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Acrylamide copolymer as well as preparation method and application thereof

A technology of acrylamide copolymer and acrylamide copolymerization, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unfavorable polymer migration, viscosity increase, increase of copolymer water solubility, etc., and achieve the improvement of petroleum Effects of recovery factor, high viscosity, and reduced flow rate ratio

Active Publication Date: 2019-01-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN101302267A (200810095791.5) discloses a non-ionic thermal thickening water-soluble polymer, which is a polymer formed by copolymerization of monomer (A) and monomer (B), characterized in that monomer (A) It is a kind of non-ionic monomer, and monomer (B) is a non-ionic macromonomer without surface activity; a molecular design method of a heat-increasing water-soluble polymer is adopted, and a non-ionic water-soluble macromonomer and a non-ionic macromonomer are used. The copolymerization of ionic monomer acrylamide can not only increase the water solubility of the copolymer, but also make the viscosity of the copolymer significantly increase with the increase of temperature; however, it can be seen from Fig. 1 and Fig. 2 of this patent that the Obvious thickening, which is not conducive to the migration of polymers in the formation

Method used

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  • Acrylamide copolymer as well as preparation method and application thereof
  • Acrylamide copolymer as well as preparation method and application thereof
  • Acrylamide copolymer as well as preparation method and application thereof

Examples

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preparation example Construction

[0046] According to the preparation method of the present invention, as long as the monomer D, the monomer E and the monomer F are copolymerized according to the above-mentioned ratio relationship, the prepared acrylamide copolymer can achieve the purpose of the present invention to a certain extent. . Preferably, the weight ratio of the monomer D, the monomer E and the monomer F is 1: (0.16-0.32): (0.002-0.027).

[0047] According to the preparation method of the present invention, preferably the polymerization reaction is a random copolymerization reaction.

[0048] According to the preparation method of the present invention, the monomer D having the structure represented by formula (IV) may be an acrylamide-based monomer, and examples that can be used include but are not limited to acrylamide, methacrylamide, N,N-di One or more of methacrylamide, N,N-diethylacrylamide, N-isopropylacrylamide, N-methylolacrylamide and N-hydroxyethylacrylamide; preferably, The monomer D is acryl...

preparation example 1

[0077] According to the preparation method of the document "Acs Macro Letters", 2012, 1(5):529-532), the structural monomer F represented by formula (VI) is prepared, and its structure is as follows:

[0078]

[0079] That is, in the monomer F of the structure represented by formula (VI), R 2 ′ Is H, R 3 ′ Is ethylene, R 4 ′, R 5 ′, R 6 ′ And R 7 'Each independently is a methyl group.

Embodiment 1

[0081] This example is used to illustrate the preparation method of the acrylamide copolymer provided by the present invention.

[0082] (1) Random copolymerization: Add 190g of acrylamide (AM, monomer D) and 50g of sodium 2-acrylamido-2-methylpropanesulfonate (monomer D) into a beaker at room temperature and stirring conditions. E) and 2g of the boron-containing monomer (monomer F) prepared in the above preparation example 1 and 1000g of deionized water; after the raw materials are dissolved, sodium hydroxide is added to the aqueous solution to adjust the pH of the aqueous solution to 7.5; then the aqueous solution is passed through After deoxidizing with nitrogen for 30 minutes, the beaker was sealed to form an inert atmosphere; then 0.01g of ammonium persulfate and 0.01g of sodium bisulfite were added to the aqueous solution as a redox initiation system, and then kept at a constant pressure at 15°C (controlled with chilled salt water) Warm) react for 7 hours to obtain a colloi...

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Abstract

The invention relates to the field of oil field chemicals and discloses an acrylamide copolymer as well as a preparation method and an application thereof. The acrylamide copolymer contains a constitutional unit A shown as formula (I) in the description, a constitutional unit B shown as formula (II) in the description and a constitutional unit C shown as formula (III) in the description; by takingthe total weight of the acrylamide copolymer as the baseline, the constitutional unit A accounts for 70wt%-90wt%, the constitutional unit B accounts for 8wt%-28wt% and the constitutional unit C accounts for 0.1wt%-5wt%. The acrylamide copolymer can be used as a hot thickener for tertiary oil recovery of high-temperature and high-salinity reservoirs.

Description

Technical field [0001] The invention relates to the field of oilfield chemicals, in particular to an acrylamide copolymer and a preparation method and application thereof. Background technique [0002] Polymer flooding technology is an important technology to improve oil recovery. Its basic principle is to add water-soluble polymer to water injection to increase the viscosity of the aqueous solution, reduce the water / oil mobility ratio, expand the swept volume, and increase Sweep efficiency, reduce the oil saturation of the affected zone, thereby improving oil recovery. Practice has proved that the use of polymer flooding can greatly increase the oil recovery rate and produce huge economic and social benefits. For many years, the polymer used in polymer flooding is mainly synthetic partially hydrolyzed polyacrylamide. The limitation of ordinary partially hydrolyzed polyacrylamide is low temperature and salt resistance, and the viscosity of the aqueous solution drops significant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F230/06C08F2/10C09K8/588
CPCC08F2/10C08F220/56C09K8/588C08F220/585C08F230/06
Inventor 张文龙祝纶宇刘希方昭
Owner CHINA PETROLEUM & CHEM CORP
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