▎ 摘　　要

NOVELTY - Hydrogel plugging agent comprises 40-50 pts. wt. clay minerals, 10-20 pts. wt. aluminum borate whisker composite modified bentonite, 10-20 pts. wt. modified nano-graphene, 2-5 pts. wt. lubricant, 2-5 pts. wt. tackifier, 2-6 pts. wt. coupling agent and 55-75 pts. wt. deionized water. USE - The hydrogel plugging agent is useful in aqueous drilling fluid (claimed). ADVANTAGE - The hydrogel plugging agent has excellent plugging effect and stable plugging effect under high temperature and high pressure performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: Preparing hydrogel plugging agent, comprising (i) heating the lubricant to 210-220℃, adding tackifier into the lubricant, sending it into the clay mineral, adding deionized water and stirring; and (ii) adding aluminum borate whisker composite modified bentonite, modified nano-graphene, and coupling agent and stirring uniformly; and Aqueous drilling fluid comprises the hydrogel plugging agent.