Abstract
The minimum miscible pressure of CO2 and crude oil in CO2 flooding process is a key indicator of whether it can reach the miscible state. The characteristics of oil-gas miscible zone provide an important basis for the study of CO2 flooding minimum miscibility pressure. Taking the underground oil sample of an oil field in China as an example, the minimum miscibility pressure test of CO2 and crude oil was carried out based on the slim tube experiment. The numerical simulation technique was used to fit the PVT data of crude oil, and the critical parameters of the pseudo component were obtained. Then, through the simulation slim tube experiment method, the multi-contact miscibility of CO2 and crude oil was calculated. The characteristics of oil-gas interfacial tension and miscible zone are analyzed. The interfacial tension and miscible zone during the mixing process of CO2 and crude oil are quantitatively characterized, and their variation trend with the volume and pressure of CO2 injection is also described. It provides a reference for accurate prediction of the minimum miscible pressure of CO2.
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