Effect of Impurities in Industrial Flue Gas on Minimum Miscibility Pressure in CO2 Flooding

摘要

Understanding the effect of impurities(non-CO2 gases)in industrial flue gas on the minimum miscibility pressure(MMP)is necessary for the design and implementation of a cost-effective flue gas enhanced oil recovery process.Slim tube experiments of effect of O2 concentration in CO2 on MMP are carried out on the model oil(n-C5H_(12)/n-C_(16)H_(34))and Jiangsu crude oil with three types of gases having various O2 contents.The results indicated that the MMPs for these oils increase with increasing O2 contents in the CO2 streams.The experimental results and the case are also supported by our modeling work using a new multiple-mixing-cell model,which is found to be a robust and more accurate method with a tie-line length for determining the MMP.The calculation results indicated that MMPs decrease with increasing H2S and SO2 impurity contents,and increase with increasing O2,CO and N2 impurity concentrations in the CO2 streams.