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Nanofluid of graphene-based amphiphilic Janus nanosheets for tertiary or enhanced oil recovery
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Nanofluid of graphene-based amphiphilic Janus nanosheets for tertiary or enhanced oil recovery
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Journal Article
Nanofluid of graphene-based amphiphilic Janus nanosheets for tertiary or enhanced oil recovery
2016
Overview
The current simple nanofluid flooding method for tertiary or enhanced oil recovery is inefficient, especially when used with low nanoparticle concentration. We have designed and produced a nanofluid of graphene-based amphiphilic nanosheets that is very effective at low concentration. Our nanosheets spontaneously approached the oil–water interface and reduced the interfacial tension in a saline environment (4 wt % NaCl and 1 wt % CaCl₂), regardless of the solid surface wettability. A climbing film appeared and grew at moderate hydrodynamic condition to encapsulate the oil phase. With strong hydrodynamic power input, a solid-like interfacial film formed and was able to return to its original form even after being seriously disturbed. The film rapidly separated oil and water phases for slug-like oil displacement. The unique behavior of our nanosheet nanofluid tripled the best performance of conventional nanofluid flooding methods under similar conditions.
Publisher
National Academy of Sciences,Proceedings of the National Academy of Sciences
