Two-phase gas-liquid flow in concentric and fully eccentric annuli. Part II: Model development, flow regime transition algorithm and pressure gradient

Ibarra, Roberto; Nossen, Jan; Tutkun, Murat

doi:10.1016/j.ces.2019.02.021

Cited by 12 publications

(6 citation statements)

References 24 publications

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“…For the vertical and horizontal dimensionless rise velocities, Dumitrescu [199] found Fr v = 0.351 and Benjamin [235] found Fr h = 0.542, respectively. This was used later by Ibarra et al [236] for horizontal and low-inclination annuli, in which the models developed agreed well with their experimental work later presented in [237]. The rise velocity determined from simulations along with those predicted by correlations from Lizarraga-Garcia et al [18], Hasan and Kabir [62] and Ibarra and Nossen [226] are presented in Table 7.4.…”

Section: Resultssupporting

confidence: 58%

Development of a multiphase lattice Boltzmann model for high-density and viscosity ratio flows in unconventional gas wells

Mitchell¹

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The confined flow of multiphase fluids is relevant in a range of applications in both science and engineering. For example, the two-phase flow of gas and liquid can commonly be observed in boilers used for power production, nuclear reactors (particularly in a loss-of-coolant accident) as well as in the transportation of hydrocarbons in the oil and gas industry. The optimal design and operation of these systems relies on an understanding of how the phases interact and the behaviour emergent from these interactions. This thesis studies multiphase flows in the field of natural gas extraction from unconventional reservoirs, with a focus on coal seam gas (CSG). In this context, the bottom hole pressure (BHP) in a natural gas well is an important parameter in the effective design of well completions and artificial lifting systems. Poor estimation of this can lead to liquid loading in the wellbore and reduced efficiency of the extraction process. The complex interaction of production gas and the associated water can increase the uncertainty in pressure gradients and ultimately impact the BHP estimation. A significant body of research has explored pressure gradients in the co-current multiphase flows found in conventional gas extraction, but these are not expected to hold for the counter-current regimes present in CSG production. Therefore, this research aimed to develop a fully resolved-numerical model for the simulation of simultaneous gas and liquid transport in scenarios applicable to CSG extraction. When two-phases flow in a confined environment such as a pipe or conduit, the topology of the interface is described by commonly observed flow regimes. When the pipe is in a vertical configuration, the typical regimes include bubble, slug, churn and annular flow. The models that describe the liquidgas interactions are typically dependent on the flow regime and can significantly impact the accuracy of pressure predictions. As a result, knowledge of the flow regime is required a priori to predicting the pressure gradient. Once this has been determined, the uncertainty associated with the phase interaction models can still deteriorate the practical use of predictive tools. The rise velocity of elongated bubbles in the slug flow regime has recently been identified in the literature as impacting greatly on the estimation of liquid hold up and pressure gradients in a piping system. Understanding the behaviour of these bubbles, termed Taylor bubbles, allows operators to reduce pressure oscillations in the wellbore and more accurately forecast production over the life of the well. This work seeks to capture the behaviour of these bubbles in flow configurations applicable to CSG extraction. This involves modelling annular pipe systems at a range of inclinations as well as with fluids propagating in co-and counter-current directions. This thesis presents the development, verification and validation of a phase-field lattice Boltzmann method (PFLBM) that allows for the simulation of dynamic liquid-gas flows with density ratios on th...

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Section: Resultssupporting

confidence: 58%

Development of a multiphase lattice Boltzmann model for high-density and viscosity ratio flows in unconventional gas wells

Mitchell¹

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“…Before the application of the flow pattern dependent multi-layered model, the prediction of the fluid flow pattern may be required. However, the gas-liquid fluid flow pattern prediction can be performed using the methods suggested in literature (Caetano et al, 1992;Ibarra et al, 2019). It is important to note that the mathematical models are only valid for horizontal and inclined flows and does not taken into account the effect of the inner pipe rotation.…”

Section: Liquid-film/gas Pocket Regionmentioning

confidence: 99%

“…The calculation of the shear stresses in the mathematical models for each of the flow patterns require the determination of the wall and interfacial friction factors. The wellbore and drillpipe wall friction factors for the concentric and eccentric annuli can be determined using the models suggested by Ibarra et al (2019). The interfacial friction factors may be determined as follows:…”

Section: Annuli Pressure Gradientmentioning

confidence: 99%

Effect of two-phase gas-liquid flow patterns on cuttings transport efficiency

Salubi

Mahon

Oluyemi

et al. 2022

Journal of Petroleum Science and Engineering

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“…Caetano et al (1992) presented friction factor equations for axial steady-state annuli flows, expressed as a function of the annuli friction geometry parameter and determined from the solution of the continuity equation, equation of motion and the Fanning equation. Although these equations were derived for fully developed Newtonian annuli flows, some studies have applied them when mathematically modelling non-Newtonian annuli flows (Ibarra et al, 2019;Lage and Time, 2002). However, the Caetano et al (1992) friction factors equations cannot be applied to address the effect of the inner pipe rotation on non-Newtonian annuli fluid flows.…”

Section: Introductionmentioning

confidence: 99%

The combined effect of fluid rheology, inner pipe rotation and eccentricity on the flow of Newtonian and non-Newtonian fluid through the annuli

Salubi

Mahon

Oluyemi

2022

Journal of Petroleum Science and Engineering

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Two-phase gas-liquid flow in concentric and fully eccentric annuli. Part II: Model development, flow regime transition algorithm and pressure gradient

Cited by 12 publications

References 24 publications

Development of a multiphase lattice Boltzmann model for high-density and viscosity ratio flows in unconventional gas wells

Development of a multiphase lattice Boltzmann model for high-density and viscosity ratio flows in unconventional gas wells

Effect of two-phase gas-liquid flow patterns on cuttings transport efficiency

The combined effect of fluid rheology, inner pipe rotation and eccentricity on the flow of Newtonian and non-Newtonian fluid through the annuli

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