The invention discloses a water shutoff agent and a preparation method thereof, which belong to the technical field of oilfield exploitation
chemical preparation. According to the invention, after
graphene powder,
sodium periodate and
nitric acid solution are stirred to react,
filtration is carried out, filter residue is collected and washed, the filter residue,
sphagnum teres
herb and water are then mixed and ground, so that mixed
slurry is obtained, the mixed
slurry, glucose and
ammonium tartrate are mixed for
fermentation, the obtained
fermentation product is dried, and reacts with methallyl
alcohol and
sulfuric acid solution, the obtained product is filtered, so that a
filter cake, which is modified
graphene, is obtained, the modified
graphene then reacts with
itaconic acid, a catalyst and the like, so that a graphene-modified
polymer is obtained, the graphene-modified
polymer,
sodium fluorosilicate, an additive and the like are then mixed, so that the mixture is obtained, and finally, after the mixture is kneaded, dried and cooled, the water shutoff agent is obtained. The water shutoff agent obtained by the invention has a good water shutoff effect, and moreover, the water shutoff agent has excellent temperature-resistant and mineralization-resistant properties; after being injected into a stratum for use, the water shutoff agent cannot easily
cause blockage, and can effectively increase the oil and gas
recovery rate; and a good application prospect is realized.