Flow of slurries of coarse particles at high solids concentrations

Televantos, Y.; Shook, C. A.; Streat, M.; Carleton, A. J.

doi:10.1002/cjce.5450570302

Cited by 54 publications

(22 citation statements)

References 3 publications

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“…For the solution, we need closure relationships for the shear stresses, the friction force, the particle-settling velocity (u p ) and the dispersion coefficient of the solids, D. D is estimated through a procedure described in Appendix B. The shear stresses are estimated in a standard manner for two-phase flows 21 as: Another approach is by Martins and Santana, 10 who also use the Fanning friction factor, but use a different expression for turbulent flow, derived from experimental work, 25 The estimation of the interfacial-friction factor, f i , is done by many researchers through the use of the expression proposed by Televantos et al 26 :…”

Section: Two-layer Modelingmentioning

confidence: 99%

“…Eq. 20 is the Colebrook formula for Newtonian fluids flowing in rough pipes with the difference that Televantos et al 26 used the factor 2f i , instead of f i , to account for the increase in the friction factor caused by particle collision with the bed and by entrainment and deposition of particles. According to Cheremisinoff and Gupta, 27 the Televantos study states that the magnitude of f i is not of critical importance in the model.…”

Section: Two-layer Modelingmentioning

confidence: 99%

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Flow Patterns and Minimum Suspension Velocity for Efficient Cuttings Transport in Horizontal and Deviated Wells in Coiled-Tubing Drilling

Kelessidis

Bandelis

2004

SPE Drilling &Amp; Completion

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Coiled-tubing drilling (CTD), which has grown significantly in recent years, is normally associated with high-angle to horizontal and extended-reach wells. In these applications, however, hole problems become more troublesome because of inefficient cuttings removal. Among the many parameters affecting efficient cuttings transport in CTD are pump rates, well dimensions, fluid properties, solid sizes, solid loading, and hole inclination. Several attempts have been made to determine the optimum operating range of these parameters, but complete and satisfactory models have yet to be developed.The purpose of this paper is as follows:• To provide a critical review of the state-of-the-art modeling for efficient cuttings transport during CTD.• To present the critical parameters involved.• To establish their range according to what is observed in practice.• To propose a different approach for predicting the minimum suspension velocity.• To describe the laboratory system that has been set up. The primary purpose of the flow system is to enable the gathering and publication of good-quality data that, together with previously published data, could further enhance our understanding of the flow of solid/liquid mixtures in annuli.

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Section: Two-layer Modelingmentioning

confidence: 99%

Section: Two-layer Modelingmentioning

confidence: 99%

Flow Patterns and Minimum Suspension Velocity for Efficient Cuttings Transport in Horizontal and Deviated Wells in Coiled-Tubing Drilling

Kelessidis

Bandelis

2004

SPE Drilling &Amp; Completion

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“…12 The interfacial friction coefficient, f 12 , in Eq. 9 is evaluated using a modified Colebrook formula for rough pipes (Televantos et al 16 ).…”

Section: Conservation Equationsmentioning

confidence: 99%

Modeling of Transient Cuttings Transport in Underbalanced Drilling (UBD)

Doan¹,

Oguztöreli

Masuda

et al. 2003

SPE Journal

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Underbalanced drilling (UBD) holds several important advantages over conventional drilling technology. These include minimization of formation damage, faster penetration rate, and ability for evaluation of reservoir productivity during the drilling process. As UBD technology matures, it has also been used more and more in different applications. However, many aspects of UBD technology remain poorly understood. The model presented in this paper seeks to understand the mechanisms involved in the transport of cuttings in UBD.The model simulates the transport of drill cuttings in an annulus of arbitrary eccentricity and includes a wide range of transport phenomena, including cuttings deposition and resuspension, formation, and movement of cuttings bed. The model consists of conservation equations for the fluid and cuttings components in the suspension and the cuttings deposit bed. Interaction between the suspension and the cuttings deposit bed, and between the fluid and cuttings components in the suspension, are incorporated. Solution of the model determines the distribution of fluid and cuttings concentration, velocity, fluid pressure, and velocity profile of cuttings deposit bed at different times.The model is used to determine the critical transport velocity for different hydrodynamic conditions. Results from the model agree quite closely, qualitatively, with experimental data obtained from a cuttings transport flow loop at the Technology Research Center of the Japan Natl. Oil Corp. (TRC/JNOC)'s Kashiwazaki Test Field in Japan. These results show the importance of slippage in the formation of the cuttings deposit bed. The model is useful in evaluating the minimum flow rate for effective cuttings removal in UBD.

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“…Solid-liquid flow models are classified according to the solid phase distribution in the carrier liquid. The basic flow patterns observed in slurries of coarse particles are: stationary bed, moving bed, heterogeneous flow, and pseudo-homogeneous flow, [2], [5] and [6]. It has been the endeavor of researchers around the world to develop accurate models for pressure drop and concentration distribution in slurry pipelines.…”

Section: Introductionmentioning

confidence: 99%

Influence of Coarse-Dispersive Solid Phase on the ‘Particles-Wall’ Shear Stress in Turbulent Slurry Flow with High Solid Concentration

Bartosik¹

2010

Archive of Mechanical Engineering

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The paper concerns simulation of fully developed and axially-symmetrical turbulent flow of coarse-dispersive slurry if all solid particles have similar size and shape with particles diameter from 1 mm to 5 mm, solid density from 1045 kg/m 3 to 3000 kg/m 3 , and solid concentration by volume from 20% to 40%. The author examines the influence of particle diameter on additional shear stress due to the 'particles-wall' interactions for moderate and high solid concentration. The mathematical model was developed using Bagnold's concept, [26] and assumes that the total wall shear stresses are equal to the sum of 'liquid-wall' and 'particles-wall' shear stresses. The mathematical model was successfully verified with own measurements of frictional head loss in vertical coarse -dispersive slurry flow, named: 'sand-water', 'polystyrene-water' and 'pvc-water', [10], [26]. The mathematical model can predict 'particles-wall' shear stress, pressure drop and friction factor for coarse-dispersive turbulent slurry flow in a pipe, [10].The aim of the paper is to present qualitative and quantitative dependence of solid particle diameter, solid particle density, solid concentration, and Reynolds number for carrier liquid phase on the 'particles-wall' shear stress. It is demonstrated that the solid particle diameter plays crucial role in its dependence on the 'particleswall' shear stress. It was proved that in particular flow conditions the 'particles-wall' shear stress is much higher compared to the carrier liquid wall shear stress.

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Flow of slurries of coarse particles at high solids concentrations

Cited by 54 publications

References 3 publications

Flow Patterns and Minimum Suspension Velocity for Efficient Cuttings Transport in Horizontal and Deviated Wells in Coiled-Tubing Drilling

Flow Patterns and Minimum Suspension Velocity for Efficient Cuttings Transport in Horizontal and Deviated Wells in Coiled-Tubing Drilling

Modeling of Transient Cuttings Transport in Underbalanced Drilling (UBD)

Influence of Coarse-Dispersive Solid Phase on the ‘Particles-Wall’ Shear Stress in Turbulent Slurry Flow with High Solid Concentration

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