Flow of drilling fluids in eccentric annuli

The effect of pipe eccentricity on the flow of well bore fluids in annuli is investigated both analytically and experimentally. The expression for azimuthal velocity as a function of the eccentricity ratio and rheological parameters of the fluid was obtained analytically using a linear fluidity mode...

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Bibliographic Details
Published in:Journal of non-Newtonian fluid mechanics 1998-08, Vol.78 (2), p.119-132
Main Authors: Siginer, Dennis A., Bakhtiyarov, Sayavur I.
Format: Article
Language:English
Subjects:
Applied sciences
Azimuthal velocity
Crude oil, natural gas and petroleum products
Drilling fluids
Drilling. Casing. Preparing wells for production
Eccentric annuli
Energy
Exact sciences and technology
Fuels
Prospecting and production of crude oil, natural gas, oil shales and tar sands
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Summary:The effect of pipe eccentricity on the flow of well bore fluids in annuli is investigated both analytically and experimentally. The expression for azimuthal velocity as a function of the eccentricity ratio and rheological parameters of the fluid was obtained analytically using a linear fluidity model. Velocity profiles were measured for a Newtonian glycerol/water mixture and a non-Newtonian oil field spacer fluid in eccentric annuli using the stroboscopic flow visualization method. Measured velocity profiles in the eccentric annulus compare well to analytical predictions.
ISSN:0377-0257
1873-2631
DOI:10.1016/S0377-0257(97)00101-8