.... Inclination angles varied from 30 ? to 70 ? from horizontal. The fluids used were air and water. Measurements included fluid velocities and reversal point. High-speed video cameras were used to record the flow regime transition (slug to annular) present in the system. Prediction using the film reversal models...

...-phase flow pattern in vertical pipe flow. Further objective is to develop new/improve existing mechanistic flow-pattern-transition models for high-liquid viscosity two-phase flow in upward vertical pipe flow. High-liquid viscosity flow pattern two-phase flow data was collected from open literature...

...]. Additionally, it has been reported that as system pressure increases, slugs may gradually evolve into smaller slugs or pseudo-slugs [8, 9], and the transition from slugs to pseudo-slugs may occur at lower vSG [10, 11], suggesting the importance of pseudo-slugs in high pressures. pseudo-slug flow...

..., starting from high co-current gas-liquid rates, a large number of different flow transitions are encountered if the gas rate is reduced. Some of these include: - Minimum in the pressure gradient (minimum in TPC) - Liquid loading (first liquid below liquid injection) - Flooding (all liquid below liquid...

... influences the dynamics of pipeline pressure, and liquid content and outlet rates; production rates span the region of transition between separated and slug flow regimes. Out-of-the-box model predictions of pressure drop can differ from measured values by 20% or more. While model predictions of liquid...

... [m/s] uF Liquid film velocity [m/s] uM Mixture velocity [m/s] USC Velocity of a spherical cap in a stagnant liquid [m/s] USG Superficial gas velocity [m/s] USL Superficial liquid velocity [m/s] We Gas Weber number gs Slug gas fraction G,C Critical gas fraction for the transition between bubbly flow...

...Flow pattern transition model for gas-highly viscous fluids in horizontal pipelines A Brito, R Cabello, J Marquez PDVSA Intevep, Venezuela J Trujillo GALP Energy, Portugal N Guzmán Lone Star College, USA ABSTRACT The increasing world oil demand has led to develop the large heavy and extra heavy oil...

... with a higher pressure in the injection line than in the well. This is as a result of the U-tube effect at shut-in of the well, the light fluid (production fluid) to be floated/absorbed to the heavy fluid (injection chemical). The corrosion rate and risk of pitting is greatest in the gas/liquid transition zone...

... a transition to stratified flow when the plate height closely matched the in situ water height at low water cuts. Introduction The flow of oil and water in pipes is commonly encountered in a number of industrial processes. These systems are particularly relevant to the oil industry in which achieving...

... well cases while it went from 90% to 94% for all of the data set, making it the best published mechanistic gas-liquid flow model for vertical upward flow from among the three models benchmarked in this study. production logging transition pressure drop two-phase flow implementation...

... are usually stratified at low velocities, but as flow-rate increases, transition from stratified to non-stratified flow patterns occur, and flow eventually transforms to disperse flow as flow velocities increases (Yusuf, et al., 2010a). In the disperse regime, significant pressure drop is experienced (Yusuf...

... and evaluated against data. A method for a seam­less transition between the two models is also presented. The result is a unified model, valid for inclinations from −5° (downward) to +90° (vertical upward), suitable for the strict requirements of complex coupled system optimization where smoothness...

... testing flow pattern upstream oil & gas production monitoring bhr group 2009 production control drillstem testing pressure gradient transition annular flow imperial college flowrate void fraction steady state slug flow reservoir surveillance An experimental study of wellbore phase...

... al s (6) model to annular concentric and eccentric geometries. Salcudean et al (13, 14) investigated the effect of flow obstruction geometry on pressures drops in horizontal two-phase flow. The effect of central and peripheral obstructions on flow pattern transitions was also studied by conducting...

... pipeline has no significant effect on flow pattern in the riser. The experimental flow pattern transitions of Omebere-Iyari (1) are compared to published theoretical models by Taitel et al. (11) and Barnea (12). Significant disparities exist between the predictions from theory and the experimental...

... ABSTRACT 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 gas-condensate pipelines...

... ABSTRACT A new theoretical model has been developed for determining flow regime transitions in two-phase gas-liquid flow in horizontal pipes. The theoretical model provides a physical explanation for the development of the perturbed interface of the stratified flow into a roll wave or slug...

...An experimental method for the prediction of slug-churn transition in two-phase flow based upon drift-flux model V C Samaras, D P Margaris Fluid Mechanics Lab., Mechanical Engineering and Aeronautics Dept. University of Patras, Greece Abstract The aim of the present paper is to present...

... ABSTRACT Severe slugging is reported from some field operations, when an increase in the production rate leads to a transition from steady stratified flow to slug flow in the pipeline. The slugs can be longer than anticipated for normal hydrodynamic slugging and the flow transients can...

... hydrodynamic slugs are generated in upward inclined sections, where transition from stratified to slug flow occurs, referred to a flow map, and grow large in the downstream stratified section. The field data are attempted to be reproduced by means of dynamic simulations. The discrepancies between the data...