高凝析油含量凝析气藏单井衰竭式开发动态预测

Performance Prediction of Natural Depleting Development of Condensate Reservoir with High Gas Condensate Content with a Single Well

饱和凝析气藏在开发过程中,地层会出现反凝析现象,各相组份及物理化学特性也会有所改变。应用PR三参数平衡状态方程拟合了凝析气藏流体PVT实验数据,建立了单井径向非均匀网格系统,应用凝析气藏多组分渗流数学模型和组分模拟软件进行预测,得到近井地带压力分布特征和凝析油饱和度分布特征,体现了近井地带反凝析液增大了流体渗流阻力。通过实际气井开发动态数据成功拟合了数值模型,将其用于衰竭式开发动态预测,评价了采气速度对地露压差小的高凝析油含量凝析气藏油气采收率的影响,为凝析气藏开发方案优选气井合理生产制度提供依据。

Retrograde condensation will occur and components of every phase and its physical or chemical properties will change during development in saturated condensate reservoir.PVT laboratorial data of fluid from condensate reservoir are matched by using PR three-parameter state equation.Radial non-uniform gridding system for single well is established.Prediction is conducted by usingmathematical model of multi-component flow in condensate reservoir and component simulation software,and distribution characteristics of pressure and condensate gas saturation near the well-bore are obtained,andwhich shows thatthe retrograde condensed liquid nearthewell-bore increases the resistance forfluid flow.Field development performance data of gas wells matched the numerical model very successfully,and then the method was used to predict the development performance,and to estimate the influence of gas recovery rate to oil/gas recovery efficiency of condensate reservoirwith high condensate oil content,and so to provide some guides for optimizing reasonable production rate in making development program for condensate reservoirs.