天然气地球科学 ›› 2021, Vol. 32 ›› Issue (9): 14031409.doi: 10.11764/j.issn.1672-1926.2021.04.013
Zhiyong KANG(),Xingwen ZHANG,Xiangguang HUANG,Yan HUI,Long LI
摘要:
为了解决凝析气体积系数在凝析气藏评价中高压物性(PVT)取样分析成本高,借用天然气体积系数公式计算精度又明显偏低这一实际问题,以凝析气体积系数定义及气体状态方程为理论基础推导并建立了凝析气体积系数新方程,同时建立了地层凝析气摩尔组分反演公式。用新方程计算凝析气组分和凝析气体积系数的应用效果明显优于传统方法。采用生产气油比和凝析油密度可将地面天然气组分和凝析油组分还原为地层凝析气组分,且反演精度大于99%;采用新建凝析气体积系数理论方程计算凝析气体积系数不仅大幅降低凝析气PVT取样分析成本,计算精度也由72.9%提升到86.2%,满足了凝析气藏在勘探开发各阶段的评价研究需求。
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