Anion-cation composite core-shell structure polymer microsphere and preparation method thereof

A technology of polymers and microspheres, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of insufficient migration ability of polymer profile control agents, and achieve good depth profile control effect and good technical effect Effect

Inactive Publication Date: 2019-04-23
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 migration ability of the existing polymer profile control agents in the formation. For this reason, the present invention provides a polymer microsphere with an anion-yang composite core-shell structure. The core-shell structure of the microspheres enables the polymer to reach the specified depth at a fixed point in the formation to achieve depth profile control

Method used

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  • Anion-cation composite core-shell structure polymer microsphere and preparation method thereof
  • Anion-cation composite core-shell structure polymer microsphere and preparation method thereof
  • Anion-cation composite core-shell structure polymer microsphere and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Dissolve 40 parts of acrylamide, 15 parts of methacryloxyethyltrimethylammonium chloride, 0.02 parts of disodium edetate, 1 part of polyethylene glycol 20000, and 1 part of tert-butylacrylamide in 60 Part water and 200 parts ethanol in the mixed solvent configuration and stir evenly. The solution was added to the reaction kettle, the stirring rate was 200r / min, the inert gas was passed through, and the temperature of the water bath was 50°C. After continuous stirring for 30min, the composite initiator system (22mg ammonium persulfate, 20mg sodium bisulfite, 15mg tetramethylethylenediamine, 30mg azobisisobutyl ether hydrochloride) was dissolved in 5g ethanol and water at a ratio of 7 : 3 mixed solvents, dropwise into the reaction kettle. The reaction was continued for 1 hour.

[0056] Dissolve 40 parts of acrylamide, 10 parts of 2-acrylamido-dimethylpropanesulfonic acid, 0.02 parts of disodium edetate, 1 part of polyethylene glycol 20000, and 1 part of tert-butylacryla...

Embodiment 2

[0061] Dissolve 40 parts of acrylamide, 15 parts of methacryloxyethyltrimethylammonium chloride, 0.02 parts of disodium edetate, 1 part of polyethylene glycol 20000, and 1 part of tert-butylacrylamide in 60 Part water and 200 parts ethanol in the mixed solvent configuration and stir evenly. The solution was added to the reaction kettle, the stirring rate was 200r / min, the inert gas was passed through, and the temperature of the water bath was 50°C. After continuous stirring for 30min, the composite initiator system (22mg ammonium persulfate, 20mg sodium bisulfite, 15mg tetramethylethylenediamine, 30mg azobisisobutyl ether hydrochloride) was dissolved in 5g ethanol and water at a ratio of 7 : 3 mixed solvents, dropwise into the reaction kettle. The reaction was continued for 1 hour.

[0062] Dissolve 20 parts of acrylamide, 5 parts of 2-acrylamido-dimethylpropanesulfonic acid, 0.01 parts of disodium edetate, 0.5 parts of polyethylene glycol 20000, 0.5 parts of tert-butylacryl...

Embodiment 3

[0067] Dissolve 40 parts of acrylamide, 10 parts of 2-acrylamido-dimethylpropanesulfonic acid, 0.02 parts of disodium edetate, 1 part of polyethylene glycol 20000, and 1 part of tert-butylacrylamide in 60 parts Stir evenly in the mixed solvent of water and 200 parts of ethanol configuration. The solution was added to the reaction kettle, the stirring rate was 200r / min, the inert gas was passed through, and the temperature of the water bath was 50°C. After continuous stirring for 30min, the composite initiator system (22mg ammonium persulfate, 20mg sodium bisulfite, 15mg tetramethylethylenediamine, 30mg azobisisobutyl ether hydrochloride) was dissolved in 5g ethanol and water at a ratio of 7 : 3 mixed solvents, dropwise into the reaction kettle. The reaction was continued for 1 hour.

[0068] Dissolve 40 parts of acrylamide, 15 parts of methacryloxyethyltrimethylammonium chloride, 0.02 parts of disodium edetate, 1 part of polyethylene glycol 20000, and 1 part of tert-butylacr...

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Abstract

The invention relates to an anion-cation composite core-shell structure polymer microsphere and a preparation method thereof. A purpose of the present invention is mainly to solve the problems of failure of the diene-based cross-linking agent, easy adhesion of microspheres and the like in dispersion polymerization and the problem of underground deep profile control and transfer of polyacrylamide microsphere-based products. According to the technical scheme, the polyacrylamide-based polymer gel microsphere is used, and comprises the following structure units: a polymer microsphere core part comprising an acrylamide structure unit, an ionic monomer I structure unit, a nonionic monomer I structure unit and a stabilizer I structure unit, and a polymer microsphere shell part comprising an acrylamide structure unit, an ionic monomer II structure unit, a nonionic monomer II structure unit and a stabilizer II structure unit, and a cross-linking agent structure unit reacts with the polymer chain in the core-shell structure of the polymer microsphere to form a cross-linking structure after a nucleation reaction and a shell formation reaction. With the technical scheme, the problems in the prior art are well solved. The anion-cation composite core-shell structure polymer microsphere can be used for deep profile control in oilfield development.

Description

technical field [0001] The invention relates to an anion-yang composite polymer microsphere with a monodisperse core-shell structure prepared by a post-crosslinking method, in particular to a micron-sized polyacrylamide composite microsphere, which can be used as a deep profile control plugging in tertiary oil recovery Aqueous use. Background technique [0002] Petroleum is one of the important sources of energy for modern industry and an important source of basic raw materials for the chemical industry. With the continuous exploitation of existing crude oil in oil fields, the difficulty and cost of oil exploitation gradually increase, and the economic benefits of exploitation decrease, which is not conducive to Survival and development of oil fields in the era of low oil prices. At the same time, the natural decline of crude oil production also increases the pressure on oil field exploitation, which is not conducive to the national energy strategy security and economic dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/10C08F220/56C08F220/34C08F220/54C08F220/58C08J3/24C09K8/512C09K8/516
CPCC09K8/5083C09K8/512C09K8/516C08F220/56C08F265/10C08J3/24C08J2351/00C08F220/585C08F220/54C08F220/34
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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