密度法测量原油含水率的误差分析

ANALYSIS ONEKRORS IN MEASURING WATER CONTENT WITH DENSITY YMETHOD

对利用密度法测量原油含水率的误差进行了分析，建立了原油含水率的误差传递公式。详细讨论了含水串的高低、原油密度大小、混合密度误差、纯水和纯原油密度误差对含水率测量误差的影响．此外．还讨论了取样方式、温度和流态对该法的影响．研究认为该法测量原油含水率的适用范围是３０％～１００％，可达到的最好相对误差为１％左右。

This paper analyzed the errors of the density method used for measuring water contentin oil by using some methods in error theorv, The error trantsfer formulae for water content in oil wereestablished.It discussed in detail the effects on the error of the water content in oil caused by the mag-nitude of the water content in oil and pure oil dentsity,as well as the errors of the mixture of oil andwater, pure water and oil.Altso,the effects of sample method, temperature and fluid regime on thedensity method were discussed.It was pointed that the applicable range of the density method for measuring the water content in oil is 30%～100%,the best relative error of the method is about 1%。