管输改性原油凝点的测定

Determining the Solidification Point of Modified Crude Oil when Pipelining

测定原油凝点的方法有国标法、直接冷却法、熔化法和凝点法等四种。原油的凝点主要与其化学组分和热处理有关。通过试验表明,用不同的方法测得原油的凝点其结果不同。根据原油蜡晶的结构性质提出了不同的原油应采用不同的凝点测试方法进行测定,同时指出新疆原油和长庆原油以及蜡的结晶习性比较复杂的原油凝点采用熔化法测定;改性原油的室内试验采用直接法和凝点法测定,并建议尽快建立一种测定管道实际运行中的原油凝点测定方法。

There are GB method (the PRC standard) , direct cooling method, melting method and solidification point method employed to determine the solidification point of modified crude oil. The solidification point of crude oil is mainly related to its chemical compositions and heating methods. Experiments showed that the different solidification point of crude oil can be obtained with different determining methods. According to the wax crystal structure of crude oil,the appropriate methods should be selected to determine the solidification points of different crudes. The paper points out that the melting method is suitable for determining the solidification point of the oil with relatively complex crystal textures such as Xingjiang and Changqing oil,and the direct cooling method and solidification method should be employed to determine the solidification point of the modified crude oil at laboratory. It suggested that a method to determine the solidification point of crude oil during operating should be established as soon as possible.