可视装置中CO2与正戊烷或原油接触特征和表征方法

CO₂混相驱油过程复杂，其中包括传质、对流和相变等问题，有些机理尚不明确，需要进行深入研究。采用联合研制的CO₂混相可视驱油实验装置，恒定不同的实验压力，研究CO₂在不同相态下与正戊烷、原油的垂直静态变化特征。CO₂和正戊烷、原油在不同压力下表现为不同的接触形态，正戊烷、原油相对高度-时间曲线为幂函数关系，低压时曲线也可为近似线性变化。提出了“溶解膨胀速率”，不同压力条件下CO₂-正戊烷、原油溶解膨胀速率随着时间变化呈减小趋势，变化曲线均为负对数关系；影响正戊烷、原油相对高度和CO₂-正戊烷、原油溶解膨胀速率的因素主要是压力和流体。 

Visual contact characteristics and characterization of the CO2 and n-pentane/crude oil interface

CO₂ miscible flooding is complex, including mass transfer, convection, phase transition and other issues. Some mechanisms are not clear and need in-depth study. The static characteristics of n-pentane or crude oil and CO₂ in different phases were studied by using a CO₂ miscible flooding visual device under different experimental pressures. CO₂ and n-pentane or crude oil show different contact characteristics under different pressures. The relationship between n-pentane or crude oil relative height and time is a power function, and the curve at low pressure can also be approximately linear. The dissolution swelling rate of CO₂ vs. n-pentane or crude oil under different pressure conditions shows a decreasing trend with time, and the curves are negative logarithmic. The factors influencing the relative height of n-pentane or crude oil and the dissolution swelling rate of CO₂ vs. n-pentane or crude oil are mainly pressure and fluid properties.