注气压力对气驱驱油效率影响的实验研究

通过多组细管实验，研究塔里木油田某区块原油在模拟地层温度108℃下注气压力对气驱驱油效率的影响，分析了不同注入压力下气驱驱油效率和气体突破的影响。实验结果证实：随着注气压力、注气体积增加，气驱驱油效率增加且增幅较大，表明提高注气压力可以显著提高驱油效率；且CO2与原油间最小混相压力为35．1MPa。注气压力越大，气体与原油混相程度越高，气驱越接近活塞式驱替，气体突破时间越长。

Experimental study of the influence of gas injection pressure on oil displacement efficiency in gas flooding

Under the simulated formation temperature of 108℃, many slim - tube experiments were performed to study on the effects of gas injection pressure on oil displacement efficiency of gas flooding by using crude oil taken from a certain block in Tarim Oilfield. It was analyzed that various gas injection pressure affect on the oil displacement efficiency and gas breakthrough. The experimental results show that increasing gas injection pressure and gas injection volume, the oil dis- placement efficiency increases obviously. It is clear that increasing the injection pressure may significantly increase the dis- placement efficiency. The minimum miscible pressure between CO/and crude oil is 35.1 MPa. The bigger the gas injection pressure is, the higher the miscible degree between gas and crude oil is. The closer to the piston displacement the gas flood- ing is, the longer the gas breakthrough time is.