空气/减氧空气驱氧气消耗规律分析

Investigation on the Oxygen Consumption Laws of Air/Oxygen-reduced Air Flooding Technology

齐桓 李宜强 王文东 韩继凡 闫茜 张佳乐 刘哲宇

QI Huan LI Yiqiang WANGWendong HAN Jifan YAN Xi ZHANG Jiale LIU Zheyu

为明确空气/减氧空气驱过程中氧气在储层内的消耗规律，采用静态氧化方法模拟了原油单因素及实际储 层条件下多因素氧化反应中氧气的消耗过程，定量表征静态氧化反应中氧气消耗程度；通过室内细长管空气驱 替实验分析了氧气沿程的动态消耗规律。结果表明，原油发生低温氧化反应消耗氧气造成体系总压力降低，碳 氢化合物发生加氧及断键反应生成CO2及CH4；模拟实际储层中的耗氧过程，计算得到发生低温氧化反应消耗氧 气占总消耗的87.84%，水中溶解氧气占比6.3%，地层水及岩心总消耗氧气占比5.86%；氧气沿程消耗，并观测到 氧化前缘的推进，较高的温度、压力及含油饱和度均会提高低温氧化反应程度，从而加剧氧气消耗。研究结果可 为实际矿场空气/减氧空气驱安全高效应用提供理论指导与帮助。

In order to clarify the law of oxygen consumption during air or oxygen-reduced air flooding，the static oxidation experiment was used to emulate the oxygen consumption process in single-factor and multi-factors oxidation reactions of crude oil under actual reservoir conditions，then quantitative characterization of the static oxygen consumption was obtained. What’s more， slimline air flooding experiment was performed to analyze the law of dynamic oxygen consumption on-way. The results showed that the oxygen consumption due to the low-temperature oxidation（LTO）reaction of crude oil would decrease the total pressure of the system. The oxygenation and bond-breaking reactions of hydrocarbon occurred to produce CO2 and CH4. As per the calculation from the process of oxygen consumption in actual reservoir stratum，oxygen of LTO consumption occupied 87.84% of the total consumption，dissolve in water occupied 6.3%，while oxygen consumption of the reducing substances in formation water and core was 5.86%. Moreover，consumption of on-way oxygen occurred，meanwhile the propelling in front of oxidation was observed. Relatively high temperature and pressure as well as the saturation of oil would intensify the degree of LTO，thus increasing oxygen consumption. The conclusion provided a reference and guidance to the safe and efficient application of air/oxygen-reduced air flooding in the reservoir.

10.19346/j.cnki.1000-4092.2022.04.016