Abstract: Pipeline wall with resin coating can significantly reduce the resistance of its delivery. Epoxy coatings with various surface properties were prepared by adding different amounts of low surface energy filler. The drag reduction effect of epoxy varnish and epoxy color paints was evaluated in a circulation pipeline testing equipment in the laboratory using three oil samples having various viscosities. Results show that all the prepared coatings exhibit drag reduction function on the samples tested, and coatings containing low surface energy filler have better drag reduction effect, in which epoxy color paint with 3% PTFE shows the maximum drag reduction rate of 23.1% at a Reynolds number of 3 475. However, the drag reduction effect of epoxy coatings on oil samples is related to the oil viscosity and the surface property of coating, with the increase of oil viscosity and the decrease of coating surface tension, the drag reduction rate of coating increases.

Key words: epoxy coatings, drag reduction, petroleum product, low surface energy