不同测试条件下原油流变性实验研究

利用RV2 0旋转粘度计和原油渗流流变性测试仪 ,在不同条件下对 4种脱气原油的流变性进行了测试。结果表明 ,用 3种不同测试方法测得的原油视粘度明显不同 ;用旋转粘度计测试的视粘度最低 ;毛细管内的原油粘度次之 ;多孔介质内渗流时原油的视粘度最高。原油在多孔介质内渗流时 ,渗透率越低 ,原油视粘度越高 ,并且表现出非牛顿流体特性及存在着初始压力梯度。原油组分、试验温度、岩石孔隙结构等因素对原油的流变性影响最大 ,采用天然岩心测试地层条件下原油的流变性 ,其测试结果对油田开发才有指导意义

Experimental investigation on rheological characteristics of oils under different measuring conditions

The rheological characteristics of four kinds of degassed oils were investigated with three different methods under different conditions. The results showed that the apparent viscosities tested by three methods were evidently different. The viscosity tested by RV20 rotary viscometer is the smallest, and the viscosity in capillary is second, and that of oil flowing through the porous media set is the biggest. While oil flows in the porous media, the lower the rock permeability is, the higher the apparent viscosity of oil will be. At the same time, oil shows the non-Newtonian fluid characteristics and there exists an original pressure gradient. The oil composition, testing temperature and structure of porous media are the most important factors affecting the rheological characteristics of oils. It is suggested that rheological characteristics of underground oils can be tested by means of natural rocks, and the tested results could be of benefit to oilfield development.