Reverse demulsifier and its preparation method

A reverse-phase demulsifier and reaction technology, applied in the field of petroleum industry, can solve the problems of high oil content in the water phase and clogged filter with sludge, and achieve the effect of low equipment requirements, no high temperature and high pressure reaction, and good demulsification effect

Active Publication Date: 2013-12-25
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1. 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. After reacting at 70°C for 4 hours, the temperature is raised to 90°C~95°C and reacted for 24 hours to obtain linear polyamide-amine; drop 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, then heat to 65°C for 1 hour, and distill under reduced pressure to remove water to obtain linear polyamide-amine quaternary ammonium salt JXY01; The molar ratio of ester to ethylenediamine is 1:1, and the mass ratio of polyamide-amine to epichlorohydrin is 12:10.

[0023] (2) Synthesis of amphiphilic cationic polymer

[0024] Using nonylphenol as the initiator, the alkoxylation reaction with ethylene oxide is carried out under the catalysis of potassium hydroxide at 120~130℃ and 0.2~0.4MPa to obt...

Embodiment 2

[0028] Example 2. 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. After reacting at 70°C for 4 hours, the temperature is raised to 90°C~95°C and reacted for 24 hours to obtain linear polyamide-amine; drop 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, then heat to 65°C for 1 hour, and distill under reduced pressure to remove water to obtain linear polyamide-amine quaternary ammonium salt JXY02; The molar ratio of ester to ethylenediamine is 1:1, and the mass ratio of polyamide-amine to epichlorohydrin is 50:3.

[0031] (2) Synthesis of amphiphilic cationic polymer

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

Embodiment 3

[0036] Example 3. Synthesis of inverse demulsifier C

[0037] The linear polyamide-amine quaternary ammonium salt JXY01, the amphiphilic cationic polymer LYJ01, and the cationic surfactant dodecyltrimethylammonium bromide are dissolved in water to obtain inverse demulsifier C; among them, the linear polyamide- The mass ratio of amine quaternary ammonium salt, amphiphilic cationic polymer, cationic surfactant and 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 a reverse phase demulsifier and a preparation method thereof, and belongs to the technical field of the petroleum industry. Background technique [0002] Some domestic oilfields have entered a high water-cut development period. With the application of stimulation technologies such as chemical flooding, steam flooding, and profile control technology, the produced fluid has changed from the W / O type at the initial stage of oilfield development to the O / W type or W / O / W type. Residual agents in the produced fluid, such as alkali, surfactant and polymer, increase the stability of oil-water emulsion and increase the difficulty of processing the produced fluid. The treatment of tertiary oil recovery fluid has become a problem that plagues oilfield development. In a broad sense, O / W produced fluids are mainly composed of slick oil, dispersed oil, emulsified oil and trace amounts of dissolved oil, among which emulsified oil is the most dif...

Claims

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Application Information

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