应力敏感砂岩地层三区复合凝析气藏不稳定试井模型

深层异常超高压砂岩储集层往住具有应力敏感性，用常规的试井模型难以分析这种凝析气藏的试井测试资料。为了给应力敏感凝析气藏试并测试资料分析提供理论基础，针对砂岩地层井底压力低于露点压力凝析气藏的特点，建立了考虑应力敏感性砂岩地层三区复合凝析气藏试井模型，同时还考虑了井筒存储效应和表皮效应。该模型的数学模型为非线性方程组，通过摄动理论，求得了该数学模型无因次井底拟压力的Lapalce空间解，分析了该试井模型的无因次井底拟压力及其导数的理论曲线特征。研究表明，拟压力导数曲线上翘特征并不一定是不渗透外边界引起的。

Three-zone composite well test model of condensate gas reservoir in stress-sensitive sandstone

Abnormal geopressured deep sandstone reservoirs exhibit stress-sensitive permeability. Well test model based on constant rock permeability can not exactly analyze the transient pressure in the condensate gas reservoirs. In order to supply theoretical model for transient pressure in condensate gas reservoirs with stress-sensitive permeability, 3-zone composite well test model of condensate gas reservoir in stress-sensitive sandstone is presented, in which the wellbore storage and skin are considered, including strong nonlinear equations. A regular perturbation technique is used to solve the nonlinear equations and to obtain the solution of dimensionless pseudo-pressure in Laplace space. The curves of pseudo-pressure function and its derivate indicated that the upwarping feature of the pseudo-pressure derivate curve is not necessarily caused by impermeable boundaries.