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Hyperbranched polymer composite microspheres with core-shell structure, preparation method and application

A technology of hyperbranched polymer and composite microspheres, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of low strength, temperature difference resistance, prolonging the viscosity retention time of hyperbranched polymers, etc., which is not easy to achieve. Effects of water swelling, enhanced oil recovery, and good profile control and flooding performance

Active Publication Date: 2021-01-01
唐山冀油瑞丰化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly aims at the deficiencies in the prior art, such as poor temperature resistance of polymeric microspheres, low strength after absorbing water and swelling, and inability to decompose polymers with higher viscosity, etc., and provides a hyperbranched polymer composite microsphere with a core-shell structure. The polymer microspheres of the present invention have high temperature resistance and high strength, prolong the viscosity retention time of hyperbranched polymers, and can be adapted to higher temperature oil reservoir development and improve oil recovery

Method used

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  • Hyperbranched polymer composite microspheres with core-shell structure, preparation method and application
  • Hyperbranched polymer composite microspheres with core-shell structure, preparation method and application
  • Hyperbranched polymer composite microspheres with core-shell structure, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Add 40 parts of white oil and 10 parts of fatty alcohol polyoxyethylene ether (3) and 3.5 parts of fatty alcohol polyoxyethylene ether (15 ), heat up to 45°C, after dissolving evenly, add 5.4 parts of styrene, 2.3 parts of vinyl acetate and 0.30 parts of divinylbenzene respectively, keep the temperature at 40°C, add 0.95 parts of branching agent polypropylene to 55 parts of deionized water After fully stirring and dissolving methacrylamide at 45°C, add 38 parts of acrylamide and 3.6 parts of dimethylaminopropyl acrylamide respectively, and dissolve evenly to obtain an aqueous phase. The oil phase is stirred at a speed of 400r / min, and the water phase is added dropwise to obtain a translucent emulsion. The air was replaced with nitrogen for 0.5 h, 2 mL of 2% ammonium persulfate aqueous solution and 3 mL of 2% sodium bisulfite were added dropwise, and the mixture was reacted at a constant temperature of 40° C. for 6 h to obtain a hyperbranched polymer microsphere emulsion...

Embodiment 2

[0046] In the four-port reactor equipped with reflux condenser, thermometer, stirrer and nitrogen replacement device, add 40 parts of white oil and 12 parts of fatty alcohol polyoxyethylene ether (3) and 4 parts of fatty alcohol polyoxyethylene ether (15 ), heated up to 45°C, and after dissolving evenly, added 6 parts of styrene, 3.5 parts of vinyl acetate and 0.30 parts of divinylbenzene, and kept the temperature at 40°C. Add 1.5 parts of branching agent polyacryl (N-methyl) methacrylamide to 40 parts of deionized water, stir and dissolve fully at 45°C, add 30 parts of acrylamide and 2.5 parts of methylol acrylamide respectively, dissolve After uniformity, the aqueous phase was obtained. The oil phase is stirred at a speed of 400r / min, and the water phase is added dropwise to obtain a transparent emulsion. The air was replaced with nitrogen for 0.5 h, 2 mL of 2% ammonium persulfate aqueous solution, and 3 mL of 2% sodium bisulfite were added dropwise, and reacted at a consta...

Embodiment 3

[0048] In the four-port reactor equipped with reflux condenser, thermometer, stirrer and nitrogen replacement device, add 55 parts of white oil and 7 parts of fatty alcohol polyoxyethylene ether (3), 3 parts of fatty alcohol polyoxyethylene ether (5 parts) ) and 3.5 parts of fatty alcohol polyoxyethylene ether (9), heated up to 45°C, and after they were uniformly dissolved, 3.5 parts of styrene, 3.0 parts of vinyl acetate and 0.25 parts of divinylbenzene were added respectively, and the temperature was kept at 40°C. Add 0.80 parts of branching agent polyacrylacrylamide to 35 parts of deionized water, stir and dissolve fully at 45°C, add 26 parts of acrylamide and 3 parts of hydroxyethyl methacrylate respectively, and dissolve evenly to obtain an aqueous phase. The oil phase is stirred at a speed of 400r / min, and the water phase is added dropwise to obtain a transparent emulsion. The air was replaced with nitrogen for 0.5 h, 2 mL of 2% ammonium persulfate aqueous solution and 2...

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Abstract

The invention relates to a hyper-branched polymer composite microsphere with a core-shell structure. The hyper-branched polymer composite microsphere is characterized by being a composite structure for an inner core and a shell layer, wherein the inner core is hyper-branched polymer; and the shell layer is polystyrene-vinyl acetate. The invention further discloses a preparation method and application of the hyper-branched polymer composite microsphere emulation with the core-shell structure. In a practical producing and using process of the composite microsphere, a great deal of hydroxyl is generated on the surface after polystyrene-vinyl acetate of the shell layer is hydrolyzed, so that hydrophily is achieved, and therefore, dispersion in water is facilitated. When the ground layer temperature is lower than 80 DEG C, the polystyrene-vinyl acetate shell layer material can be kept for a long time without decomposition; when the temperature is 120 DEG C, the polystyrene-vinyl acetate shell material can be crushed within 2-3 months, so that hyper-branched polymer inside is released; and polymer with viscosity is gradually generated as hyper-branched polymer absorbs water for being expanded and decomposed, and viscosity can be kept for 2-3 months.

Description

technical field [0001] The invention relates to a method for preparing functional composite microspheres with a core-shell structure, which belongs to the technical field of preparation of functional polymer microspheres, in particular to a microsphere with a hyperbranched polymer as the core, its preparation method and application, and belongs to the field of petroleum In the field of engineering enhanced oil recovery, it is used as an acid liquid diverting agent for deep profile control and water control of oil reservoirs or acidizing and plugging removal. Background technique [0002] In the process of oil exploitation, water flooding and tertiary oil recovery are the most important technologies for enhancing oil recovery. Due to the heterogeneity of the reservoir, the displacement fluid of water flooding and chemical flooding will flow along the high permeability zone, which reduces the swept volume and seriously affects the oil recovery efficiency. Therefore, improving...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/60C08F212/08C08F218/08C08F212/36C08F2/38C08F220/58C08F220/20C08F220/54C09K8/502C09K8/588C09K8/74
CPCC08F2/38C08F220/56C09K8/502C09K8/588C09K8/74C08F220/60C08F212/08C08F218/08C08F212/36C08F220/58C08F220/20C08F220/54
Inventor 乔孟占潘凤英董彦龙聂坤李玲王丽娟党光明刘帅杨晓拂
Owner 唐山冀油瑞丰化工有限公司
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