Rheological Behaviors of Crude Oil inthe Presenceof Water

The rheological properties oflight crude oil andits mixture with water were investigated experimentally. These rheological properties include steady flow behavior, yield stress,
transient flow behavior, and viscoelasticbehavior.A RheoStress RS600 rheometer was employedin all ofthe rheological examination tests.The light crude oil exhibitsa Newtonian and for emulsion exhibitsa non-Newtonian shear thinning behavior over the examined
shear raterange of0.1–120 s-1. In first time, a series ofsamples of crude oil fromthe Algerian Sahara has beentested and the results expressed in terms of τ=f(γ) have demonstratedtheir Newtonian character for the temperature includedin [20°C, 70°C]. In second
timeand at T=20°C, theoil-water emulsions (30%, 50% and 70%) by volumeofwater), thermodynamicallystable, have demonstrated a non-Newtonian rheological behavior that is tosay,Herschel-Bulkley and Binghamtypes. For each typeofcrude oil-water emulsion, the
rheological parameters are calculated bynumerical treatment of results.