凝析气藏气液相变引起的压力恢复特征研究

为揭示凝析气藏气液相变对压力恢复响应的影响,建立了油气两相流定解问题,得到压力恢复响应解析解。通过描述压力恢复特征,提出压力响应分析应根据关井时刻井底压力和初始地层压力分别考虑。对实例井分析表明,单相流与两相流在压力恢复曲线上存在明显差别。同时,不同恢复井底压力下,凝析油含量径向分布在不断变化。

Study on Characteristics of Pressure Buildup with Gas Condensate Phase Behavior Changing

In order to investigate the influence on pressure buildup response, a definite solution problem of gas condensate two-phase flow is established in this paper and analytical solution of pressure buildup response is derived. By describing characteristics of pressure buildup,it is presented that the analysis of pressure response should be differently considered based on bottom hole flowing pressure at the closed time and initial formation pressure. The application instance indicates that there is noticeable difference between pressure buildup curve of single phase and two phase flow. In addition, the radial distribution of condensate is varying with different bottom hole flowing pressure.