多孔介质中预交联凝胶颗粒渗流规律模拟

为了研究预交联凝胶颗粒(PPG)在多孔介质中的渗流规律,基于物质守恒定律建立反映预交联凝胶颗粒孔喉堵塞、堵塞颗粒变形重启动特性的PPG驱数学模型,并采用IMPES方法和四阶Runge-Kutta方法求解。结果表明:PPG可以在不伤害中、低渗部位前提下实现油藏深部调剖;PPG的注入速度和注入体积分数是影响调剖效果的重要因素;PPG粒径与孔喉直径的匹配性和临界压力是影响调剖效果的关键因素,粒径与孔喉直径之比和重启动临界压力较低时无孔喉堵塞,粒径与孔喉直径之比和重启动临界压力过高会造成储层伤害。

Modeling on flowing rules of performed-particle-gel in porous media

In order to study the flowing rules of performed-particle-gel(PPG) in porous media, a performed-particle-gel flooding mathematical model characterizing the throat blocking and particles restarting was established based on the mass conservation law. The IMPES method and Runge-Kutta method were used to solve this mathematical model. The results show that PPG can realize deep profile control without damaging the medium and low permeable parts. PPG injection rate and injection volume fraction are the important factors influencing the profile control effect. The critical pressure and the compatibility between PPG diameter and throat diameter are the key factors determining the profile control effect. When the diameter ratio of PPG to throat and the critical pressure of restarting are lower, throat blocking can not occur. However, larger diameter ratio of PPG to throat and higher critical pressure may damage the reservoir.