A new K-value compositional model for a retrograde condensate reservoir, which obtains K-value in a more effective way, and can cut down the time and the cost in the phase equilibrium calculation and simulation, is presented in this paper. The major physical phenomena and mathematical model used in the simulator are described. An application of both the K-value compositional model and the compositional model based on the equation of state to the examples of SPE4271, SPE12278 and a condensate reservoir in China is shown to have good consistency.

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