Abstract: The numerous experiments show that non-equilibrium phase change caused by high-velocity flow has noticeable effects on the condensate oil saturation within the immediate vicinity and productivity of oil well.Based on the non-equilibrium phase change law and the distribution of flow parameters near well bore,the non-equilibrium effect of condensate gas flow was evaluated.A formula for calculating the distribution of condensate oil saturation in consideration of the effect of non-equilibrium phase change is presented.The contrast of different inflow performance relationship models and condensate oil saturation distributions indicates that enlargement of pressure difference can increase the productivity by enhancing the effect of non-equilibrium phase change and decreasing the condensate oil saturation.A reasonable method for determination of pressure difference taking condensate oil saturation distribution as a key factor is proposed.

Key words: condensate gas reservoir, non-equilibrium, phase change, production pressure difference, productivity

摘要： 鉴于反凝析油在近井地带的聚集引起产能损失的问题,在制定凝析气井工作制度时,通常以控制生产压差为主,往往忽略高速流动下凝析气液相变的非平衡特征与毛管数效应.为此,分析了凝析气非平衡相变与向井流规律,评价了凝析气在流动过程中的非平衡相变特征和毛管数效应,阐述了凝析液聚集的变化规律.结果表明,流体在高速流动条件下,增强高速流动效应有利于提高凝析气井产能.在对产能预测结果对比的基础上,提出了以凝析液饱和度分布控制为主的凝析气藏合理生产压差确定方法.

关键词: 凝析气藏, 非平衡, 相变, 生产压差, 产能