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Objective The performances of fluorinated surfactants by introducing fluorinated segments into sutfactants were studied. Methods Maleic anhydride, dodecyl primary amine, hexamethylene diisocyanate (HDI), perfluorobutyl ethanol and sodium bisulfite were used to synthesize wetting and emulsifying fluorinated surfactants( EFS). The structure of EFS was characterized by FTIR and ' HNMR. The wettability, emulsifying and oil displacement properties of EFS were investigated. Results The EFS can effectively improve the wettability and change the oil-wet glass surface into neutral surface, showing wetting reversal properties. Besides, the emulsification and solubilization performance indicated that 0.2% EFS has good emulsifying properties for crude oil. Moreover, the EFS presented good oil displacement performance, and more than half of crude oil in capillary can be driven out when the concentration of EFS was 0. 2% within 24 hours. Meanwhile, the larger angle between capillary and bottle bottom, the easier the crude oil is driven out. [ABSTRACT FROM AUTHOR]

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