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US 9,540,559 B2Granted
Betaine surfactants and preparation methods and uses thereof
AssigneePetroChina Company Limited
InventorsChunde Liu, Shiyi Yuan, Demin Wang, Xinmin Song
Life of this patent
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Abstract
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.
Claims11
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
Dependencies are inferred from the claim text.