基于实验的原油氧化速率分析及应用

Analysis and Application of Crude Oil Oxidation Rate Based on Experiments

火烧油层作为一种利用燃烧重质组分加热地层以达到原油驱替的热力采油技术,热效率高且驱油效果明显,受到越来越多的关注。但目前火驱成功应用并不广泛,主要在于缺乏对火驱不同氧化阶段原油氧化速率认识,难以形成较为合理的注气速度,通过静态反应釜实验,测量低温阶段的压力随时间变化,进一步利用压降法计算出低温氧化反应速率,同时通过燃烧管实验,测量高温阶段反应前后的氧气含量的变化,根据气体状态方程得到高温氧化反应速率,并根据不同阶段的反应速率,结合火驱现场实际给出合理的注气速度,为后续火驱方案设计提供借鉴和指导。

As a type of thermal oil recovery technology by burning heavy components to heat and push oil motion underground, in-situ combustion reservoir has attracted more and more attention because of its high thermal efficiency and obvious oil-driven effect. However, successful application of the technology was limited at present mainly due to the lack of understanding of the oxidation rate in different oxidation stages, and it is difficult to form a reasonable design scheme of gas injection rate. Therefore, a static reactor experiment was performed to measure the pressure change with time in the low temperature stage, and the low-temperature oxidation reaction rate was calculated by the pressure drop method. At the same time, variation in the oxygen content before and after high temperature reaction were measured in the combustion tube experiment. The high-temperature oxidation reaction rate was obtained according to the gas state equation;and combined with the actual situation, reasonable gas injection rate was determined according to the reaction rate of different stages. This study may provide a reference and guidance for subsequent scheme design of the application.