Understanding liquid accumulation in inclined pipes during ramp-down

Staff, G. (Schlumberger Norway Technology Center) | Lawrence, C. (Schlumberger Norway Technology Center) | Holm, H. (Statoil ASA, Norway)


Important properties are the pressure drop for high rates and liquid accumulation at low rates which contribute to determining the operational envelope of the field. The liquid content and pressure drop are important not only at steady operating conditions, but also during transient operations such as those caused by changes in flow rate or outlet pressure. The arrival time and the volume of the liquid surges following ramp-up may be critical factors when designing liquid-receiving and separation facilities and creating operational guidelines. Equally important is the behaviour during liquid accumulation, both correct prediction of the production rate where the liquid begins to accumulate and how long it takes for the different segments of the well/pipeline to accumulate.