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Hydrophobic polymer graft modified acrylamide polymer and preparation method thereof

An acrylamide-based, hydrophobic polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of temperature resistance, salt resistance, aging resistance and poor displacement effect, etc., to achieve enhanced oil recovery , improve the effect of heat resistance and salt resistance, not easy to curl

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is that when the general-purpose acrylamide polymers in the prior art are used in the field of three mines, there are problems of poor temperature resistance, salt resistance, aging resistance and poor displacement effect. Hydrophobic polymer graft modified acrylamide polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Inject 0.10mol 1-hydroxyl-2,2,5-trimethyl-3-(1-phenylethoxy)-4-phenyl-3-azahexane, 0.12mol peroxide into the dry reaction flask Dicumylbenzene and 0.8mol N,N-dimethylacrylamide were reacted at 87°C for 6 hours, and isopropanol was added to terminate the reaction. After precipitation with ether, the hydrophobic association poly-N with a molecular weight of 770 was obtained. , N-dimethylacrylamide homopolymer. 0.08g of the obtained polymer and 2.2g of polyacrylamide with a viscosity-average molecular weight of 28.5 million were dispersed in 97g of potassium carbonate aqueous solution (pH=8.0) under strong stirring, and graft copolymerization occurred under the action of reflux , to obtain the graft modified polymer polyacrylamide- g - poly-N,N-dimethylacrylamide.

[0021] Use the following methods or standards to test the structure and performance of the grafted modified polyacrylamide obtained by the hydrophobic polymer: measure the intrinsic viscosity of the polymer a...

Embodiment 2

[0025] Inject 0.13mol 1-chloro-2,5-dimethyl-3-(1-phenylethoxy)-4-phenyl-3-azahexane, 0.15mol benzyl peroxide into the dry reaction flask Acyl and 0.25mol N-n-dodecyl acrylamide, after reacting at 75°C for 7 hours, adding isopropanol to terminate the reaction, and after precipitation with ether, a hydrophobic association type poly-N-n-dodecyl with a molecular weight of 500 was obtained. Alkylacrylamide homopolymer. The poly(acrylamide- r -2-acrylamido-2-methyl propane sulfonate) (degree of hydrolysis 18.2%), under strong stirring, dispersed in 98g potassium bicarbonate aqueous solution (pH=10.0), under reflux, contact occurred branch copolymerization reaction to obtain graft modified polymer poly(acrylamide- r -2-acrylamido-2-methylpropanesulfonate sodium)- g - Poly(N-n-dodecylacrylamide).

[0026] The structure and properties of the hydrophobic polymer graft-modified acrylamide polymer obtained were tested by the method or standard described in Example 1, and the analysis ...

Embodiment 3

[0029] Inject 0.11mol 1-amino-2,5,5-trimethyl-3-(1-phenylethoxy)-4-phenyl-3-azahexane, 0.125mol iso Propylbenzene hydroperoxide, 0.2mol N-tert-butylacrylamide and 0.1mol N-phenylacrylamide react at 92°C for 7 hours, then add isopropanol to terminate the reaction, and precipitate with ether to obtain a molecular weight of 350 Hydrophobic associative poly(N-tert-butylacrylamide- r -N-phenylacrylamide) random copolymer. 0.05 g of the obtained copolymer and 1.7 g of ultra-high molecular weight polyacrylamide with a viscosity-average molecular weight of 17.2 million were dispersed in 99 g of potassium hydroxide aqueous solution (pH=9.8) under the action of strong stirring, and contact occurred under the action of reflux. branch copolymerization reaction to obtain graft modified polymer polyacrylamide- g -Poly(N-tert-butylacrylamide- r -N-phenylacrylamide).

[0030] The structure and properties of the hydrophobic polymer graft-modified polyacrylamide obtained were tested by the ...

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Abstract

The invention provides a hydrophobic polymer graft modified acrylamide polymer and a preparation method thereof, mainly for solving the problem in the prior art that general acrylamide polymers have poor temperature resistance, poor resistance to salinity, poor ageing-resistance performance and poor displacement effect. The chemical general formula of the hydrophobic polymer graft modified acrylamide polymer is P-g-X, wherein P is polyacrylamide or acrylamide polymer, X is hydrophobic polymer the molecular chain structure of which is in a form of homopolymerisation, random copolymerization or block copolymerization, and the viscosity average molecular weight of the graft compound is more than or equal to seventeen million. The adoption of the hydrophobic polymer graft modified acrylamide polymer and the preparation method thereof well solves the problem in the prior, and the technical scheme can be used in industrial production and displacement of reservoir oil.

Description

technical field [0001] The invention relates to the field of tertiary oil recovery, in particular to a hydrophobic polymer graft-modified acrylamide polymer and a preparation method thereof. Background technique [0002] The general performance requirements of water-soluble polymers in oil and gas field production mainly include: water solubility, viscosity increasing, suspension, shear thinning and thixotropy, stability and seepage characteristics to meet the requirements of oil and gas production engineering, etc. Although ultra-high molecular weight polyacrylamide can still enhance oil recovery at higher temperatures (such as 120°C) in an oxygen-free and divalent ion-free environment, water-soluble polymers commonly used in tertiary oil recovery still exist when they are used for oil displacement. many questions. For example, when the temperature is high, the hydrolysis of polyacrylamide is serious; when the formation temperature exceeds 75°C, as the formation temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F120/54C08F220/54C08F293/00C08F2/38C09K8/588
Inventor 于志省夏燕敏
Owner CHINA PETROLEUM & CHEM CORP
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