Abstract: As a usual, compositional model is used to simulate miscible flooding. However, because of its slow calculation and much data difficult to be got, it is not very easy to use by reservoir engineers. So this paper introduces a simulation model for miscible flooding. It is a developed pseudocompositional model based on conventional black oil model, and it has good stability and fast calculation of black oil model, and also has the compositional model characteristic such as simulation of condensate gas reservoir and miscible displacement etc. In addition, the paper presented the mathematical model and the approach to deal with different physical parameters and fluid properties. The model was used to verify the SPE example, it proved to be true.

Key words: miscible flooding, mathematical model, black oil model, condensate gas reservoir