Investigation of Pressure Losses in Eccentric Inclined Annuli

2017 ◽  
Author(s):  
S. Rushd ◽  
R. A. Sultan ◽  
A. Rahman ◽  
V. Kelessidis
Keyword(s):  
Power Law ◽  
Fluid Velocity ◽  
Petroleum Industry ◽  
Pressure Losses ◽  
Hydraulic Design ◽  
Power Law Fluids ◽  
Hydraulic Conditions ◽  
Drillpipe Rotation ◽  
Extended Reach Drilling ◽  
Fluid Rheology

Accurate pressure drop estimation is vital in the hydraulic design of annular drillholes in Petroleum Industry. The present study investigates the effects of fluid velocity, fluid type, fluid rheology, drillpipe rotation speed, drillpipe eccentricity and drillhole inclinationon on pressure losses with the presence of cuttings using both experiments and computational fluid dynamics (CFD). The eccentricity of the drillpipe is varied in the range of 0 – 100% and it rotates about its own axis at 0 – 150 rpm. The diameter ratio of the simulated drillhole is 0.56 and it is inclined in the range of 0 – 15°. The effects of fluid rheology are addressed by testing power law and yield power law fluids. Both of the laminar and turbulent conditions are experimentally tested and numerically simulated. Experimental data confirmed the validity of current CFD model developed using ANSYS 16.2 platform. The goal of the current work is to develop a comprehensive CFD tool that can be used for modeling the hydraulic conditions associated with hole cleaning in extended reach drilling.

The Effect of Drillpipe Rotation on Annular Frictional Pressure Loss

1998 ◽  
Vol 120 (1) ◽  
pp. 61-66 ◽  
Author(s):  
X. Wei ◽  
S. Z. Miska ◽  
N. E. Takach ◽  
P. Bern ◽  
P. Kenny
Keyword(s):  
Horizontal Wells ◽  
Flow Loop ◽  
Rotary Drilling ◽  
Flow Models ◽  
Pressure Losses ◽  
Power Law Fluids ◽  
Drillpipe Rotation ◽  
Pipe Rotation ◽  
Thinning Effect ◽  
Good Agreement

Accurate predictions of annular frictional pressure losses (AFPL) are important for optimal hydraulic program design of both vertical and horizontal wells. In this study, the effects of drillpipe rotation on AFPL for laminar, helical flow of power law fluids are investigated through theoretical, study, flow models were developed for concentric and eccentric pipe configurations assuming that pipe rotates about its axis. A hybrid-analytical solution is developed for calculating AFPL in eccentric pipe configuration. Computer simulations indicate that the shear-thinning effect induced by pipe rotation results in reduction of AFPL in both concentric and eccentric pipe configurations. The pressure reduction is most significant for concentric pipe configurations. For conventional rotary drilling geometry and pipe rotary speeds, the reduction in AFPL is small. A number of laboratory experiments conducted on the full-scale TUDRP flow loop are generally in good agreement with the results of modeling. Available fileld data, however, consistently show an increase in AFPL. This behavior is explained by pipe lateral movement (swirling), which causes turbulence and eventually an increase in AFPL.

The Effects of Drillstring-Eccentricity, -Rotation, and -Buckling Configurations on Annular Frictional Pressure Losses While Circulating Yield-Power-Law Fluids

2015 ◽  
Vol 30 (03) ◽  
pp. 257-271 ◽  
Author(s):  
Oney Erge ◽  
Evren Mehmet Ozbayoglu ◽  
Stefan Miska ◽  
Mengjiao Yu ◽  
Nicholas Takach ◽  
...  
Keyword(s):  
Power Law ◽  
Pressure Losses ◽  
Power Law Fluids

The Effects of Drillstring Eccentricity, Rotation, and Buckling Configurations on Annular Frictional Pressure Losses While Circulating Yield Power Law Fluids

2014 ◽  
Author(s):  
Oney Erge ◽  
Evren M. Ozbayoglu ◽  
Stefan Z Miska ◽  
Mengjiao Yu ◽  
Nicholas Takach ◽  
...  
Keyword(s):  
Power Law ◽  
Pressure Losses ◽  
Power Law Fluids

The Effect of Drillpipe Rotation on Pressure Losses and Fluid Velocity Profile in Foam Drilling

2008 ◽  
Author(s):  
Mingqin Duan ◽  
Stefan Z. Miska ◽  
Mengjiao Yu ◽  
Nicholas E. Takach ◽  
Ramadan Mohammed Ahmed ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Fluid Velocity ◽  
Pressure Losses ◽  
Drillpipe Rotation ◽  
Foam Drilling

Effect of Drillstring Deflection and Rotary Speed on Annular Frictional Pressure Losses

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Oney Erge ◽  
Mehmet E. Ozbayoglu ◽  
Stefan Z. Miska ◽  
Mengjiao Yu ◽  
Nicholas Takach ◽  
...  
Keyword(s):  
Power Law ◽  
Pressure Loss ◽  
Drilling Fluid ◽  
Hole Drilling ◽  
Accurate Estimation ◽  
Turbulent Friction ◽  
Horizontal Drilling ◽  
Pressure Losses ◽  
Power Law Fluids ◽  
Drilling Operations

