Surfactant composition for enhanced oil recovery and preparation method thereof
A surfactant and recovery technology, applied in the field of surfactant composition, can solve problems such as poor oil displacement efficiency, corrosion equipment and pipeline demulsification difficulty, damage, etc., achieve high interfacial activity, improve oil displacement efficiency, The effect of avoiding harm
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Embodiment 1
[0023] Add sodium 2-pentadecyl-4-hydroxybenzenesulfonate and NaOH into the reaction kettle according to the molar ratio of 1:3, stir for 30 minutes, then add the required ethylene oxide, at 300 o C was reacted for 5 hours; then hydrochloric acid was added to neutralize to pH<3, and the layers were left to stand, and the oil phase was neutralized by adding 30% NaOH aqueous solution to obtain an anionic-nonionic surfactant.
[0024]Benzyltriethylammonium chloride and the anionic-nonionic surfactant prepared by the present invention were respectively dissolved in water, stirred for 30 minutes, and formulated into a 0.3% aqueous solution, and then the above-mentioned surfactant was mixed according to cationic:anionic-nonionic surface Active agent molar ratio 1:0.1 was mixed evenly to obtain surfactant composition 1, whose composition and structure are shown in Table 1.
Embodiment 2
[0026] Add sodium 4-octyl-2-hydroxybenzenesulfonate and NaOH into the reaction kettle according to the molar ratio of 1:2, stir for 30 minutes, then add the required ethylene oxide, at 150 o C and reacted for 20 hours; then adding hydrochloric acid to neutralize to pH<3, standing to separate layers, and adding ammonia water to the oil phase for neutralization to obtain an anionic-nonionic surfactant.
[0027] Decyltriethylammonium hydroxide and the anionic-nonionic surfactant prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and formulated into a 0.3% aqueous solution, and then the above-mentioned surfactant was mixed according to cationic: anionic-nonionic surface Active agent molar ratio 1:0.4 was mixed evenly to obtain surfactant composition 2, whose composition and structure are shown in Table 1.
Embodiment 3
[0029] Add sodium 4-hydroxybenzenesulfonate and NaOH into the reaction kettle according to the molar ratio of 1:3, stir for 30 minutes, then add the required ethylene oxide, at 160 o C was reacted for 25 hours; then hydrochloric acid was added to neutralize to pH<3, and the layers were left to stand, and the oil phase was neutralized by adding 30% NaOH aqueous solution to obtain an anionic-nonionic surfactant.
[0030] Dissolve phenyltrimethylammonium chloride and the anionic-nonionic surfactant prepared by the present invention in water respectively, stir for 30 minutes, and prepare a 0.3% aqueous solution, and then mix the above-mentioned surfactant according to cationic:anionic-nonionic surface Active agent molar ratio 1:0.8 was mixed evenly to obtain surfactant composition 3, the composition and structure of which are shown in Table 1.
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