关键词: 多功能酸性压裂液, 阴离子表面活性剂, 黏弹性, 摩阻, 地层保护

Abstract:

The multi-function fracturing fluid (MF-VES)is an anionic visco-elastic surfactant and is obtained by cross-linked in the strong acid or weak acid.The MF-VES has the properties of VES fracturing liquid,such as low viscosity,high elasticity and shearing resistance under the condition of the proportion of 5 % HCl+10 % CH₃OH+6.5 % MF-VES+0.5 % YH-2,so it has such advantages as low friction,low fluid loss,high propo-carrying capacity and no damage to formation.The evaluation experiments indicate that MF-VES will do less damage to the fracturing equipments and pipe strings using YH-2 as corrosion inhibitor than other inhibitors.The fracturing process using MF-VES is an acidizing process simultaneously.The pollution near the fractured wells can be cleaned out.Meanwhile,the damages of particle motion and plastic strain of matrices near cracks can also be relieved.The permeability near cracks can be enhanced.A high-permeability zone can be created around the artificial cracks with high transmissibility.The damage caused by fracturing can be completely avoided.

Key words: multi-function acid fracturing fluid, anionic surfactant, visco-elastic property, friction, formation protection