Surfactant composition for oil field recovery and preparation method thereof
A technology of surfactants and surface modifiers, applied in the field of preparation of surfactants for oil recovery, which can solve the problem of insufficient stability of the oil displacement system, and the recovery rate of oil displacement agents or surfactants has not been greatly improved , Can not be widely applied to different environmental oil recovery environment and other issues, to achieve the effect of enhancing recovery, reducing adsorption, and improving utilization
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[0037] The invention provides a preparation method of a surfactant composition for oil recovery in an oil field. see figure 1 Shown, the preparation method of described pH responsive surfactant, comprises the steps:
[0038] S1, put 10-bromodecanoic acid, acetone and excess dimethylamine aqueous solution in a reaction kettle, react at room temperature for 12 to 24 hours, and then perform rotary evaporation treatment to obtain an intermediate product;
[0039] S2, adding an aqueous solution of sodium bicarbonate to the intermediate product, stirring for 10-30 min, and then performing rotary evaporation treatment to obtain a crude product, which was recrystallized in the first solvent to obtain 10-tertiary amine decanoic acid;
[0040] S3, dissolving the 10-tertiary amine decanoic acid in ethanol, adding sodium hydroxide solution at 20-30°C, stirring for 2-5 hours, adding acetonitrile to precipitate the reaction product, and then, putting the reaction product in the second Rec...
Embodiment 1
[0050] Example 1 of the present invention provides a surfactant composition for oil recovery in oilfields, which is compounded by mesoporous silica nanoparticles and pH-responsive surfactants; Porous silicon dioxide nanoparticles and hydrophobically modified mesoporous silicon dioxide nanoparticles are compounded to form surfactant additives.
[0051] The preparation method of described pH response type surfactant, comprises the steps:
[0052] S1, 5g of 10-bromodecanoic acid, a small amount of acetone and excess dimethylamine aqueous solution were placed in a reaction kettle, reacted at room temperature for 18h, and then performed rotary evaporation at a speed of 200r / min to obtain an intermediate product;
[0053] S2, add the sodium bicarbonate aqueous solution that concentration is 0.5mol / L to described intermediate product, stir 30min, carry out rotary evaporation treatment with the rotating speed of 200r / min again, obtain crude product, described crude product is in ethan...
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