For the characteristics of condensate gas reservoirs

evaluation methods on just one side would lead to misjudgment on retrograde condensation of gas reservoir. Therefore

qualitative and quantitative comprehensive evaluation method of retrograde condensation damage was established. Firstly

the retrograde condensate phase evaluation and production dynamic analysis were used to judge whether the retrograde condensation of gas wells occurred or not. And then

methods such as the gas well productivity

pollution skin coefficient

numerical simulation and pressure build-up testing were comprehensively applied to quantitatively evaluate the degree and radius of the retrograde condensate damage. The established method was carried out in the case of the well-169 of Zanarol condensate gas reservoir in Kazakhstan. The results show that gas condensate has occurred in Zanarol condensate gas reservoir. Retrograde condensation has great influence on oil productivity

but a little on that of gas. And the damage degree is different for different gas wells. Generally

retrograde condensation damage was little and its influence rate was less than 16 %. Pollution radius was about 20 m. Thicker gas layer and carbonate reservoirs with developed fracture-vug were important reasons for less influence of retrograde condensation damage on gas well productivity in Zanarol. The established method can be used as a reference for the analysis of complex condensate gas reservoirs.