阴离子型粘弹性表面活性剂基凝胶的制备和性能

Behavior of Viscoelastic Surfactant Based Gel

以油酸钾和氯化钾形成的粘弹性表面活性剂体系(VES-Y)为基础,在VES-Y中加入交联剂(N,N′-亚甲基双丙烯酰胺)和引发剂(Na2S2O8),在N2气保护下,于60℃下恒温24h,聚合得到阴离子型粘弹性表面活性剂凝胶(VES-G)。对VES-G和VES-Y体系的耐温、抗有机烃、破胶及对储层伤害等性能进行了室内评价。结果表明,VES-G体系的耐温和抗剪切性能得到大幅度改善,对有机烃的敏感性明显减弱,破胶后VES-G体系的性能与VES-Y体系基本一致;且通过岩心流动实验证实,VES-G体系对储层不存在伤害,渗透率保留率>99%。

The system of viscoelastic surfactant （VES-Y） was formed with potassium oleate and potassium chloride, and the viscoelastic gel （VES-G） was formed by the addition of a crosslinking agent （N, N′- methylene diacrylamide） and an initiator（ sodium supersulphate） to VES-Y and heated for 24 h at 60 ℃ under nitrogen. The properties of VES-Y and VES-G were evaluated in terms of temperature tolerance, shear thinning, sensitivity to hydrocarbon, breakdown and damage to permeability. The results showed that VES-G was less sensitive to hydrocarbon and had an improvement on its temperature tolerance and shear thinning. VES-Y and VES-G both exhibited the same breakdown propertities. In addition, VES-G showed no regained permeability over 99 percent after breakdown by core flow experiments.