▎ 摘　　要

NOVELTY - Acrylamide- alpha -olefin copolymer (I) is new. USE - (I) is useful in preparing drag reducing agent (claimed). ADVANTAGE - (I): reduces the stereoregularity and crystallinity of the drag reducing agent molecule; enhances the product stability and their solubility in hydrocarbon media including crude oil to facilitate their rapid dispersion and effect when used; and can also play buffering role, enhance the flexibility and shear resistance of the drag reducer molecule, and make the drag reduction effect of the product significantly lasting. DETAILED DESCRIPTION - Acrylamide- alpha -olefin copolymer of formula (I) is new. m, k = 1000-10000; n = 200-2000; R1 = 30-200C unsubstituted alkyl, cycloalkyl substituted alkyl or aryl substituted alkyl group; R2 = 2-30C alkyl; and R3 = 2-30C hydrocarbon. INDEPENDENT CLAIMS are also included for: (1) preparation of (I); (2) drag reducing agent, comprising 90-100 wt.% (I) and 0-10 wt.% nano additives; and (3) preparing drag reducing agent, comprising taking (I) and nano auxiliary agent, freezing and pulverizing (I) to obtain pulverized product, mixing the pulverized product with nano auxiliary agent, solvent and dispersant to obtain drag reducing agent suspension, where the mass ratio between drag reducing agent component, solvent and dispersant is 20-50:50-80:0.1-1, the solvent is 6-32C alcohol mixture, the dispersant is octylphenol polyoxyethylene ether OP-10 and/or nonylphenol polyoxyethylene ether.