Use of the Technique of Spectrophotometry to Study the Stability of Crude Oil from the Usinsk Field
T. V. PETRENKO1, D. I. CHUIKINA1, L. D. STAKHINA1,2
1Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
2Tomsk State University, Tomsk, Russia
Keywords: тяжелая нефть, состав, смолы, асфальтены, устойчивость, спектральные коэффициенты, heavy oil, composition, resins, asphaltenes, stability, spectral coefficients
Abstract
The effect of heavy high molecular mass components of crude oil (asphaltenes, resins, and aromatic hydrocarbons) on its aggregative stability was studied on the example of heavy oils from the Usinsk field. The componential composition of oil samples was determined by precipitation and chromatography methods. Different spectral characteristics in the visible region that allow operatively comparing the resistance of crude oil against precipitation of asphaltenes were determined by the method of electron spectroscopy. For this purpose, dynamic curves of a change in the optical density were removed in solvent/precipitator (toluene/hexane) system and light absorption (C500) and colour (Cc) coefficients were computed. The stability of crude oil was determined by not only the ratio of resin and asphaltene components, as demonstrated. Oil aggregative stability versus the degree of condensation and a network of aromatic compounds was revealed using colour coefficient.
DOI: 10.15372/CSD20180107
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