化学剂-气水交替驱(CWAG)研究进展

A Comprehensive Review on Chemically Enhanced Water Alternating Gas(CWAG)

CO_2驱作为一种强化采油(EOR)的技术获得了广泛的应用。但由于CO_2本身黏度过低,CO_2驱往往面临着驱替前缘不稳定和重力分离的问题。为了解决这一问题,发展出了气水交替驱技术(WAG)。近年来在WAG技术基础上进一步发展出了化学剂-气水交替驱技术(WAG)。介绍了CWAG技术的原理与优势,总结了CWAG从数值模拟到现场试验的发展过程。

CO2 flooding have been widely used for enhanced oil recovery（EOR）.But it often results in viscous fingering and gravity override due to the high mobility ratio caused by its low viscosity.To mitigate this problem alternate injection of water and slugs,known as the water-alternating-gas process（WAG）is widely applied.Recently,numerical simulation and experiments indicate that the use of chemicals in water slug can increasing the ultimate recovery.The principles and advantages of chemically enhanced water alternating gas（CWAG）were introduced briefly.And the development process of CWAG from numerical simulation to field test was revewied.