胶凝含蜡原油屈服时间研究

STUDY ON YIELD TIME OF GELLED WAXY CRUDE OIL

针对胶凝含蜡原油的屈服规律问题,定量描述了应力加载速率与屈服时间之间的关系。在控制应力模式下,使用RS150流变仪对胶凝大庆原油、北疆原油和吐哈原油等3种含蜡原油进行了应力阶跃式加载和应力匀速加载两种作用方式下的屈服特性实验。发现对于胶凝含蜡原油,随应力加载速率的减小屈服时间单调增加,数据回归分析表明二者之间存在相关性很好的幂函数关系。在此基础上提出了描述胶凝含蜡原油应力加载速率与屈服时间之间的关系式,结合量纲分析对该式的物理意义进行了分析。利用国内外文献中的不同胶凝含蜡原油的实验数据对该式进行了验证,结果表明该式具有通用性。

In order to acquire the yield law of gelled waxy crude oil and quantitatively establish the relationship between stress loading rate and yield time,the yielding property of three types of gelled waxy crude oil,i.e.,Daqing gelled crude oil,northern Xinjiang crude oil and Tuha crude oil,are studied by using rheometer RS150 in controlled stress mode,with the stress loading in stepwise sequence and in a ramp-up way.It is found that the yield time of gelled waxy crude oil increases monotonically with the decrease of stress loading rate,the data regression analysis shows that the relationship between these two parameters follows a power law function.Based on the result,an expression that can describe the relationship between the stress loading rate and yield time of gelled waxy crude oil is developed,and the physical meaning of this expression is analyzed with dimensional analysis.The universalization of this expression is verified by fitting with different experimental data of gelled waxy crude oil from domestic and foreign literatures.