1 research outputs found
Model Water-in-Oil Emulsions for Gas Hydrate Studies in Oil Continuous Systems
Stable
water-in-oil emulsions with water volume fraction ranging
from 10 to 70 vol % have been developed with mineral oil 70T, Span
80, sodium di-2-ethylhexylsulfosuccinate (AOT), and water. The mean
size of the water droplets ranges from 2 to 3 μm. Tests conducted
show that all emulsions are stable against coalescence for at least
1 week at 2 °C and room temperature. Furthermore, it was observed
that the viscosity of the emulsion increases with increasing water
volume fraction, with shear thinning behavior observed above certain
water volume fraction emulsions (30 vol % at room temperature and
20 vol % at 1 °C). Viscosity tests performed at different times
after emulsion preparation confirm that the emulsions are stable for
1 week. Differential scanning calorimetry performed on the emulsions
shows that, for low water volume fraction emulsions (<50 vol %),
the emulsions are stable upon ice and hydrate formation. Micromechanical
force (MMF) measurements show that the presence of the surfactant
mixture has little to no effect on the cohesion force between cyclopentane
hydrate particles, although a change in the morphology of the particle
was observed when the surfactant mixture was added into the system.
High-pressure autoclave experiments conducted on the model emulsion
resulted in a loose hydrate slurry when the surfactant mixture was
present in the system. Tests performed in this study show that the
proposed model emulsion is stable, having similar characteristics
to those observed in crude oil emulsions, and may be suitable for
other hydrate studies