Keeping the drilling fluid equivalent circulating density in the operating window between the pore and fracture pressure is a challenge, particularly when the gap between these two is narrow, such as in offshore, extended reach, and slim hole drilling applications usually encountered in shale gas and/or oil drilling. To overcome this challenge, accurate estimation of frictional pressure loss in the annulus is essential. A better estimation of frictional pressure losses will enable improved well control, optimized bit hydraulics, a better drilling fluid program, and pump selection. Field and experimental measurements show that pressure loss in annuli is strongly affected by the pipe rotation and eccentricity. The major focus of this project is on a horizontal well setup with drillstring under compression, considering the influence of rotation on frictional pressure losses of yield power law fluids. The test matrix includes flow through the annulus for various buckling modes with and without the rotation of the inner pipe. Sinusoidal, helical, and transition from sinusoidal to helical configurations with and without the drillstring rotation were investigated. Helical configurations with two different pitch lengths are compared. Eight yield power law fluids are tested and consistent results are observed. The drillstring rotation patterns and buckling can be observed due to experimental facility's relatively longer and transparent test section. At the initial position, inner pipe is lying at the bottom due to its extensive length, suggesting a fully eccentric annular geometry. When the drillstring is rotated, whirling, snaking, irregular motions are observed. This state is considered as a free drillstring configuration since there is no prefixed eccentricity imposed on the drillstring. The reason for such design is to simulate the actual drilling operations, especially the highly inclined and horizontal drilling operations. Results show that rotating the drillstring can either increase or decrease the frictional pressure losses. The most pronounced effect of rotation is observed in the transition region from laminar to turbulent flow. The experiments with the buckled drillstring showed significantly reduced frictional pressure losses compared to the free drillstring configuration. Decreasing the length of the pitch caused a further reduction in pressure losses. Using the experimental database, turbulent friction factors for buckled and rotating drillstrings are presented. The drilling industry has recently been involved in incidents that show the need for critical improvements for evaluating and avoiding risks in oil/gas drilling. The information obtained from this study can be used to improve the control of bottomhole pressures during extended reach, horizontal, managed pressure, offshore, and slim hole drilling applications. This will lead to improved safety and enhanced optimization of drilling operations.

CFD Analysis and Model Comparison of Annular Frictional Pressure Losses While Circulating Yield Power Law Fluids

2015 ◽  
Author(s):  
Oney Erge ◽  
Evren M. Ozbayoglu ◽  
Stefan Z. Miska ◽  
Mengjiao Yu ◽  
Nicholas Takach ◽  
...  
Keyword(s):  
Power Law ◽  
Model Comparison ◽  
Cfd Analysis ◽  
Pressure Losses ◽  
Power Law Fluids

scholarly journals CFD Analysis of Pressure Losses and Deposition Velocities in Horizontal Annuli

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Rasel A. Sultan ◽  
Mohammad Azizur Rahman ◽  
Sayeed Rushd ◽  
Sohrab Zendehboudi ◽  
Vassilios C. Kelessidis
Keyword(s):  
Fluid Velocity ◽  
Drill Pipe ◽  
Petroleum Industry ◽  
Drill Hole ◽  
Drill String ◽  
Pressure Losses ◽  
Deposition Velocities ◽  
Horizontal Annuli ◽  
Type Particle ◽  
Drill Holes

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.

Self-similar rupture of thin films of power-law fluids on a substrate

2017 ◽  
Vol 826 ◽  
pp. 455-483 ◽  
Author(s):  
Vishrut Garg ◽  
Pritish M. Kamat ◽  
Christopher R. Anthony ◽  
Sumeet S. Thete ◽  
Osman A. Basaran
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Power Law ◽  
Fluid Velocity ◽  
Van Der Waals ◽  
Critical Conditions ◽  
Fluid Viscosity ◽  
Lubrication Approximation ◽  
Power Law Fluid ◽  
Power Law Fluids

Thinning and rupture of a thin film of a power-law fluid on a solid substrate under the balance between destabilizing van der Waals pressure and stabilizing capillary pressure is analysed. In a power-law fluid, viscosity is not constant but is proportional to the deformation rate raised to the $n-1$ power, where $0<n\leqslant 1$ is the power-law exponent ($n=1$ for a Newtonian fluid). In the first part of the paper, use is made of the slenderness of the film and the lubrication approximation is applied to the equations of motion to derive a spatially one-dimensional nonlinear evolution equation for film thickness. The variation with time remaining until rupture of the film thickness, the lateral length scale, fluid velocity and viscosity is determined analytically and confirmed by numerical simulations for both line rupture and point rupture. The self-similarity of the numerically computed film profiles in the vicinity of the location where the film thickness is a minimum is demonstrated by rescaling of the transient profiles with the scales deduced from theory. It is then shown that, in contrast to films of Newtonian fluids undergoing rupture for which inertia is always negligible, inertia can become important during thinning of films of power-law fluids in certain situations. The critical conditions for which inertia becomes important and the lubrication approximation is no longer valid are determined analytically. In the second part of the paper, thinning and rupture of thin films of power-law fluids in situations when inertia is important are simulated by solving numerically the spatially two-dimensional, transient Cauchy momentum and continuity equations. It is shown that as such films continue to thin, a change of scaling occurs from a regime in which van der Waals, capillary and viscous forces are important to one where the dominant balance of forces is between van der Waals, capillary and inertial forces while viscous force is negligible.

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