| abstract |
The present invention relates to an anionic-cationic-nonionic surfactant essentially as shown in formula (I), a manufacturing method thereof, and an application thereof in tertiary oil recovery. The anionic-cationic-nonionic surfactant of the present invention shows significantly improved interfacial activity and stability compared to the prior art. Using the anionic-cationic-nonionic surfactant of the present invention, an oil displacement composition used for tertiary oil recovery and having improved oil displacement efficiency and oil washing capability compared to the prior art can be manufactured. Each group in formula (I) is as defined in the description. |