Method for reducing viscosity of thick oil by blending thin oil based on oil-based nano fluid

The invention discloses a method for reducing the viscosity of thick oil by blending thin oil based on oil-based nano fluid. The method comprises the following steps: magnetizing molybdenum disulfide to obtain magnetic molybdenum disulfide; dispersing the obtained magnetic molybdenum disulfide in thin oil, which is selected from one of diesel oil, bio-diesel and vegetable oil, to obtain magnetic molybdenum disulfide/thin oil dispersion liquid; and mixing the magnetic molybdenum disulfide/thin oil dispersion liquid into thick oil for viscosity reduction treatment. The high-thermal-conductivity magnetic nano molybdenum disulfide is introduced into the thick oil thin oil blending viscosity reduction process, heat of thin oil can be transferred into thick oil more evenly and more efficiently, the heat utilization rate is increased, meanwhile, the thick oil viscosity reduction rate is increased, and the thick oil recovery cost is reduced; and the high-thermal-conductivity nano molybdenum disulfide is magnetized, t