油藏条件下超临界CO2乳液转相乳化规律及渗流特征

项目名称： 油藏条件下超临界CO2乳液转相乳化规律及渗流特征

项目编号： No.51304229

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 李松岩

作者单位： 中国石油大学（华东）

项目金额： 25万元

中文摘要： 形成超临界CO2乳液是驱油过程中控制CO2流度控制的有效方法，在不同条件下可以形成C/W型和W/C型两种乳液，而W/C型乳液中CO2作为连续相是不能降低其流度的，本课题通过实验研究渗流条件下两种乳液的形成条件和对CO2流度控制规律。首先，研究油藏条件下超临界CO2乳液稳定特征，弄清表面活性剂、矿化度、温度、压力等因素对超临界CO2乳液稳定性、乳液粒径分布的影响规律，获得油藏条件下稳定的CO2乳液体系；其次，研究油藏条件下超临界CO2乳液转相乳化形成机制，分析CO2体积分数、表面活性剂、温度、压力等因素对C/W型向和W/C型超临界CO2乳液转相乳化影响特性；最后，研究油藏条件下超临界CO2乳液渗流和驱油特征，得到C/W型和W/C型乳液岩心渗流过程中连续相和分散相的相渗规律和调剖分流规律。研究成果可以指导超临界CO2乳液驱油注入参数和油藏参数的筛选，为改善CO2驱油效果提供理论基础。

中文关键词： CO2乳液；界面特性；稳定性；微观机理；调剖驱油

英文摘要： Supercritical CO2 emulsion is an effective method for CO2 mobility control in the oil recovery, and under different conditions C/W type and W/C type emulsion can form. However, W/C emulsion can not reduce CO2 mobility because CO2 is the continuous phase. In the research the formation conditions for C/W type and W/C type emulsion and CO2 mobility control law will be studied by experimental method under seepage condition. Firstly, through experimental method we will study stability of supercritical CO2 emulsion under reservoir condition, study effect of surfactant, salinity, temperature, and pressure on supercritical CO2 emulsion stability, and droplet diameter distribution, obtaining stable CO2 emulsion system under reservoir condition.Then, we will study formation mechanism of phase inversion emulsification for supercritical CO2 emulsion under reservoir condition, study the effect of CO2 volume fraction, surfactant, temperature, and pressure on the inversion from C/W type to W/C type supercritical CO2 emulsion. We will study supercritical CO2 emulsion flow and flooding characteristics under reservoir condition, study relative permeability and profile control for continuous and dispersed phase in C/W type and W/C type CO2 emulsion. Through the research we will obtain suitable injection and reservoir parameters fo

英文关键词： CO2 Emulsion；Interface Characteristics；Stability；Micromechanism；Plugging and Oil Displacement