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目前，标准的PVT筒中的凝析气定容衰竭实验都是在空筒内完成的，没有考虑多孔介质的影响，这与实际情况相差甚远。文章采用富含凝析油型真实凝析气体系分别在PVT筒和长岩心中进行衰竭实验，表明多孔介质中凝析油采收率比PVT中高约1倍，天然气采收率和PVT筒中测试相比差别不大。此外，还开展了真实凝析油气相渗曲线和常规油气相渗曲线测试，发现二者差别很大，经过进一步的分析，表明造成凝析油采收率差别的主要原因是凝析油气相渗曲线的差别。研究还发现凝析气藏凝析油采收率有速度敏感性，衰竭速度快有利于提高凝析油采收率；常规PVT筒测试的凝析油采收率不能用于开发评价，在开发方案及动态分析数值模拟中，使用平衡凝析油气相渗曲线对多孔介质中凝析油采收率预测更为可靠。

STUDY ON RECOVERY FACTOR OF CONDENSATE GAS RESERVOIRS WITH RICH CONDENSATE OIL EXPLOITED BY DEPLETION DRIVE 1)

At present, the condensate gas depletion test with constant volume is performed in standard PVT, which doesn t consider the influence of porous medium. So, it hardly fits the real situation. The depletion tests of real condensate gas with rich condensate oil are performed in PTV and long cores respectively. It is revealed that the recovery factor of condensate oil in the porous medium is 2 times of that in PVT, and the recovery factor of gas in the porous medium is similar with that in PVT. Also, the real condensate oil/gas phase percolation curve and the common oil/gas phase percolation curve is tested respectively. Big difference is found between them. Further more study shows the main reason why the recovery factor of condensate oil differs so much is the difference between condensate oil/gas phase percolation curves. And it is found the recovery factor of condensate oil has rate sensitivity in condensate gas reservoirs. Fast depletion rate is favorable to improve recovery factor of condensate oil. The recovery factor of condensate oil measured by PVT test can t be used for production evaluation. In development program and numeral simulation of performance analysis, it is more reliable to estimate the recovery factor of condensate oil on porous medium with balancing condensate oil/gas phase percolation curves.