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Acrylamide copolymer and its preparation method and application

An acrylamide copolymer and acrylamide copolymerization technology are applied in chemical instruments and methods, drilling compositions and other directions, which can solve the problems of increasing the water solubility of the copolymer, increasing the viscosity, unfavorable polymer migration, etc. Recovery factor, reduced water/oil flow rate ratio, effect of structural stabilization

Active Publication Date: 2020-12-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101302267A (200810095791.5) discloses a nonionic thermally 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 thermal viscosity-increasing water-soluble polymer is adopted, and the non-ionic water-soluble macromonomer and non-ionic 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 Figure 1 and Figure 2 of this patent that at lower temperatures Obvious thickening, which is not conducive to the migration of polymers in the formation

Method used

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  • Acrylamide copolymer and its preparation method and application
  • Acrylamide copolymer and its preparation method and application
  • Acrylamide copolymer and its preparation method and application

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preparation example Construction

[0049] 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 ratio, 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).

[0050] According to the preparation method of the present invention, preferably, the polymerization reaction is a random copolymerization reaction.

[0051] According to the preparation method of the present invention, wherein the monomer D having the structure shown in formula (IV) can be an acrylamide-based monomer, 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 acrylamide or methacrylamid...

preparation example 1

[0080] According to the preparation method of the document "Acs Macro Letters", 2012, 1(5):529-532), the structural monomer F shown in formula (VI) is prepared, and its structure is as follows:

[0081]

[0082] That is, in the monomer F of the structure shown in formula (VI), R 2 ' for H, R 3 ' is ethylene, R 4 ', R 5 ', R 6 ' and R 7 ' are each independently a methyl group.

Embodiment 1

[0084] This example is used to illustrate the preparation method of the acrylamide copolymer provided by the present invention.

[0085] (1) random copolymerization reaction: at room temperature, under agitation, add 190g of acrylamide (AM, monomer D), 50g of acryloyloxyethyl trimethyl ammonium chloride (monomer E) and 2g of the boron-containing monomer (monomer F) prepared by the above Preparation Example 1 and 1000g of deionized water; after the raw materials are dissolved, add sodium hydroxide to the aqueous solution to adjust the pH of the aqueous solution to 7.5; then feed nitrogen into the aqueous solution to remove After oxygenation for 30 minutes, seal the beaker to form an inert atmosphere; then add 0.01 g of ammonium persulfate and 0.01 g of sodium bisulfite to the aqueous solution as a redox initiation system, and then react at normal pressure and constant temperature at 15°C (temperature control with frozen brine) 7 hours, obtain colloidal polymer solution product;...

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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 its preparation method and application. Background technique [0002] Polymer flooding technology is an important enhanced oil recovery technology. Its basic principle is to add water-soluble polymers to the injection water to increase the viscosity of the aqueous solution, reduce the water / oil mobility ratio, expand the swept volume, and increase the Sweep efficiency, reducing oil saturation in the swept zone, thereby enhancing oil recovery. Practice has proved that the use of polymer flooding can greatly improve oil recovery, resulting in huge economic and social benefits. For many years, the polymer used in polymer flooding is mainly artificially synthesized partially hydrolyzed polyacrylamide. The limitation of ordinary partially hydrolyzed polyacrylamide is its low temperature and salt resistance, and the viscosity of the aqueous solution drops...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F230/06C09K8/588
CPCC08F220/56C09K8/588C08F220/34C08F230/06
Inventor 张文龙刘希伊卓祝纶宇
Owner CHINA PETROLEUM & CHEM CORP
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