“…To understand clearly the relationship between the API and viscosity, an extensive literature search on heavy oil viscosity from other regions in the world was carried out. Hence, the results reported in this work are the product of the analysis of many heavy oils data collected for various heavy oil fields from the open literature. ,− 6 Kinematic viscosity vs temperature for a group of oils. Their API gravity appears in parentheses …”
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.
“…To understand clearly the relationship between the API and viscosity, an extensive literature search on heavy oil viscosity from other regions in the world was carried out. Hence, the results reported in this work are the product of the analysis of many heavy oils data collected for various heavy oil fields from the open literature. ,− 6 Kinematic viscosity vs temperature for a group of oils. Their API gravity appears in parentheses …”
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.
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