RESEARCH OF RHEOLOGICAL AND LOW-TEMPERATURE PROPERTIES OF SOLVENTS WITH THE SOLID CRUDE OIL COMPONENTS
The results of rheological and low-temperature properties of model solvents research are presented. Solvents consist of: n-tricosane, octadecane, asphaltenes of Aganskoe oilfield, n-heptane, oil fraction 230-400˚С. Cooling curves of that solvents have been studied in temperature space 40-(-20˚С). Viscosity-temperature curves have been studied in viscosity space 0,3-1031 mPa•s. Depressors and asphaltenes have been proved to have similar effect on processes of solid crude oil hydrocarbons crystallization. This effect occurs as a significant increasing temperature space of that process, that moves the end of them to the low temperatures area. Asphaltenes have been discovered to make positive or negative influence on structure-rheological properties of crude oil dispersive systems, depending on their concentration. There has been found the effect of rapidly increasing temperature of model solvents immobilization in case of asphaltenes concentration increasing over 5 mass percents. This effect is not connected with solid crude oil hydrocarbons immobilization in asphaltene flocks because it is not followed by related phase transfers displacement to the higher temperatures area.