稠油粘滞粘度与粘滞点确定方法研究

Research on the method for determining the nonflowing viscosity and temperature of heavy oil

为了能够将稠油的低温流动性依然用类似于含蜡原油的凝点表示,同时又避免难以界定流动变形的问题,通过分析人眼在明视距离所能分辬的最小形变,提出了稠油粘滞点与粘滞粘度的概念。通过实验,确定了对应于试管倾斜至水平、观测时间为5 s条件下,稠油失去流动的粘滞粘度为1.165×105mPa·s,该粘度对应的温度为该稠油的粘滞点。实测结果表明,由粘滞粘度确定的粘滞点基本与实测粘滞点一致,粘滞点可以比较客观、准确地确定稠油的低温流动性。

In order to express the low temperature flowing of heavy oil just as the solidification point of waxy oil and avoid the difficulty in defining the flowing deformation, the non-flowing temperature and non-flowing viscosity of heavy oil are proposed through the analysis of minimum deformation that can be distinguished by human eyes. By the experi ments, it can be seen the non-flowing viscosity of heavy oil is 1. 165 × 10^5 mPa.s when the test tube is tilted and laid flat for 5 s, the temperature corresponding to the non-flowing viscosity is defined as the non-flowing temperature. Many experiment results show the non-flowing temperature corresponding to non-flowing viscosity is consistent with temperature measured when heavy oil don＇t flow. It means the non-flowing temperature can describe flow-ability in low temperature of heavy oil objectively and accurately.