Reverse demulsifier and its preparation method

An inverse demulsifier and reaction technology, which is applied in the field of petroleum industry, can solve the problems of sludge clogged filter, high oil content in water phase, etc., and achieve the effect of low equipment requirements, no high temperature and high pressure reaction, and good demulsification effect

Active Publication Date: 2012-07-11
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the inverse demulsifiers used for O / W emulsion demulsification at home and abroad mainly include low molecular electrolytes, alcohols, surfactants and cationic polymers, etc. These agents are generally difficult to meet the requirements of chemical flooding production fluid treatment , showing high oil content in the water phase after treatment, or producing a large amount of sludge to block the filter

Method used

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  • Reverse demulsifier and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1, the synthesis of inverse demulsifier A

[0021] (1) Synthesis of linear polyamide-amine quaternary ammonium salt

[0022] At room temperature, slowly add methyl acrylate dropwise to ethylenediamine, react at 70°C for 4h, then raise the temperature to 90°C~95°C for 24h to obtain linear polyamide-amine; drip epichlorohydrin at 5°C Add it to a polyamide-amine aqueous solution with a concentration of 50% by mass, react at room temperature for 5 hours, raise the temperature to 65°C and react for 1 hour, and distill off water under reduced pressure to obtain the linear polyamide-amine quaternary ammonium salt JXY01; The molar ratio of the ester to ethylenediamine is 1:1, and the mass-number ratio of the polyamidoamine to epichlorohydrin is 12:10.

[0023] (2) Synthesis of amphiphilic cationic polymers

[0024] Using nonylphenol as the starting agent, carry out alkoxylation reaction with ethylene oxide under the catalysis of potassium hydroxide at 120-130°C and...

Embodiment 2

[0028] Embodiment 2, the synthesis of inverse demulsifier B

[0029] (1) Synthesis of linear polyamide-amine quaternary ammonium salt

[0030] At room temperature, slowly add methyl acrylate dropwise to ethylenediamine, react at 70°C for 4h, then raise the temperature to 90°C~95°C for 24h to obtain linear polyamide-amine; drip epichlorohydrin at 5°C Add it to a polyamide-amine aqueous solution with a concentration of 50% by mass, react at room temperature for 5 hours, raise the temperature to 65°C for 1 hour, and distill off water under reduced pressure to obtain the linear polyamide-amine quaternary ammonium salt JXY02; The molar ratio of ester to ethylenediamine is 1:1, and the ratio by mass and number of polyamidoamine to epichlorohydrin is 50:3.

[0031] (2) Synthesis of amphiphilic cationic polymers

[0032] Using nonylphenol as the starting agent, at 120-130°C and 0.2-0.4MPa, potassium hydroxide is used to catalyze the alkoxylation reaction with ethylene oxide to obtai...

Embodiment 3

[0036] Embodiment 3, the synthesis of inverse demulsifier C

[0037] Dissolve linear polyamide-amine quaternary ammonium salt JXY01, amphiphilic cationic polymer LYJ01, and cationic surfactant dodecyltrimethylammonium bromide in water to obtain reverse phase demulsifier C; among them, linear polyamide- The ratio of amine quaternary ammonium salt, amphiphilic cationic polymer, cationic surfactant to water is 30:17:3:250.

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Abstract

The invention discloses a reverse demulsifier and its preparation method. The method comprises allowing reaction between methyl acrylate and ethylenediamine to obtain linear polyamidoamine, and allowing reaction between the linear polyamidoamine and epoxy chloropropane to obtain quaternary ammonium salt of linear polyamidoamine; allowing free-radical polymerization between polyoxyethylene nonylphenyl ether acrylate, acryloyloxyethyltrimethylammonium chloride and acrylamide in the present of an initiator and a terminator to obtain amphipathic cationic polymer; and mixing the quaternary ammonium salt of linear polyamidoamine, the amphipathic cationic polymer, a cationic surfactant and water to obtain the reverse demulsifier. The inventive reverse demulsifier has good demulsification effect on oil-in-water emulsion produced from oil field, and is suitable for chemical flooding produced fluid; and the inventive preparation method has low requirement for equipment, and is free of high-temperature high-pressure reaction.

Description

technical field [0001] The invention relates to an inverse demulsifier and a preparation method thereof, belonging to the technical field of petroleum industry. Background technique [0002] Some oilfields in China have entered the high water-cut development period. With the application of chemical flooding, steam flooding and profile control technology, the production fluid has changed from the W / O type in the early stage of oilfield development to the O / W type or W / O / W type. Residual chemicals in the production fluid, such as alkali, surfactant and polymer, increase the stability of oil-water emulsion and increase the difficulty of production fluid treatment. The treatment of tertiary oil recovery fluid has become a difficult problem for oilfield development. In a broad sense, the O / W type produced fluid is mainly composed of slick oil, dispersed oil, emulsified oil and a small amount of dissolved oil, among which emulsified oil is the most difficult to treat. The inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C08G69/48C08F290/06C08F220/34C08F220/56
Inventor 檀国荣张健
Owner CHINA NAT OFFSHORE OIL CORP
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