Understanding flowline-riser system operability ///

In many oil and gas developments that incorporate multiphase flowlines, system instability is a major flow assurance concern. Excessive demands that large changes in oil and gas flowrates place on processing facilities are a major source of such instability. Multiphase instability can influence the selection of flowline route, flowline diameter and the requirement for gas lift for a subsea oil development concept. Consequently, they can potentially have a significant negative impact on the net present value of a system. Therefore, they should be addressed as early in the design phase as possible, and in sufficient detail to ensure a robust concept passes through to the later design phases. Multiphase surges come in three forms: hydrodynamic slugs, operationally induced surges and riser-induced slugs. Hydrodynamic surges can usually be accommodated in a modestly sized slug catcher and are of less concern, which is fortunate, because accurate prediction of this phenomenon remains problematic.

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