Slug flow data are collected from two crude oil multiphase flow lines. The dimensions are 8 and 14 inches and the lengths are about 14 km. For some flow conditions hydrodynamic slugs grow and generate pressure fluctuations in the flow lines and risers. The analysis concludes that long hydrodynamic slugs are generated in upward inclined sections, where transition from stratified to slug flow occurs, referred to a flow map, and grow large in the downstream stratified section. The field data are attempted to be reproduced by means of dynamic simulations. The discrepancies between the data and the simulations are discussed. A methodology using flow pattern maps in combination with field data are presented for prediction of the onset of instabilities caused by hydrodynamic slugging.

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