scholarly journals Effect of Yield Power Law Fluid Rheological Properties on Cuttings Transport in Eccentric Horizontal Narrow Annulus

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Titus Ntow Ofei
Keyword(s):  
Rheological Properties ◽  
Power Law ◽  
Fluid Model ◽  
Drilling Fluid ◽  
Flow Behavior ◽  
Annular Region ◽  
Cuttings Transport ◽  
Power Law Fluid ◽  
Gas Drilling ◽  
Transport Velocity

Narrow annular drilling such as casing-while-drilling technique is gaining popularity due to its ability to mitigate nonproductive time during oil and gas drilling operations. However, very little is known about the flow dynamics in narrow annular drilling. In this study, the Eulerian-Eulerian two-fluid model was used to examine the influence of Yield Power Law fluid rheological properties on cuttings transport in eccentric horizontal narrow annulus. The flow was assumed as fully developed, laminar, and transient state. The present simulation model was validated against experimental data, where a mean percent error of −1.2% was recorded. Results revealed an increase in the radial distribution of cuttings transport velocity in the wide annular region as the consistency index, K, and the flow behavior index, n, increase. Nonetheless, increasing the yield stress, τo, had insignificant effect on the cuttings transport velocity. Three-dimensional profiles showed how cuttings preferred to travel in less resistant flow area, whereas cuttings concentration builds up in the narrow annular region. Furthermore, annular frictional pressure losses also increased as K, n, and τo increased. This study serves as a guide to properly optimize drilling fluid rheological properties for efficient cuttings transport and equivalent circulating density (ECD) management in narrow annular drilling.

Numerical and Experimental Study on the Effects of Rheological Behavior of Drilling Fluid on the Performance of the Fluidic Down-the-Hole Hammer

1900 ◽  
pp. 1-13
Author(s):  
Dong Ge ◽  
Jianming Peng ◽  
Guang Zhang ◽  
Jingqing Cheng ◽  
Pengyu Zhang ◽  
...  
Keyword(s):  
Power Law ◽  
Flow Rate ◽  
Performance Prediction ◽  
Rheological Behavior ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Flow Behavior ◽  
Drilling Mud ◽  
Power Law Fluid ◽  
Oil And Gas Exploration

Summary In the field of oil and gas exploration, the fluidic down-the-hole (DTH) hammer has frequently been used to solve the challenges associated with hard rock drilling and excessive friction along the drillstring. Appropriate performance prediction for drilling tools is particularly important for the drilling operation. Previous experiments showed that the performance prediction scheme determined by the water was not accurate for fluidic DTH hammer driven by mud, which is a typical pseudoplastic power-law fluid. Based on the results, compared with water, the rheological behavior of the pseudoplastic power-law fluid can be significant for the flow behavior in the fluidic oscillator with a lower supply flow rate. However, for a normal or higher level of supply flow rate, because of the shear diluting effect of the pseudoplastic power-law fluid, the influence of rheology behavior of drilling mud on the performance of fluidic DTH hammer was not apparent. The temperature of the drilling fluid and barite weighting agent can also affect the performance of the fluidic DTH hammer by affecting the rheological properties of the drilling mud. In this paper, numerical simulation and experiments are used for qualitative discussion and conclusion verification, respectively.

scholarly journals Viscosity Estimation of a Suspension with Rigid Spheres in Circular Microchannels Using Particle Tracking Velocimetry

Micromachines ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 675 ◽  
Author(s):  
Kawaguchi ◽  
Fukui ◽  
Funamoto ◽  
Tanaka ◽  
Tanaka ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Power Law ◽  
Particle Tracking ◽  
Particle Tracking Velocimetry ◽  
Colloidal Particles ◽  
Fluid Model ◽  
Relative Viscosity ◽  
Circular Cross Section ◽  
Rigid Spheres ◽  
Power Law Index

