A New Mechanistic Model for Two-Phase Flow Through Eccentric Horizontal Annulus

Omurlu, Cigdem; Özbayoğlu, A. Murat

doi:10.2523/100300-ms

Cited by 2 publications

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“…Exactly 1174 experimental data points integrated from literature and experiments are harnessed to develop this model. Data was obtained from studies by Sunthankar et al,(2000), Zhou et al,(2004), Omurlu et al,(2006), Ozbayoglu & Omurlu (2007), Osgouei et al,(2010), Mendes et al,(2011), Gschnaidtner (2013), Nossen et al,(2017) and integrated with experimental data from the fully eccentric annulus setup. The developed flow regime transitions in this study is based on different annulus eccentricities, hydraulic diameters, fluid properties as well as gas and liquid superficial velocity ranges.…”

Section: Effect Of Regime Transitions On Pdf Featuresmentioning

confidence: 99%

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Gas-liquid flow regimes in horizontal annulus

Eyo

Lao

2019

Journal of Petroleum Science and Engineering

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Gas-liquid flows in annulus channels are frequently encountered in the underbalanced drilling operation when the gasified drilling fluid is used. Accurate characterization of two-phase flow regimes in such conduits is critically important in order to gain a better understanding of the flow behaviours in the channels, thus to ensure a successful drilling operation achieved. In this paper experimental studies regarding gas-liquid flows in a concentric and fully eccentric horizontal annulus were reported. The test section setups of the flow loop have a length of 10.8 m, with outer and inner pipe diameters of 0.0768 m and 0.060 m respectively. Air and water at atmospheric pressure constituted the gas and liquid phases and the range of gas and liquid superficial velocities investigated during this study was 0.14-24 m/s and 0.15-2.78 m/s respectively. Flow regimes observed in both annulus setups by high speed camera imaging were dispersed bubble, elongated bubble, slug, wavy slug, churn, wavy annular and annular. A detailed description of the flow regimes with different features are presented together with high quality images. The local liquid holdup time series together with its probability density function (PDF) are used to gain more insights about the characteristics of the observed flow regimes. Effects of the annulus eccentricity on the observed flow regimes are also investigated. It is found that the annulus eccentricity affects the shape and structure of the elongated bubble, wavy annular and annular flow regimes. It is also observed that the annulus eccentricity causes the transition from elongated bubble to dispersed bubble to take place at higher liquid superficial velocities. It is also found that in the fully eccentric annulus causes transitions between different flow regimes to occur at higher liquid and lower gas superficial velocities when compared with that of concentric ones. An improved flow regime map is proposed based on gas and liquid Froude numbers by integrating the test results from this study with over 1000 data points found in literature.

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Section: Effect Of Regime Transitions On Pdf Featuresmentioning

confidence: 99%

“…They also developed theoretical basis for flow regime 69 transitions. 70 Omurlu, Metin and co-workers (Omurlu et al, 2006;Metin & 71 Ozbayoglu, 2007) studied extensively two-phase flow through 72 fully eccentric horizontal annulus. Their experimental setups 73 consisted of different Do (0.0932, 0.1143 m) and Di (0.0488 and 74 0.05715 m).…”

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confidence: 99%

Gas-liquid flow regimes in horizontal annulus

Eyo

Lao

2019

Journal of Petroleum Science and Engineering

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“…Metin & Co-workers 4,5 , Osgouei and others [6][7][8] , Gschnaidtner, 9 and Nossen et al 10 . Recently, Eyo & Lao 11 presented studies on gas-liquid flow regimes in horizontal annuli.…”

Section: Osamusali and Chang 3 Omurlumentioning

confidence: 99%

Slug flow characterization in horizontal annulus

Eyo

Lao

2019

AIChE Journal

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In order to characterise slug flows in annuli channels and highlight the effect of the eccentricity on the flow behaviours, experiments were conducted in two horizontal annuli setups (i) concentric and (ii) fully eccentric using air and water as the testing fluids. The range of air and water superficial velocities investigated were 0.45-3.49 m/s and 0.15-2.77 m/s respectively. Slug parameters measured using conductance probes designed for this study include slug length, translational velocity, slug frequency and slug holdup. It is found that the slug translational velocity is unaffected by the annulus eccentricity, however parameters including slug frequency, slug holdup and slug lengths have a higher value in the fully eccentric annulus when compared with the concentric one. We introduced a new definition of hydraulic diameter, which reconciles the correlation between the dimensionless mean slug length and the mixture velocity of the horizontal annuli with different setups.

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A New Mechanistic Model for Two-Phase Flow Through Eccentric Horizontal Annulus

Cited by 2 publications

References 0 publications

Gas-liquid flow regimes in horizontal annulus

Gas-liquid flow regimes in horizontal annulus

Slug flow characterization in horizontal annulus

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