注空气驱油室内实验研究

通过室内注空气动态驱油实验 ,模拟了原油在不同温度、不同注入压差等条件下的低温氧化过程 ,检测和分析了采出气体的含氧量变化 ,进一步研究了空气驱低温氧化机理。实验结果表明 ,在同一温度下 ,随着注入压差的增大 ,气体突破时间缩短 ,突破驱油效率及含氧量降低 ;在注入压差一定时 ,随着温度的升高 ,气体突破驱油效率增加 ,含氧量降低 ,低压差下气体突破时间延长 ,高压差下气体突破时间缩短。在低压差、高温油层中采用空气驱油 ,产出气体可控制在安全极限范围内。

Laboratary experiment on efficiency of air injection displacement

The process of low-temperature oxidization at different temperatures and pressures was simulated by air-injection displacement experiment in laboratory. The change of oxygen contents in produced gas was measured, and the mechanics of the low-temperature oxidization were investigated. The results of experiment showed that the time of gas breakthrough was shortened, and oil displacement efficiency and oxygen content in produced gas were reduced with increase of air-injection pressure at the same temperature. At the same pressure drop, oil displacement efficiency increased, and oxygen content in produced gas decreased with temperature rising. With the temperature rising, the time of gas breakthrough stortened at low-pressure gradient and delayed at high-pressure gradient. The safety of oil production using air-injection displacement technology in the low-pressure gradient and high-temperature reservoirs can be controlled.