深层高温高压凝析气井压力分布的简便算法

Exact and simple method for calculating pressure distribution in deep gas condensate well with high temperature and pressure

在流体相平衡理论基础上,综合考虑压力、温度的相互影响及动能变化的影响,同时将流体偏差系数考虑为压力和温度的函数,建立了新的凝析气井井筒压力分布计算模型。计算时将井筒分成若干段,在每段中进行迭代求解。新的压力计算模型与常用的平均温度和平均偏差系数计算方法的实例对比表明,新计算模型具有较高的精度,可用于深度超过4000m的高温高压凝析气井井筒压力分布计算。

Based on the principle of phase equilibrium of fluid, a new model for calculation of pressure distribution in gas condensate well was established in consideration of the effects between temperature and pressure and the effect lead by the change of kinetic energy. The deviation factor is also considered as a function of temperature and pressure in the model. The wellbore was divided into many parts, and iterative calculation was executed within every part during the whole calculation. The new model and the model of average deviation factor and average temperature were compared. The result indicates that the new model has a better precision and may be used in the calculation of pressure distribution in gas condensate well with high temperature and pressure when the depth of well is over 4?000 meters.