Inclination Effects on Flow Characteristics of High Viscosity Oil/Gas Two-Phase Flow

Jeyachandra, Benin Chelinsky; Sarica, Cem; Zhang, Hongquan; Pereyra, Eduardo

doi:10.2118/159217-ms

Cited by 14 publications

(7 citation statements)

References 16 publications

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“…All tests were conducted for horizontal flow and oil viscosities range from 0.121 Pa s to 1.0 Pa s. Kora (2010) conducted experiments and developed correlations for slug liquid holdup in horizontal high viscosity oil-gas flow. Jeyachandra (2011) studied the effect of the inclination angle for horizontal and nearhorizontal flow.…”

Section: Introductionmentioning

confidence: 99%

Unified drift velocity closure relationship for large bubbles rising in stagnant viscous fluids in pipes

Moreiras

Pereyra

Sarica

et al. 2014

Journal of Petroleum Science and Engineering

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Section: Introductionmentioning

confidence: 99%

Unified drift velocity closure relationship for large bubbles rising in stagnant viscous fluids in pipes

Moreiras

Pereyra

Sarica

et al. 2014

Journal of Petroleum Science and Engineering

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“…Both Basha et al (2014), who worked with high inclinations and medium diameters, and Jeyachandra et al (2012), who worked with high viscosity oil, identified this same behavior concerning the inclination. However, apart from the single-phase flow, which presented a generally linear behavior, the relation between the pressure drop and the inclination could not be more quantitatively characterized.…”

Section: Pressure Drop and Pipe Wall Stressmentioning

confidence: 61%

CFD study and experimental validation of low liquid-loading flow assurance in oil and gas transport: studying the effect of fluid properties and operating conditions on flow variables

Martínez

Pereyra

Ratkovich

2020

Heliyon

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Low liquid-loading flow frequently occurs during the transport of gas products in various industries, such as in the Oil & Gas, the Food, and the Pharmaceutical Industries. Even small amounts of liquid can have a significant effect on the flow conditions inside the pipeline, such as increased pressure loss, pipe wall stresses and corrosion, and liquid holdup along the pipeline. However, most studies that analyze this type of flow only use atmospheric pressures and horizontal 1-in or 2-in pipes, which do not accurately represent the range of operating conditions present in industrial applications. Therefore, this study focused on modeling low liquid-loading flow in mediumsized (6-10 in) pipes, using CFD simulations and experimental data from the University of Tulsa, and then applying it to real operating conditions from a Colombian gas pipeline. An acceptable difference was observed between experimental and CFD data, both for the liquid holdup (18%) and for the pressure drop (12%). Variables like pressure drop and wall shear stress increase with phase velocity, operating pressure, and pipe inclination. Liquid holdup increases with liquid velocity but decreases with all other factors. The relation of flow variables with phase velocities is of particular interest: Doubling the gas velocity decreased holdup 70% and increased pressure drop tenfold. On the other hand, the presence of the liquid phase seems to be more influential on process variables than its exact flowrate; the introduction of the liquid phase to a single-phase gas causes an increase in pressure loss by a factor of three, but doubling the liquid velocity only increases the pressure loss by a further 30%.

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“…Once the pipe is set, the second plug is released, which causes the fluid to drain and the bubble to enter the pipe and displace the liquid. The entrance of the bubble occurs due to gravitational potential energy generated from the hydrostatic pressure difference between the initial and final segment of the bubble nose [26]. The measuring procedure consisted of one calibrated chronometer set to start as soon as the upper end plug was released.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the Drift Flux in Two-Phase Gas-Liquid Slug-Flow along Horizontal and Inclined Pipelines through Experimental (Non)-Newtonian and CFD Newtonian Approaches

Pico¹,

Valdés²,

Ratkovich³

et al. 2018

JFFHMT

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The objective of this study is to analyze the influence of the physical properties of Newtonian and Non-Newtonian fluids, such as density, effective viscosity and surface tension, as well as operational parameters of the piping, such as diameter, length and angle of inclination, on the drift velocity for twophase gas-liquid flow. This study comprises a Computational Fluid Dynamics (CFD) approach for Newtonian fluids and an experimental approach for both, Newtonian and Non-Newtonian fluids. The simulation model consisted of half a section of a circular pipe with a symmetry plane. This model was calibrated through a mesh independence test, which considered experimental and literature data as benchmarking values for both low and high viscosity Newtonian fluids. The results obtained through the CFD model showed good agreement with the experimental data gathered for the present study, keeping the experimental deviations under 10% for most (roughly 95%) of the cases considered. The relationship between the Froude number (Fr) and the Viscosity number (Nvis) was studied and an inverse exponential tendency was found for all the parameters and fluids tested, which agrees with the models proposed in literature. The data gathered for all fluids on the drift velocity's behavior against operational parameters such as length, diameter and inclination, showed the influence of the governing forces for each case based on dimensionless analysis using Eötvös (Eö) and Reynolds (Re) numbers. For dominant capillary or viscous forces on the system, the drift velocity changed with the variation of these parameters. However, it was found that for dominant inertial and gravitational forces, the drift velocity maintained a constant value regardless of the operational settings. Finally, it was observed that the rheological nature found for the Non-Newtonian fluids has a significant influence on the drift velocity's behavior, deviating its patterns from the Newtonian fluids as the effective viscosity changed.

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Inclination Effects on Flow Characteristics of High Viscosity Oil/Gas Two-Phase Flow

Cited by 14 publications

References 16 publications

Unified drift velocity closure relationship for large bubbles rising in stagnant viscous fluids in pipes

Unified drift velocity closure relationship for large bubbles rising in stagnant viscous fluids in pipes

CFD study and experimental validation of low liquid-loading flow assurance in oil and gas transport: studying the effect of fluid properties and operating conditions on flow variables

Analysis of the Drift Flux in Two-Phase Gas-Liquid Slug-Flow along Horizontal and Inclined Pipelines through Experimental (Non)-Newtonian and CFD Newtonian Approaches

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