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为达到较高的凝析油采收率,对高凝析油含量的牙哈23凝析气藏采用了回注干气的开发方式。目前气藏开发过程中的主要矛盾是部分生产井气油比升高加快,导致凝析油产量急剧下降,回注干气效果变差。从气藏地质特征分析出发,描述了储集层的非均质特征,通过对生产剖面测试、示踪剂监测和单井生产动态的研究,认为气油比上升加快的主要原因是干气突破。研究了回注干气的推进规律,根据动态分析结果对全气藏气、水相态特征及饱和度的变化规律进行了开发动态数值模拟,最终确定出剩余高凝析油含量的富集区,为气藏的开发调整、改善回注干气的开发效果、提高凝析油采收率提供依据。
In order to achieve a higher condensate recovery rate, the development of high-condensable oil content of the Yaha 23 Condensate Gas Reservoir using dry gas injection method. At present, the main contradiction in the development of gas reservoirs is that the ratio of gas to oil in some production wells is increased rapidly, leading to a sharp drop in condensate production and a worse return to dry gas recovery. Based on the analysis of geological characteristics of gas reservoirs, the heterogeneity characteristics of reservoirs are described. Based on the studies of production profile test, tracer monitoring and single-well production dynamics, the main reason for the quickening of gas-oil ratio is the breakthrough of dry gas . Based on the dynamic analysis results, the dynamic numerical simulation of the evolution of gas and water phase characteristics and saturation in the whole gas reservoir was carried out. Finally, the enrichment zone of the remaining high condensate oil content was determined , Providing the basis for the development and adjustment of gas reservoirs, improving the development effect of reinjection dry gas and enhancing the recovery of condensate oil.