▎ 摘　　要

NOVELTY - Clean, environmentally friendly, and high-temperature resistant nano fracturing fluid comprises 5-8 pts. wt. guanidine gum, 1-3 pts. wt. modified lignosulfonate, 1-2 pts. wt. organic boron crosslinking agent, 0.5-1 pts. wt. nano material, 2-3 pts. wt. clay stabilizer, 2-3 pts. wt. auxiliary discharging agent, 0.3-0.5 pts. wt. gel breaker, 2-3 pts. wt. phase change filler, and 100 pts. wt. water. USE - Used as clean, environmentally friendly, and high-temperature resistant nano fracturing fluid. ADVANTAGE - The fluid has excellent sand carrying performance under high temperature and high shear and improves the temperature resistance and shearing resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the nano fracturing fluid, comprising (o) dividing the water into two parts, adding guar gum into one part of the water and stirring to make a guar gum aqueous solution, and adding modified lignosulfonate to the other part of water to prepare a uniformly dispersed nano-dispersion; (p) adding nano-dispersed liquid to the guar gum aqueous solution under stirring conditions, and stirring to reach a uniform mixture; and (q) Under stirring conditions, sequentially adding nanomaterials, clay stabilizers, auxiliary discharging agent, gel breakers and phase change fillers into the mixed liquid, stirring uniformly to prepare a base fluid, and adding organoboron cross-linking agent into the base fluid and mixing uniformly.