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The results of experimental studies into the viscosity of heavy fuel oils mixed with a liquid additive Diproksamin-157 and a solid additive based on dehydrated carbonate water treatment sludge with a concentration of 0.5 wt. % are presented. Experimentally it has been found out that the viscosity characteristics of fuel oil at the addition of Diproksamin-157 showed nearly 20 % improvement, and at addition the carbonate slurry –7 – 10% improvement. In the case of water-fuel emulsion comprising carbon nanotubes the improvement of the rheology oil characteristics to 10 – 25% by introduction of carbon nanotubes water suspension containing 0.82 wt. % into fuel has been observed. However this result at the moment has only basic value as it is not economically reasonable to use carbon nanotubes in such concentration.

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The experimental investigations of the dynamic viscosity of the M100 brand heavy fuel oil with addition of nanostructured additives at temperatures of 65 °C and 75 °C have been presented. The study of the dynamic viscosity conducted for M100 fuel oil sample with the addition of a suspension of carbon nanotubes dispersed in diproksamin (concentration of 0.0125 wt.% CNT + 0.5 wt.% diproksamin) showed its decrease in almost the entire range of shear rates. The reduction in viscosity was observed even at low shear rates, which indicates the absence of extensive spatial structure in the oil heterogeneous system. Thus, the additive based on carbon nanotubes dispersed in diproksamin, improves the rheological properties of oil, reducing its viscosity to 12-15%. Therefore the energy consumption for fuel oil heating and pumping through pipelines can be reduced.