Multi-crosslinking core-shell type polymer microsphere, modifying and flooding agent, and preparation method and application thereof
A polymer, core-shell technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of whether the expansion performance, elasticity and heat resistance stability of polymer microspheres can be enhanced at the same time.
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Embodiment 1
[0039] First add 660g 7# white oil, 70gSPAN80, 8gTWEEN80 in the reaction kettle, stir until completely mixed, as a mixed oil phase; add 260g water, 8g silica sol (40% content), 320g acrylamide, 50g of methacryloylpropyltrimethylammonium chloride, 18g of potassium acetate, 0.5g of sodium diethylenetriaminepentaacetate, 12g of urea, 1.0g of methylenebisacrylamide, stirred and dissolved evenly as the water phase I; Add 280g of water, 10g of CTAB-modified nano-montmorillonite DK1 (Zhejiang Fenghong Clay Chemical Co., Ltd.), 300g of acrylamide, 100g of sodium acrylate, 18g of potassium acetate, 0.5g of sodium diethylenetriaminepentaacetate, and 0.5g of iso Propanol 10g, urea 12g, methylenebisacrylamide 0.8g, stir the solvent evenly, add 20g of isopropanol solution with 2g of azobisisobutyronitrile, stir and dissolve together as water phase II; Ammonium and sodium bisulfite were respectively configured into 2.0% and 0.2% aqueous solutions for later use. Slowly add the water phase I...
Embodiment 2
[0042] First add 660g 5# white oil, 72gSPAN80, 5gTWEEN60 in the reaction kettle, stir until completely mixed, as a mixed oil phase; add 270g water, 7g silica sol (40% content), 300g acrylamide, 80g of methacryloylpropyltrimethylammonium chloride, 18g of sodium acetate, 0.5g of ethylenediaminetetraacetic acid disodium salt, 12g of urea, and 1.1g of methylenebisacrylamide, stirred and dissolved evenly as the water phase I; In another container, add 270g water, 11g dodecyl dihydroxy ammonium modified nano-montmorillonite DK2 (Zhejiang Fenghong Clay Chemical Co., Ltd.), 300g acrylamide, 120g 2-acrylamido-2-methylpropane Sodium sulfonate, sodium acetate 18g, edetate disodium salt 0.5g, isopropanol 10g, urea 12g, polyethylene glycol diacrylate 2.0g, stir the solvent evenly and add 2g azobisisoheptyl 20g of isopropanol solution of nitrile was stirred and dissolved uniformly as the water phase II; ammonium persulfate and sodium bisulfite were respectively prepared into 2.0% and 0.2% a...
Embodiment 3
[0045]First add 680g 120# solvent oil and 78g SPAN60 to the reaction kettle, stir until completely mixed, as a mixed oil phase; add 270g water, 15g silica sol (40%), 300g acrylamide, 110g acrylamide to a container of a certain size Oxyethyltrimethylammonium chloride, sodium acetate 20g, ethylenediaminetetraacetic acid disodium salt 1.0g, isopropanol 15g, urea 10g, pentaerythritol triacrylate 2.1g, stirred and dissolved evenly as water phase I; Add 270g water, 7g octadecyl dimethyl benzyl ammonium chloride modified nano-montmorillonite DK4 (Zhejiang Fenghong Clay Chemical Co., Ltd.), 300g acrylamide, 150g sodium vinylbenzene sulfonate, Sodium acetate 20g, edetate disodium salt 0.5g, urea 12g, stir the solvent evenly, add 20g of isopropanol solution with 2g of azobisisoheptanonitrile and 1.0g of divinylbenzene, and stir together to dissolve Uniformly used as the aqueous phase II; ammonium persulfate and sodium bisulfite were respectively prepared into 2.0% and 0.2% aqueous solut...
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