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.
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