关键词: 凝析气藏, 凝析油, 临界流动饱和度, 采收率, 相对渗透率曲线

Abstract: The depletion experiments on practical condensate gas samples were carried out by means of PVT cells and cores. The results of experiments show that recovery efficiency of condensate oil in PVT cells is lower than that in cores. In order to investigate the difference of recovery efficiencies of the experiments, the critical flow saturation of condensate gas in core was tested. The conventional relative permeability curves of kerosene displacement with N₂ and the equilibrium oil-gas relative permeability curves at high pressure and high temperature were developed. The two kinds of curves and GEM software were respectively used to simulate the depletion experiments in PVT cells and cores. The simulation results show that the recovery efficiency of condensate gas predicted with conventional relative permeability curve is close to that in PVT cells. The recovery efficiency of condensate oil predicted with equilibrium oil-gas relative permeability curve is close to that with the depletion experiments in core. The equilibrium oil-gas relative permeability curves can express the state of condensate gas flowing in cores.

Key words: condensate gas reservoir, condensate oil, critical flow saturation, recovery efficiency, relative permeability curves