An improved mathematical model considering the nonequilibrium and the non-isothermal effects involved during rapid multiphase flow in wells and pipelines is presented. The extent of the non-equilibrium effect on deviation from the equilibrium model predictions is delineated under prevailing flow rates, fluid saturations, and temperatures. Applications for three-phase (oil/water/gas) systems are presented. The model presented here can be coupled with reservoir simulation for accurate representation of the well-fluid hydraulics and simulation of flow conditions in pipelines under nonequilibrium and non-isothermal flow conditions.

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