Abstract
In this work, various oils were studied, for which the group chemical composition, viscosity-temperature and structural-mechanical properties were determined. It has been established that these oils are paraffinic, resinous and highly resinous, as well as low paraffinic, highly resinous. For these crude oils, isothermal flow curves of the forward and reverse strokes were obtainedat temperatures of 10, 0 and -10°C. The values of the internal energy of destruction of the supramolecular structure (ΔW)of oils were calculated. It has been established that for all crude oils with decreasing temperature, an increase in ΔW is observed.This is due to the formation of a spatial crystal lattice of paraffinic hydrocarbons in the volume of crude oil. It is shown that with an increase in the value of the total content of solid paraffinic hydrocarbons and asphaltenes (P+A) and a decreasein the proportion of resins (S), the degree of structuring of the crude oil system increases. It has been established that at low temperatures for the studied crude oils, the value of the index (Р+А)/ S, equal to 0,4, is the threshold value abovewhich the crude oil exhibits thixotropic properties due to the structuring of the system.
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