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Multi-network monodisperse polyacrylamide polymer gel microspheres and preparation method thereof

A technology of polyacrylamide and gel microspheres, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of insufficient stability of polymer microspheres, achieve uniform particle size, long service life, good The effect of blocking ability

Active Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is to solve the problem of insufficient stability of existing polymer microspheres under high-temperature and high-salt conditions, and provide a multi-network type monodisperse polyacrylamide polymer gel microsphere, through The quadruple cross-linked network of covalent bond chemical cross-linking, anion-cation pair cross-linking, high-valent metal chelation cross-linking and polymer chain entanglement cross-linking is introduced into the microspheres, which endows the microspheres with a strong network structure and endows the microspheres with Excellent aging stability ensures its stable and effective sealing ability in long-term service in the underground environment

Method used

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  • Multi-network monodisperse polyacrylamide polymer gel microspheres and preparation method thereof
  • Multi-network monodisperse polyacrylamide polymer gel microspheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 30 parts of acrylamide, 15 parts of methacryloxyethyltrimethylammonium chloride, 15 parts of 2-acrylamido-dimethylpropanesulfonic acid, 5 parts of acrylic acid, 0.02 parts of disodium edetate , 1 part of polyvinyl alcohol, 0.2 part of polyvinyl grade pyrrolidone, 0.2 part of methylenebisacrylamide, 1 part of tert-butylacrylamide dissolved in a mixed solvent of 120 parts of water and 400 parts of ethanol and stirred evenly. The solution was added to the reaction kettle, the stirring rate was 100r / min, the inert gas was passed through, and the temperature of the water bath was 30°C. After continuous stirring for 30 min, the composite initiator system was added dropwise into the reaction kettle respectively. The reaction was continued for 1 hour.

[0050] Dissolve 2 parts of zirconium acetate in a mixed solvent prepared with 6 parts of water and 20 parts of ethanol, slowly drop it into the reaction kettle, adjust the pH value to 3-5 with hydrochloric acid, raise the tempe...

Embodiment 2

[0054] 30 parts of acrylamide, 5 parts of methacryloxyethyltrimethylammonium chloride, 5 parts of 2-acrylamido-dimethylpropanesulfonic acid, 5 parts of acrylic acid, 0.02 parts of disodium edetate , 1 part of polyvinyl alcohol, 0.2 part of polyvinyl grade pyrrolidone, 0.2 part of methylenebisacrylamide, 1 part of tert-butylacrylamide dissolved in a mixed solvent of 120 parts of water and 400 parts of ethanol and stirred evenly. The solution was added to the reaction kettle, the stirring rate was 100r / min, the inert gas was passed through, and the temperature of the water bath was 30°C. After continuous stirring for 30 min, the composite initiator system was added dropwise into the reaction kettle respectively. The reaction was continued for 1 hour.

[0055] Dissolve 2 parts of zirconium acetate in a mixed solvent prepared with 6 parts of water and 20 parts of ethanol, slowly drop it into the reaction kettle, adjust the pH value to 3-5 with hydrochloric acid, raise the tempera...

Embodiment 3

[0059] 30 parts of acrylamide, 15 parts of methacryloxyethyltrimethylammonium chloride, 15 parts of 2-acrylamido-dimethylpropanesulfonic acid, 5 parts of acrylic acid, 0.02 parts of disodium edetate , 1 part of polyvinyl alcohol, 0.2 part of polyvinyl grade pyrrolidone, 0.05 part of methylenebisacrylamide, and 1 part of tert-butylacrylamide were dissolved in a mixed solvent of 120 parts of water and 400 parts of ethanol and stirred evenly. The solution was added to the reaction kettle, the stirring rate was 100r / min, the inert gas was passed through, and the temperature of the water bath was 30°C. After continuous stirring for 30 min, the composite initiator system was added dropwise into the reaction kettle respectively. The reaction was continued for 1 hour.

[0060] Dissolve 2 parts of zirconium acetate in a mixed solvent prepared with 6 parts of water and 20 parts of ethanol, slowly drop it into the reaction kettle, adjust the pH value to 3-5 with hydrochloric acid, raise...

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Abstract

The invention relates to a multi-network type monodispersed polyacrylamide-based polymer gel microsphere and a preparation method thereof. A purpose of the present invention is mainly to solve the problem of insufficient stability of the existing polymer microspheres under high temperature and high salt conditions. According to the technical scheme, the polyacrylamide-based polymer gel microspherecomprises an acrylamide structure unit, an anionic monomer structure unit, a cationic monomer structure unit and a nonionic monomer structure unit, and further comprises a covalent bond cross-linkingagent structure unit, a high-valent metal cross-linking agent structure unit and a stabilizer structure unit, wherein the acrylamide structure unit, the anionic monomer structure unit, the cationic monomer structure unit and the nonionic monomer structure unit form a polymer main chain structure. With the technical scheme, the problem in the prior art is well solved. The product of the present invention can be used for deep profile control in oilfield development.

Description

technical field [0001] The invention relates to a polyacrylamide microsphere containing a quadruple crosslinked network, in particular to a micron-sized polyacrylamide composite crosslinked microsphere, which can be used as a deep profile control and water shutoff agent in tertiary oil recovery . Background technique [0002] With the development of modern industry, the demand for energy is increasing, but the traditional fossil energy is constantly being consumed with the continuous mining, and the energy crisis has become the main problem of economic development in various countries. Petroleum is an important part of fossil energy, known as the blood of modern industry. However, with the continuous development of oil fields, the difficulty of oil extraction gradually increases, the cost gradually increases, and the economic benefits of extraction decrease. The natural decline of crude oil production is the main problem faced by old oilfields, which brings huge pressure o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/516C08F220/56C08F220/34C08F222/38C08F220/06
CPCC08F220/56C09K8/512C09K8/516C08F220/34C08F222/385C08F220/06
Inventor 苏智青李应成夏燕敏许汇宋晓芳王兰
Owner CHINA PETROLEUM & CHEM CORP
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