Abstract: Condensate gas reservoir is a kind of particular gas reservoir. During the primary depletion, it was inevitable that the retrograde condensation phenomena happened, thus enhancing the saturation of the liquid phase in the reservoir and reducing the productivity of the gas well. In this paper, on the basis of single well simulation of near wellbore retrograde condensation pollution and saturation distribution of the representative well (Bai 52 well) of Baimiao condensate gas field, assisting with the well test interpretation results and pseudosteady state equation, a quantitative method was put forward to evaluate the effect of near wellbore retrograde condensation pollution on gas well productivity. It provided the theoretical supports for the basis of analyzing condensate gas well productivity variation regularity, and the proper development strategy and drainage process.

Key words: condensate, saturation, retrograde condensation, skin factor, productivity