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Thermothickening terpolymer, its preparation method and application

A heat-thickening terpolymer and terpolymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve unstable performance, easy hydrolysis of ester bonds, affecting polymer stability, etc. problems, achieve high apparent viscosity, good hydrolysis resistance, and good application prospects

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1240795A discloses a heat-resistant and salt-resistant copolymer thickener. The copolymer is characterized by the amphiphilic macromonomer chain link in the molecule, which shows better temperature and salt resistance than ordinary partially hydrolyzed polyacrylamide. Salt, but the amphiphilic branch in the copolymer is connected to the main chain through the ester bond, and the ester bond is prone to hydrolysis at high temperature, which affects the stability of the polymer
Chinese patent CN200810095791.5 discloses a non-ionic thermal viscosity-increasing water-soluble polymer and explains that it can be applied to various aspects of oil and gas extraction, but this polymer contains acrylate structural units, and polymers containing acrylate structural units Unstable performance under high temperature, high salt and solution pH value acidic or alkaline

Method used

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  • Thermothickening terpolymer, its preparation method and application
  • Thermothickening terpolymer, its preparation method and application
  • Thermothickening terpolymer, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of macromers:

[0044] Add 56.5g of isopropylacrylamide, 49.5g of N,N'-dimethylacrylamide, 0.9g of mercaptoethylamine hydrochloride and 450g of methanol into the reactor, mix well, and add azo 0.85 g of diisobutyronitrile was reacted at 65°C for 6 hours, and the solvent was distilled off under reduced pressure to obtain a solid, which was repeatedly purified three times with hot water at 65°C. Mix 45g of the purified solid, 2g of N,N'-dicyclohexylcarboimide, 60g of methacrylic acid and 300ml of dichloromethane, add dropwise 10% sodium carbonate solution, and react at 5°C for 2.5 hours. The solid was obtained after freeze-drying, and the solid was purified with a mixture of acetone and ether to obtain a macromonomer, which was designated as macromonomer B.

Embodiment 2

[0046] Add 220 parts by mass of deionized water to a reaction kettle equipped with a stirrer, a temperature controller, an air duct and a reflux condenser, and add 20 parts by mass of 2-acrylamide-2-methyl-1-propanesulfonate under stirring acid, after the solid is completely dissolved, use 30% sodium hydroxide solution to adjust the pH value to 10-12; add 50 parts by mass of acrylamide and 30 parts by mass of the macromer B prepared in Example 1, and stir to make all the solids After dissolving, use deionized water to adjust the monomer concentration to be 30%; adjust the initial temperature to be 10°C, feed nitrogen under stirring, and after 30 minutes, add 2 parts by mass of potassium persulfate solution (containing 2 wt% persulfuric acid potassium), 1.5 parts by mass of urea solution (wherein containing 2wt% urea), 2,2-azobis(2-imidopropyl) dihydrochloride (V50) of 0.03 parts by mass, after reacting for 5 hours Cooling, discharging, cutting, freeze-drying, and pulverization...

Embodiment 3

[0048] Add 220 parts by mass of deionized water to a reactor equipped with a stirrer, a temperature controller, an air duct and a reflux condenser, and add 25 parts by mass of 2-acrylamide-2-methyl-1-propanesulfonate under stirring acid, after the solid is completely dissolved, use 30% sodium hydroxide solution to adjust the pH value to 10-12; add 50 parts by mass of acrylamide and 25 parts by mass of the macromer B prepared in Example 1, and stir to make all the solids After dissolving, use deionized water to adjust the monomer concentration to be 30%; adjust the initial temperature to be 10°C, feed nitrogen under stirring, and after 30 minutes, add 2 parts by mass of potassium persulfate solution (containing 2 wt% persulfuric acid potassium), 1.5 parts by mass of urea solution (wherein containing 2wt% urea), 2,2-azobis(2-imidopropyl) dihydrochloride (V50) of 0.03 parts by mass, after reacting for 5 hours Cooling, discharging, cutting, freeze-drying, and pulverization to obta...

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Abstract

The invention provides a thermothickening terpolymer and its preparation method. The water solution viscosity of the copolymer provided in the invention increases with the rise of temperature within a certain temperature range. The water solution of the copolymer has a thermothickening property, and has high apparent viscosity under high temperature and high salinity conditions. Thus, the terpolymer of the invention boasts good application prospects in tertiary oil recovery of high temperature and high salinity oil reservoirs.

Description

technical field [0001] The invention relates to a water-soluble polymer and a preparation method thereof, in particular to a water-soluble terpolymer with thermal thickening property, which belongs to the field of oilfield chemicals. 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 / mobility ratio, expand the swept volume, and increase the Sweep efficiency, reducing oil saturation in the swept zone, thereby enhancing oil recovery. So far, polymer flooding crude oil production accounted for more than 20% of oil field crude oil production. 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 hydrolyz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/04C08F220/54C08F220/56C09K8/588
Inventor 王建宇吴江勇王晓春高文骥杨捷于芳
Owner CHINA PETROLEUM & CHEM CORP
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