Long-branched chain polyacrylamide copolymer and preparation method thereof

A polyacrylamide and acrylamide technology, which is applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of lack of mature polyacrylamide products for oil displacement, and achieve chemical stability and improve viscoelasticity. , the effect of reducing the interfacial tension

Active Publication Date: 2012-03-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the current three types of oil reservoir resources, the formation temperature is 70-95°C, and the formation salinity is 10,000-30,000mg / L. There are still no mature and commercial polyacrylamide products for oil displacement.

Method used

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  • Long-branched chain polyacrylamide copolymer and preparation method thereof
  • Long-branched chain polyacrylamide copolymer and preparation method thereof
  • Long-branched chain polyacrylamide copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 6g of acrylamide, 3.5g of 2-acrylamido-2-methylpropanesulfonic acid and 0.5g of triethoxyvinylsilane into the polymerization reaction bottle, and then add 1% sodium lauryl sulfate aqueous solution in sequence 1.0g, 0.5g of 1% urea aqueous solution, dissolved in 23.0g of deionized water, then added sodium hydroxide to adjust the pH to 7.0, put the polymerization reaction bottle in a constant temperature water bath, emulsified nitrogen gas to drive oxygen for 30 minutes, then added 0.1% 1.0 g of potassium persulfate aqueous solution and 1.0 g of 0.1% potassium bisulfite aqueous solution were used to initiate the reaction at 10° C. and stop after continuing to pass nitrogen gas for five minutes. After 2 hours of polymerization reaction, the temperature was raised to 50° C. to continue the reaction for 3 hours to obtain milky white of latex particles. The latex particles are taken out, dried after demulsification, crushed, and sieved to obtain a white long-chain branche...

Embodiment 2

[0032] Add 5g of acrylamide, 4.9g of 2-acrylamido-2-methylpropanesulfonic acid and 0.1g of acryloxypropyltriethoxysilane into the polymerization reaction bottle, and then add 1% of dodecyl Dissolve 5.0 g of sodium sulfate aqueous solution, 1.0 g of 1% urea aqueous solution, and 23.0 g of deionized water, then add sodium hydroxide to adjust the pH to 8.0, put the polymerization reaction bottle in a constant temperature water bath, emulsify and pass nitrogen gas to drive oxygen for 30 minutes, Add 2.0 g of 0.1% ammonium persulfate aqueous solution and 2.0 g of 0.1% potassium bisulfite aqueous solution, initiate the reaction at 15°C, continue to pass nitrogen for five minutes and then stop, after 2 hours of polymerization reaction, raise the temperature to 50°C and continue the reaction for 4 hours , to obtain milky white latex particles. The latex particles are taken out, dried after demulsification, crushed, and sieved to obtain a white long-chain branched acrylamide copolymer....

Embodiment 3

[0034] Add 6g of acrylamide, 3.7g of 2-acrylamido-2-methylpropanesulfonic acid and 0.3g of triacetoxyvinylsilane into the polymerization reaction bottle, and then add 1% of dodecylbenzenesulfonic acid in sequence Dissolve 2.0 g of sodium aqueous solution, 0.5 g of 1% urea aqueous solution, and 23.0 g of deionized water, then add sodium hydroxide to adjust the pH to 9.0, put the polymerization reaction bottle in a constant temperature water bath, emulsify and pass nitrogen gas to drive oxygen for 30 minutes, then add 0.1% ammonium persulfate aqueous solution 5.0g and 0.1% sodium bisulfite aqueous solution 5.0g, initiate reaction at 20 DEG C, stop after continuing to feed nitrogen for five minutes, polymerize after 6 hours, be warming up to 50 DEG C and continue reaction for 3 hours, Milky white latex particles were obtained. The latex particles are taken out, dried after demulsification, crushed, and sieved to obtain a white long-chain branched acrylamide copolymer. The tested...

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Abstract

The invention discloses a long-branched chain polyacrylamide copolymer. The structural formula of the long-branched chain polyacrylamide copolymer is shown as formula (1). An organic silicon monomer with temperature resistance and salt resistance is introduced into an acrylamide copolymer so as to improve the temperature resistance and salt resistance of polyacrylamide; the introduction of a long-branched chain organic silicon flexible chain greatly improves the entwisting capability of a polymer molecular chain so as to improve the viscoelasticity of the polymer for reducing the interface tension of a grafting copolymer solution and improve the affinity of displacing fluid and displaced fluid in practical use; and a copolymer main chain is formed by copolymerizing the organic silicon monomer, acrylamide and monomers with temperature resistance and salt resistance, such as 2-acrylamino-2-methy propanesulfonic acid, N-vinyl pyrrolidone, N,N-dimethyl acrylyl and the like, thereby ensuring the chemical stability of the main chain.

Description

technical field [0001] The invention relates to a long-chain branched acrylamide copolymer and a preparation method thereof, and belongs to the research field of water-soluble polymers and enhanced oil recovery of tertiary oil recovery. Background technique [0002] Tertiary oil recovery has become one of the main measures to enhance oil recovery in my country. At present, the polymer used for oil displacement is mainly partially hydrolyzed polyacrylamide. As a water-soluble polymer oil displacement agent with excellent performance, it has been widely used in enhanced oil recovery. However, the aqueous solution of partially hydrolyzed polyacrylamide also has certain defects in application, such as high shear rate will cause viscosity loss; it is easy to degrade when placed for a long time or at a higher temperature; Acrylamide viscosity loss is severe. These defects affect the full play of polyacrylamide. Therefore, the research on temperature-resistant and salt-resistant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F230/08C08F220/58C08F226/10C08F4/40C08F2/24C09K8/588
Inventor 赵方园黄凤兴杜凯刘晓光林蔚然刘希祝纶宇计文希魏小林伊卓
Owner CHINA PETROLEUM & CHEM CORP
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