关键词: 凝析气藏, 低渗多孔介质, 相态, 相渗曲线, 凝析油采收率

Abstract: The depletion experiments on the condensate gas systems with different condensate oil content were carried out in PVT cells and long cores.The condensate oil saturation was tested.The conventional relative permeability curves at the ordinary temperature and low-pressure,and the equilibrium oil-gas relative permeability curve at high pressure and high temperature were determined.The results showed that the recovery of condensate oil from the long cores is two times larger than that in PVT cells.The condensate oil recovery prediction of the depletion experiment in PVT cells and long cores by the two kinds of curves and CMG simulation software showed that the different relative permeability curves with different interfacial tension lead to the variation of condensate oil recovery.It is suggested that the real relative permeability curves should be used in the numerical simulation.For the condensate gas reservoir with low condensate oil,the condensate oil saturation in long cores is higher than that in PVT cells,and there is not evaporation phenomenon.The condensate oil saturation still remains the maximum value in despite of the pressure declining.It shows that the formation in the tight condensate gas reservoir would be damaged by the condensate oil.

Key words: condensate gas reservoir, tight porous media, phase state, relative permeability curves, condensate oil recovery