▎ 摘　　要

NOVELTY - High-strength hole sealing agent comprises 2-5 pts. wt. graphene, 4-8 pts. wt. basalt short fiber, 50-70 pts. wt. silicate cement, 20-25 pts. wt. gypsum, 10-15 pts. wt. fly ash, 2-5 pts. wt. expansion agent and 2-5 pts. wt. additive. USE - The high-strength hole sealing agent is useful for coal mine gas extraction borehole (claimed). ADVANTAGE - The sealing agent has good expansion performance, expansion rate can reach 50%, which can effectively seal the hole, effectively reduce the drilling leakage channel, prolong the gas extraction period and improve the gas extraction concentration.