空气泡沫驱氧化机理实验研究

Experimental research on oxidation mechanism of air foam flooding

空气泡沫驱是一种特别适合低渗透油藏提高原油采收率的技术,它不仅具有一般注气的作用,而且还具有氧化反应产生的其它效果。但是如果注入空气中的氧与原油反应不充分,在原油中O2与甲烷气体的含量达到爆炸所需的有效浓度时,就有可能发生爆炸现象。因此,O2的含量是决定注空气泡沫工艺成败的关键因素。本文通过空气氧化静态实验,模拟原油在不同温度下的低温氧化过程,研究原油与空气接触后的氧化速率、含氧量及原油组分的变化,并分析了影响原油低温氧化反应的因素,为现场注气安全性的分析提供了理论基础。

The air foam flooding is a kind of technology to enhance oil recovery that is especially suitable for low permeability reservoir. It not only has the general gas injection effect,but also has the effect of oxidation reac-tion. If oxygen react with crude oil inadequately,it may explode when the content of oxygen and methane in the crude oil has achieved to effective concentration needed for the explosion. Therefore,the content of oxygen is the key factor that decide the success or failure of the air foam injection process. By air oxidation and static experi-ment,this paper studied the low temperature oxidation process of simulated oil at different temperatures. We stud-ied the oxidation rate of crude oil after contact with air,oxygen content,and the change of the composition of crude oil and analyzed the factors influencing the crude oil of low-temperature oxidation reaction. These provides a theoretical basis for the safety of gas injection for the scene analysis.