低渗透油藏渗流物理特征的几点新认识

Some New Ideas on the Physical Characteristics of Seepage in Low Permeability Reservoirs

在低渗透油藏中,岩石湿润程度和原油与水之间的界面张力以及孔喉比对原油的产量和开采率有很大的影响,并且湿润角和湿润指数通过毛管准数和驱油的效率之间有一定的定量关系。针对修正毛管数的概念提出了界面张力还有湿润性以及孔喉比,而它们三者之间都有一定的关联。通过建立以Amott为基础的湿润指数的湿润角表达方法从而对低渗透储存毛管准数的相关表达式进行推导,同时结合岩心实验对毛管准数和残余饱和度之间的关系进行确定。

The interracial tension between oil and water in low-permeability reservoirs and the ratio of pore-throat ratio to the yieldand exploitation of crude oil have a great influence, and the wetting angle and wetting index are affected by capillary and flooding Thereis a certain quantitative relationship between the efficiency.There are some correlations between the interfacial tension and the wettabilityand the pore throat ratio for the concept of the modified capillary number.The relationship between the capillary count and the residualsaturation is determined by establishing the expression of the wetting index based on Amott＇s wetting index, and then deducing thecorrelation expression of the low permeability storage capillary.