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Amphiphilic polymer oil-displacing agent with biquaternary ammonium salt long chain structure and preparation method of amphiphilic polymer oil-displacing agent

A technology of amphiphilic polymer and biquaternary ammonium salt, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of small branching degree and low charge density of polymer molecules, and achieves large branching degree. , The effect of good hydrophobic site and good apparent viscosity

Active Publication Date: 2019-04-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The hydrophobic branching of the above-mentioned amphiphilic polymer is usually to introduce one or two hydrophobic carbon chains on the tertiary amine or quaternary ammonium, the degree of branching of this synthetic method is small, and the charge density of the polymer molecule is low

Method used

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  • Amphiphilic polymer oil-displacing agent with biquaternary ammonium salt long chain structure and preparation method of amphiphilic polymer oil-displacing agent
  • Amphiphilic polymer oil-displacing agent with biquaternary ammonium salt long chain structure and preparation method of amphiphilic polymer oil-displacing agent
  • Amphiphilic polymer oil-displacing agent with biquaternary ammonium salt long chain structure and preparation method of amphiphilic polymer oil-displacing agent

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Embodiment 1

[0050] The synthesis of embodiment 1 double branched cationic hydrophobic monomer

[0051] Weigh according to n(hexadecyldimethyl tertiary amine):n(cis-1,4-dichloro-2-butene)=2.1:1, dissolve in ethanol, pour into a three-necked flask and stir well, Raise the temperature to 60°C and react for 19h. The light yellow product was distilled under reduced pressure, added acetone and placed at 3°C ​​for 3 hours, cooled to crystallize, filtered, washed and dried to obtain CC 16 - White powder of DMBAC.

Embodiment 2

[0052] The synthetic method of the amphiphilic polymer oil displacement agent of embodiment 2 double quaternary ammonium salt long-chain structure

[0053] The CC synthesized in AM and Example 1 16 -DMBAC was added to a three-necked flask at 39°C at a molar ratio of 98:2, a certain mass of distilled water (monomer mass fraction: 20%) was added and stirred evenly, nitrogen gas was introduced for 15 minutes, the temperature was raised to 41°C, and 0.05% of the total monomer was added Fractions of the initiator AIBA, after the reaction, the product was repeatedly washed and purified in acetone, and dried to obtain the amphiphilic polymer DMAPMA with a double quaternary ammonium salt long-chain structure, with a yield of 86.34%.

[0054] Synthetic route such as figure 1 Shown:

[0055] Characterization and performance of the amphiphilic polymer oil displacement agent with double quaternary ammonium salt long chain structure in embodiment 2

[0056] 1. Infrared characterization...

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Abstract

The invention belongs to the field of tertiary oil recovery, and particularly relates to an amphiphilic polymer oil-displacing agent with a biquaternary ammonium salt long chain structure and a preparation method of the amphiphilic polymer oil-displacing agent. For the technical problem that the salt resistance of an oil-displacing agent adopted in the prior art is frequently poor, the oil-displacing agent with good salt resistance, viscosifying action and shear resistance is provided. Firstly, N,N-dimethylhexadecylamine and cis-1,4-dichloro-2-butene are taken as raw materials to synthesize adouble-branched cationic hydrophobic monomer N,N'-bis(hexadecyl dimethyl)-1,2-chloride-2-butene-ammonium salt (CC16-DMBAC), then the CC16-DMBAC and acrylic amide (AM) perform copolymerization, a cationic group and a hydrophobic long chain are introduced onto an acrylic amide main chain, so that polymer molecules form a three-dimensional network structure with a certain strength by virtue of a hydrophobic interaction function among the molecules, and the oil-displacing agent has viscosifying action and good shear resistance and salt resistance.

Description

technical field [0001] The invention belongs to the field of tertiary oil recovery, in particular to an amphiphilic polymer oil displacement agent with a double quaternary ammonium salt long-chain structure and a preparation method thereof. Background technique [0002] Polymer flooding is a mature and widely used tertiary oil recovery method, mainly through the viscosification of polymers to increase the viscosity of the injected fluid, reduce the water-oil mobility ratio, and increase the sweep coefficient to achieve the purpose of enhancing oil recovery. Oil displacement polymers generally have good solubility, good viscosification and are stable in reservoir conditions. At present, the commonly used polymer in the oil field is partially hydrolyzed polyacrylamide (HPAM), but there are certain limitations in the application process of HPAM, such as the poor salt resistance of HPAM, in high-salt (salinity higher than 10000mg / L) conditions Under these conditions, the salt-s...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F220/56C08F226/02
CPCC08F220/56C09K8/588C08F226/02
Inventor 杨红斌康万利陈超张弘文张向峰周博博王芳赵晗李欣欣
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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