地层原油及其族组分的氧化反应特性研究

Oxidation behavior of formation crude oil and its group components

为了考察油藏注空气过程中地层原油的氧化反应规律,采用柱层析方法将地层原油组分分离为饱和烃、芳香烃、胶质和沥青质。采用热重和差示扫描量热仪,研究了原油和其不同族组分的氧化反应特性。结果表明,中原油田该区块原油差示扫描量热曲线第一放热区间峰值热流高于第二放热区间峰值热流,饱和烃和芳香烃的第一放热区间的峰值高于第二放热区间峰值,胶质和沥青质的第二放热区间峰值高于第一放热区间峰值,原油中饱和烃和芳香烃的含量较高时,有利于轻质油藏注空气过程中原油自燃现象的发生。原油的族组成对原油的氧化特性有决定性影响。

In order to research oil oxidation matics,resins and asphaltenes by liquid c behavior, oil was separated into fractions called saturates, arohromatography. The oxidation behaviors of crude oil and its （SARA） fractions were investigated using the thermal analysis techniques. Results showed that two distinctive exothermic activities were observed. For dead oil, saturates fraction and aromatics fraction,higher liberated heat from the oxidation reactions were observed in the low temperature range as compared to that in the high temperature range. For resins fraction and asphaltenes fraction, the heat generation in the low temperature range was lower than it in the high temperature range. Spontaneous ignition easily occured when the contents of saturate and aromatic were high. Group components had important effect on oxidation behavior of oil.