▎ 摘　　要

NOVELTY - Preparation of amphoteric two-dimensional nanosheet comprises uniformly dispersing oligomeric oxidized graphite in toluene, adding alkylamine coupling agent to react, and preparing amino-terminated graphene oxide dispersion liquid; and fully dispersing the prepared amino-terminated graphene oxide dispersion liquid in toluene-dimethyl formamide mixed solvent, adding alkyl glycidyl ether and reacting. USE - The method is for preparation of amphoteric two-dimensional nanosheet used in reservoir water injection development (claimed). ADVANTAGE - The nanosheet can form water-in-oil Pickering emulsion spontaneously at the oil-water interface, effectively stabilizes the front edge of the water drive, expands the wave and volume of water drive, has simple preparation, and is convenient for mass production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) amphoteric two-dimensional nanosheet; and (2) application of the amphoteric two-dimensional nanosheet in reservoir water injection development.