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Temperature and salt resistant copolymer for oil field 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 of easy hydrolysis of polyacrylamide, achieve improved hydrolysis stability, simple process flow, and increase crude oil recovery Yield effect

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is the problem that partially hydrolyzed polyacrylamide is easy to hydrolyze under high temperature and high salinity in the prior art, and a new copolymer KWKY-PAD is provided, which has good hydrolytic stability advantage

Method used

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  • Temperature and salt resistant copolymer for oil field and preparation method thereof
  • Temperature and salt resistant copolymer for oil field and preparation method thereof
  • Temperature and salt resistant copolymer for oil field and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 69.3 parts of acrylamide and 5.7 parts of N,N-dimethylacrylamide were dissolved in 422 parts of water, so that the total mass fraction of the two monomers of acrylamide and N,N-dimethylacrylamide was 15%; 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 water bath temperature at 5°C, and pass nitrogen gas to remove oxygen for 30 minutes; then add 0.003% composite initiator system: 0.15% super 0.23 parts of potassium sulfate 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 30°C, and the constant temperature polymerization was continued for 4 hours Afterwards, 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°C, then vacuum-dry and pulverize to obtain the temperature-resistant and salt-re...

Embodiment 2

[0025] 95 parts of acrylamide and 80 parts of N,N-diethylacrylamide were dissolved in 293 parts of water, so that the total mass fraction of the two monomers of acrylamide and N,N-diethylacrylamide was 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 pass nitrogen to deoxygenate for 30 minutes; then add 1.5% composite initiator system: 3.15% 12.5 parts of potassium persulfate solution, 12.5 parts of 15.75% sodium bisulfite solution, 5 parts of 5.25% N,N-dimethylaminoethyl methacrylate; after 60 minutes of reaction, the temperature was raised to 50°C, and the constant temperature polymerization was continued for 12 Hours later, stop the reaction, add 71.3 g of 15% sodium hydroxide solution to the obtained colloidal product, and hydrolyze it for 3 hours at 90 ° C, then vacuum-dry and pulverize to obtain the temperature-resistant and salt-resistant c...

Embodiment 3

[0027] 138.6 parts of acrylamide and 11.4 parts of N,N-dimethylacrylamide were dissolved in 340 parts of water, so that the total mass fraction of the two monomers of acrylamide and N,N-dimethylacrylamide was 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 water bath temperature at 5°C, and pass nitrogen gas to remove oxygen for 30 minutes; then add 0.03% composite initiator system: 0.76% super 5 parts of potassium sulfate solution, 1 part of 0.23% sodium bisulfite solution, 1 part of 0.45% N,N-dimethylaminoethyl methacrylate; after 60 minutes of reaction, the temperature was raised to 30°C, and the constant temperature polymerization was continued for 12 hours Afterwards, stop the reaction, add 157.6 g of 10% sodium hydroxide solution to the obtained colloidal product, and hydrolyze it for 2 hours at 90 ° C, then vacuum-dry and pulverize to obtain the temperature-resistant and salt-resista...

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Abstract

The invention relates to a temperature and salt resistant copolymer KWKY-PAD for oil field and a preparation method thereof, and mainly solves the problem that polyacrylamide is easy to hydrolyze at high temperature and high salinity in the prior art. The temperature and salt resistant copolymer KWKY-PAD as shown in formula (I) is obtained by the copolymerization of acrylamide and a N-alkyl substituted acrylamide derivative. The technical scheme provided by the invention greatly solves the problem. By the adoption of the preparation method, the hydrolytic stability of the copolymer is raised,and the copolymer has good viscosifying ability and hydrolytic stability at high temperature and high salinity as well as good temperature and salt resistance. The copolymer provided by the inventioncan be used in an oil displacement agent for oil extraction in oil field, and also can be used in oil field application fields of a thickening agent of fracturing fluids, a water plugging profile modification agent, a drilling fluid processing agent and the like. In addition, the preparation method requires less monomer, is simple and is suitable for industrialization.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant copolymer KWKY-PAD for oil fields and a preparation method thereof. Background technique [0002] With the development of petroleum exploration and development, tertiary oil recovery has begun to use some high-temperature and high-salinity oil reservoirs, such as the third-type oil reservoirs in Shengli Oilfield, whose salinity is above 30,000mg / L and the temperature is 80-93°C. In such reservoirs, common partially hydrolyzed polyacrylamide is easy to be hydrolyzed, resulting in greatly reduced viscosity-increasing ability, and cannot play a good role in enhancing oil recovery. Therefore, there is an urgent need for a temperature-resistant and salt-resistant polymer product with improved hydrolytic stability under the condition of high temperature and high salinity. At present, many researchers have carried out a lot of research, starting from the idea of ​​molecular structure design,...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/54C09K8/588
Inventor 陈安猛周文乐夏燕敏宋晓芳蔡红
Owner CHINA PETROLEUM & CHEM CORP
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