Acrylamide copolymer, and preparation method and application thereof

A technology of acrylamide series and copolymers, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature resistance and salt resistance, low surface activity, etc., achieve high temperature resistance and salt resistance, and reduce oil and water Effects of interfacial tension and excellent surface activity

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems of low surface activity and poor temperature and salt resistance of the acrylamide polymer used as an oil displacement agent in the prior art, thereby providing an acrylamide copolymer and its preparation method and application

Method used

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  • Acrylamide copolymer, and preparation method and application thereof
  • Acrylamide copolymer, and preparation method and application thereof
  • Acrylamide copolymer, and preparation method and application thereof

Examples

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preparation example Construction

[0025] According to the second aspect of the present invention, the present invention provides a method for preparing an acrylamide copolymer, the preparation method comprising the following steps: under solution polymerization conditions, in the presence of an initiator, making the monomer mixture in water Carry out polymerization reaction, described monomer mixture contains monomer D, monomer E and monomer F, described monomer D is the monomer with the structure shown in formula (4), and described monomer E is the monomer with formula (5 ), the monomer F is a monomer having a structure shown in formula (6), and based on the total weight of the monomer mixture, the amount of the monomer D is 85-98.9 % by weight, the amount of the monomer E is 1-10% by weight, and the amount of the monomer F is 0.1-5% by weight; the solution polymerization conditions make the viscosity-average molecular weight of the polymer obtained after the polymerization reaction be 2300 10,000-30 million,...

Embodiment approach

[0044] According to a preferred embodiment of the present invention, the steps of the preparation method of the acrylamide copolymer include:

[0045] 1) mixing acrylamide monomer D, surface-active monomer E and fluorine-containing monomer F with water to form an aqueous monomer mixture solution, and adjusting the pH of the aqueous solution to 6-10 with alkali;

[0046] 2) Add complexing agent aqueous solution and other auxiliary agent aqueous solutions to the aqueous solution of step 1), and stir evenly;

[0047] 3) Introduce nitrogen into the reaction system of step 2) to drive oxygen for 20-40 minutes, and add a redox initiator at a temperature of 0-10°C until the solution becomes thick, that is, the polymerization reaction begins, and continue to pass nitrogen for 3-10 minutes Stop after 10 minutes, under nitrogen protection, make this reaction maintain 6-8 hour;

[0048] 4) The temperature of the reaction is raised to 50-70° C., and the reaction is continued for 4-6 hour...

Embodiment 1

[0065] This example is used to illustrate the acrylamide copolymer of the present invention and its preparation method.

[0066] Add 17.98 grams of acrylamide, 2.0 grams of 2-acrylamidotetradecyl sulfonic acid and 0.02 g of perfluorohexyl ethyl acrylate (structure shown in formula (7), purchased from Bailingwei Reagent Co., Ltd.) in the polymerization bottle , adding 60 grams of deionized water to form an aqueous solution of the monomer mixture, and then adjusting the pH to 6.0 with sodium hydroxide. Add 1.0 g of EDTA-2Na aqueous solution and 0.5 g of urea aqueous solution to the polymerization bottle in sequence, and stir evenly. Put the polymerization bottle in a constant temperature water bath, pass high-purity nitrogen gas to remove oxygen for 30 minutes, add potassium persulfate aqueous solution (concentration is 0.1% by weight) 3g and sodium bisulfite aqueous solution (concentration is 0.1% by weight) 1.5g, at 0 ℃ Initiator reaction, continue to pass nitrogen for 5 minu...

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Abstract

The invention discloses an acrylamide copolymer, and a preparation method and an application thereof. The acrylamide monomer contains 85-98.9 wt% of a structure unit A with the structure represented by formula (1), 1-10 wt% of a structure unit B with the structure represented by formula (2) and 0.1-5 wt% of a structure unit C with the structure represented by formula (3); the viscosity average molecular weight of the acrylamide copolymer is 23-30 millions; and in the formula (1), the formula (2) and the formula (3), R1 to R3 can be same or different and are hydrogen or C1-C4 alkyl groups respectively independently, M is hydrogen, sodium or potassium, p is an integer in a range of 8-16, m is an integer in a range of 2-4, and n is an integer in a range of 3-9. The acrylamide copolymer has the advantages of high molecular weight, good temperature and salt resistance, and excellent surface activity.

Description

technical field [0001] The present invention relates to a kind of acrylamide series copolymer, the preparation method of this acrylamide series copolymer, and the acrylamide series copolymer prepared by this method, the present invention also relates to the application of described acrylamide series copolymer as oil displacement agent . Background technique [0002] At present, the oil displacement polymer used in oil field enhanced oil recovery is mainly partially hydrolyzed polyacrylamide (HPAM), which has the characteristics of high molecular weight and good water solubility, and is widely used to increase the viscosity of the water phase and reduce the oil-water mobility ratio. To achieve the purpose of improving displacement efficiency. However, HPAM is not suitable for high-temperature and high-salt reservoirs at all: when the reservoir temperature is higher than 75°C, HPAM will be severely degraded, resulting in a decrease in viscosity, and the viscosity of HPAM solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/22C09K8/588
Inventor 赵方园王晓春于芳杨捷
Owner CHINA PETROLEUM & CHEM CORP
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