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Cyril Chaudemanche, Isabelle Henaut, Jean-Francois Argillier
Combined effect of pressure and temperature on rheological properties of water-in-crude oil emulsions
Appl. Rheol. 19:6 (2009) 62210 (8 pages)
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The rheological behavior of emulsions has been extensively investigated through experiments made at atmospheric pressure.
This study presents a new experimental characterization of these fluids with measurements performed under pressure
and in a large range of temperature.The results show that viscosities obey Barus model that predicts an exponential increase
with pressure. The extent of the increase is governed by a unique piezoviscous coefficient. This coefficient exhibits a non
monotonous variation with temperature. It has been shown that its thermal dependence and its value can be related to the
viscoelastic properties of the fluid. The coefficient is an increasing function of temperature for a solid-like behaviour and a
decreasing function of temperature for a liquid-like behaviour.This approach has been applied to heavy crude oils. It has been
demonstrated that water droplets and oil composition modify the elastic character of heavy crude oils and as a consequence
they modify their piezoviscosity.
► Cite this publication as follows:
Chaudemanche C, Henaut I, Argillier J: Combined effect of pressure and temperature on rheological properties of water-in-crude oil emulsions, Appl. Rheol. 19 (2009) 62210.
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