The objectives of this study have been to acquire new experimental data for a high pressure recombined gas-oil-water systems and to compare the data with predictions from commercial multiphase flow models. From a large number of experiments, data at 0.75 m/s gas velocity were selected. Gas-liquid flow patterns were compared to model predictions. Furthermore, measured hold-ups and pressure drops at two liquid velocities; 0.45 m/s and 1.35 m/s, at a constant gas velocity of 0.75 m/s and a constant input water cut of 10 % were compared to corresponding OLGAS predictions. The comparison shows that gas-liquid flow patterns are predicted quite well, except for an over-prediction of the slug flow region at high inclination and high water cut. Predictions of liquid hold-up are for most conditions inside 10 % of the measured value, which is considered to be acceptable. However, the effect of inclination on liquid hold-up is expressed differently through opposite trends for the simulations compared to the measurements. OLGAS under-predict the water hold-up by as much as 55 % for some conditions. The main reason to the under-prediction is that OLGAS assumes there is almost no-slip between the oil and the water, which means that the liquids are fully dispersed. In the experiments we observe that the degree of dispersion varies and that several conditions include a free water phase with a dispersion flowing on top of it. Frictional pressure drop is dramatically under-predicted for measurements at the lower liquid velocity and the under-prediction approaches 75 % as the inclination angle is increased towards +10 deg. Finally, a comparison of the total pressure drop for a large part of the test matrix shows large over-prediction at negative inclinations and under-predicted at positive inclinations.
Investigation of three-phase gas-crude oil-water flow in inclined pipes
2005
15 Seiten, 11 Bilder, 2 Tabellen, 19 Quellen
Conference paper
English
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