Temperature-resistant and salt-resistant copolymer and preparation method thereof

A temperature-resistant, salt-resistant, copolymer technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that hydrolyzed polyacrylamide is easy to hydrolyze, etc., achieve improved hydrolytic stability, improve hydrolytic stability, and effectively Conducive to the effect of industrial production

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] One of the problems to be solved by the present invention is the problem that the partially hydrolyzed polyacrylamide under high temperature and high salinity is easy to be hydrolyzed in the existing tertiary oil recovery enhanced oil recovery technology. A new temperature-resistant and salt-resistant copolymer KWKY-PAD is provided. The copolymer has the advantage of good hydrolytic stability when used in tertiary oil recovery to enhance oil recovery

Method used

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  • Temperature-resistant and salt-resistant copolymer and preparation method thereof

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Effect test

Embodiment 1

[0030] In parts by weight, 69.3 parts of acrylamide and 5.7 parts of N-vinylpyrrolidone are dissolved in 422 parts of water, so that the molar ratio of the two monomers of acrylamide and N, N-dimethylacrylamide is 95:5 , the total mass fraction is 15%; use 2 parts of sodium hydroxide solution to adjust the pH value to 8~10, pour the monomer solution into the reaction vessel, make the temperature of the water bath 5°C, and deoxygenate with nitrogen for 30 minutes; then add 0.003 % Composite initiation system: 0.23 parts of 0.15% potassium persulfate solution, 0.13 parts of 0.09% sodium bisulfite solution, 0.3 parts of 0.6% N,N-dimethylaminoethyl methacrylate; after 30 minutes of reaction, the temperature was raised to 20 DEG C, after continuing the constant temperature polymerization reaction for 4 hours, stop the reaction, add 157.6 g of 5% sodium hydroxide solution to the obtained colloidal product, and hydrolyze it for 1 hour at 80 DEG C, then vacuum-dry and pulverize, namely...

Embodiment 2

[0033] In parts by weight, 85.2 parts of acrylamide and 89.8 parts of N-vinyl caprolactam are dissolved in 293 parts of water, so that the mol ratio of acrylamide and N-vinyl caprolactam two monomers is 65: 35, total The mass fraction is 35%; use 2 parts of sodium hydroxide solution to adjust the pH value to 8~10, pour the monomer solution into the reaction vessel, keep the temperature of the water bath at 15°C, and deoxygenate with nitrogen for 30 minutes; then add 1.5% compound Initiation system: 12.5 parts of 3.15% potassium persulfate solution, 12.5 parts of 15.75% sodium bisulfite solution, 5 parts of 5.25% N,N-dimethylaminoethyl methacrylate; after 120 minutes of reaction, heat up to 50°C After continuing the constant temperature polymerization reaction for 18 hours, stop the reaction, add 71.3 g of sodium hydroxide solution with a concentration of 15% to the obtained colloidal product, and hydrolyze it for 3 hours at 90 ° C, then vacuum dry and pulverize to obtain resist...

Embodiment 3

[0036] In parts by weight, 123.2 parts of acrylamide and 26.8 parts of N-vinyl caprolactam are dissolved in 340 parts of water, so that the mol ratio of acrylamide and N-vinyl caprolactam two monomers is 90: 10, total The mass fraction is 30%; use 2 parts of sodium hydroxide solution to adjust the pH value to 8~10, pour the monomer solution into the reaction vessel, keep the temperature of the water bath at 10°C, and deoxygenate with nitrogen for 30 minutes; then add 0.03% compound initiator System: 5 parts of 0.76% potassium persulfate solution, 1 part of 0.23% sodium bisulfite solution, 1 part of 0.45% N,N-dimethylaminoethyl methacrylate; after 90 minutes of reaction, heat up to 25°C, After continuing the constant temperature polymerization reaction for 12 hours, stop the reaction, add 157.6 g of 10% sodium hydroxide solution to the obtained colloidal product, and hydrolyze it at 90 ° C for 3 hours, then vacuum dry and pulverize to obtain the temperature resistant Salt-resis...

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Abstract

The invention relates to a temperature-resistant and salt-resistant copolymer and a preparation method thereof, and mainly solves a problem that polyacrylamide has high possibility of hydrolysis under the conditions of high temperature and high mineralization degree in a conventional technology for improving the recovery efficiency by tertiary oil recovery. According to the technical scheme, the temperature-resistant and salt-resistant copolymer NWKY-PAN has a general formula shown in the specification, wherein p is the number of -CH2- , and is 1 to 3; x, y and m are the structural unit mole numbers of acrylamide, hydrolyzed acrylamide and lactam monomers respectively, x is 95 to 15, y is 4 to 40, and m is 1 to 45; the molecular weight of the copolymer NWKY-PAN is 12,000,000 to 18,000,000; the problem in the prior art is better solved; the temperature-resistant and salt-resistant copolymer can be used for the industrial production of an oil displacement agent for oil recovery in an oilfield.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant copolymer for tertiary oil recovery and a preparation method thereof. Background technique [0002] With the development of the world economy, the social demand for oil continues to increase, while oil reserves continue to decrease. Petroleum is becoming more and more valuable as a non-renewable resource. The problems we are facing are: first, the contradiction between supply and demand is prominent, the demand for oil is getting bigger and bigger, and new oil fields are getting fewer and fewer; second, there is still a large amount of crude oil left in the depleted oil reservoirs. Primary oil recovery (POR) can recover 10-25% of underground crude oil, and secondary oil recovery (SOR) can recover 15-25% of underground crude oil, that is, only 25-50% of underground crude oil can be recovered from primary oil recovery and secondary oil recovery. In order to ensure long-term stable oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/06C08F226/10C08F4/40C09K8/588
Inventor 陈安猛夏燕敏沙鸥沈之芹
Owner CHINA PETROLEUM & CHEM CORP
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