IN RETROGRADE RESERVOIRS BELOW DEW POINT PRESSURE WE HAVE TWO PHASES IN RESERVOIR (GAS AND LIQUID PHASE). INITIALLY THIS LIQUID IS IMMOBILE, BUT AS SOON AS THE CRITICAL LIQUID SATURATION HAS BEEN EXCEEDED, THE LIQUID CAN EVENTUALLY FLOW TOWARD THE WELLBORE AND IT CAN PRODUCE THEREFORE, WE DEFINE THREE DIFFERENT Recovery Factor (DRY GAS RF WHICH IS THE TOTAL PRODUCED GAS AT SURFACE PER TOTAL INITIAL GAS IN PLACE, WET GAS RF IS THE TOTAL PRODUCED WET GAS AT SURFACE PER TOTAL INITIAL GAS IN PLACE AND CONDENSATE RF WHICH IS THE TOTAL GAS CONDENSATE PRODUCED AT SURFACE PER THE TOTAL PRODUCED GAS AT SURFACE) AND THEN USING SIMULATION, THE EFFECT OF SOME PARAMETERS SUCH AS RESERVOIR PERMEABILITY, PERCENTAGE OF CRITICAL CONDENSATE’S SATURATION, PERCENTAGE OF HEAVY COMPOSITIONS, DIFFERENT SCENARIOS OF PRODUCTION AND FINALLY CHANGES OF FLOW RATE ON DIFFERENT RF AFTER SIX YEARS OF PRODUCTION CAN BE ANALYZED.