轻质原油低温氧化动力学模型——以中原油田胡12块为例

Oxidation kinetics model in LTO process for light oil—a case of Hul2 block in Zhongyuan Oilfield

针对中原油田胡12块油样,在组分分析的基础上,利用物质平衡定律确定了反应方程式,通过原油静态氧化实验,研究了油样在油藏温度和压力下的氧化过程,基于简化的Arrhenius方程,确定了氧化反应的活化能和反应速率常数,并用键能法确定了反应焓,从而建立了低温氧化动力学模型,为注空气油藏数值模拟提供了理论基础。低温氧化实验结果还表明,实验温度越高,生成的二氧化碳量越大,氧气消耗速率也越大,110℃时氧气的消耗速率为80℃时的4倍,说明温度是影响低温氧化反应的重要因素。

Reaction equation was established by using the material balance law based on the component analysis of Hu12 block in Zhongyuan Oilfield.The oxidation process of the oil at reservoir temperature and pressure was studied by the static oxidation experiment of the oil.The activation energy and the pre-exponential constant of the reaction rate were calculated based on the simplified Arrhenius equation.The reaction enthalpy was determined by using a chemical-bond energy method.Therefore the LTO kinetics model was established to provide theoretical basis for the numerical simulation of air injection process.The results of LTO (low temperature oxidization) experiments show that the higher the temperature is,the more CO_2 is produced,and the higher the oxygen consumption rate is.The oxygen consumption rate at 110℃is 4 times higher than that at 80℃,which means the temperature is an important factor effecting on the LTO reaction.