Abstract: Many factors such as components, gas-oil ratio (GOR) and non-equilibrium effect have some affects on dew point pressure of conden-sate gas. The components of condensate gas have different effects on the dew point pressure. The influences of propane, butane and hydrogen sulfide on the dew point pressure of condensate gas are obvious. GOR have multiple effects on the dew point pressure. When GOR is larger than some value, the dew point pressure increases with GOR increasing. However, when GOR is larger than the value, larger GOR may lead to smaller dew point pressure. The ideas about the effects of porous media on the dew point pressure seem to be still controversial in some literatures. As the composition has a heavy influence on the dew point pressure, the continuous change of composition of fluid near well may result in the complex phase behaviors near the well bore during the production. Accurate determination of the dew point pressure is helpful to evaluate the production of condensate gas reservoir.

Key words: gas condensate, dew point pressure, fluid component, gas-oil ratio, porous media, affecting factors

摘要： 凝析气藏流体的露点压力受到许多因素的影响,如流体组分、气油比、多孔介质、非平衡效应等。不同组分对流体露点压力的影响程度不尽相同,其中C₃、C₄、H₂S等组分的影响很明显。气油比对露点压力具有双重效应,当气油比低于某一数值时,露点压力随气油比增大而增加;当高于此数值时,露点压力又随气油比增大而减小。关于多孔介质对流体露点压力的影响的认识还存在相互矛盾。流体的相态受到组分和组成的极大影响,在生产过程中,近井周围流体的组成在不断变化,从而导致近井周围出现复杂的相态变化。对凝析气露点压力的确定方法及其影响因素的深入研究,将有助于正确评价凝析气藏的生产动态特征。

关键词: 凝析气, 露点压力, 流体组分, 气油比, 多孔介质, 影响因素