Oil production is inevitably accompanied by the formation of oil-water emulsions, and the main task in the oil field treatment is oil-water emulsions separation. Oil emulsions significantly affect the technological processes of separation, preliminary dehydration, demulsification and lead to the accumulation of an intermediate emulsion layer. This paper presents the research of oils of four fields of the Irkutsk Oil Company: Yaraktinskoye, Ichedinskoye, Machchobinskoye, and Bolshetirskoye. The physical and chemical properties of these are given. Based on the results of the IR spectra, the spectral coefficients of oil were calculated as the ratio of the optical densities of the corresponding absorption bands of the IR spectra; the group chemical composition was analyzed and the types of oil were determined. The influence of natural emulsifiers and mechanical impurities on the stability of oil emulsions has been investigated. High concentration of mineral salts in the produced water has a significant effect on the stabilization of oil emulsions in the East Siberian petroleum province; the produced waters have low pH values. The article also indicates the composition, physical and chemical characteristics of formation waters. The microphotographs of microscopic examination of the emulsion are presented. With the help of these microphotographs it was found that the composition of the emulsion includes a crystalline phase and the size of crystals is up to 300μ. The stability of dispersed systems was evaluated using the Lumifuge 116 analyzer (L.U.M. GmbH, Germany). Based on the results of the studies, the dependence of the emulsion phase boundary position on the time was found; it also made it possible to observe the kinetics of the process in real time mode. The studies carried out in Lumifuge device are the beginning of a creation of library of passing through profiles of dispersed systems for oilfield treatment use, which will make it possible to solve the problems associated with field development quickly and efficiently.
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