Journal
COLLOIDS AND INTERFACES
Volume 6, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/colloids6020033
Keywords
nanofluid; oscillatory structural forces; film stability; wetting; spreading; enhanced oil recovery
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Nanofluids have promising applications in enhanced oil recovery due to their efficient oscillatory structural forces, which promote wetting and spreading on solid surfaces, enhancing oil separation from reservoirs.
Nanofluids have attracted significant research interest for their promising application in enhanced oil recovery. One striking feature leading to the outstanding efficiency of nanofluids in enhanced oil recovery is the structure of nanoparticles, which induces oscillatory structural forces in the confined space between fluid-fluid interfaces or air-liquid and liquid-solid interfaces. To promote the understanding of the oscillatory structural forces and their application in enhanced oil recovery, we reviewed the origin and theory of the oscillatory structural forces, factors affecting their magnitude, and the experimental techniques demonstrating their impacts on enhanced oil recovery. We also reviewed the methods, where the benefits of nanofluids in enhanced oil recovery provided by the oscillatory structural forces are directly manifested. The oscillatory structural forces promote the wetting and spreading of nanofluids on solid surfaces, which ultimately enhances the separation of oil from the reservoir. Some imbibition tests demonstrated as much as 50% increased oil recovery, compared to the cases where the oscillatory structural forces were absent.
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