Abstract: The paper recommends a method for calculating phase equilibrium and isopycnic depleted data by use of SRK equation of state. The calculation result matches well with experimental and computed ones in domestic literatures. Morcover , this mehtod was used to predict production performance of condensate reservoir in X_g Member of Kekeya oil and gas ficld by depleted and dry-gas reinjection processes.

Key words: Kekeya oil and gas field, Condensate reservoir, Phase equilibriun calculation, Multiple-order flashing, Depleted development, Dry-gas reinjection development, Performance prediction