摘要
目的阴离子-非离子型表面活性剂具有改变岩石表面润湿性的能力,然而其降低油水界面张力能力有限。因此,对其复配一种助表面活性剂以实现油水与油固界面协同调控,旨在解决残余油开发困难的问题。方法通过Williamson成醚反应,在非离子表面活性剂月桂酸二乙醇酰胺分子中引入磺酸根基团,合成强润湿调控主表面活性剂——月桂酸乙醇酰胺磺酸钠(HLDEA)。以降低油水界面张力为指标,复配表面活性剂壬基酚聚氧乙烯醚硫酸钠(NPES),得到最佳强化润湿高效驱油体系。对其降低油水界面张力性能、润湿调控性能、油膜剥离性能及驱油性能进行评价。结果质量分数为0.3%的HLDEA+NPES体系可将油水界面张力降低至3.8×10^(-3)mN/m,达到超低界面张力。此外,HLDEA+NPES分子可吸附至亲油岩石表面,将亲油岩心表面水下油滴接触角由41.34°增至162.53°,将疏水岩石表面调控为水下强疏油状态。75℃下,经HLDEA+NPES体系处理24 h,载玻片表面油膜面积减少75.3%,实现油膜整体剥离。结论室内岩心动态驱油实验结果表明,HLDEA+NPES体系可将采收率提高至63.60%,在水驱基础上提高了28.74个百分点,在超低界面张力体系驱基础上提高了7.80个百分点。HLDEA+NPES体系可同时达到超低界面张力和调控岩石表面润湿性,具有应用潜力。
Objective Anionic-nonionic surfactants have the ability to change the wettability of rock surface,but their ability to reduce oil-water interfacial tension is limited.Therefore,a cosurfactant is compounded to achieve synergistic regulation of oil-water and oil-solid interface,aiming to solve the difficulty of residual oil development.Method Through the Williamson etherification reaction,a sulfonic acid group was introduced into the nonionic surfactant lauric acid diethanolamide to synthesize an enhanced wetting-regulated cosurfactant—lauric acid ethanolamide sulfonate(HLDEA).With the reduction of oil-water interfacial tension as the index,the surfactant nonylphenol polyoxyethylene ether sodium sulfate(NPES)was compounded to obtain the best enhanced wetting highefficiency oil displacement system.The oil-water interfacial tension reduction performance,wetting control performance,oil film peeling performance and oil displacement performance were evaluated.Result The 0.3 wt%HLDEA+NPES system could reduce the oil-water interfacial tension to 3.8×10^(−3)mN/m,which achieved ultra-low interfacial tension.Meanwhile,HLDEA and NPES molecules could be adsorbed to the surface of lipophilic rock,and the underwater oil contact angle increased from 41.34°to 162.53°,which regulated the surface of hydrophobic rock to a strong underwater oleophobic state.At 75℃,the oil film area on the surface of the slide was reduced by 75.3%after HLDEA+NPES system treatment for 24 h,and the overall peeling of the oil film was realized.Conclusion The results of indoor core dynamic oil displacement experiments showed that HLDEA+NPES system could increase the recovery rate to 63.60%,which increase by 28.74 percentage points on the basis of water flooding and 7.80 percentage points on the basis of ultra-low interfacial tension system flooding.The HLDEA+NPES system can simultaneously achieve ultra-low interfacial tension and wetting control of rock surfaces,which has practical application potential.
作者
刘长龙
刘敬平
邹剑
李琳
金晓
孙玥
LIU Changlong;LIU Jingping;ZOU Jian;LI Lin;JIN Xiao;SUN Yue(Tianjin Branch of CNOOC Limited,Tianjin,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,China)
出处
《石油与天然气化工》
北大核心
2025年第1期88-94,共7页
Chemical engineering of oil & gas
基金
国家自然科学基金“超深层新型抗高温聚合物冻胶压裂液及耐温减阻机制”(52120105007)
国家自然科学基金面上项目“深层硼镐共修饰碳点交联压裂液制备及网洛剪切重构机制”(52374062)
国家重点研发计划资助项目(2019YFA0708700)。
关键词
助表面活性剂
润湿调控
界面张力
油膜剥离
提高采收率
cosurfactant
wetting control
interfacial tension
oil film peeling
enhanced oil recovery
