多孔介质中油气体系相平衡规律研究

油气体系和储层多孔介质是一个相互作用的系统，当地层压力低于饱和压力时，储层中同时存在气、液、固（指岩石）三相，在多孔介质中，由于孔隙半径小，因而毛细管压力应予以考虑，在建立了考虑毛细管压力的相平衡计算模型之后，针对二个凝析气藏，一个黑油油藏和一个挥发油藏，分别对其油气体系的毛细管压力，饱和压力和恒组成膨胀过程中液相含量进行了相态模拟模拟计算，总结出毛细管压力对油气体系相平衡的影响规律。

The Phase Equilibrium of the Oil-Gas System in the Porous Media

The oil-gas system and the porous media are interaction system. The three phases of vapor, liquid and solid (rock) will co-exist in the porous media when the pressure is under the saturation pressure. Since the pore radius is very tiny in the porous media, the capillary pressure should be considered. The phase equilibrium calculation model concerning capillary pressure is established in this paper. The capillary pressure, the saturation pressure, and the liquid content of the constant compositional expansion are calculated by using this model for one black oil reservoir, one volatile oil reservoir and two gas condensate reservoirs. The conclusion of the capillary pressure effect on the oil-gas system is summerized at the end of this paper.