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Acrylamide copolymer as well as preparation method and application thereof

An acrylamide copolymer and acrylamide copolymerization technology are applied in the directions of chemical instruments and methods, drilling compositions, etc., and can solve the problems of difficult synthesis of macromonomers, complicated synthesis steps, unfavorable polymer migration and movement, and the like. Good water solubility and low temperature stability, increasing hydration radius and increasing viscosity

Active Publication Date: 2018-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, macromonomers are prepared by copolymerization with acrylamide and 2-acrylamide-2-methyl-1-propanesulfonic acid, which has good thickening performance in tertiary oil recovery of high-temperature and high-salt reservoirs, but The synthesis of macromonomers is difficult, the synthesis steps are complicated, and the thickening is obvious at lower temperatures, 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

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preparation example Construction

[0028] At the same time, the present invention also provides a method for preparing an acrylamide copolymer, the preparation method comprising the following steps: under the solution polymerization reaction conditions of olefins, in the presence of an initiator, the monomer mixture is polymerized in water , the monomer mixture contains monomer D having the structure shown in formula IV, monomer E having the structure shown in formula V and monomer F having the structure shown in formula VI, and the monomer D, the monomer The weight ratio of body E and said monomer F is 1:(0.01~0.65):(0.01~0.65),

[0029]

[0030] In Formula IV, R 1 ' is any one of H and C1-C4 alkyl; in formula VI, R 2 ', R 3 'are independently selected from any one of H and C1~C12 alkyl groups; R 4 ' is any one selected from H, C1-C12 alkyl groups, and C6-C12 alkyl groups. The C1-C4 alkyl group, the C1-C12 alkyl group, and the C6-C12 aryl group are the same as those described above, and will not be repe...

Embodiment 1

[0061] It is used to illustrate the acrylamide copolymer of the present invention and its preparation method.

[0062] The structure of the adopted α-methylene-γ-lactonate (commercially purchased from Aladdin Reagent Company, the same below) is as follows:

[0063]

[0064] The preparation method of acrylamide copolymer comprises:

[0065] Add 200g of acrylamide (AM), 25g of 2-hydroxyethyl methacrylate phosphate and 25g of the above-mentioned α-methylene-γ-lactonate and 1000g of de Ionized 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 pass nitrogen gas into the aqueous solution to remove oxygen for 30 minutes and then seal the beaker to form an inert atmosphere; then add 0.01 g of ammonium persulfate and 0.01 g of sodium bisulfite was used as a redox initiator system, and then reacted at normal pressure and constant temperature (controlled with frozen brine) for 7 hours to ob...

Embodiment 2

[0068] It is used to illustrate the acrylamide copolymer of the present invention and its preparation method.

[0069]The α-methylene-γ-lactonate used: the same as in Example 1.

[0070] The preparation method of acrylamide copolymer comprises:

[0071] At room temperature, under stirring conditions, add 225g of acrylamide (AM), 50g of 2-hydroxyethyl methacrylate phosphate and 12.5g of the above-mentioned α-methylene-γ-lactonate 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 6.5; then pass nitrogen gas into the aqueous solution to remove oxygen for 30 minutes and then seal the beaker to form an inert atmosphere; then add 0.02 g of initiator 2 to the aqueous solution , 2'-Azobis(2-methylpropionamidine) hydrochloride (AIBA), and then react at normal pressure and 50°C constant temperature (water bath temperature control) for 4 hours to obtain a colloidal polymer solutio...

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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 structure unit A shown in the formula I, a structure unit B shown in the formula II and a structure unit C shown in the formula III; on the basis of the total weight of the acrylamide copolymer, the content of the structure unit A is 43.5wt%-98wt%, the content of the structure unit B is 0.6wt%-39wt%, and the content of the structure unit C is 0.6wt%-39wt%. The acrylamide copolymer has good water solubility and a thermothickening function and is applicable to three-time oil recovery of a high-temperature and high-salinity reservoir as a thermothickening agent.

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 limitations of ordinary partially hydrolyzed polyacrylamide are low temperature and salt resistance, high hydrolysis speed under high temperature and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/28C08F220/18C08F220/16C09K8/035C09K8/588
CPCC08F220/56C09K8/035C09K8/588C08F220/282C08F220/18C08F220/16
Inventor 张文龙伊卓祝纶宇刘希杜超方昭胡晓娜
Owner CHINA PETROLEUM & CHEM CORP
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