凝析气藏开采中的几个问题

指出传统凝析气藏油气分布模型存在的问题,推荐三区渗流模型,并提出凝析气藏多区多相油气分布的概念。分析了不同开采阶段气藏露点压力和油气相渗变化特征,并将油气相渗进行性变化的思想引入凝析气藏的试井分析中,提出基于多区多相油气分布模型的凝析气藏不稳定试井和产能试井分析方法。指出目前凝析气藏生产压差确定存在的问题,强调了合理确定生产压差的原则与方法。

Some Problems in Development and Production of Gas Condensate Reservoirs

The problems existed in traditional model of condensate and gas distribution in gas condensate reservoirs are pointed out in the paper. Three zone model of flow in porous media is recommended, and multi zone and multi phase model of condensate and gas distribution in gas condensate reservoirs is firstly presented. The varying characteristics of dew point pressure and condensate and gas relative permeability during different development and production phases are analyzed. The concept of condensate and gas relative permeability varying with production is introduced into gas condensate well test analysis. The analysis methods of transient well test and production well test based on multi zone and multi phase condensate and gas distribution model are advanced. The present problems in determining production pressure difference of gas condensate reservoirs are indicated and principles and method to acquire reasonable production pressure difference are emphasized.