Abstract: As a condensate gas reservoir with high content of condensate oil, Taha-23 condensate gas reservoir is developed by dry-gas reinjection process for EOR. At present, the main problem during its development is that gas-condensate ratios of a part of wells increase quickly, causing rapid decline of condensate production and poor reinjection effectiveness. This paper analyzes the geological feature of the reservoir, describes its heterogeneity and researches the production profile testing, tracer testing and well production performance. It is suggested that gas breakthrough is the main reason for the high gas-condensate ratios. Therefore, the numerical simulation of production performance is conducted, including dry-gas reinjection advancing, gas-water phase behavior features and their saturation variations. Finally, the remained high condensate areas are determined. These provide solid bases for development adjustment, EOR and improvement of dry-gas reinjection effectiveness.

Key words: Tarim basin, condensate gas reservoir, dry-gas reinjection, production profile, tracer, numerical simulation