Fluid-fluid interactions in a system of CO2, oil, surfactant solution, and brine at high pressures and temperatures - A Malaysian reservoir case

摘要

In this study, the interactions of fluids involved in foam assisted CO2 enhanced oil recovery process are studied at the prevailing conditions of a shallow Malaysian (sandstone) oil reservoir (pressure of 70-200 bar, and temperature of 102 degrees C). The equilibrium CO2 solubility into the reservoir brine, and crude oil, and the effect of foaming agent surfactants on the CO2 solubility into the aqueous phase are measured by using an equilibrium high pressure cell. The interfacial tension (IFT) measurements of gas-liquid and liquid-liquid systems are accomplished by utilizing the axisymmetric drop shape analysis (ADSA) adapted in a pendant drop tensiometer.