▎ 摘　　要

NOVELTY - Selective water blocking agent preparation involves mixing graphene oxide with N,N-dimethylformamide in a mass ratio of 1:200-1:400 and ultrasonically dispersing to obtain a graphene oxide dispersion, and then mixing with organic amine and adding dicyclohexylcarbimide with stirring. The supernatant is removed to obtain pre-modified oxidation graphene mixture, which is filtered, washed, and dried to obtain pre-modified graphene oxide. The obtained pre-modified graphene oxide is mixed with an organic solvent in a mass ratio of 1:20-1:30, and then mixed with the pre-modified graphene oxide and water with stirring to obtain modified graphene oxide. The acrylamide and methyl silicic acid are mixed in a mass ratio of 1.8:1.0-2.0:1.0, and then added to 2-acrylamide-2-methylpropanesulfonic acid with stirring to obtain pretreatment mixture. USE - Method for preparing selective water blocking agent. ADVANTAGE - The method prepares the selective water blocking agent in a simple, cost-effective and eco-friendly manner with excellent selective permeability and water blocking performance. DETAILED DESCRIPTION - The obtained pretreatment mixture is mixed with silane coupling agent in a mass ratio of 80:1-100:1, and then added to modified graphene oxide, catalyst and epoxy soybean oil with stirring to prepare a mixture. The prepared mixture is pumped, filtered, washed, dried, and pulverized to obtain the selective water blocking agent.