Betaine surfactants and preparation methods and uses thereof

摘要

Betaine surfactants of formula (I) and preparation methods and uses thereof are provided. The surfactant can decrease the interfacial surface tension of crude oil till 10−3 mN/m, have the capabilities of antiheating (130° C.), antimineralizing and antidiluting, and can be used in the field of tertiary oil recovery.;

主权项

1. A betaine surfactant of formula (I):wherein m and n are integers of 2-10, R1 is H or alkyl, R2, R3 and R4 are independently alkyl, and X is selected from the group consisting of