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计算,并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 OILOGAS SYSTEM IN THE POROUS MEDIA

The oilOgas system and the porous media are interaction system. The three phases of vapor , liquid and solid (rock) will coOexist in the porous media when the pressure is under the sat uration 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 ilOgas system is summerized at the end of this paper.