▎ 摘　　要

NOVELTY - Preparing nanometer viscosity reducer comprises mixing raw materials containing nanometer template agent, reaction initiator, graft modified monomer and initiator, and obtaining the nanometer viscosity reducer. USE - The reducer is useful in viscosity reduction of thick oil (claimed). ADVANTAGE - The reducer: does not need to provide external stirring power, which can realize spontaneous osmotic dispersion and spontaneous emulsification performance of thick oil and viscosity reducer; can quickly form uniform oil-water emulsion so as to achieve excellent viscosity reducing effect. DETAILED DESCRIPTION - INDEPENDENT CLAIMs are also included for: Nanometer viscosity reducer, prepared by above method. Use of nanometer viscosity reducer in viscosity reduction of heavy oil.