阴阳离子微线团封堵能力实验研究

Experimental Study of the Sealing Capacity of Anion and Cationic Microcoil

关键词:  阴阳离子微线团  交替注入  封堵能力  耐冲刷性能  提高采收率

Key words:  anion and cationic microcoil  alternative injection  sealing capacity  washing resistance  enhance oil recovery

摘要:

针对低渗油藏,阴阳离子微线团交替注入有很好的封堵能力。通过室内岩心驱替试验,研究了单一注入阴离子微线团,单一注入阳离子微线团,阴/阳离子微线团交替注入,阳/阴离子微线团交替注入的封堵性能。研究结果表明:单一注入微线团与不同顺序的微线团交替注入对封堵能力有着显著的影响。其中阳/阴离子微线团交替注入在中高渗条件下能够形成有效的封堵能力,起到增加高渗透层流动阻力的作用,两个轮次封堵率可达到87.72%,具有良好的封堵作用,并有较好的耐冲刷性能。室内试验研究表明,可提高原油采收率达28%。

Abstract:

Alternative injection of anion microcoil and cationic microcoil has a nice sealing capacity in the low permeability reservoir.Laboratory experiments on the core displacement are conducted to evaluate the sealing capacity of microcoil,which have studied the sealing capacity of anion microcoil,cationic microcoil,alternative injection of anion microcoil and cationic microcoil,alternative injection of cationic microcoil and anion microcoil.The results indicate that injection mode have a significant impact on the sealing capacity.And alternative injection of cationic microcoil and anion microcoil can develop efficient sealing capacity in the hypertonic condition.This technology can enhance the flow resistance of high permeability layer,and have good plugging and washing resistance properties.The plugging rate reaches 87.72% after two alternative injections of microcoil.The result shows that it can enhance oil recovery efficiency by 28% after alternativing injection of microcoil.