含蜡原油凝点与倾点的关系

The Relationship between Gel Point and Pour Point of Waxy Crude

我国一直以凝点作为控制原油输送温度的一个重要参数,而国际上普遍采用倾点。从测试对象、油样是否失去流动性的判据、测试前试样的处理条件、降温程式等几方面分析对比了现行凝点和倾点测试标准,并进行了含蜡原油凝点和倾点的对比试验。结果表明,由于凝点和倾点测定在试验程序上存在一定的差异,同一油样的凝点和倾点测试结果并不是一般认为的“差3℃”那么简单。在84组凝点、倾点测定结果的基础上,建立了原油倾点与凝点的经验关系式。

Both gel point and pour point are widely used to evaluate lowest temperature of flowability for crude oil. Gel point is mainly used in China for controlling pipelining temperature, while pour point is internationally used. In this paper, comparisons were made between the testing standards of both gel point and pour point in such aspects as test object,criterion,treatment condition,and cooling procedure. The comparison experiments between gel point and pour point of waxy crude have also been carried out. The results show that the relationship between gel point and pour point for the same waxy crude sample is nearly linear rather than a difference of 3℃ which has been traditionally regarded, since there exit somewhat differences in testing procedure (tilt method) between the two standards. An empirical correlation between gel point and pour point of waxy crude has been put forward based on the experimental results.