Abstract: In sandstone condensate gas reservoirs, production declined rapidly after water breakthrough and countermeasures were expensive and difficult. In the condensate gas reservoirs in T₂a³ in the block AT1 of the Tahe Oilfield, wells were deployed unevenly, resulting in excessively high recovery speed regionally, strong re-servoir heterogeneity, strong gas recovery intensity in initial stage, and restricted potential prediction. The abnormal signals in production indicated bottom oil in gas reservoirs. Oil-based water-plugging agent was applied to improve recovery rate. Interlayers and plane heterogeneity were applied to tap residual oil.