Equivalent circulating density modeling of Yield Power Law fluids validated with CFD approach

Erge, Oney; Ozbayoglu, Evren; Miska, Stefan; Yu, Mengjiao; Takach, Nicholas; Saasen, Arild; May, Roland

doi:10.1016/j.petrol.2015.12.027

Cited by 22 publications

(6 citation statements)

References 28 publications

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“…Other issues that make the estimation of pressure losses in drilling holes difficult are the eccentricity and the rotational speed of inner drill pipe. Many studies have been done on the flow of non-Newtonian fluids in annuli to introduce empirical/ analytical models which allow to take these effects into account [1,[3][4][5][6][7][8][9][10]. e results of the previous studies show that the annular pressure losses for non-Newtonian (power law) fluids flowing in a drill hole depend on drill pipe rotation speed, fluid properties, flow regimes (laminar/ transitional/turbulent), diameter ratio, eccentricity, and equivalent hydrodynamic roughness.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Sorgun [8] investigated the effect of pipe eccentricity on pressure loss, tangential velocity, axial velocity, and effective viscosity by using CFD. Erge et al [6] presented a CFD modeling approach which is applicable to estimate frictional pressure losses in an eccentric annulus with inner pipe rotation while circulating yield power law fluids. However, most of these CFD studies were limited to the laminar flow of a single phase in hydro dynamically smooth annuli.…”

Section: Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

CFD Analysis of Pressure Losses and Deposition Velocities in Horizontal Annuli

Sultan¹,

Rahman

Rushd

et al. 2019

International Journal of Chemical Engineering

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Estimation of pressure losses and deposition velocities is vital in the hydraulic design of annular drill holes in the petroleum industry. The present study investigates the effects of fluid velocity, fluid type, particle size, particle concentration, drill string rotational speed, and eccentricity on pressure losses and settling conditions using computational fluid dynamics (CFD). Eccentricity of the drill pipe is varied in the range of 0–75%, and it rotates about its own axis at 0–150 rpm. The diameter ratio of the simulated drill hole is 0.56. Experimental data confirmed the validity of current CFD model developed using ANSYS 16.2 platform.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

CFD Analysis of Pressure Losses and Deposition Velocities in Horizontal Annuli

Sultan¹,

Rahman

Rushd

et al. 2019

International Journal of Chemical Engineering

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“…Accordingly, under such conditions, one of the key success factors for drilling operations is equivalent circulation density (ECD) management [5,6]. The working window under dynamic conditions must be accurately estimated regarding ECD in order to avoid the circulation risks associated with the effect of fluid properties on the wellbore walls [7,8].…”

Section: Introductionmentioning

confidence: 99%

Dependence of the Equivalent Circulation Density of Formate Drilling Fluids on the Molecular Mass of the Polymer Reagent

2021

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Construction of offshore gas wells is characterized by increased requirements for both the technological process in general and the technological parameters of drilling fluids in particular. Parameters and properties of the used drilling muds must meet a large number of requirements. The main one is the preservation of the permeability of the reservoirs, in addition to the environmental and technological concerns. At the same time, pressures in the productive formation at offshore fields are often high; the anomaly coefficient is 1.2 and higher. The use of barite in such conditions can lead to contamination of the formation and a decrease in future well flow rates. In this regard, the development and study of the compositions for weighted drilling muds is necessary and relevant. The paper presents investigations on the development of such a composition based on salts of formic acid (formates) and evaluates the effect of the molecular weight of the polymer reagent (partially hydrolyzed polyacrylamide) on the equivalent circulation density of the drilling fluid. The result of the work is a formate-based high-density drilling mud with no barite added. Application of such a mud will preserve the permeability of the productive formation.

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“…Accurate knowledge of the FPL in the well helps to check against formation damage or fluid influx into the well. Oil well DFs are very sensitive to pressure and temperature conditions downhole, this makes fluid rheology an important factor in drilling hydraulics [5] [6]. Hole geometry affects the movement of fluids and rock particles in the well.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Fluid Rheology and Drillstring Eccentricity on Drilling Hydraulics

Kerunwa¹,

Obibuike²,

Duru³

et al. 2021

OJOGas

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Accurate determination of hydraulic parameters such as pressure losses, equivalent circulation density (ECD), etc. plays profound roles in drilling, cementing and other well operations. Hydraulics characterization requires that all factors are considered as the neglect of any could become potential sources of errors that would be detrimental to the overall well operation. Drilling Hydraulics has been extensively treated in the literature. However, these works almost entirely rely on the assumption that the drill string lies perfectly at the center of the annulus-the so-called "concentric annulus". In reality, concentricity is almost never achieved even when centralizers are used. This is because of high well inclination angles and different string geometries. Thus, eccentricity exists in practical oil and gas wells especially horizontal and extended reach wells (ERWs) and must be accounted for. The prevalence of drillstring (DS) eccentricity in the annulus calls for a re-evaluation of existing hydraulic models. This study evaluates the effect of drilling fluid rheology types and DS eccentricity on the entire drilling hydraulics. Three non-Newtonian fluid models were analyzed, viz: Herschel Bulkley, power law and Bingham plastic models. From the results, it was observed that while power law and Bingham plastic models gave the upper and lower hydraulic values, Herschel Bulkley fluid model gave annular pressure loss (APL) and ECD values that fall between the upper and lower values and provide a better fit to the hydraulic data than power law and Bingham plastic fluids. Furthermore, analysis of annular eccentricity reveals that APLs and ECD decrease with an increase in DS eccentricity. Pressure loss reduction of more than 50% was predicted for the fully eccentric case for Herschel Bulkley fluids. Thus, DS eccentricity must be fully considered during well planning and hydraulics designs.

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Equivalent circulating density modeling of Yield Power Law fluids validated with CFD approach

Cited by 22 publications

References 28 publications

CFD Analysis of Pressure Losses and Deposition Velocities in Horizontal Annuli

CFD Analysis of Pressure Losses and Deposition Velocities in Horizontal Annuli

Dependence of the Equivalent Circulation Density of Formate Drilling Fluids on the Molecular Mass of the Polymer Reagent

The Effects of Fluid Rheology and Drillstring Eccentricity on Drilling Hydraulics

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