...Flow pattern transition model for gas-highly viscous fluids in horizontal pipelines A Brito, R Cabello, J Marquez PDVSA Intevep, Venezuela J Trujillo GALP Energy, Portugal N Guzmán Lone Star College, USA ABSTRACT The increasing world oil demand has led to develop the large heavy and extra heavy oil...

... ABSTRACT Slug flow formed in a connecting upstream horizontal pipeline is propagated in a 189mm diameter riser at conditions where it is absent in the same riser when the gas (nitrogen) and liquid (naphtha) phases are introduced at the riser base. However, at low liquid flow rates the upstream...