Surfactant composition for oil extraction in oil field and preparation method thereof

The technology of a surfactant and a composition is applied in the field of preparation of surfactants for oil recovery, and can solve the problem that the oil recovery environment cannot be widely used in different environments, the stability of the oil displacement system is insufficient, and the oil displacement agent or the recovery factor of the surfactant is not obtained. To a large extent, problems such as improvement

Active Publication Date: 2021-04-20
河北峻极化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the recovery factor of the above-mentioned oil displacement agents or surfactants has not been greatly improved, and they ca

Method used

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  • Surfactant composition for oil extraction in oil field and preparation method thereof
  • Surfactant composition for oil extraction in oil field and preparation method thereof
  • Surfactant composition for oil extraction in oil field and preparation method thereof

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preparation example Construction

[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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Abstract

The invention provides a surfactant composition for oil extraction in an oil field and a preparation method thereof. A pH responsive surfactant of which the charge can be reversibly converted under a preset pH value and of which the type can be converted among three anionic-amphoteric-cationic surfactants is compounded with a surfactant auxiliary agent formed by mixing conventional mesoporous silica nanoparticles and hydrophobic mesoporous silica nanoparticles; and the surfactant composition for oil extraction in the oil field is obtained, wherein the surfactant composition has high stability, can realize rapid demulsification, can disperse large oil drops into small oil drops, and can intelligently regulate and control the stability, particle size and flowability of the oil drops. By utilizing the mutual synergistic effect of the pH response type surfactant and the auxiliary agent mesoporous silica nanoparticles, the conversion among different surfactant types in the same oil displacement system can be realized, the surfactant composition can be widely applied to different oil extraction environments, and the crude oil recovery ratio is comprehensively improved by utilizing the conversion among different types of surfactants.

Description

technical field [0001] The invention relates to the technical field of preparation of surfactants for oil recovery, in particular to a surfactant composition for oil recovery in oil fields and a preparation method thereof. Background technique [0002] The main role of surfactants in enhanced oil recovery is to reduce the interfacial tension between displacement fluid and crude oil and improve the wettability of reservoirs. Since surfactants have both lipophilic (hydrophobic) and hydrophilic (oleophobic) properties, when the surfactant is dissolved in water, the molecules are mainly adsorbed on the oil-water interface, which can significantly reduce the oil-water interfacial tension. The reduction of oil-water interfacial tension means that the surfactant can overcome the cohesive force between crude oil and disperse large oil droplets into small oil droplets, thereby increasing the throughput rate of crude oil flowing through pore throats. The oil displacement effect of su...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 张红娟周圣杨欢
Owner 河北峻极化工科技有限公司
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