Siberian Federal University

The aggregative stability of oil produced from oil-saturated reservoirs in various oilfields is studied. The results show that the composition of oil components has a substantial influence on the stability of oil. The composition of oil is investigated by the methods of extraction, liquid adsorption chromatography, and IR spectrometry, which allow to determine the content of resins, asphaltenes, and saturated and aromatic hydrocarbons. The resistance of oil to asphaltene precipitation is studied by electron spectrophotometry. It is shown that stability increases in oil samples containing a higher amount of aromatic structures and resins compared to asphaltenes. The obtained patterns of changes in the resistance of the oils under study to asphaltene precipitation may also hold true for oils produced in other oilfields. These oils may differ in composition and properties due to the peculiarities of their genesis