两性表面活性剂与纳米材料复配体系研究

Study on the compound system of amphoteric surfactant and nano materials

纳米材料为开发新型高效驱油体系提供了新思路。将芥酸酰胺甲基哌嗪丙磺酸盐(EDPS)与不同纳米材料混合,评价了各类复合体系的界面活性及黏度变化,并得出了EDPS与不同纳米材料的作用机理。进一步研究了低浓高黏高界面活性的EDPS/氧化石墨烯(GO)复合体系,并就其耐温性、耐盐性及抗老化性进行实验。结果表明,在高温(90℃)、高盐(50000 mg/L)及高钙镁离子浓度(1000 mg/L)下,EDPS/GO复合体系均能保持较高的黏度(>30 mPa·s)且维持界面张力在10^-2mN/m数量级。即使进一步老化90 d后,体系仍然表现出良好的稳定性。室内模拟驱油实验证实了该体系具有极佳的提高采收率能力。

Nanomaterials provide new ideas for the development of efficient oil displacement systems.We mixed N-erucamidopropyl-N,N-piperazine-N-methyl ammonium propanesulfonate(EDPS)with different nano-materials and explained their interfacial activity and viscosity by adsorption mechanism of EDPS with different nano-materials.The mixed EDPS/graphene oxide(GO)system with low concentration,high viscosity and high interfacial activity was further obtained.Further,experiments were conducted on its temperature resistance,salt resistance and aging resistance.The results showed that under high temperature(90℃),high salt(50000 mg/L)and high calcium and magnesium ion concentration(1000 mg/L),the mixed EDPS/GO system can maintain a high viscosity(>30 mPa·s)and maintain the interfacial tension in the order of 10^-2mN/m.Even after 90 days of aging,the system still showed good stability.Flooding tests have proved that this system has excellent ability to improve oil recovery.