Testing of anti-turbulent additives of Russian and foreign manufacture

UDK: 621.6:622.69
DOI: 10.24887/0028-2448-2023-6-88-91
Key words: oil, turbulence, temperature, viscosity, polymer
Authors: V.N. Manzhai (Institute of Petroleum Chemistry, Siberian Branch of the RAS, RF, Tomsk)

IIn the last three decades, polymer-based anti-turbulent additives have been widely used in the Russian Federation in order to reduce hydrodynamic resistance when pumping oil and oil products through main pipelines and thus to reduce energy costs. The hydrodynamic properties of presently available commercial additives of Russian and foreign manufacture were experimentally studied in a laboratory environment and then a comparison was made of their anti-turbulent properties. Anti-turbulent properties of additives were tested in two hydrocarbon solvents (gasoline and oil) using a turbulent rheometer. It was determined that the transition from one solvent to another is accompanied by a change in the efficiency of additives depending on the physicochemical nature of the solvents and their rheological properties. It has been found out that the optimal concentration, at which the maximum effect of hydrodynamic drag reduction was achieved, was one and a half times higher in oil than in gasoline. The obtained pattern was a consequence of the presence of heavy components (resins, asphaltenes, and high molecular weight paraffins) in oil. High molecular weight polymers were partially adsorbed on these components and, therefore, the content of the hydrodynamically active component in solution decreased. Thus, the optimal concentrations of the polymer in oil are higher than in gasoline, hence more polymer is required the pipeline transportation of oil requires more polymer than the pumping of light oil products. It has been found out that oil-soluble additives from Russian manufacturers are not inferior in their performance to imported analogues. All additives are based on natural hydrocarbons, so they are fully compatible with oil and do not adversely affect the pipeline network and subsequent oil refining.

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