One-dimensional model of turbulent flow of non-Newtonian drilling mud in non-prismatic channels

Welahettige, Prasanna; Lundberg, Joachim; Bjerketvedt, Dag; Lie, Bernt; Vaagsaether, Knut

doi:10.1007/s13202-019-00772-9

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…It is worth mentioning that in this work the liquid phase represents the drilling fluid, which is known to exhibit non-Newtonian behavior to meet safety and reliability requirements for the well drilling process [1,4,29,30]. Also, the geometry of the wellbore is complex, together with the possible presence of transition to a turbulent flow regime in the drilling column and in the annular region.…”

Section: Numerical Modelmentioning

confidence: 99%

CFD–DEM simulation of mud cake formation in heterogeneous porous medium for lost circulation control

Poletto

Junqueira

2020

J Braz. Soc. Mech. Sci. Eng.

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The lost circulation is a problem commonly observed in well drilling operations under overbalanced pressure conditions. Among the geological formation characteristics that can intensify the loss of drilling fluid, the presence of highly permeable regions is one of the most critical. In this case, corrective measures are necessary, like the use of lost circulation materials (LCM) to build a mud cake in the porous substrate, sealing the pores, and controlling the lost circulation. This work presents a numerical study to understand the influence of fluid-particle interaction under dynamic filtration on the process of particle packing in porous media, resembling the use of LCMs to grow a mud cake and reduce the fluid invasion. The flow of an incompressible Newtonian fluid in a porous medium modeled in pore scale is considered, being the voids structured as an anisotropic array of staggered solid cylinders. The LCM is considered as solid and discrete spherical particles (d p = 0.75 mm) immersed in a water-glycerin fluid. A Euler-Lagrange approach to model the liquid-solid two-phase flow is employed, with the simulation being resorted via the dense discrete phase model coupled to the discrete element method (DEM). The DEM computes collision and friction forces present in the particle-particle and particle-wall interactions. Variation effects for different values of the Reynolds number in the vertical channel Re CH,i (125, 250, 500) and the lost circulation intensity measured by the initial fluid loss ratio Q loss (5, 10, 20%) are considered. By releasing solid particles, the fluid loss ratio, relative permeability, particle layer dimensions, and also the vertical channel pressure are altered. For an initial fluid loss ratio of 20%, the decay in Q loss after 60 s for Re CH,i values of 125, 250 and 500 is, respectively, 17%, 13% and 12%. The variation of the initial fluid loss ratio Q loss dramatically influences the number of particles that forms the bed. After 60 s, no particle has entered the porous matrix for Q loss = 5%. When Q loss = 10%, the particles build a bed, and for 20%, the plugging of the substrate occurs.

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Section: Numerical Modelmentioning

confidence: 99%

CFD–DEM simulation of mud cake formation in heterogeneous porous medium for lost circulation control

Poletto

Junqueira

2020

J Braz. Soc. Mech. Sci. Eng.

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Turbulent Flow Simulation of the Nonnewtonian Fluids Through a Porous Medium Using Les Turbulence Model

Taheripour,

Gholami Malek-Abad,

Khayyaminejad

et al. 2024

Special Topics Rev Porous Media

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In this study, fully turbulent flow of non-Newtonian fluids is studied in a square periodic array as a porous medium, with porosity ranging from 0.5 to 0.84. Large eddy simulation (LES) is used as an effective turbulence model at a Reynolds number of 40,000. The governing equations are solved by Ansys Fluent commercial software for various porosities. The power-law and Carreau approaches are employed to model the dilatant and pseudo-plastic non- Newtonian fluids. In this study, the power-law and Carreau models are also compared. The results showed that an increase in porosity has a significant effect on flow parameters. Specifically, as porosity increases, vorticities, pressure, and velocity values increase within the computational domain. Moreover, it was observed that the Carreau model has a greater ability to obtain more realistic results in porous media domain and complex geometries.

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Efecto fluido dinámico de una nueva configuración de boquillas de una broca PDC sobre el diferencial de presión

Jiménez¹,

Carreño²,

Chaves³

et al. 2022

revfue

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Los costos operacionales asociados a la extracción de petróleo han tenido un aumento significativo durante los últimos 10 años. Sumado a lo anterior, se ha evidenciado una fluctuación en los precios de venta del crudo que ha representado un reto para las compañías al tener que buscar estrategias para mejorar el desempeño de todos los procesos involucrados en la explotación de hidrocarburos, entre los que se incluyen aspectos como la planeación y perforación del pozo (Amer et al., 2017). Las investigaciones en materia de este campo tienen como principal objetivo reducir los tiempos de trabajo. Para esto, es necesario optimizar distintos parámetros de la operación de perforación como lo son el comportamiento del lodo, la integridad del pozo y el comportamiento de la broca para mejorar las tasas de penetración (ROP) (Mohammed et al., 2018). El desempeño de la broca es un factor clave en la mejora de la perforación y la reducción de los costos asociados. A través de modificaciones en el cuerpo, los cortadores o las boquillas con relación a las brocas convencionales, pueden alcanzarse comportamientos que bien podrían ser provechosos desde el punto de vista técnico y financiero. El presente estudio se centra en analizar el efecto de la modificación del ángulo de las boquillas de una broca PDC a través de la simulación del comportamiento del lodo utilizando dinámica computacional de fluidos. Los resultados arrojan que modificaciones de 90° en el ángulo de las boquillas logran reducir las presiones de salida de la broca al punto que se generan diferenciales de hasta 1200 psi entre la formación y la salida de las boquillas, permitiendo un estado de bajo balance entre la broca y las paredes del pozo contribuyendo al aumento de la ROP mediante la disminución en las restricciones que el lodo aporta al paso de la broca.

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One-dimensional model of turbulent flow of non-Newtonian drilling mud in non-prismatic channels

Cited by 3 publications

References 29 publications

CFD–DEM simulation of mud cake formation in heterogeneous porous medium for lost circulation control

CFD–DEM simulation of mud cake formation in heterogeneous porous medium for lost circulation control

Turbulent Flow Simulation of the Nonnewtonian Fluids Through a Porous Medium Using Les Turbulence Model

Efecto fluido dinámico de una nueva configuración de boquillas de una broca PDC sobre el diferencial de presión

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