The viscosity of a compressed Nigerian bitumen was measured over a temperature range of 85°C to 150°C. It was found that the viscosity at 85°C and atmospheric pressure, increased from 1894mPas to 2787mPas at 7MPa. At the temperature of 150°C, the viscosity increased from 65mPas (at atmospheric pressure) to 71mPas at 7MPa. Water-in-oil and oil-in-water emulsions were formed in a microreactor. The viscosity of original oil at 60°C and shear rate of 0.14s−1 increased from 34,535mPas to 46,130, 59,867, and 71,912mPas due to the formation of water-in-oil emulsions containing 15%, 35% and 55% w/w water dispersed in the oil phase, respectively. On the other hand, the viscosity at the same condition was found to have decreased to 239.9mPas and 1260mPas as a result of 55% and 70% w/w oil particle dispersed in the alcoholic-caustic solution containing hydrophilic polymeric surfactant. The flow activation energy Ea decreased with increasing water fraction (increased viscosity) for W/O emulsions and increased with increasing water fraction (decrease in viscosity) for O/W emulsions. Moreover, viscosity prediction models have been developed and verified using the experimental data.
Journal of Petroleum Science and Engineering – Elsevier
Published: Sep 1, 2016
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