（华东）本科毕业设计（论文） 基于电场和流场耦合的微孔隙流体流动数值模拟 摘 要 随着常规油气资源的减少以及日益增长的油气需求，非常规的致密储层油气资源将成为油气开采的主要方向。在致密储层中微孔隙是油气存储和渗流的主要通道。在微孔隙中存在着流场、电场两场耦合作用；通过这些耦合作用可认识微孔隙中油气渗流的基本特征。 本文分析了微孔隙中电场和流场的耦合作用，根据双电层模型理论，应用电场的Poisson方程和流场的Navier-Stokes方程，建立了电场-流场耦合的数学模型；研究了COMSOL Multiphysics求解数学模型的基本方法；模拟计算了微孔隙中电场和流场相互作用时的电势分布和流速分布。 结果分析表明：饱和NaCl溶液的微孔隙中壁面双电层电势分布区域约为20nm，电势沿径向按指数规律递减；流体速度越靠近中心轴线越大，沿径向成二次项关系；外加电场引起的电势大小沿轴向下降，电势梯度越来越小；外加电场方向与压力下降方向一致时，流体速度显著增大，且外加电场越大速度增加越明显。研究结果为进一步认识孔隙结构和岩石电性对微孔隙流体流动的影响提供了参考。 关键词：微孔隙；流场；电场；双电层；数值模拟  Numerical simulation of fluid flow in micro-pore based on coupling electric and flow field ABSTRACT With the reduction and the growing demand for conventional oil and gas resources, unconventional tight reservoirs of oil and gas resources will be the main direction of the oil and gas exploration. In the dense micro-pores are the main reservoirs of oil and gas storage and flow in the channel. In the presence of micropores flow field, electric field coupling two; through these coupling can understand the basic characteristics of micropores hydrocarbon seepage. This paper analyzes the micropores electric and flow field coupling, electric double layer model based on theory, Poisson equation and Navier-Stoκes flow equations applied electric field, the establishment of a mathematical model of the electric field and flow field coupling; studied COMSOL Multiphysics The basic method for solving the mathematical model; simulate the potential micropores when interacting electric and flow field distribution and velocity distribution. The results showed that: the potential of the double electric layer with saturated NaCl solution, the distribution area of ??the wall surface of micropores of about 20nm, and the potential in the radial direction is exponentially diminishing; larger fluid velocity the closer to the central axis, and a quadratic relationship between the radi