稠油氧化阶段划分及活化能的确定

火驱是稠油蒸汽吞吐后的重要接替方法，而稠油氧化的反应阶段的划分对火驱点火乃至生产的调控影响重 大。采用热重实验对某油田稠油样品混合油砂氧化过程进行研究，绘制该稠油热失重速率曲线，呈多峰形态，结合稠 油多组分氧化理论进行氧化阶段的细致刻画，分解成低温氧化前期、低温氧化后期、燃料沉积段和高温氧化段共4 个 阶段，并明确定义了各阶段的分界点，与稠油常规认识的三阶段氧化规律相比，四阶段划分法更能刻画低温范围大、耗 时长，反应复杂的特点；用Flynn-Wall-Ozawa 法计算各阶段的反应活化能也与常规划分有较大区别。该认识对稠油火 烧油层点火阶段的热量供给具有的参考价值。

Division of Oxidation Stage of Heavy Oil in the Process of#br# in-situ Combustion

In-situ combustion is an important replacement method for heavy oil steam stimulation. The division of the reaction stage of heavy oil oxidation has great influence on the ignition of in-situ combustion and even production. Thermogravimetric（ TG）experiment was conducted to study the oxidation process of a certain heavy oil sample mixed with quartz sand， and the oxidation process was described in detail by combining the multi-peak shape of thermal weight loss rate curve with Multi-component oxidation theory of heavy oil，and four stages of weight loss were identified：earlier LTO（low temperature oxidation），later LTO，fuel deposition and HTO（high temperature oxidation），and the demarcation points were clearly defined. Compared with the conventional understanding of the three stage oxidation of heavy oil，the four stage method is more capable of describing the characteristics of low temperature range，long time consuming and complex reaction. The Flynn-Wall-Ozawa method is used to calculate the activation energy of each stage，which is quite different from that of the conventional division. The results have reference value for heat supply in ignition period of in-situ combustion of heavy oil reservoir.