▎ 摘　　要

NOVELTY - Polymer composite hydrogel comprises a polymer composite, water, an organic crosslinker, and a salt, where the polymer composite comprises a nanosheet filler dispersed throughout a polymerized polyacrylamide. The nanosheet filler comprises non-functionalized graphene. The weight ratio of the nanosheet filler to the polymerized polyacrylamide is 1:99-1:9. The polymer composite hydrogel comprises 0.5-6 wt.% of the polymer composite. The polymer composite hydrogel comprises 0.25-5 wt.% of the salt, where the salt comprises a monovalent salt. USE - Polymer composite hydrogel for water shutoff. Adv: --- ADVANTAGE - The polymer composite hydrogel for eliminates or reduces water production in a hydrocarbon wellbore. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the subterranean formation showing fractures connecting a wellbore and a water bearing zone. Hydrocarbon bearing zone 10 (10) Water bearing zone (20)