▎ 摘　　要

NOVELTY - Preparing thick oil viscosity reducer involves (i) dissolving the polyvinyl pyrrolidone in the deionized water, adding graphene oxide, ultrasonically processing for 15-30 minutes to obtain the product, where the particle size of the graphene oxide is 100-1000 nm; (ii) adding modifier-1, modifier -2 and modifier -3 into the organic solvent, stirring and dissolving to obtain the product; (iii) adding the graphene oxide dispersion and modifier solution into a three-necked flask equipped with a stirrer, condenser and thermometer, adjusting the pH to 3-8, controlling the stirring speed at 300-500 revolutions/minute, reacting at 30-80℃ for 6-18 hours, filtering and drying to obtain the product, where the mass ratio of the modified agent solution and graphene oxide dispersion liquid is 1:(0.1-3.5); (iv) dissolving in the oily solvent, adding modified graphene oxide, and ultrasonically processing for 15- 30 minutes to obtain the product. USE - The method is useful for preparing thick oil viscosity reducer. ADVANTAGE - The modified graphene oxide is suitable for kerosene, solvent oil and other solvents for thick oil with different viscosity, and can obviously improve the thick oil viscosity reducing effect of the system. DETAILED DESCRIPTION - Preparing thick oil viscosity reducer involves (i) dissolving the polyvinyl pyrrolidone in the deionized water, adding graphene oxide, ultrasonically processing for 15-30 minutes to obtain the product, where the particle size of the graphene oxide is 100-1000 nm, the molecular weight of the polyvinyl pyrrolidone is 20000-70000 g/mol, and the mass ratio of graphene oxide, polyvinyl pyrrolidone and deionized water is 1:(0.01-1): (50-300); (ii) adding modifier-1, modifier -2 and modifier -3 into the organic solvent, stirring and dissolving to obtain the product, where mass ratio of modifier-1, modifier-2, modifier -3 and organic solvent is 1:(0.05-0.7): (0.1-1):(10-100), the organic solvent is acetone, methanol, ethanol, dioxane, formamide or dimethylformamide, the modifier-1 is octylamine, decyl amine, lauryl amine, tetradecyl amine, hexadecyl amine, octadecylamine, dioctylamine, or didecyl amine, the modifier-2 is ethanolamine, diethanolamine, npropanolamine, isopropanolamine, diisopropanolamine or diglycolamine and the modifier-3 is m is 2-10; (iii) adding the graphene oxide dispersion and modifier solution into a three-necked flask equipped with a stirrer, condenser and thermometer, adjusting the pH to 3-8, controlling the stirring speed at 300-500 revolutions/minute, reacting at 30-80℃ for 6-18 hours, filtering and drying to obtain the product, where the mass ratio of the modified agent solution and graphene oxide dispersion liquid is 1:(0.1-3.5); (iv) dissolving in the oily solvent, adding modified graphene oxide, and ultrasonically processing for 15- 30 minutes to obtain the product, where the ratio of modified graphene oxide, the surfactant and the oily solvent is 1:(0.05-1):(100-800), the surfactant is Span 85 (Sorbitan trioleate), Span 80 (Sorbitan monooleate), Span 65 (Sorbitan tristearate) and Span 60 (Sorbitan monostearate) and the oily solvent is xylene, diesel oil, kerosene, white oil or solvent oil.