Q: Why does the program give me a warning if I try to specify heavy oil (<15°API)?

A: This occurs only in multiphase flow. Many of the correlations that are used to determine fluid properties (such as dead and live oil viscosity, solution gas ratio, bubble point, etc.) were not designed to work in heavy oil. Those correlations which were intended for use in heavy oil may only be applicable to oils from certain regions. With heavy oil, there is much more regional variation in properties (for oils with the same API gravity) than there is with medium or light oil. PC-PUMP will allow to continue your calculation—this is just a warning message and not an error. We do recommend, however, that you enter your oil’s actual dead oil viscosity at several temperatures in the Advanced Viscosity window. This will remove one correlation and should significantly improve the accuracy of the results.

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