甲醇-地层水-凝析气相态测试研究

在凝析气藏开采过程中，当地层压力降低到露点压力以下时，地层中将会发生反凝析现象，从而导致反凝析堵塞；如果有平衡共存水产出并形成井底积液,还可能产生反渗吸水锁效应进一步影响气井产能。目前国外有文献报道了注甲醇解除凝析气藏近井地层污染从而提高气井产能的方法，文章探索设计了甲醇-地层水-凝析气三相体系PVT相态测试方法，分析了考虑注入不同浓度甲醇对凝析油气体系相态的影响，从而为凝析气藏注甲醇提高气井产能提供翔实的PVT数据，更有效地指导了凝析气藏的开发。

PHASE BEHAVIOR TEST OF METHANOL/FORMATION WATER/CONDENSATE GAS SYSTEM

Retrograde condensate phenomenon will occur when formation pressure is lower than dew point pressure in process of production of condensate gas reservoir, resulting in retrograde condensation blocking. If equilibrium co existing water is produced and form liquid loading in bottom hole, water lock effects will occur due to reverse imbibition, further lowering the deliverability of gas well. It has been reported in oversea literature that near wellbore damage in condensate gas reservoir can be relieved through injection of methanol for improving deliverability of gas well. PVT phase behavior test is designed for methanol /formation water /condensate gas system. The influences of injecting methanol of different concentrations on condensate oil and gas system are analyzed. Detailed and accurate PVT data are provided for improving deliverability of gas well through injecting methanol, so as to guide more effectively the development of condensate gas reservoir.