Abstract⎯The structural and rheological properties of resin-free model petroleum mixtures (MPM) with an asphaltene content of 0 to 6 wt % and the same mixtures with added 3.85 wt % petroleum resins have been investigated. The composition of the mixtures simulates the amount of the main hydrocarbon-group components and distillate fractions in light paraffin-base oils ( = 747.7-789.1 kg/m 3 ). Temperature-dynamic viscosity relationships for cooling the MPM have been obtained, most of which displayed abnormalities in the temperature range of ~40-60°C. Calculations of the viscous-flow activation energy (E μ ) have shown that there are abrupt changes in E μ in this abnormality region, which are an indication of structuring processes. By means of Fourier-transform laser diffractomery of MPM solutions in kerosene, it has been found that the particle size of the petroleum mixtures is qualitatively related to the revealed abrupt changes in E μ . It has been shown that these abnormalities correspond to the formation of paraffin-asphaltene associates and their existence is determined by the critical concentration of resins and asphaltenes in the mixtures.

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Development results of an oil field reagent TNCHS-15.0 are presented, this is a solution of non-ionic surfactants composition, that can prevent asphaltene-resin-paraffin precipitation of oil and lower viscosity of oil dispersed systems during transport via pipeline. Effectiveness of developed reagent is proved by the results of laboratory researches in LLC «RN-UfaNIPIneft» with recommendation to conduct field tests on Ust-Tegusskoe field of LLC «RN-Uvatneftegaz». Viscosity reduction at temperatures, typical for oil transportation, is 55% and effectiveness of asphaltene-resin-paraffin precipitation inhibiting is 62%.

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There were studied the influence of composition of foreign marine fuels on its quality indexes which estimate the combustibility and combustion efficiency of this fuels in the marine reciprocators. It was found that using the high-density fuels in the engines of marine technique, which specified for exploitation on the automotive diesel fuels, can be the cause of decreasing the combustion efficiency, increasing of smokiness of exhaust gases and facility of technique’s failure. Using of methyl esters of fatty acids in the marine fuel’s composition in concentrations until 1 mass percent influents positively on combustibility and combustion efficiency. This result in the aggregate of results of other researches of influence these concentrations of FAME on the emulsification and lubricity of marine fuels follows to possibility of its short-time using marine technique. Experimentally proved the necessity of offered calculating method which estimates the combustion efficiency and combustibility of marine fuels. It was found that this method is more adequate and sensitive for estimation of those properties of heavy marine diesel fuels and petroleum diesel fuels with the FAME contention then the method of estimation of Cetane Index (GOST 27768).