Determination of SARA fractions of crude oils by NMR technique

Kok M. V., Varfolomeev M. A., Nurgaliev D. K.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING, vol.179, pp.1-6, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 179
  • Publication Date: 2019
  • Doi Number: 10.1016/j.petrol.2019.04.026
  • Journal Name: JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1-6
  • Keywords: Crude oil, SARA fractions, Aromaticity, C NMR, H NMR, PHYSICOCHEMICAL PROPERTIES, SPECTROSCOPY, ASPHALTENES, SPECTRA, H-1
  • Middle East Technical University Affiliated: Yes

Abstract

In this research, four different crude oils from Tatarstan oil fields with wide range of API gravities (from 16.6 to 32.5 degrees API) were used for hydrogen and carbon nuclear magnetic resonance spectroscopy (H NMR and C NMR) determinations. The hydrogen and carbon aromaticity factors were calculated by using the results of H NMR and C NMR spectroscopy results. The results show that the aromaticity factors were high for heavy crude oils. For predicting SARA fractions, the correlations were developed as a function of aromaticity factors. The developed correlations showed high accuracy for predicting SARA fractions for four crude oils.