Viscoplastic fluid flow in irregular eccentric annuli due to axial motion of the inner pipe

Hussain, Quazi E.; Sharif, M. A. R.

doi:10.1002/cjce.5450750606

Cited by 19 publications

(16 citation statements)

References 14 publications

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“…Furthermore, due to gravity there will be a strong tendency for the cuttings to accumulate in this region, forming a bed of settled cuttings or a partial obstruction of the annular space between the drill string and the formation. [8] Solids accumulating in this region hinder and can even interrupt the drilling process. [9] To suppress the accumulation of more solids, knowledge of the flow patterns in eccentric and partially-obstructed annuli is essential for the design and operation of these wells.…”

Section: Introductionmentioning

confidence: 99%

Fluid dynamics study of the flow and pressure drop analysis of a non‐Newtonian fluid through annular ducts with unusual cross‐sections

et al. 2016

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This paper concerns an experimental and computational study of the laminar flow developed by a pseudoplastic fluid through a partially-obstructed annulus, considering the effects of eccentricity and inner cylinder rotation. For the eccentric cases the eccentric rotation of the inner tube is applied, which is a novelty in the literature. Pressure drop experimental data are reported for flows of 3 and 9 m 3 /h of a 1 mg/g xanthan gum aqueous solution through a concentric and a 46 % eccentric annulus with partial obstruction of 6 mm, for cases with and without rotation of the inner cylinder (0 and 400 rpm). Numerical simulations were performed using computational fluid dynamics (CFD) techniques which allowed for reporting of axial velocity profiles, apparent viscosity distribution, and pressure drops for a range of eccentricity values (0, 23, and 46 %) and obstruction heights (0, 6, and 12 mm), which were systematically compared for cases with and without rotation of the inner tube (0 and 400 rpm). Comparisons between numerical calculations and the flow data indicated, in general, very close agreement. Eccentric rotation of the inner cylinder presented a distortion effect on the axial velocity and apparent viscosity profiles for the high eccentricity case (46 %) with high obstruction (12 mm), where two maxima regions were observed, one of them near the inner cylinder.

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Section: Introductionmentioning

confidence: 99%

Fluid dynamics study of the flow and pressure drop analysis of a non‐Newtonian fluid through annular ducts with unusual cross‐sections

et al. 2016

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“…Overcoming these setbacks, Mitsoulis et al proposed a new HB stress function based on Papanastasiou idea on Bingham type materials for a large but finite apparent viscosity value at vanishing shear rate as

\overset{true‾}{\overset{τ}{true}} = (K | \dot{γ} |^{n - 1} + τ_{0} \frac{1 - \exp (- m | \dot{γ} |)}{| \dot{γ} |}) \overset{true‾}{\overset{\dot{γ}}{true}},

where the regularization parameter m is a large number to guarantee large apparent viscosity at vanishing rate‐of‐strain at a value of

m τ_{0} + K | \dot{γ} |^{(n - 1)})

. This model has been implemented in various numerical modelling for HB fluids …”

Section: Introductionmentioning

confidence: 99%

Modified Yield Power‐Law fluid flow in narrow annuli with inner rotating pipe

et al. 2014

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A proposed viscosity model for Yield Power‐Law fluid by Souza Mendes and Dutra (SMD), devoid of discontinuities at vanishing shear rate, is adopted in a 3D CFD simulation study. Radial distributions of axial, tangential, and coupled components of velocities are measured along concentric and eccentric narrow annuli. The flow is assumed to be fully‐developed, laminar, and steady state. Several parameters such as diameter ratios, eccentricities, and inner pipe angular speeds were varied to analyze their influence on the flow distributions and annular pressure losses. The simulated results of radial distributions of axial and tangential velocities show good agreement with experimental data and analytic solutions from previous studies. Annular flow instabilities in the form of Taylor vortices in the flow fields are briefly discussed. This study shows how reliable CFD simulations can replicate the actual, yet complex, oil and gas drilling operations.

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“…The model has been extensively validated against field data (Wagner et al 1993;Robello et al 2001;Rommetveit et al 2004). A recently numerical study (Hussain and Sharif 2009) indicated the reduction of surge pressure with the increase in eccentricity. For a partially blocked eccentric annulus with cuttings bed, the surge pressure decreases with the increase in the bed thickness.…”

Section: Literature Reviewmentioning

confidence: 99%

Surge and Swab Pressure Predictions for Yield-Power-Law Drilling Fluids

Crespo

Ahmed

Saasen

2010

SPE Latin American and Caribbean Petroleum Engineering Conference

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Surge and swab pressures have been known to cause formation fracture, lost circulation and well control problems. Accurate prediction of these pressures is of crucial importance in terms of estimating the maximum tripping speeds to keep the wellbore pressure within specified limits of the pore and fracture pressures. It also plays a major role in running casings, particularly with narrow annular clearances. Existing surge/swab models are based on Bingham Plastic (BP) and Power law (PL) fluid rheology models. However, in most cases, these models cannot adequately describe the flow behavior of drilling fluids.This paper presents a new analytical solution, which is casted into a simplified model (dimensionless correlation) to predict pressure surge in a more convenient way. The steady state laminar flow equation is solved for narrow slot geometry to approximate the flow in concentric annulus with inner pipe axial movement considering yield-power-law (YPL) fluid. The YPL rheology model is usually preferred because it provides a better description of the flow behavior of most of drilling fluids. The analytical solution yields accurate predictions, though not in convenient forms. Thus, a numerical scheme has been developed to obtain the solutions. After conducting an extensive parametric study, dimensional analysis techniques were applied primarily to develop a simplified model that does not require a cumbersome numerical procedure. The new model is expressed in terms of dimensionless parameters.The performance of the new model has been rigorously tested. Comparisons of the model predictions with previously published results have shown a satisfactory agreement. In most cases, the model makes better predictions in terms of closeness to relevant field measurements. That is due to the application of a more realistic rheology model. The presented model is very useful for slim hole, deepwater and extended reach drilling applications.

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Viscoplastic fluid flow in irregular eccentric annuli due to axial motion of the inner pipe

Cited by 19 publications

References 14 publications

Fluid dynamics study of the flow and pressure drop analysis of a non‐Newtonian fluid through annular ducts with unusual cross‐sections

Fluid dynamics study of the flow and pressure drop analysis of a non‐Newtonian fluid through annular ducts with unusual cross‐sections

Modified Yield Power‐Law fluid flow in narrow annuli with inner rotating pipe

Surge and Swab Pressure Predictions for Yield-Power-Law Drilling Fluids

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