Abstract The operation of electric submersible pumping (ESP) systems in heavy‑oil fields faces highly severe conditions, characterized by elevated viscosity, temperatures above 250 °F, and the presence of free gas. In this context, the rotary gas separator (RGS) has proven to be a robust technological alternative to improve gas‑handling efficiency and ESP reliability. This work expands on a previously documented case study in the Chichimene Field, where one of the main operational challenges has