▎ 摘　　要

NOVELTY - Preparing modified nano-graphene slurry anti-slump agent comprises (a) carrying out the first contact between the nano-graphene and the mixed acid to obtain a mixed solution, (b) adding potassium chlorate drop wise to the mixed solution for modification treatment to obtain modified nano-graphene under ice bath conditions and (3) contacting the modified nano-graphene with water for a second time to obtain a modified nano-graphene slurry. USE - The modified nano-graphene slurry anti-slump agent is useful in micro-fracture pores developed in basalt (claimed). ADVANTAGE - The drilling fluid can fully seal the micro-nano pores and fractures in the basalt well wall. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a modified nano-graphene slurry anti-slump agent prepared by the above method; and (2) a aqueous-based drilling fluid comprising modified nano-graphene slurry anti-slump agent, micron plugging agent and weighting agent.