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Betaine surfactant combination flooding system and application thereof

A technology of surfactant and composite flooding, which is applied in the direction of drilling composition, chemical instruments and methods, etc., and can solve the problems of small charge repulsion and poor emulsification stability

Inactive Publication Date: 2015-01-07
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

The charge repulsion of the hydrophilic group head of the betaine active agent is very small, and the emulsification stability is also poor

Method used

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  • Betaine surfactant combination flooding system and application thereof
  • Betaine surfactant combination flooding system and application thereof
  • Betaine surfactant combination flooding system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Application of Betaine Surfactant Compound Flooding System in Enhanced Oil Recovery of Low Permeability Reservoir:

[0066] (1) Betaine surfactant: a mixture of octadecyl hydroxypropyl sultaine: didodecyl hydroxypropyl sultaine = 70:30 (w / w).

[0067] Octadecyl hydroxypropyl sultaine and didodecyl hydroxypropyl sultaine: Octadecyl tertiary amine or didodecyl tertiary amine in combination with sodium 3-chloro-2-hydroxypropane sulfonate The ratio is 1:1.1 (molar ratio), methanol is used as solvent at 125°C, the quaternization reaction is carried out for 8 hours, and the product is obtained by demethanolization.

[0068] (2) Nonionic surfactant: m-xylyl octadecyl alcohol polyoxypropylene (5) polyoxyethylene (20) ether: Friedel-Crafts alkylation of m-xylene and methyl oleate under the action of an acidic catalyst Reaction to obtain m-xylyl octadecane carboxylate methyl ester, further hydrogen reduction to obtain m-xylyl octadecyl alcohol, and then carry out addition reacti...

Embodiment 2

[0082] Application of Betaine Surfactant Compound Flooding System in Enhanced Oil Recovery of Medium and Low Permeability Reservoirs:

[0083] (1) Betaine surfactant: a mixture of octadecyl hydroxypropyl sultaine: didodecyl hydroxypropyl sultaine = 70:30 (w / w).

[0084] Octadecyl hydroxypropyl sultaine and didodecyl hydroxypropyl sultaine are the same as in Example 1.

[0085] (2) Nonionic surfactant: m-xylyl octadecyl alcohol polyoxypropylene (5) polyoxyethylene (20) ether, with embodiment 1.

[0086] (3) Polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer: with embodiment 1.

[0087] (4) Polymer: The water-soluble polymer is partially hydrolyzed polyacrylamide HPAM, with a molecular weight of 17-19 million, produced by Daqing Refining and Chemical Company.

[0088] The composition of composite flooding system of the present invention:

[0089]

[0090]

Embodiment 3

[0100] Application of Betaine Surfactant Compound Flooding System in Enhanced Oil Recovery of Medium and Low Permeability Reservoirs:

[0101] (1) Betaine surfactant: a mixture of octadecyl hydroxypropyl sultaine: didodecyl hydroxypropyl sultaine = 80:20 (w / w).

[0102] Octadecyl hydroxypropyl sultaine and didodecyl hydroxypropyl sultaine are the same as in Example 1.

[0103] (2) Nonionic surfactant: stearyl alcohol polyoxypropylene (5) polyoxyethylene (20) ether, provided by Tianjin University of Technology.

[0104] (3) Polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer: with embodiment 1.

[0105] (4) Polymer: The water-soluble polymer is partially hydrolyzed polyacrylamide HPAM, with a molecular weight of 25 million, produced by Daqing Refining and Chemical Company.

[0106] The composition of composite flooding system of the present invention:

[0107]

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Abstract

The invention relates to a betaine surfactant combination flooding system and application thereof. The combination flooding system comprises the following components in percentage by weight: 0.03-0.5% of betaine surfactant, 0.01-0.3% of nonionic surfactant, 0.0-0.3% of polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer, 0.0-0.5% of polymer, 0.0-1.5% of alkali and the balance of water. The polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer, polymer and alkali are not 0 at the same time. By using the cheaper betaine surfactant and integrating multiple mechanisms for enhancing the recovery rate, the surfactant combination flooding system achieves good coordination between recovery rate enhancement effect and cost, can greatly enhance the oil recovery rate, and has economic effect of forced production in low-permeability reservoirs and high-temperature high-salt reservoirs.

Description

technical field [0001] The invention relates to a betaine surfactant composite flooding system and an application thereof, belonging to the technical field of petroleum exploitation. Background technique [0002] U.S. Patent No. 4,008,165 reports the application of sulfobetaine amphoteric surfactants in tertiary oil recovery. The surfactants disclosed in this U.S. patent are very effective in reducing oil-water interfacial tension in high-salt water-based media with a large content of divalent metal cations. Patent 200410070467.X reported a betaine surfactant with an arylalkylhydrophobic structure synthesized from alkylphenols, which has excellent performance in reducing interfacial tension, but the synthesis process is very complicated. Patent 201210056931.4 reports another betaine surfactant with arylalkyl hydrophobic structure synthesized from oleic acid, which also has a good performance of reducing interfacial tension, but the synthesis route is too long. [0003] Pate...

Claims

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Application Information

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