三次采油用烷基苯磺酸盐结构与性能的关系研究

Relationships between structure to properties of alkylbenzene sulfonate surfactants and EOR

通过合成不同结构的系列烷基苯磺酸盐，研究了不同结构烷基苯磺酸盐与烷烃、原油的界面活性，结果表明：表面活性剂的分子结构(碳链长度，取代基大小，苯环位置)均对油水界面活性有很大影响，并且具有一定规律。研究了弱碱体系不同结构表面活性剂的油水界面活性规律，通过对烷基苯原料的大量筛选以及磺化合成工艺的优化，合成出适合我国石蜡基原油(以大庆原油为代表)、中间基原油(以大港原油为代表)的弱碱体系的烷基苯磺酸盐主剂配方SY-D1和SY-G2，合成的烷基苯磺酸盐主剂配方能在较宽的Na2CO3浓度范围(对大庆油水浓度为0．4％～1．0％，对大港油水浓度为0．2％～1．0％)和活性剂浓度范围(对大庆油水为0．025％～0．2％，对大港油水为0．05％～0.3％)与厚油形成超低界面张力，其稀释能力强、用量少。

Interfacial tensions at model oil/water interface and crude oil/formation water interface were studied by synthesizing a serious of alkylbenzene sulfonate surfactant with different structures. The tests show that the molecular structure, such as carbon length, different substituent group and position of benzene ring, exerts a great effect on interfacial property. The prescription of combination flooding in weak alkali condition is gained for wax-based crude oil and middle-based crude oil.