Abstract
To have a better knowledge of problems occurring with drilling fluids in complex wells, we carried out a detailed rheological analysis of a typical drilling mud at low shear rates using both conventional rheometry and MRI velocimetry. We show the existence of a viscosity bifurcation effect: Below a critical stress value, the mud tends to completely stop flowing, whereas beyond this critical stress, it reaches an apparent shear rate larger than a finite (critical) value, and no stable flows can be obtained between this critical shear rate value and zero. These results are confirmed by MRI velocity profiles, which exhibit a slope break at the interface between the solid and the liquid phases inside the Couette geometry. Moreover, this viscosity bifurcation is a transient phenomenon, the progressive development of which can be observed by MRI. A further examination of MRI data shows that, in the transient regime, the shear rate does not vary monotonously in the rheometer gap and is particularly large along the outer (rough) cylinder, which might be at the origin of the development of a region of constant shear rate in the apparent flow curve.
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References
Aldea C, Growcock FB, Lee LJ, Friedheim JE, van Oort E (2001) Prevention of dynamic sag in deepwater invert emulsion fluids. AADE 01-NC-HO-51. AADE National Drilling Technical Conference, Houston, 27–29 March 2001
Aveyrard R, Binks BP, Clint JH (2003) Emulsions stabilized solely by colloidal particles. Adv Colloid Interface Sci 100:503
Barnes HA (1994) Rheology of emulsions—A review. Colloids Surf A Physicochem Eng Asp 91:89–95
Baudez JC, Rodts S, Chateau X, Coussot P (2004) A new technique for reconstructing instantaneous velocity profiles from viscometric tests: application to pasty materials. J Rheol 48:69–82
Bécu L, Grondin P, Colin A, Manneville S (2005) How does a concentrated emulsion flow? Yielding, local rheology, and wall slip. Colloids Surf A Physicochem Eng Asp 263:146–152
Bern PAC, Zamora M, Slater K, Hearn PJ (1996) The influence of drilling variables on barite sag, SPE 36670. In: SPE Annual Technical Conference and Exhibition, pp 887–894
Bern PA, Van Oort E, Neusstadt B, Ebeltoft H, Zurdo C, Zamora M, Slater K (2000) Barite sag: measurement, modelling and management. SPE 47784. SPE/IADC Asia Pacific Drilling Technology Conference, Kuala Lumpur, 11–13 September 2000
Bertola V, Bertrand F, Tabuteau H, Bonn D, Coussot P (2003) Wall slip and yielding in pasty materials. J Rheol 47:1211–1226
Binks BP (2002) Particles as surfactants — similarities and differences. Curr Opin Colloid Interface Sci 7:21–41
Coleman BD, Markowitz H, Noll W (1966) Viscometric flows of non-Newtonian fluids. Springer, Berlin Heidelberg New York
Coussot P (1997) Mudflow rheology and dynamics. Balkema, Rotterdam
Coussot P (2005) Rheometry of pastes, suspensions, and granular materials. Wiley, New York
Coussot P, Nguyen QD, Huynh HT, Bonn D (2002a) Viscosity bifurcation in thixotropic, yielding fluids. J Rheol 46:573
Coussot P, Raynaud JS, Bertrand F, Moucheront P, Guilbaud JP, Huynh HT, Jarny S, Lesueur D (2002b) Coexistence of liquid and solid phases in flowing soft–glassy materials. Phys Rev Lett 88:218301
Coussot P, Nguyen QD, Huynh HT, Bonn D (2002c) Avalanche behavior in yield stress fluids. Phys Rev Lett 88:175501
Dye W, Hemphill T, Gusler W, Mullen G (1999) Correlation of ultra-low shear rate viscosity and dynamic barite sag in invert emulsion drilling fluids. SPE 56636. SPE Annual Technical Conference and Exhibition, Houston, 3–6 October 1999
Hanlon AD, Gibbs SJ, Hall LD, Haycock DE, Frith WJ, Ablett S (1998) Rapid MRI and velocimetry of cylindrical Couette flow. Magn Reson Imaging 16:953–961
Herzhaft B, Rousseau L, Néau L, Moan M, Bossard F (2003) Influence of temperature and clays/emulsion microstructure on oil-based mud low shear rate rheology. SPE J 8:211
Hollingsworth KG, Johns ML (2004) Rheo-nuclear magnetic resonance of emulsion systems. J Rheol 48:787–803
Jarny S, Coussot P (2002) Characterization of pasty flows in a Couette geometry. Rhéologie 2:52–63 (in French)
Mason TG (1999) New fundamental concept in emulsion rheology. Curr Opin Colloid Interface Sci 4:231–238
Mason TG, Bibette J, Weitz DA (1996) Yielding and flow of monodisperse emulsions. J Colloid Interface Sci 179:439–448
Raynaud JS, Moucheront P, Baudez JC, Bertrand F, Guilbaud JP, Coussot P (2002) Direct determination by nuclear magnetic resonance of the thixotropic and yielding behavior of suspensions. J Rheol 46:709–732
Roussel N, Le Roy R, Coussot P (2004) Thixotropic modelling at local and macroscopic scales. J Non-Newton Fluid Mech 117:85–95
Skalle P, Backe KR, Lyomov SK, Sveen J (1999) Barite segregation in inclined boreholes. J Can Pet Technol (special edition) 38, Paper number 97–76
Yan N, Gray MR, Masliyah JH (2001) On water-in-oil emulsions stabilized by fine solids. Colloids Surf A Physicochem Eng Asp 193:97–107
Acknowledgements
A. Ragouilliaux, F. Bertrand, and P. Coussot work in Laboratoire des Matériaux et des Structures du Génie Civil, which is a lab depending on Laboratoire Central des Ponts et Chaussées, Ecole des Ponts, and Centre National de la Recherche Scientifique, and is a division of Institut Navier. The authors want to thank G. Ovarlez, N. Bonn, and T. Palermo for fruitful discussions.
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Ragouilliaux, A., Herzhaft, B., Bertrand, F. et al. Flow instability and shear localization in a drilling mud. Rheol Acta 46, 261–271 (2006). https://doi.org/10.1007/s00397-006-0114-2
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DOI: https://doi.org/10.1007/s00397-006-0114-2