Suspension flows are ubiquitous in industry and nature. Therefore, it is important to understand the rheological properties of a suspension. The key to understanding the mechanism of suspension rheology is considering changes in its microstructure. It is difficult to evaluate the influence of change in the microstructure on the rheological properties affected by the macroscopic flow field for non-colloidal particles. In this study, we propose a new method to evaluate the changes in both the microstructure and rheological properties of a suspension using particle tracking velocimetry (PTV) and a power-law fluid model. Dilute suspension (0.38%) flows with fluorescent particles in a microchannel with a circular cross section were measured under low Reynolds number conditions (Re ≈ 10−4). Furthermore, the distribution of suspended particles in the radial direction was obtained from the measured images. Based on the power-law index and dependence of relative viscosity on the shear rate, we observed that the non-Newtonian properties of the suspension showed shear-thinning. This method will be useful in revealing the relationship between microstructural changes in a suspension and its rheology.

The Equation of the Limit Replacement Width of Non-Newton Fluid in Eccentric Annulus

2013 ◽  
Vol 807-809 ◽  
pp. 2616-2619
Author(s):  
Yin Qing Liu ◽  
Mei Wei Wang ◽  
Hai Qing Cui
Keyword(s):  
Numerical Solution ◽  
Rheological Properties ◽  
Power Law ◽  
Solution Method ◽  
Cement Slurry ◽  
Power Law Fluid ◽  
Two Phase ◽  
Numerical Solution Method ◽  
Eccentric Annulus ◽  
The One

The equation of the limit replacement width of the one-dimension two-phase flow of Bingham fluid replacing Power law fluid in eccentric annulus was established, the numerical solution method of the equation mentioned above was given and taking the 3 wells, such as the He 104-27 well etc for examples, the limit replacement widths of cement slurry displacing mud, whose rheological properties can be described as Bingham and Power law modles respectively, were calculated, by using the equation and the numerical solution method mentioned above, and compared with those of cement slurry displacing mud, whose rheological properties are all described as Binghanm modle.

Rheological Properties and Microstructure of Hypereutectic Semi-Solid Al-Si-Mg Alloys Using Rheocasting Route

2012 ◽  
Vol 192-193 ◽  
pp. 323-328 ◽  
Author(s):  
Mehand Tebib ◽  
Frank Ajersch ◽  
X. Grant Chen
Keyword(s):  
Solid State ◽  
Rheological Properties ◽  
Parallel Plate ◽  
Fluid Model ◽  
Flow Behavior ◽  
Microstructural Study ◽  
Shear Rates ◽  
Solid Phases ◽  
Semi Solid ◽  
Liquid And Solid Phases

The SEED rheocasting process was used to produce semi-solid slurries of hypereutectic Al-17Si-4.5Cu (A390) and Al-15Si-10.5Mg-4Cu alloys respectively. The rheological properties of these alloys in the semi-solid state were characterized at different deformation rates and at variable solid fractions using the parallel plate compression viscometry. The viscosity at different shear rates was calculated using a Newtonian fluid model for increments of deformation during compression. Microstructures of both alloys, after partial solidification and compression, were examined in order to characterize the flow behavior during deformation. The comparison of the viscosity between the A390 and Al-15Si-10.5Mg-4Cu alloys indicated that the high Mg containing alloy possessed a higher viscosity for the range of shear rates and solid fractions investigated. Rheological results showed that at a given solid fraction, the viscosity of both alloys decreased significantly with increasing shear rates, indicating a shear thinning behavior. In addition, a separation of liquid and solid phases was also observed for both alloys in the microstructural study of compressed semi-solid billets.

