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A kind of zwitterionic starch microsphere and its preparation method and application

A technology of zwitterions and starch microspheres, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., to achieve high content of microspheres, remarkable temporary plugging effect, and uniform particle size distribution

Active Publication Date: 2020-10-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on homogeneously distributed polydisperse starch microspheres

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 13 parts of potato starch and add to 100 parts of deionized water, then add 10 parts of triethanolamine, fully dissolve at 75°C. Then add 0.013 parts of epichlorohydrin, mix and react for 2.5h. Weigh 7 parts of DMAPS into the starch solution, fully dissolve and mix. Add 0.03 parts of potassium persulfate at 65°C and react for 5 hours. Add 5 parts of dimethyl dodecyl sulfonyl butyl ammonium salt and mix well. Weigh 38 parts of NaCl to prepare 170 parts of inorganic salt solution, and drop them into the starch solution simultaneously with 1.5 parts of epichlorohydrin at 40°C for 6 hours at a constant speed. After the dropwise addition, the reaction was continued for 2 hours to obtain evenly distributed polydisperse starch microspheres. The particle size distribution range of the starch microspheres is 10-170 μm (94.2% of the particle size is within this range), and the particle size distribution in the particle size distribution range has the following characteri...

Embodiment 2

[0040] Weigh 5 parts of potato starch and add to 100 parts of deionized water, then add 22 parts of triethanolamine, fully dissolve at room temperature. Then add 0.04 epichlorohydrin, mix and react for 2h. Weigh 6 parts of MAPS into the starch solution, fully dissolve and mix. Add 0.07 parts of ammonium persulfate at 70°C and react for 4 hours. Add 1 part dimethyl cetyl sulfonium ethyl ammonium salt and mix well. Weigh 0.5 parts of CaCl 2 Prepare 33 parts of inorganic salt solution, drop them into the starch solution simultaneously with 7.5 parts of epichlorohydrin at 60°C, and drop them at a constant speed for 8 hours. After the dropwise addition, the reaction was continued for 2 hours to obtain evenly distributed polydisperse starch microspheres. The particle size distribution range of the starch microspheres is 120-400 μm (97.1% of the particle size is within this range), and the particle size distribution in the particle size distribution range has the following charac...

Embodiment 3

[0042] Weigh 20 parts of tapioca starch into 100 parts of deionized water, then add 20 parts of triethanolamine, and fully dissolve at 40°C. Then add 0.3 parts of epichlorohydrin, mix and react for 1h. Weigh 13 parts of DAPS into the starch solution, fully dissolve and mix. Add 0.105 parts of sodium persulfate at 80°C and react for 3 hours. Add 10 parts of dimethyl octadecyl sulfonyl butyl ammonium salt and mix well. Weigh 16 parts of MgCl 2 Prepare 150 parts of inorganic salt solution, drop it into the starch solution simultaneously with 14 parts of epichlorohydrin at 40°C, and add it dropwise at a constant speed for 10 hours. After the dropwise addition, the reaction was continued for 2 hours to obtain evenly distributed polydisperse starch microspheres. The concentrated particle size distribution range of the starch microspheres is 50-300 μm (95.4% of the particle sizes are within this range), and the particle size distribution in the concentrated particle size distribu...

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Abstract

The invention discloses zwitterionic starch microspheres and a preparation method and application thereof. The raw materials of the zwitterionic starch microspheres comprise: 100 parts of deionized water, 1-20 parts of starch, 10-50 parts of triethanolamine, 0.105-14.6 parts of epichlorohydrin, 0.1-20 parts of a zwitterionic monomer, 0.001-0.2 part of an initiator, 0.05-10 parts of a zwitterionicsurfactant, and 0.5-200 parts of an inorganic salt solution including 0.025-50 parts of an inorganic salt solute. The starch microspheres have a particle diameter of 0.1 to 500 [mu]m and have uniformly distributed polydispersity. The zwitterionic starch microspheres prepared by the method are polydisperse starch microspheres with uniform particle size distribution.

Description

technical field [0001] The invention belongs to the technical field of microspheres, and in particular relates to a zwitterionic starch microsphere and a preparation method and application thereof. Background technique [0002] Shielding temporary plugging to protect oil and gas layer drilling technology (referred to as shielding temporary plugging technology) is mainly used to solve the problem of protecting oil and gas layers in multi-pressure formations in open hole sections, that is, to use two factors that damage oil and gas layers during drilling into oil and gas layers. The unfavorable factors (pressure difference and drilling fluid solid phase particles) are converted into favorable factors to protect oil and gas layers, and the purpose of reducing the damage to oil and gas layers caused by drilling fluid, cement slurry, pressure difference and soaking time is achieved. [0003] The basic idea of ​​shielding temporary plugging protection oil and gas layer drilling te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/516E21B33/13C08B31/12C08B31/00
CPCC08B31/003C08B31/12C09K8/516E21B33/13
Inventor 杨超王晨尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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