Physics – Geophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3824404d&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 24, CiteID L24404
Physics
Geophysics
Global Change: General Or Miscellaneous, Hydrology: Groundwater Hydrology, Mathematical Geophysics: Instability Analysis (4312), Physical Properties Of Rocks: Transport Properties
Scientific paper
We report on measurements of the flow pattern and in-situ saturations when n-octane displaces a brine in which surface treated silica nanoparticles are dispersed. The nanoparticles are known to stabilize octane-in-water emulsions. We find that the displacement front is more spatially uniform, and with a later breakthrough when compared to a control displacement with no in-situ nanoparticles. Pressure measurements during the displacement are consistent with generation of a viscous phase such as an emulsion. These observations suggest that a nanoparticle stabilized emulsion is formed during the displacement which acts to suppress the viscous instability. We argue that generation of droplets of nonwetting phase occurs at the leading edge of all drainage displacements. The droplets rejoin the bulk phase in the absence of stabilizing agents, but are preserved when nanoparticles adhere to the fluid/fluid interface.
Aminzadeh B.
Bryant S. L.
Chung Dae H.
Dicarlo David A.
Huh C.
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