Effects of Four Important Factors on the Measured Minimum Miscibility Pressure and First-Contact Miscibility Pressure

作者：Yongan Gu, Pengcheng Hou, Weiguo Luo · 发表于：Journal of Chemical & Engineering Data · 年份：2013 · DOI：10.1021/je4001137 · 被引用次数：76 · 研究领域：Enhanced Oil Recovery Techniques、Hydrocarbon exploration and reservoir analysis、Petroleum Processing and Analysis

The vanishing interfacial tension (VIT) technique is applied to determine the minimum miscibility pressures (MMPs) and first-contact miscibility pressures ( P max ) of five light crude oil–CO 2 systems from the measured equilibrium interfacial tensions (IFTs) at different equilibrium pressures. The equilibrium IFTs are measured under various experimental conditions by applying the axisymmetric drop shape analysis technique for the pendant drop case. It is found that in each IFT test, the measured equilibrium IFT is reduced almost linearly with the equilibrium pressure in two pressure ranges. The MMP of each light crude oil–CO 2 system is thus determined from the measured equilibrium IFTs in range I by applying the VIT technique. The first-contact miscibility pressure ( P max ) of each light crude oil–CO 2 system is extrapolated from the measured equilibrium IFTs in range II. Moreover, the test temperature, crude oil composition (dead/live oil), gas composition (pure/impure CO 2 ), and initial gas–oil ratio (GOR) are studied to examine their specific effects. The experimental data show that the measured MMPs and P max values of five light crude oil–CO 2 systems increase linearly with the temperature. The presence of CH 4 in the CO 2 phase results in substantially higher MMP and P max . An increased initial GOR leads to marginally higher MMP and P max .