Alkali-free binary compound flooding composition and application in chemical flooding
A binary compound flooding and composition technology, which is applied in drilling compositions, preparation of organic compounds, organic chemistry, etc., can solve difficult and ultra-low interfacial tension, aryl alkyl betaine and octadecyl hexyl The preparation process of carboxybetaine is complicated, and it is difficult to obtain large-scale industrial raw materials, etc., to achieve the effects of excellent oil-water interface properties, large critical micelle concentration, and good practicability
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Embodiment 1
[0058] This embodiment provides a dodecyl dipentyl propyl sulfobetaine (code name: C12-5S), and the specific preparation steps are:
[0059] (1) Add the aqueous solution of sodium 3-bromopropylsulfonate to di-n-pentylamine at 10°C, then react at 35°C for 3 hours to obtain a mixed solution; concentrate the obtained mixed solution, and then add Ethanol was dissolved, and the insoluble white solid was filtered off while hot, and the obtained filtrate was cooled to crystallize, suction filtered, and recrystallized to obtain the intermediate tertiary amine 3-(N,N-dipentylamino)propanesulfonate sodium;
[0060] Wherein, the ratio of the amount of sodium 3-bromopropylsulfonate to di-n-pentylamine is 1:2.5;
[0061] (2) Dissolve the intermediate tertiary amine 3-(N,N-dipentylamino)propanesulfonate sodium and n-chlorododecane obtained in step (1) in n-butanol, and then react at 110°C for 25 hours, the crude product was obtained, and ethyl acetate was added to dissolve it, and the unre...
Embodiment 2
[0064] This embodiment provides a tetradecyl dipropyl hydroxypropyl sulfobetaine (code name: C14-3S), the specific preparation steps are:
[0065] (1) Add an aqueous solution of 3-chloro-2-hydroxypropanesulfonate to di-n-propylamine at 5° C., then react at a temperature of 30° C. for 2.5 hours to obtain a mixed solution; concentrate the obtained mixed solution, Then add ethanol to dissolve, filter off the insoluble white solid while hot, and cool the obtained filtrate to crystallize, suction filter, and recrystallize to obtain the intermediate tertiary amine 3-(N,N-dipropylamino)-2-hydroxypropanesulfonate Sodium acid, its NMR spectrum is as follows figure 1 shown;
[0066] Wherein, the ratio of the amount of the sodium 3-chloro-2-hydroxypropanesulfonate to di-n-propylamine is 1:2.5;
[0067] (2) Dissolve the intermediate tertiary amine 3-(N,N-dipropylamino)-2-hydroxypropanesulfonate sodium and n-tetradecane bromide obtained in step (1) in n-butanol, and then Reaction at hig...
Embodiment 3
[0070] This embodiment provides a kind of octadecyl diethyl carboxybetaine (code name: C18-2C), and the specific preparation steps are:
[0071] (1) Add an aqueous solution of 2-chloroacetate sodium to diethylamine at 8°C, then react at a temperature of 35°C for 3 hours to obtain a mixed solution; concentrate the obtained mixed solution, then add ethanol to dissolve, The insoluble white solid was filtered off while hot, and the obtained filtrate was cooled to crystallize, suction filtered, and recrystallized to obtain the intermediate tertiary amine 3-(N,N-diethylamino)sodium acetate;
[0072] Wherein, the ratio of the amount of sodium 2-chloroacetate to diethylamine is 1:2.5;
[0073] (2) Dissolving the intermediate tertiary amine 3-(N,N-diethylamino) sodium acetate and n-chlorooctadecane obtained in step (1) in n-butanol, and then reacting at 120° C. for 30 hours, Obtain the crude product, then add ethyl acetate to dissolve, and remove the unreacted organic salt (sodium 2-c...
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