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Reverse demulsifier and preparation method thereof

An inverse demulsifier and reaction technology, applied in the field of petroleum industry, can solve the problems of increasing the mechanical strength and negative charge of the oil-water interface film, and the difficulty of separating oil and water from chemical flooding production fluid, achieving good demulsification effect, low equipment requirements, Simple operation effect

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

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Problems solved by technology

The oil displacement agents in the production fluid, such as polymers and surfactants, are adsorbed on the oil-water interface in various forms, which increases the mechanical strength and negative charge of the oil-water interface film, making it difficult to separate oil from water in the chemical flooding production fluid

Method used

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  • Reverse demulsifier and preparation method thereof
  • Reverse demulsifier and preparation method thereof
  • Reverse demulsifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, the synthesis of inverse demulsifier A

[0023] (1) Synthesis of cationic polyamide-amine

[0024] At room temperature, slowly drop epichlorohydrin into the 3.0-generation polyamide-amine aqueous solution represented by formula (I), raise the temperature to 45°C, react for 24 hours, and use N,N-dimethylformamide as a solvent to precipitate the product cation The mass of polyamidoamine CPA01; 3.0 generation polyamidoamine and epichlorohydrin is 12 grams and 10 grams respectively.

[0025] (2) Synthesis of polyepichlorohydrin quaternary ammonium salt

[0026] At 0°C, slowly drop epichlorohydrin into a three-necked flask filled with ethylene glycol, tin tetrachloride and trifluoroacetic acid, control the reaction temperature at 0°C, after 5 hours of reaction, raise the temperature to 45°C, and add to the reaction Trimethylamine aqueous solution was added dropwise to the system, and after 24 hours of reaction, the solvent was distilled off under reduced pres...

Embodiment 2

[0031] Embodiment 2, the synthesis of inverse demulsifier B

[0032] (1) Synthesis of cationic polyamide-amine

[0033] At room temperature, slowly drop epichlorohydrin into the 3.0-generation polyamide-amine aqueous solution represented by formula (I), raise the temperature to 50°C, react for 24 hours, and use N,N-dimethylformamide as a solvent to precipitate the product cation The mass of polyamidoamine CPA02; 3.0 generation polyamidoamine and epichlorohydrin is 50 grams and 3 grams respectively.

[0034] (2) Synthesis of polyepichlorohydrin quaternary ammonium salt

[0035] At 0°C, slowly drop epichlorohydrin into a three-necked flask filled with ethylene glycol, tin tetrachloride and trifluoroacetic acid, control the reaction temperature at 10°C, after 5 hours of reaction, raise the temperature to 50°C, and add to the reaction Trimethylamine aqueous solution was added dropwise to the system, and after reacting for 24 hours, the solvent was distilled off under reduced pre...

Embodiment 3

[0040] Embodiment 3, the synthesis of inverse demulsifier C

[0041] (1) Synthesis of cationic polyamide-amine

[0042] At room temperature, slowly drop epichlorohydrin into the 3.0-generation polyamide-amine aqueous solution represented by formula (I), raise the temperature to 45°C, react for 12 hours, and use N,N-dimethylformamide as a solvent to precipitate the product cation The mass of polyamidoamine CPA03; 3.0 generation polyamidoamine and epichlorohydrin is 100 grams and 1 gram respectively.

[0043] (2) Synthesis of polyepichlorohydrin quaternary ammonium salt

[0044]At 0°C, slowly drop epichlorohydrin into a three-necked flask filled with 1,4-butanediol and tin tetrachloride, control the reaction temperature at 5°C, after 1 hour of reaction, raise the temperature to 45°C, and add to the reaction system Triethylamine aqueous solution was added dropwise, and after reacting for 12 hours, the solvent was distilled off under reduced pressure at 50°C to obtain polyepichl...

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Abstract

The invention also discloses a reverse demulsifier and a preparation method thereof. The method comprises the following steps of: (1) reacting dendritic third-generation polyamide-amine shown as a formula (I) and epichlorohydrin to obtain cationic polyamide-amine; (2) performing polymerization reaction on dibasic alcohol and epichlorohydrin in the presence of a catalyst to obtain polyepichlorohydrin, and reacting the polyepichlorohydrin and tertiary amine to obtain polyepichlorohydrin quaternary ammonium salt; (3) performing free radical polymerization reaction on acryloxyethyl trimethylammonium chloride in water in the presence of an initiator and a terminator to obtain poly(acryloxyethyl trimethylammonium chloride); and (4) mixing the cationic polyamide-amine, the polyepichlorohydrin quaternary ammonium salt, the poly(acryloxyethyl trimethylammonium chloride) and the water to obtain the reverse demulsifier. The reverse demulsifier has a good effect of demulsifying oil-in-water emulsions produced by oil fields, and is suitable for chemical flooding produced fluids; and the invention is characterized in that: the preparation method is easy to operate, and the requirements on equipment are low.

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] In recent years, the development of most domestic oilfields has entered a period of high water cut. Chemical flooding technologies, such as polymer flooding, polymer / surface binary compound flooding and poly / surface / alkali ASP flooding, have been widely used in major domestic oilfields . Since 2003, field tests of polymer flooding and polymer / surface binary compound flooding have been carried out successively in Bohai Oilfield. The application of various extraction technologies makes crude oil mostly produced in the form of oil-in-water emulsion. The oil displacement agents in the produced fluid, such as polymers and surfactants, are adsorbed on the oil-water interface in various forms, which increases the mechanical strength and negative charge of the oil-water interface film, making ...

Claims

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Application Information

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IPC IPC(8): C10G33/04C08G69/48C08G59/14C08F120/34
Inventor 檀国荣张健
Owner CHINA NAT OFFSHORE OIL CORP
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