硫酸盐型孪连表面活性剂的界面性能研究

考察了自制的三种高纯度双直链烷基硫酸盐型孪连表面活性剂的界面性能和驱油性能。结果表明，双直链烷基硫酸盐型孪连表面活性剂的CMC在10-5~10-6mol/L之间；随着表面活性剂浓度的增加，界面张力达到平衡时所需要的时间明显延长；随着联接基团碳链长度的增加，油水界面张力先增大再减小；此类孪连表面活性剂具有非常好的抗一价盐二价盐的能力；用2C13-C2-2C2SO4Na作为驱油剂进行驱油实验时，可以使采收率在水驱基础上提高5%以上，具有比较好的驱油效果。

Study on the International Performance of Di-n-alkyl Disulfate Surfactants

The international performance and oil displacment were studied. Results showed that the CMC values were in the range of from 10-5 to 10-6 mol/L. The time expending to equilibrium interfacial tension extended with the increase of Geminis concentration. As the spacer length increased, the interfacial tension first increased to a certain point and then decreased. The Geminis displayed outstanding salt resistance. 2C13-C2-2C2SO4Na can enhance 5% EOR after water flooding as oil displacement agent in core flooding experiment.