New correlating parameter for the viscosity of heavy crude oils

Rashid S. Al-Maamari, Omar Houache, Sabah A. Abdul-Wahab*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


A new correlating parameter (CAPI) for heavy crude oils was developed. In this parameter, the API (American Petroleum Institute) oil gravity was corrected using a factor comprising compositional fractions (saturates, aromatics, resins, and asphltenes contents of the heavy crude oil). It was found that relating viscosity to CAPI was more representative than relating the viscosity to the API measurement alone. Using this new correlating parameter for the heavy crude oils considered in this study, two very different tendencies, defining a limiting value of 15, were observed. The viscosities of oils found under the limiting value of 15 were very sensitive to small changes in CAPI. An Omani heavy crude oil that showed higher viscosities compared to other crudes of similar API was found to be normal in terms of viscosity behavior when CAPI was used. In addition, crude oil viscosity could be predicted with more accuracy using this correlating parameter at different temperatures.

Original languageEnglish
Pages (from-to)2586-2592
Number of pages7
JournalEnergy and Fuels
Issue number6
Publication statusPublished - Nov 2006

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology


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