Q: When should I use multiphase flow fluid properties in PC-PUMP instead of single-phase flow?

A: Whenever you have a measurable gas rate in the well. Regardless of the API gravity of the crude oil, its viscosity will decrease due to the gas in solution, and its density will decrease, particularly if some gas comes out of solution in the tubing. Both of these mean that in most cases the pressure losses will decrease in most cases if multiphase flow is used. Note that it is particularly important for oils heavier than 15-20°API to enter the dead oil viscosity in the advanced viscosity window.

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