直链烷烃动力黏度与声速关系研究

The Relationship between Viscosity and Sound Velocity of Straight-Chain Alkanes

目前用于原油黏度预测的计算模型需要测定的物性数据较为复杂,计算精度和适用范围有限。因此,实验中选取了几种具有代表性的直链烷烃作为模拟原油中烃类组分的模型化合物,分别测定了在不同温度、压力条件下的黏度和声速数据,考察了温度、压力对直链烷烃声速的影响规律,并建立了相应的黏度-声速关联模型。结果表明,直链烷烃的声速随温度增加而减小,随压力增加而增加,且声速与温度、压力均为线性关系。直链烷烃的黏度与声速为指数型对应关系。通过冀东油田3种不同原油对黏度-声速关联模型进行检验,计算结果表明适用性较好,从而为解决常规原油黏度计算对物性参数的高度依赖提供了一个可行的新方法。

The calculation models for crude oil viscosityare complex because of the determination of physical data,the limited calculation accuracy and application scope. Consequently, some representative straight-chain alkanes were taken as model compounds of crude oil, and their viscosity and sound velocity were measured under different temperatures and pressures in this work. The influences of temperature and pressure on the sound velocity of straight-chain alkanes were investigated, and the correlation model between viscosity and sound velocity was built on the base of experimental results. The experimental results indicated that the sound velocity of straight-chain alkaneslinearly decreased with the increase of temperature and the decrease of pressure. The relationship between viscosity and sound velocity of alkanes was exponential type, and the viscosity-sound velocity correlation model was applied to three different oils in Jidong Oilfield. The calculation results demonstrated a satisfactory applicability of the model. So, a feasible method was provided to reduce the dependence of conventional viscosity models on the physical property parameters.