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注入动态模型是注气井模拟与分析的关键。本文基于吉林油田油藏注气资料,引用Vogel无因次流入动态曲线建模的思想,采用CMG软件的组分模拟器GEM,综合考虑了注气压力、地层压力、渗透率和泄油半径等影响参数,建立圆形封闭边界单层注气油藏单井网格模型,统计分析注气量与井底流压的关系,建立CO2注入动态的无因次方程。吉林油田3口注气井实例计算表明:新模型平均误差仅为5.8%,能真实反映吉林油田注气动态。该研究成果对注CO2提高采收率具有理论价值。
The injection of dynamic model is the key to simulation and analysis of gas injection well. Based on the gas injection data of Jilin Oilfield, the paper introduces the idea of Vogel dimensionless inflow dynamic curve modeling and adopts component simulator GEM of CMG software to consider gas injection pressure, formation pressure, permeability and drainage radius Influence parameters, a single-well grid model of circular closed boundary monolayer gas injection reservoir is established, the relationship between gas injection volume and bottom hole flow pressure is statistically analyzed, and a dimensionless dynamic equation of CO2 injection is established. The calculation of three injection wells in Jilin Oilfield shows that the average error of the new model is only 5.8%, which can truly reflect the gas injection dynamic in Jilin Oilfield. The results of this study have theoretical value for CO2 recovery enhancement.