Carbon dioxide flooding technology is an advanced method that significantly enhances the oil recovery rate of oil fields by injecting carbon dioxide into oil layers. In the initial stage, when carbon dioxide comes into contact with the crude oil in the formation, it cannot immediately form a mixed state. However, under specific pressure, temperature and crude oil composition conditions, carbon dioxide can form a mixed-phase leading edge. During this process, the supercritical fluid extracts heavier hydrocarbons from crude oil and continuously increases the gas concentration at the displacement leading edge. Ultimately, carbon dioxide and crude oil are transformed into a mixed-phase liquid, forming a single liquid phase, which efficiently displace crude oil from the formation to production Wells and significantly enhance the oil recovery rate of the oilfield.
