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Research Papers: Petroleum Wells-Drilling/Production/Construction

Modeling and Experimental Study of Newtonian Fluid Flow in Annulus

[+] Author and Article Information
Mehmet Sorgun

Department of Petroleum and Natural Gas Engineering, Middle East Technical University, Inonu Bulvari Ankara, 06531 Turkeymehmetsorgun@gmail.com

M. Evren Ozbayoglu

Department of Petroleum Engineering, University of Tulsa, 800 South Tucker Drive, Tulsa, OK 74104

Ismail Aydin

Department of Civil Engineering, Middle East Technical University, Inonu Bulvari Ankara, 06531 Turkey

J. Energy Resour. Technol 132(3), 033102 (Sep 29, 2010) (6 pages) doi:10.1115/1.4002243 History: Received May 11, 2009; Revised July 19, 2010; Published September 29, 2010; Online September 29, 2010

A major concern in drilling operations is the proper determination of frictional pressure loss in order to select a mud pump and avoid any serious problems. In this study, a mechanistic model is proposed for predicting the frictional pressure losses of light drilling fluid, which can be used for concentric annuli. The experimental data that were available in the literature and conducted at the Middle East Technical University-Petroleum Engineering (METU-PETE) flow loop as well as computational fluid dynamics (CFD) software are used to verify the results from the proposed mechanistic model. The results showed that the proposed model can estimate frictional pressure losses within a ±10% error interval when compared with the experimental data. Additionally, the effect of the pipe eccentricity on frictional pressure loss and tangential velocity using CFD for laminar and turbulent flow is also examined. It has been observed that pipe eccentricity drastically increases the tangential velocity inside the annulus; especially, the flow regime is turbulent and frictional pressure loss decreases as the pipe eccentricity increases.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Slot equivalent of concentric annuli (11)

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Figure 2

Discrete domain by using finite difference technique

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Figure 3

Middle East Technical University, Petroleum and Natural Gas Engineering, flow loop

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Figure 4

Tetrahedral meshing sample (fully eccentric annulus)

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Figure 5

Comparison of METU experimental and calculated pressure gradient values for low flow rates

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Figure 6

Comparison of METU experimental and calculated pressure gradient values for high flow rates

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Figure 7

Comparison of the proposed model and McCann experimental pressure gradient values in concentric annuli

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Figure 8

Comparison of experimental and calculated pressure gradient values for concentric annulus

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Figure 9

Pressure gradient values in concentric and fully eccentric annuli (2.9 in.×1.8) using CFD model, laminar flow

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Figure 10

Pressure gradient values in concentric and fully eccentric annuli (2.9 in.×1.8) using CFD model, turbulent flow

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Figure 11

Averaged tangential velocity distribution for concentric and fully eccentric annuli (2.9 in.×1.8) using CFD model, laminar flow

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Figure 12

Averaged tangential velocity distribution for concentric and fully eccentric annuli (2.9 in.×1.8) using CFD model, turbulent flow

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