Rheological Properties of Chocolate Drink from Cupuassu

2008 ◽  
Vol 4 (1) ◽  
Author(s):  
Suzana Caetano da Silva Lannes ◽  
Magda Leite Medeiros
Keyword(s):  
Rheological Properties ◽  
Power Law ◽  
Microcrystalline Cellulose ◽  
Flow Behavior ◽  
Chocolate Milk ◽  
Spray Dryer ◽  
Rheological Models ◽  
Bingham Plastic ◽  
Theobroma Grandiflorum ◽  
Lower Viscosity

Flow behavior of chocolate drinks from Cupuassu (Theobroma grandiflorum, Sterculiaceae) from instantised and normal formulation, and enriched with calcium, were studied. Flow behavior was described using common rheological models (Newton, Power Law, and Bingham plastic). Experimental results, obtained at 25 oC and 40oC, fitted mostly the Ostwald and Bingham models, with R2 ? 0.997. The Newtonian model has 0.886 ? R2 ? 0.991. At 25 oC, as expected, viscosity of samples was higher and pseudoplasticity increased (n values were lower than 1). The spray-dryer process lead to differences of rheology of the ``chocolate'' milk drinks. The addition of microcrystalline cellulose plus calcium leads to a lower viscosity.

scholarly journals Analysis of Blood Flow in Arterial Stenosis Using Casson and Power-Law Fluid Model

2013 ◽  
Vol 14 (2) ◽  
pp. 73
Author(s):  
Riri Jonuarti
Keyword(s):  
Blood Flow ◽  
Power Law ◽  
Fluid Model ◽  
Blood Flow Rate ◽  
Casson Fluid ◽  
Arterial Stenosis ◽  
Fluid Models ◽  
Power Law Fluid ◽  
Pass Through ◽  
Flow Power

Simulation of blood flow behaviour in the arteries and in arterial stenosis has been made and will be discussed in this paper. This simulation uses pulsatile flow and blood flow in artery without stenosis is considered as a dynamic fluid, compressed and condensed. Whereas, in the case of arterial stenosis has been used Casson and Power-law fluid models. In the arteries without stenosis, blood flow velocity profiles show the same pattern for each Womersley number, but with different speed value. In the case of arterial stenosis, blood flow rate decreases with increasing stenosis position away from axis of blood vessels. Resistances to flow are increases with increasing the size (height and length) of stenosis, both for the Casson and Power-law fluid models. If resistance to flow increases, it is more difficult for the blood to pass through an artery, result the flow decreases and heart has to work harder to maintain adequate circulation.Keywords : Artery, blood flow, power-law fluid, Casson fluid, stenosis  

Power law fluid model for blood flow through a tapered artery with a stenosis

2011 ◽  
Vol 217 (17) ◽  
pp. 7108-7116 ◽  
Author(s):  
S. Nadeem ◽  
Noreen Sher Akbar ◽  
Awatif A. Hendi ◽  
T. Hayat
Keyword(s):  
Blood Flow ◽  
Power Law ◽  
Fluid Model ◽  
Power Law Fluid ◽  
Tapered Artery ◽  
Flow Through

The Rheological Properties of Turkish Delight

2009 ◽  
Vol 6 (1) ◽  
Author(s):  
Zurriye Yilmaz ◽  
Mehmet Dogan ◽  
Mahir Alkan ◽  
Serap Dogan
Keyword(s):  
Shear Rate ◽  
Rheological Properties ◽  
Power Law ◽  
Food Industry ◽  
Arrhenius Equation ◽  
Flow Behavior ◽  
Effect Of Temperature ◽  
Flow Properties ◽  
Different Temperatures ◽  
Dependent Flow

In the food industry, rheological properties, such as viscosity, shear rate, and shear stress, are the most important parameters required in the design of a technological process. Therefore, in this study, we determined the flow behavior and the time-dependent flow properties of Turkish Delight (TD) in the temperature range of 25-75°C using a capillar rheometer. The structure and thermal properties of TD were investigated by XRD and a simultaneous DTA/TG analysis. The shear rate values ranged from 5 to 300s-1. We found that: (i) TD behaved as non- Newtonian pseudoplastic foodstuff; (ii) while the measurement temperature increased, viscosity decreased; and (iii) TD was a rheopectic material. The effect of temperature on viscosity was described by means of the Arrhenius equation. The activation energies for the flow of pseudoplastic TD varied from 50.1-74.2 kJ/mol, depending on shear rate. Three models were used to predict the flow behavior of TD, namely, the Power law, Bingham and Casson models. The Power law model adequately described well the flow behavior of TD at different temperatures.

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