Exploitation of gas-condensate reservoir is gradually associated with a large pressure drop afterproduction over the years of recovery. This pressure drop has led the reservoir fluid to be in retrogradecondensation region and as a result, a large liquid separates from gas in the dome and remains in thereservoir.In this study, parts of reservoir with their properties and using compositional simulation, differentscenarios have been examined as the injection of different gases into a gas condensate reservoir. In thefollowing, the effect of injection rate, duration, and pressure have been investigated so that the best statecan be selected through observing the results from simulation and considering economic considerationsincluding the price of gas, gas liquids, and injected gas and cost of the required equipment
