Polyacrylate grafted graphene oxide plugging agent and oil-based drilling fluid

[0040] ①Weigh 1g of graphene oxide, disperse it in 180mL of absolute ethanol and stir ultrasonically for 30min, slowly add 80mL of (3-aminopropyl)trimethoxysilane ethanol solution, and stir at 35°C for 13h. The product was precipitated in n-hexane, then centrifuged at 6000rpm for 10min, washed with acetone, and finally dried at 60°C for 25h to obtain product A;

[0041]②Weigh 1g of product A, disperse product A in 12mL methanol solution, stir ultrasonically for 30min, then transfer to the reactor, under nitrogen protection and the temperature is 0 ℃, slowly add 12mL methyl acrylate methanol solution, and react The device was placed in a dark place, and stirred at 25 °C for 3 days. After stirring, the product was washed with ethanol, and the product was precipitated in n-hexane. Finally, it was dried at 60 °C for 25 hours to obtain product B;

[0042] 3. Weigh 1 g of product B, disperse product B in methanol solution, stir ultrasonically for 30 min, slowly add 80 mL of acrylamide

[0044] ①Weigh 1g of graphene oxide, disperse it in 190mL of absolute ethanol and stir ultrasonically for 35min, slowly add 80mL of (3-aminopropyl)trimethoxysilane ethanol solution, and stir at 40°C for 13h. The product was precipitated in n-hexane, then centrifuged at 8000rpm for 10min, washed with acetone, and finally dried at 60°C for 25h to obtain product A;

[0045] ②Weigh 1g of product A, disperse product A in 12mL methanol solution, stir ultrasonically for 35min, then transfer to the reactor, under nitrogen protection and the temperature is 1 ℃, slowly add 12mL ethyl methacrylate methanol solution, The reactor was placed in a dark place and stirred at 30°C for 3 days. After stirring, the product was washed with ethanol, and the product was placed in n-hexane for precipitation. Finally, it was dried at 60°C for 25 hours to obtain product B. ;

[0046] 3. Weigh 1 g of product B, disperse product B in methanol solution, stir ultrasonically for 35 min, slowly add 80 mL of N-is

[0048] ①Weigh 1g of graphene oxide, disperse it in 190mL of absolute ethanol and stir it ultrasonically for 35min, slowly add 80mL of 3-aminopropyltriethoxysilane ethanol solution, and stir at 40°C for 13h. Placed in n-hexane for precipitation, then centrifuged at 7000rpm for 12min, washed the product with acetone, and finally dried at 70°C for 28h to obtain product A;

[0049] ②Weigh 1g of product A, disperse product A in 14mL methanol solution, stir ultrasonically for 35min, then transfer to the reactor, under nitrogen protection and the temperature is 2 ℃, slowly add 14mL ethyl acrylate methanol solution to react The device was placed in a dark place, and stirred at 30 °C for 3 days. After stirring, the product was washed with ethanol, and the product was precipitated in n-hexane. Finally, it was dried at 70 °C for 28 hours to obtain product B;

[0050] 3. Weigh 1 g of product B, disperse product B in methanol solution, stir ultrasonically for 35 min, slowly add 80 mL of N-ter