Estimation of mixing volumes in buoyant miscible displacement flows along near‐horizontal pipes

Taghavi, Seyed Mohammad; Frigaard, I.A.

doi:10.1002/cjce.21754

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…In comparison with many numerical simulations, (e.g., Alba et al. 2014; Hallez and Magnaudet 2008; Taghavi and Frigaard 2013; Taghavi et al. 2010, 2012), in this work the density is not constant and depends on the local mass fraction of heavy oil.…”

Section: Model Formulationmentioning

confidence: 78%

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Numerical study of crude oil batch mixing in a long channel

et al. 2018

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The main objective of this work is to predict the mixing of two different miscible oils in a very long channel. The background to this problem relates to the mixing of heavy and light oil in a pipeline. As a first step, a 2D channel with an aspect ratio of 250 is considered. The batch-mixing of two miscible crude oils with different viscosities and densities is modeled using an unsteady laminar model and unsteady RANS model available in the commercial CFD solver ANSYS-Fluent. For a comparison, a LES model was used for a 3D version of the 2D channel. The distinguishing feature of this work is the Lagrangian coordinate system utilized to set no-slip wall boundary conditions. The global CFD model has been validated against classical analytical solutions. Excellent agreement has been achieved. Simulations were carried out for a Reynolds number of 6300 (calculated using light oil properties) and a Schmidt number of . The results show that, in contrast to the unsteady RANS model, the LES and unsteady laminar models produce comparable mixing dynamics for two oils in the channel. Analysis of simulations also shows that, for a channel length of 100 m and a height of 0.4 m, the complete mixing of two oils across the channel has not been achieved. We showed that the mixing zone consists of the three different mixing sub-zones, which have been identified using the averaged mass fraction of the heavy oil along the flow direction. The first sub-zone corresponds to the main front propagation area with a length of several heights of the channel. The second and third sub-zones are characterized by so-called shear-flow-driven mixing due to the Kelvin–Helmholtz vortices occurring between oils in the axial direction. It was observed that the third sub-zone has a steeper mass fraction gradient of the heavy oil in the axial direction in comparison with the second sub-zone, which corresponds to the flow-averaged mass fraction of 0.5 for the heavy oil.

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Section: Model Formulationmentioning

confidence: 78%

“…Furthermore, these rates are shown to increase when the inclination angle increased and the displaced fluid is the denser one. The most recent research, which is closely related to the case of interest in our study, has been conducted by Taghavi and Frigaard (2013) and Taghavi et al. (2012).…”

Section: Introductionmentioning

confidence: 99%

Numerical study of crude oil batch mixing in a long channel

et al. 2018

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“…Due to the problematic rheological behaviors of non-Newtonian fluids with and without yield-stress, there are fewer experimental studies about fluid flows in concentric and eccentric annular geometries with similarity to wellbore annulus in primary cementing [4][5][6][7][8][9][10][11][12][13][14][15][16]. In these limited experimental studies, it has been established that the type of flow (laminar, transition, and turbulent) [5,[10][11][12]17,18] and degree of eccentricity affect displacement efficiency significantly [19]. These studies generally stated that turbulent displacement flow is more efficient than the laminar displacement flow [17,18], and the increasing standoff causes a significant effect on the displacement flow of the fluids and cement placement [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…In these limited experimental studies, it has been established that the type of flow (laminar, transition, and turbulent) [5,[10][11][12]17,18] and degree of eccentricity affect displacement efficiency significantly [19]. These studies generally stated that turbulent displacement flow is more efficient than the laminar displacement flow [17,18], and the increasing standoff causes a significant effect on the displacement flow of the fluids and cement placement [20][21][22]. In cases like washout sections, the effect of inner pipe eccentricity is not significant for displacement in the washout section [23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Use of Tracing Particles for Interface Tracking in Primary Cementing in an Eccentric Hele–Shaw Cell

et al. 2021

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We present the results of the displacement flows of different Newtonian and Herschel–Bulkley non-Newtonian fluids in a new-developed eccentric Hele–Shaw cell with dynamic similarly to real field wellbore annulus during primary cementing. The possibility of tracking the interface between the fluids using particles with intermediate or neutral buoyancy is studied. The behaviors and movements of particles with different sizes and densities against the primary vertical flow and strong secondary azimuthal flow in the eccentric Hele–Shaw cell are investigated. The effects of fluid rheology and pumping flow rate on the efficiency of displacement and tracing particles are examined. Moreover, the behavior of pressure gradients in the cell is described and analyzed. Successful results of tracing the interface using particles give us this opportunity to carry out a primary cementing with high quality for the cases that the risk of leakage is high, e.g., primary cementing in wells penetrating a CO2 storage reservoir.

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