▎ 摘　　要

NOVELTY - Treatment of wellbore involves deploying a application packer (A) into the wellbore to a lower target depth below the water zone, discharging hydrogel from the application packer (A) through the sand screen into an annulus between the sand screen and the geological formation to form a lower hydrogel packer in the annulus at the lower target depth, deploying a application packer (B) into the wellbore to an upper target depth above the water zone, and discharging hydrogel from the application packer (B) through the sand screen into the annulus to form an upper hydrogel packer in the annulus at the upper target depth. The hydrogel comprises a cationic polyacrylamide (PAM) and graphene oxide (GO). The wellbore comprises a sand screen. USE - Treatment of wellbore in geological formation for isolation of water zone (claimed) for producing hydrocarbon such as crude oil and natural gas. ADVANTAGE - The method enables effective treatment of wellbore containing hydrogel having mechanical property, thermal property, and self healing ability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) isolation of water zone in wellbore in geological formation, which involves (802) deploying the application packer into the wellbore to below the water zone, and injecting hydrogel from the application packer through the sand screen into an annulus between the sand screen and the geological formation to form a lower hydrogel packer in the annulus, in which the hydrogel comprising a cationic polyacrylamide (PAM), graphene oxide (GO) nanosheets, and an adhesion promoter; and (2) wellbore, which consists of the sand screen, the lower hydrogel packer below the water zone in the annulus between the sand screen and the geological formation to facilitate isolation of the water zone, and the upper hydrogel packer above the water zone in the annulus to facilitate isolation of the water zone, in which the lower hydrogel packer and the upper hydrogel packer each comprising a self-healing hydrogel comprising a cationic polyacrylamide (PAM) and a crosslinker comprising graphene oxide (GO) to promote self-healing of the self-healing hydrogel, and the self-healing hydrogel comprising water. DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of isolation of water zone in wellbore containing the sand screen. Deploying application packer having hydrogel into wellbore (802) Discharging hydrogel from application packer through sand screen to form lower hydrogel packer (804) Discharging hydrogel from application packer through sand screen to form upper hydrogel packer (806) Retrieving application packer from wellbore (808) Treating wellbore to isolate water zone (810)