石油化工2025，Vol.54Issue(3)：387-394,8.DOI:10.3969/j.issn.1000-8144.2025.03.013
一种阳-非离子复合表面活性剂解除反凝析污染的性能评价
Performance evaluation of a cationic-nonionic composite surfactant for removing retrograde condensate pollution
摘要
Abstract
Retrograde condensate pollution is currently one of the most serious damage types in the productivity of gas reservoirs.In order to relieve the retrograde condensate pollution in gas reservoirs,the surface activity and wetting modification ability of various single surfactant systems and an optimized cationic/nonionic(referred to as cationic-nonionic)composite surfactant system were investigated using a surface tensiometer and a contact angle goniometer.The critical micelle concentration(cmc),surface activity,wetting modification ability,liquid invasion prevention,and liquid invasion removal capacity of the composite surfactant system were studied through conductivity experiments,spontaneous core imbibition,NMR characterization and core flow experiments.Additionally,the synergistic effects between the cationic and nonionic surfactants in the composite surfactant system were examined.The experimental results show that both the surface activity and the wetting modification ability of the composite surfactant system are better than those of the single-surfactant systems,and the cmc of the composite surfactant system is significantly lower than that of the single-surfactant systems.After adding the composite surfactant system,the surface tension of the simulated formation water is only 18.7 mN/m,and the surface tension of the condensate oil is only 23 mN/m.After being treated by the composite surfactant system,the contact angle of the simulated formation water on the core surface is 110.0°,and the contact angle of the condensate oil on the core surface is 96.7°.The composite surfactant system can effectively prevent liquid invasion into the core and effectively relieve the damage caused by liquid invasion to the core.关键词
反凝析污染/表面活性/润湿改性/电导率/自发渗吸/岩心流动Key words
retrograde condensate pollution/surface activity/wetting modification/conductivity/spontaneous imbibition/core flow分类
石油、天然气工程引用本文复制引用
方静,方俊伟,劳胜华,潘丽娟,李微..一种阳-非离子复合表面活性剂解除反凝析污染的性能评价[J].石油化工,2025,54(3):387-394,8.基金项目
新疆维吾尔自治区"天山英才工程技术研发团队"项目(2022TSYCGC0003). （2022TSYCGC0003）
