利用表面活性剂降压增注提高采收率技术

EOR through depressurization and augmented injection with surfactant

在绝对渗透率难以改变的客观条件下,通过改变油、水及岩石间的界面张力,从而改善油、水渗流性,提高水相渗透率,降低低渗透油层注入压力,并在一些低渗透油田开展了低浓度活性剂降压增注试验研究,取得了一定的效果.室内实验结果表明,在岩心中注入表活剂体系,可以不同程度地降低注入压力,最好情况可以达到40%～60%.

Oil and water percolation properties can be improved and water permeability can be increased through changing interfacial tension between oil, water and rock, so as to lower injection pressure in low permeability reservoir. Experimental study of depressurization and augmented injection with surfactant of low concentration is carried out in several low permeability oilfields. Laboratory experiment results show that injection pressure can be lowered to some extent through injecting surfactant into core, with the maximum value of reduction in the range of 40% -60%.