▎ 摘　　要

NOVELTY - Functionalized graphene oxide plugging agent comprises graphene oxide, styrene, acrylate compound, persulfate, acrylic acid compound, sodium dodecyl sulfate, aminosilane compound, nonylphenol polyoxyethylene ether. The functionalized graphene oxide plugging agent is prepared by adding styrene, an acrylate compound, an acrylic compound, nonylphenol polyoxyethylene ether and persulfate into a reactor filled with distilled water, stirring for 30-40min under the protection of nitrogen, then reacting for 2-3h at 60-80 ℃, then adding persulfate, and then continuing to react for 2-3h at 70-80 ℃ to obtain a product A. The aminosilane compound is dispersed into ethanol, ultrasonically stirred for 30-40min, then graphene oxide is added, continuously ultrasonically stirred for 5-10min, reacted for 6-8h at the temperature of 80-90 ℃, a product is washed with ethanol, finally dried at the temperature of 60-70 ℃, and crushed to obtain a product B. USE - Functionalized graphene oxide plugging agent used in oil-based drilling fluid. ADVANTAGE - The functionalized graphene oxide plugging agent can effectively stabilize the well wall, prevent collapse, has small influence on the performance of the drilling fluid, which is good for reducing drilling fluid loss. The oil-based drilling fluid has good performance in the flow denaturation under the condition of shale formation, water-loss wall-making property and plugging property. DETAILED DESCRIPTION - Functionalized graphene oxide plugging agent comprises graphene oxide, styrene, acrylate compound, persulfate, acrylic acid compound, sodium dodecyl sulfate, aminosilane compound, nonylphenol polyoxyethylene ether. The functionalized graphene oxide plugging agent is prepared by adding styrene, an acrylate compound, an acrylic compound, nonylphenol polyoxyethylene ether and persulfate into a reactor filled with distilled water, stirring for 30-40min under the protection of nitrogen, then reacting for 2-3h at 60-80 ℃, then adding persulfate, and then continuing to react for 2-3h at 70-80 ℃ to obtain a product A. The aminosilane compound is dispersed into ethanol, ultrasonically stirred for 30-40min, then graphene oxide is added, continuously ultrasonically stirred for 5-10min, reacted for 6-8h at the temperature of 80-90 ℃, a product is washed with ethanol, finally dried at the temperature of 60-70 ℃, and crushed to obtain a product B. The product B is added into the product A, ultrasonic dispersion is performed for 30-40min, then reacted for 6-8h at the temperature of 70-80 ℃ to obtain new functionalized graphene oxide blocking agent after the reaction is finished. The mass ratio of the styrene to the acrylate compound is 1: 0.8-1.2. The mass ratio of the acrylic compound to the styrene is 1: 20-30. The mass ratio of the nonylphenol polyoxyethylene ether to the styrene is 1: 25-30. The mass ratio of the persulfate to the styrene is 1: 30-35. The ratio of the aminosilane compound to ethanol is 1 g: 40-60mL. The mass ratio of the graphene oxide to the aminosilane compound is 1: 5-10. The ratio of the product B to the product A is 1 g: 20-30 mL. An INDEPENDENT CLAIM is included for an oil-based drilling fluid, which comprises 70-90 pts. wt. white oil, 0.5-1 pts. wt. main emulsifier, 1-3 pts. wt. auxiliary emulsifier, 2-10 pts. wt. reducer, 2-5 pts. wt. organic soil, 0.6-6.5 pts. wt. calcium oxide and 10-30 pts. wt. calcium chloride (CaCl) salt water with the concentration of 20-25%, 0.5-2.1 pts. wt. a wetting agent, 10-40 pts. wt. barite and 1-10 pts. wt. a new functionalized graphene oxide plugging agent.