稠油低温氧化反应综合特征及应用

Comprehensive Characteristics and Application of Low Temperature Oxidation of Heavy Oil

在火烧油层点火成功之前,稠油与氧气主要发生低温氧化反应。在某稠油油样静态低温氧化实验的基础上,结合原油氧化的7种方式,按照反应后气体含量分配各种氧化方式所占的权重,对稠油低温氧化的反应方程式进行了研究。结果表明,该油样的低温氧化反应方程式中O_2与CO_2的系数比为1.06:0.12,通过与稀油对比,认为稠油低温氧化过程中加氧反应占的比例高,即稠油发生加氧反应的活性高于稀油,并进行了火烧油层点火阶段的注气速率计算,得到辽河油田某区块点火阶段注气强度应大于571 m^3/d。

The Low temperature oxidation reaction is dominant before ignition of in-situ combustion inheavy oil. Based on the static experiment of low temperature oxidation and combined with the seven ways ofoil oxidation. Accorded to the gas content after reaction, the weights of various oxidation models wereassigned. The reaction equations of low temperature oxidation of heavy oil were studied. The results showedthat the coefficient ratio of O2 and CO2 was 1.06: 0.12 for the equation at low temperature oxidation reaction.Compared with the light oil, the proportion of oxygenation reaction was higher at low temperature oxidation.The heavy oil was more active in oxygenation reaction than light oil. Finally the gas injection rate in theignition stage for one area of Liaohe oilfield was calculated. The result showed that it should be more than571 m3/d.