Sulphonated heat resistant and salt tolerant copolymer for oil field and preparation method thereof

A temperature-resistant, salt-resistant, copolymer technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of introducing monomers and less content into salt-resistant properties, introducing more monomers and their contents into copolymers, and polymerizing Acrylamide has problems such as poor temperature and salt resistance, and achieves the effect of improving salt resistance, facilitating industrial production, and improving economic efficiency.

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

[0007] One of the technical problems to be solved by the present invention is the problem of poor temperature and salt resistance of polyacrylamide under high temperature and high salinity in the prior art, and the introduction of monomers and its content into the ...

Method used

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  • Sulphonated heat resistant and salt tolerant copolymer for oil field and preparation method thereof
  • Sulphonated heat resistant and salt tolerant copolymer for oil field and preparation method thereof
  • Sulphonated heat resistant and salt tolerant copolymer for oil field and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025]Dissolve 0.75 parts of 2-acrylamido-2-methylpropanesulfonic acid in 425 parts of water, and use equimolar sodium hydroxide to dissolve the 2-acrylamido-2-methylpropanesulfonic acid solution under the condition of ice-water bath Neutralization; 74.25 parts of acrylamide are dissolved in the above-mentioned 2-acrylamido-2-methylpropanesulfonic acid solution to obtain a monomer solution, and acrylamide and 2-acrylamido-2-methylpropanesulfonic acid The mass ratio of the two monomers is 99:1, and the total mass fraction of the two monomers is 15%; then the monomer solution is poured into the reaction vessel, the temperature of the water bath is 5°C, and nitrogen gas is used to remove oxygen for 30 minutes; System, followed by: 0.3 parts of 0.6% N,N-dimethylaminoethyl methacrylate, 0.23 parts of 0.15% potassium persulfate solution, 0.13 parts of 0.09% sodium bisulfite solution; after 30 minutes of reaction, the temperature was raised to 50°C, continue the constant temperature ...

Embodiment 2

[0027] 8.75 parts of 2-acrylamido-2-methylpropanesulfonic acid were dissolved in 325 parts of water, and the 2-acrylamido-2-methylpropanesulfonic acid solution was dissolved with equimolar sodium hydroxide under the condition of ice-water bath Neutralization; 166.25 parts of acrylamide are dissolved in the above-mentioned 2-acrylamido-2-methylpropanesulfonic acid solution to obtain a monomer solution, and acrylamide and 2-acrylamido-2-methylpropanesulfonic acid The mass ratio of the two monomers is 95:5, and the total mass fraction of the two monomers is 35%; the monomer solution is poured into the reaction vessel, the temperature of the water bath is 15°C, and nitrogen gas is used to remove oxygen for 30 minutes; System, followed by: 5 parts of 5.25% N,N-dimethylaminoethyl methacrylate, 12.5 parts of 3.15% potassium persulfate solution, 12.5 parts of 15.75% sodium bisulfite solution; after 40 minutes of reaction, the temperature was raised to 45°C, continue the constant tempe...

Embodiment 3

[0029] Dissolve 10 parts of 2-acrylamido-2-methylpropanesulfonic acid in 400 parts of water, and use equimolar sodium hydroxide to dissolve the 2-acrylamido-2-methylpropanesulfonic acid solution under the condition of ice-water bath Neutralize, and then dissolve 90 parts of acrylamide in the above-mentioned 2-acrylamido-2-methylpropanesulfonic acid solution to obtain a monomer solution, and make acrylamide and 2-acrylamido-2-methylpropanesulfonic acid The mass ratio of the acid is 90:10, and the total mass fraction of the two monomers is 20%; the monomer solution is poured into the reaction vessel, the temperature of the water bath is 10° C., and nitrogen gas is used to remove oxygen for 45 minutes; then add 0.009% compound initiator System, followed by: 1 part of 0.27% N,N-dimethylaminoethyl methacrylate, 1 part of 0.27% potassium persulfate solution, 1 part of 0.54% sodium bisulfite solution; after 60 minutes of reaction, the temperature was raised to 40°C, continue the cons...

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Abstract

The invention relates to a sulphonated heat resistant and salt tolerant copolymer for an oil field and a preparation method thereof, which are mainly used for solving the problems that polyacrylamide has poor heat resistance and salt tolerance under the conditions of high temperature and high salinity, more monomers are introduced by copolymers and the content of the copolymers is high in the prior art. The problems are better solved through the technical scheme in which the sulphonated heat resistant and salt tolerant copolymer for the oil field and the preparation method thereof are provided, wherein the sulphonated heat resistant and salt tolerant copolymer for the oil field is obtained through the steps of introducing monomers with sulfonic groups on larger lateral groups to copolymerize with polyacrylamide, and then hydrolyzing. The sulphonated heat resistant and salt tolerant copolymer for the oil field, provided by the invention, can be used as an oil displacement agent for oilextraction in the oil field and can also be used in the oil field application field such as fracturing fluid thickening agent, water plugging/profile modifying agent, drilling fluid additive and the like. The preparation method provided by the invention is simple in process and easy for industrial production.

Description

technical field [0001] The invention relates to a sulfonated heat-resistant and salt-resistant copolymer for oil fields and a preparation method thereof. Background technique [0002] Tertiary oil recovery is one of the main measures to enhance oil recovery, among which polymer flooding plays an important role. The polymers used in polymer flooding are mainly partially hydrolyzed polyacrylamide (HPAM) and biopolymers. In fresh water, the electrical repulsion of the sodium carboxylate groups of HPAM molecules makes the coils of HPAM molecules stretched and has a strong ability to increase viscosity. However, in salt water, the negative charge of the carboxysodium group of HPAM molecules is shielded by cations, and the molecular coils are in a coiled state, and the viscosity-increasing ability is greatly reduced. The higher the degree of hydrolysis and the higher the content of sodium carboxylate groups, the more serious the curl of HPAM molecular coils in salt water, and th...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F4/40C09K8/588
Inventor 陈安猛夏燕敏宋晓芳蔡红
Owner CHINA PETROLEUM & CHEM CORP
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