▎ 摘　　要

NOVELTY - Forming barrier involves injecting a polymer-sand nanocomposite into one or more water producing fractures in the subterranean formation, the polymer-sand nanocomposite comprising sand with a surface polymerization mixed with a polymer hydrogel, where the surface polymerization comprises non-functionalized graphene and a co-polymer comprising polystyrene, poly(methyl methacrylate), polyacyrlonitrile, polyvinyl alcohol, polyethylene terephthalate, polybutylene terephthalate, hydrolyzed polyacrylamide, polycarbonate, polyethylene, polyurethane, polypropylene, and acrylonitrile butadiene styrene. USE - Method of forming barrier that is used for eliminating or reducing unwanted production of water in subterranean formation (claimed). ADVANTAGE - The method has cost-effective. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a subterranean. Hydrocarbon bearing zone (10) Water bearing zone (20) Fracture (30) Wellbore (40)