▎ 摘　　要

NOVELTY - Thickening agent comprises 1-2 wt.% nanometer silicon dioxide, 0.5-1 wt.% graphene, 1-2 wt.% fluorocarbon non-ionic surfactant, 2-4 wt.% cocamide betaine, 1-2 wt.% olefin sulfonate, and remaining amount of distilled water. USE - Used as thickening agent. ADVANTAGE - The thickening agent: can replace guar gum in fracturing fluid; can solve the high viscosity of fracturing fluid; has the function of promoting oil recovery by imbibition and solves the problem of flocculent precipitation formed after gel breaking. DETAILED DESCRIPTION - INDEPENDENT CLAIMs are also included for: (1) Preparing thickening agent comprising (i) adding distilled water, fluorocarbon non-ionic surfactant, cocamide betaine, olefin sulfonate for stirring and mixing to obtain the first mixed solution, (ii) then adding nano silicon dioxide and graphene to the first mixed solution to obtain the second mixed solution, continuously stirring and oscillating the second mixed solution to finish the preparation. Fracturing fluid comprising 1.0 wt.% potassium chloride, 0.1-3 wt.% thickening agent, and the remaining amount of liquid water. (2) Preparing fracturing fluid comprising (a) adding liquid water and potassium chloride into a constant speed stirrer, stirring to completely dissolve, and (b) adding thickening agent into the constant-speed stirrer, and stirring. (3) Adhesive breaking of fracturing fluid comprising adding 3-5 wt.% kerosene or light oil into the fracturing fluid, stirring uniformly, allowing to stand for 2-4 hours at 50-70degreesC, and finishing the gel breaking process. (4) Use of fracturing fluid comprising (p) taking clean water into the container, adding the thickening agent, covering and then reversing, quickly shaking after 30 seconds, determining the best thickening agent dosage ratio when liquid is capable of forming the tongue-shaped fracturing fluid time is the fracturing fluid cross-linking time, (q) determining the optimal crosslinking ratio according to construction displacement and small sample test, calculating the proportional pump displacement, selecting the proportional pump with proper measuring range, (r) injecting front isolating liquid, preventing the fracturing fluid from premature contact light oil to break the gel, (s) injecting the fracturing fluid, modifying the oil gas layer to form a complex seam net, stopping the well after stopping the pump, (t) opening well back row production, breaking the incomplete well re-injecting light oil.