基于静态实验的稠油低温氧化影响因素评价

Influence Factors of Low-temperature Oxidation of Heavy Oil Based on Static Experiment

为了提高稠油火驱高温氧化的持续性,获得稠油氧化内在反应机制,保障燃烧顺利启动,对辽河油田某火驱试验区稠油油样进行静态反应釜低温氧化实验,研究了原油组分、温度、压力和含水饱和度等对低温氧化反应的影响,并用灰色关联法对氧化影响因素进行了评价。结果表明,原油中饱和烃和芳香烃的含量较高时,有利于原油低温氧化反应进行;随着温度上升,稠油低温氧化速率提高,尤其在170℃之后,增速明显增大;氧气分压升高,在相同的接触面积上有利于稠油低温氧化反应的进行;随着含水饱和度的增大,氧化反应程度呈下降趋势。用关联分析法对稠油低温氧化影响因素的排序表明,温度是影响低温氧化反应的首要因素。

In order to improve the persistence of high temperature oxidation during fire flooding,obtain the oxidation reaction mechanism of heavy oil,and ensure the smooth start of combustion,a series of static experiments of low temperature oxidation were carried out on heavy oil sample from a fire flooding test area of Liaohe oilfield. The effect of oil composition,temperature, pressure and water saturation on low temperature oxidation reaction were studied. The grey correlation method was used to evaluate the influence factors of oxidation. The results showed that high content of saturated and aromatic hydrocarbons in crude oil was contribute to the low temperature oxidation of crude oil. The low-temperature oxidation rate increased with increasing temperature. Especially after 170℃ ,the rate of growth increased significantly. High oxygen partial pressure promoted the reaction of low-temperature oxidation,because oxygen concentration increased on the same interface. As the water saturation increased,the degree of oxidation reaction showed a downward trend. Finally,the influence factors of low temperature oxidation were sorted by Gray correlation method. And temperature was the primary influenced factor of low temperature oxidation reaction.