▎ 摘　　要

NOVELTY - Nano drag reducer is claimed. The reducer is prepared by connecting nano-material and polymer A by coupling agent to obtain final product; the nano drag reducer has network structure, the polymer A includes structural unit i.e. propionaldehyde compound (I), and the nano-material includes attapulgite, graphene oxide, and/or montmorillonite. USE - The nano drag reducer is useful in development of petroleum (claimed). ADVANTAGE - The method: modifies the surface structure of nano-materials to regulate spacing of nano-particles, and thus the nano-materials can be uniformly distributed in the fracturing fluid without causing or minimizing the agglomeration phenomenon, and can completely reflect the unique nano effect of nano-materials. DETAILED DESCRIPTION - Nano drag reducer is claimed. The reducer is prepared by connecting nano-material and polymer A by coupling agent to obtain final product; the nano drag reducer has network structure, the polymer A includes structural unit i.e. propionaldehyde compound of formula (I), and the nano-material includes attapulgite, graphene oxide, and/or montmorillonite. An INDEPENDENT CLAIM is also included for preparing nano drag reducer, comprising reacting mixture I containing nano-materials, acrylic compounds, acrylamide compounds, sodium 2-acrylamido-2-methylpropanesulfonate, coupling agent and initiator to obtain final product.