考虑非平衡效应的凝析气井井筒多相流模型

目前在模拟凝析气井筒相态变化和温度压力变化时，采用的都是等温瞬时平衡的概念。而在凝析气井生产过程中，由于气相的高速流动，气液相并不充分接触，液相析出后运动滞后而逐渐沉积，部分液相组分会因高速气流夹带而呈气相运动一段距离后才变成液相析出，也就是说液相析出量的多少要受到平衡时间的影响。在凝析气井井筒模拟中考虑非平衡时间的影响，基于质量、动量、能量守恒原理，导出了综合考虑井斜角、井筒和地层的热物理性质沿井深的变化，压力温度耦合以及非平衡气-水-油三相相变的井筒多相非平衡流模型（NM），通过对实例的计算验证，该模型能比较准确地反映了凝析气井的流动规律和动态，具有较好的工程应用价值。

Shaft Multiphase Flow Model for Condensate Gas Wells with Consideration of Non-equilibrium Effect

The concept of isothermal instantaneous equilibrium is often adopted at present for simulating the phase behavior change as well as changes of temperature and pressure in condensate gas wells. However, in the process of condensate gas well production, because of high velocity air flow, inadequate gas liquid contact and gradual deposition owing to lagging movement after the liquid precipitation, some liquid components will release due to high speed airflow entrainment and moving in form of gas; that is to say, the amount of the liquid released will be affected by equilibrium time. In the shaft simulation of condensate gas wells with consideration of impact of non equilibrium time, based on quality, momentum and energy conservation principle, the Non equilibrium Multiphase model (NM) has been conducted by considering changes of deviation angle, shaft and formation thermophysical nature changing with well depth, pressure temperature coupling and non equilibrium water gas oil phase changes. Through the calculation verification of examples, the model can reflect flowing laws and dynamics of condensate gas well accurately, having a relatively good engineering value.