... accumulation. At low flow rates, liquid surge wave instabilities in the flowlines occur. In the present paper, it is shown that the tuned flow model capture these surge waves. The model predicts that the water surge comes from the riser, while the condensate surge comes from the flowline. Details...

... of applications. Multiphase flows are characterized by a broad range of scales, from the dispersed droplets at the micro scale up to macro scale free surface flows. liquid holdup fraction slug flow production control riser void fraction fraction upstream oil & gas interface hybrid model...

... by some type of empirical equation. flow system multiphase orifice equation flow rate riser production monitoring upstream oil & gas production control liquid pressure drop vertical pipe reservoir surveillance bhr group 18 vertical section orifice experimental data multiphase...

... ABSTRACT Field data are presented for two parallel risers connected to the same inlet. The data show that the multiphase flow is split equally over the two risers at high flow rates; however, below a critical flow rate the system diverges: the flow passes preferentially through one riser...

... Three-dimensional computational fluid dynamics (CFD) simulations were carried out with ANSYS Fluent 15.0 for the splitting of two-phase, gas-liquid flow from a horizontal flowline to two vertical risers. This piping configuration is representative of what is being envisioned for transport of gas...

... techniques, which illustrated good agreement for topsides minimum temperature and liquid carry-over predictions. High-level validation was investigated via computational fluid dynamics CFD, empirical and field data. composition riser liquid column scenario method 1 wgc system compositional...

... the gas compression facilities. These fluctuations are caused by the fluid composition, geometrical layout and operating conditions of the production system. Especially with flowline/riser systems, the riser may have a large impact on the amplitude of the production fluctuations. With the current trends...

... ABSTRACT The severe slugging flow instability in flowline-riser systems is an upstream compressibility problem, where trapped gas upstream the riser base can be compressed and eventually cause blow out of the accumulated liquid in the riser. For the case of a very long riser, flow...

... mathematical model to simulate the slugging behaviour. However, it is also challenging to model severe slugging in risers with diverse geometries. A one-dimensional, isothermal and quasi-equilibrium model is developed based on the severe slugging mechanism and verified with experiment data. Riser geometric...

... ABSTRACT We have carried out laboratory experiments for the phase split of a gas-liquid flow from a single flowline to a dual riser. The facility used for the experiments is the air-water loop at the Shell Technology Centre in Amsterdam. The 2" diameter loop consists of a 100 m long flowline...

... ABSTRACT Three slug types were found in the new lab experiments carried out in a 2" flowline-riser system with 477 litre volume operating at ambient pressure: severe slugging of type I (which has a liquid slug length larger than the riser height), severe slugging of type II (having a liquid...

.... The method may potentially reduce or eliminate terrain-induced severe slugging in subsea risers, allow higher production rates without choking and provide a potential solution to deepwater fields which are starting to experience severe slugging. The commercial dynamic multiphase pipeline simulator OLGA®...

... ABSTRACT Analysis of field data indicates that slugs generated in a near horizontal flowline can develop a long high void zone in front of a low void zone as the slugs move upwards in a high riser. The two void zones are separated by a relatively sharp void front. Reanalysis of Sintef Two...

... cuts. The beneficial role of gas lift added at the manifold closest to the riser base is demonstrated for some flowrates. An adverse flow stability effect of gas lift is noted for other flowing conditions. This paper illustrates a methodology for analysing and presenting flow stability results...

... 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...

... ABSTRACT Control systems that prevent the development of riser slugging in pipeline-riser systems have in recent years been introduced on several offshore processing facilities. These control systems are based on active use of the topside choke valve to keep a pressure measured somewhere...

... ABSTRACT 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...