In slightly upwardly inclined pipes with low liquid flow rates there exists a region were the holdup increases almost like a discontinuity with decreasing gas flow. To predict this transition region accurately is of great importance for design and operation of gascondensate pipelines. The multiphase flow models have to little extent been tested in this respect. In this paper we present recent experimental data from a series of threephase flow experiments focusing on how the pipe inclination, the gas density and the water cut affect the onset of transition to high holdup. The data have been compared to OLGAS 2000 predictions. The present tests have been carried out in a pipe with diameter 100 mm, which is an order of magnitude smaller than a typical gas-condensate pipe. Since the transition from low to high holdup involves phenomena that one can expect are pipe diameter sensitive, an important question is how well the models extrapolate to larger diameters. While the multiphase flow models used in today's commercially available tools are heavily based on tuning against experimental data, new generations of more mechanistically based models are likely to avail possible problems related to diameter scaling and extrapolation beyond the empirical data.
Liquid accumulation in gas-condensate pipelines - an experimental study
Flüssigkeitsansammlung in Gas-Kondensat-Rohrleitungen - Eine experimentelle Studie
2006
14 Seiten, 11 Bilder, 2 Tabellen, 5 Quellen
Conference paper
English
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