Effect of pressure, temperature, and mass fraction of CO2 on the state of the resin in crude oil

Abstract

ABSTRACTThis paper focus on the main influence factors (temperature, pressure, and mass fraction of CO2) on the state of resin in the crude oil during CO2 flooding by using a visualization method. The state of resin is not affected by the variation of the temperature. Only when the pressure is increased to a certain value, the state of resin can be affected by the variation of the pressure. During the variation of the mass fraction of CO2, the state of the resin has a significant change, including the growth out of nothing, expansion from small to large, and transformation from a adsorbed solid to a flowable liquid. During the actual application process of CO2 flooding in oilfield, the influence of the temperature can be ignored, the appropriate mass fraction of CO2 is below 30% and the gas injection pressure should maintain a relatively low value. The results can provide a theoretical basis to avoid the resin aggregation during CO2 flooding.