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Functional polymeric surfactant-reinforced betaine composite flooding system and use thereof

A technology of surfactants and functional monomers, applied in the field of betaine composite flooding systems enhanced by functional polymer surfactants, can solve problems such as difficult industrial application, high cost, and difficult control of foam formation and stability

Inactive Publication Date: 2015-01-28
大连东方创新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Micellar flooding can theoretically recover "almost" all the crude oil in the formation, but due to the use of high concentrations of surfactants and a large amount of alcohol, the cost is too high and it is difficult to realize industrial application
[0006] Foam composite flooding can also greatly increase oil recovery, but the formation and stabilization of foam is difficult to control in the formation, and the on-site implementation is risky

Method used

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  • Functional polymeric surfactant-reinforced betaine composite flooding system and use thereof
  • Functional polymeric surfactant-reinforced betaine composite flooding system and use thereof
  • Functional polymeric surfactant-reinforced betaine composite flooding system and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Polymer: The water-soluble polymer is partially hydrolyzed polyacrylamide HPAM, produced by Daqing Refining and Chemical Company, with a molecular weight of 9 million.

[0060] (2) Betaine surfactant: a mixture of octadecyl hydroxypropyl sultaine: m-xylyl octadecamidopropyl hydroxypropyl sultaine = 30:70 (w / w).

[0061] Octadecyl hydroxypropyl sulfobetaine: the ratio of octadecyl tertiary amine to sodium 3-chloro-2-hydroxypropanesulfonate is 1:1.1 (molar ratio), methanol is used as solvent at 125°C for quaternization After 8 hours of reaction, the product was obtained by demethanolization.

[0062] m-xylyl octadecanoyl propyl hydroxypropyl sultaine: Friedel-Crafts alkylation reaction of m-xylene and oleic acid under the action of an acidic catalyst to obtain m-xylyl octadecanecarboxylic acid, and then react with N , N-dimethylpropylamine carries out amidation reaction, obtains m-xylyl octadecamidopropyl tertiary amine, and then with 3-chloro-2-hydroxypropanesulfona...

Embodiment 2

[0084] (1) Polymer: The water-soluble polymer is partially hydrolyzed polyacrylamide HPAM, produced by Daqing Refining and Chemical Company, with a molecular weight of 25 million.

[0085] (2) Betaine surfactant: octadecyl hydroxypropyl sulfobetaine: m-xylyl octadecyl hydroxypropyl sulfobetaine = 50:50 (w / w) mixture

[0086] Octadecyl hydroxypropyl sultaine: with embodiment 1.

[0087] m-Xylyl octadecyl hydroxypropyl sulfobetaine: provided by the State Key Laboratory of Enhanced Oil Recovery.

[0088] (3) functional polymer surfactant: with embodiment 1.

[0089] (4) Nonionic surfactant: stearyl alcohol polyoxypropylene (5) polyoxyethylene (20) ether, provided by Tianjin University of Technology.

[0090] The composition of strong alkali combined flooding system of the present invention:

[0091]

Embodiment 3

[0110] (1) polymer: with embodiment 2.

[0111] (2) Betaine Surfactant: Erucamide Propyl Hydroxypropyl Sultaine

[0112] Erucic acid amidopropyl hydroxypropyl sulfobetaine: erucic acid amidopropyl tertiary amine and 3-chloro-2-hydroxypropanesulfonate sodium ratio is 1:1.1 (molar ratio), 125 ℃ methanol as solvent, for quartering The amination reaction was carried out for 8 hours, and the product was obtained by demethanolization.

[0113] (3) functional polymer surfactant: with embodiment 1.

[0114] (4) Nonionic surfactant: stearyl alcohol polyoxypropylene (5) polyoxyethylene (20) ether, provided by Tianjin University of Technology.

[0115] The composition of weak alkali composite flooding system of the present invention:

[0116]

[0117]

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Abstract

The invention discloses a functional polymeric surfactant-reinforced betaine composite flooding system and a use thereof. The functional polymeric surfactant-reinforced betaine composite flooding system comprises, by weight, 0.05-0.5% of a polymer, 0.03-0.5% of a betaine surfactant, 0.01-0.3% of a functional polymeric surfactant, 0.01-0.3% of a nonionic surfactant, 0.0-1.5% of an alkali and the balance water. The functional polymeric surfactant-reinforced betaine composite flooding system utilizes combination of a plurality of oil flooding mechanisms, can greatly improve crude oil extraction ratio, can realize further oil extraction of oil reservoir subjected to polymer flooding, can greatly improve final oil extraction ratio of the oil reservoir and has effects better than those of the existing oil flooding system.

Description

technical field [0001] The invention relates to a functional polymer surfactant-enhanced betaine composite flooding system, which belongs to the technical field of petroleum exploitation. Background technique [0002] Polymer flooding can increase oil recovery by more than 10%. Polymer flooding technology has been applied industrially in major oil fields in China. [0003] Polymer-surfactant-alkali ASP flooding technology, laboratory research and field tests have proved that it can increase oil recovery by more than 20%, and it has been industrialized in China's Daqing, Shengli and other oil fields. [0004] Betaine composite flooding system, indoor research results have confirmed that the recovery rate can be increased by more than 20-25%, and it is one of the best composite flooding systems at present. [0005] In theory, micellar flooding can recover "almost" all the crude oil in the formation, but due to the use of high concentrations of surfactants and a large amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/20
Inventor 刘春德
Owner 大连东方创新科技有限公司
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