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根据天然气和反凝析液在地层中渗流特点 ,结合凝析气体系相态理论及闪蒸计算方法 ,运用状态方程进行模拟 ,考虑流体相态和组分的变化以及凝析气井的表皮系数 ,引入稳态理论的两相拟压力函数 ,建立适合凝析气流入动态预测的方法 ,并根据凝析油的临界压力和临界饱和度与渗流的关系 ,给出了预测凝析气井井底流压的数学模型 :①井底压力高于露点压力时的渗流数学模型 ;②井底流压低于露点压力且凝析油饱和度小于临界饱和度时的渗流数学模型 ;③井底流压低于露点压力且凝析油饱和度大于临界饱和度时的渗流数学模型。根据这一思路编制了完整的计算软件。该方法适用于凝析气井流入动态预测。参 9(喻西崇摘 )
According to the seepage characteristics of natural gas and counter-condensate in the formation, combined with the phase theory of condensate gas system and the flash calculation method, the equation of state is used to simulate. Considering the variation of fluid phase and composition and the skin coefficient of condensate gas well, A two-phase quasi-pressure function of steady-state theory is introduced to establish a method suitable for dynamic prediction of condensate inflow. According to the relationship between critical pressure and critical saturation of condensate and seepage, Mathematical model: (1) mathematical model of seepage flow when bottom hole pressure is higher than dew point pressure; (2) mathematic model of seepage when bottom hole flow pressure is lower than dew point pressure and condensate oil saturation is less than critical saturation; (3) bottom hole flow pressure is lower than dew point pressure and condensate The seepage mathematical model with oil saturation greater than critical saturation. According to this idea compiled a complete calculation software. The method is suitable for dynamic prediction of condensate gas well inflow. Participation 9 (Yu Xizong pick)