微压法测试含蜡原油倾点的适应性

Testing adaptability of waxy crude pour point by micro-pressure method

系统梳理了国内外测试油品倾点的标准规范,介绍了微压法测试倾点的原理以及自行研制的专利产品自动连续供样倾点测试装置。选取国内具有代表性的管输含蜡原油,设计了利用微压法对其进行倾点测试的适应性实验。根据实验研究结果,确定了微压法测试原油倾点的关键参数,加压脉冲取2400～3500imp,倾点判断值取0.07kPa,试样与冷阱温差取30℃。在该取值条件下,倾点测试结果与按照ASTMD5853-06原油倾点测量法测量的结果相差小于3℃。同时,国内主要含蜡原油,倾点越高,其流动性与热历史的相关性越高,因此设想通过倾点值定量表征油品流动性与其热历史的相关性,有待开展深入研究。(表2,图2,参8)

Domestic and foreign standards for oil pour point testing are systematically sorted and a description is provided for the principle of pour point testing by the micro-pressure method as well as automatic continuous sample supply pour point test device as a self-developed patented product. Domestic representative pipeline waxy crude is selected to design a compatibility test for pour point testing by the micro-pressure method. In accordance with experiment research results, key parameters of crude pour point testing by the micro-pressure method are determined, such as 2 400 imp to 3 500 imp of pressuring pulse, 0.07 kPa of pour point judgment value and 30 ~C of temperature difference between the sample and cold trap. Under the condition of the above values, there is a difference of less than 3 ~C between the pour point testing result and the result of testing by the crude pour point measurement method in ASTM D 5853-06. In addition, main domestic waxy crude follows a higher relevance between flowability and thermal history with improvement of the pour point. Therefore, in-depth studies shall be carried out on the idea of quantitatively representing the relevance between the oil flowability and thermal history by the pour point value. （2 Tables, 2 Figures, 8 References）