The study is aimed to investigate stability of heavy oil from Ashalchinskoye and Mordovo-Karmalskoye fields in regards to asphaltene precipitation. Microscopic observations intensity asphaltene precipitation by adding n-heptane to the oils were used. The asphaltene stability was investigated based on the optical density versus time of asphaltene toluene/n-heptane solutions by spectrophotometry. SARA analysis, gas-liquid chromatography and FTIR spectroscopy were used to characterize the heavy oils components.
Key words: oil stability, asphaltenes, spectrophotometry, Fourier transmission infra-red spectroscopy (FTIR)
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