Abstract
This paper focus on the effect of the pressure and CO2 content on the state of asphaltene in the light crude oil from Changqing oilfield. When the pressure is more than 7 MPa or the CO2 content is more than 10%, the aggregation of the asphaltene occurs. With the increase of the pressure from 7 MPa to 10 MPa or the increase of CO2 content from 10% to 40%, the amount of the asphaltene aggregates has a significant increase. The experiment results of the effect of CO2 content and pressure on the asphaltene precipitation in the light crude oil is different from that of the heavy oil. The conclusion can provide a theoretical basis to avoid the asphaltene precipitation the light crude oil during CO2 flooding.