多孔介质凝析气相变的影响因素

凝析气相变多孔介质影响因素机理分析是准确认识凝析油气体系在多孔介质中渗流规律的基础，而凝析油气体系和储层多孔介质又是一个相互作用的系统。由于储层岩石颗粒较细、孔隙细小，凝析油气在储层孔隙介质间渗流过程中必然与其发生相互作用，影响凝析气在多孔介质中的相变规律。文章在凝析气相变模拟计算的基础上，从机理出发分析了毛细管压力、吸附作用、润湿性和毛细凝聚等因素对凝析气相平衡的影响。研究表明，各种影响因素对相变的影响均有不同程度，而且应当将储层本身性质（如孔隙大小、渗透率等）与影响凝析油气体系的各种因素联系起来，综合分析多孔介质对凝析油气体系相平衡的影响。

INFLUENTIAL FACTORS ON PHASE CHANGE OF CONDENSATE GAS IN POROUS MEDIA

Analysis of the influential factors of phase change of condensate gas in porous media is the basis to accurately understand the percolation pattern of condensate gas system in porous medium, while condensate gas system and porous media consist of an interactive system. As the grain sizes of reservoir rock are relatively fine and the pores are small, the condensate gas system certainly interact with the porous media during percolation, thus influencing its phase change pattern in the porous media. Based on analogue calculation of the phase change of condensate gas, this paper analyzes the influences of various factors on phase equilibrium of condensate gas, such as capillary pressure, absorption, wettability and capillary condensation. Study shows that all the influential factors can influence the phase change to some degree, and the influences of porous media on the phase equilibrium of condensate gas system should be comprehensively analyzed by integrating the reservoir properties, such as porosity and permeability, with various influential factors of the condensate gas system.