岩石孔隙中流体的相对渗透率是储层评价、油气田开发的关键参数之一,与流体性质、岩石的润湿性、孔隙结构等有关.一般通过稳态法与非稳态法实验获得.由于相渗实验的周期长、成本高,且条件较为苛刻,难以在现场中进行大量的应用.以Kozeny-Carman方程和阿尔奇公式为基础,将复杂的孔隙结构及流体分布进行简化,得到了毛管渗流中外油内水和外水内油状态下水相的相对渗透率模型.并通过G油田4块岩心的实验数据对模型进行了分析.研究表明:外油内水状态下的水相相对渗透率模型与孔隙中油水渗流规律相符,用该模型计算的水相相对渗透率与实测数据较为吻合.%Fluid relative permeability in porous rock is a key parameter in reservoir description and oil & gas field development, which are affected by fluid property, rock' s wetabillity, pore structure, etc. It is often got by steady and unsteady experiment method . Because the experiment spend long time and large cost, and it should have more rigorous experimenting conditions, the relative permeability can not have broadly application. The author simplified the complex pore structure and fluid distribution state base on Kozeny-Carman equation and Archie equation, got water permeability in W/O and O/W state formed by capillary percolation. The two models by four core experiments from G oilfield analyzed. The research demonstrated that W/O state is more applicable for percolation rule of fluid in porous rock and the water permeability calculated by W/O state model is more coincide with the experiment results.
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