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Nano-scale structure of crude oil deposits on water-wet substrates: Dependence on aqueous phase and organic solvents

Lebedeva, Evgenia; Fogden, Andrew

Description

Wettability alteration of glass substrates due to displacement of the surrounding salt solution by crude oil, and its reversal via salt solution flooding, were investigated as a function of salt concentration and solution pH, and the sample preparation procedure. The resulting wettability states were analyzed by microscopy of the substrate-bound oil residues and contact angle goniometry. Atomic force microscopy of the flooded state under its salt solution showed partial coverage of the...[Show more]

dc.contributor.authorLebedeva, Evgenia
dc.contributor.authorFogden, Andrew
dc.date.accessioned2015-12-10T22:53:31Z
dc.identifier.issn0927-7757
dc.identifier.urihttp://hdl.handle.net/1885/59379
dc.description.abstractWettability alteration of glass substrates due to displacement of the surrounding salt solution by crude oil, and its reversal via salt solution flooding, were investigated as a function of salt concentration and solution pH, and the sample preparation procedure. The resulting wettability states were analyzed by microscopy of the substrate-bound oil residues and contact angle goniometry. Atomic force microscopy of the flooded state under its salt solution showed partial coverage of the substrate by adhering oil nano-blobs. Scanning electron microscopy provides a simpler means to acquire images of residues, but the need to rinse the bulk liquids and dry can introduce preparation artifacts. Three organic solvent rinsing procedures were examined, all showing that oil residue coverage decreases with increasing NaCl concentration and pH, and also decreases after flooding to follow these same trends. However, procedures in which bulk oil was rinsed from the flooded state using the solvents decalin and heptane created extraneous deposition; removal of the salt solution by methanol better preserved the oil residues. After flooding, even the salt solution allowing greatest adsorption/deposition of polar oil components, and strongest oil-substrate adhesion, had reduced coverage to only 20%. Analogous experiments on sandstone rock supported these findings. This suggests that local wettability of reservoirs can fluctuate in response to the oil and water slowly passing through pores during oil recovery by flooding.
dc.publisherElsevier
dc.sourceColloids and Surfaces A: Physicochemical and Engineering Aspects
dc.subjectKeywords: Aqueous phase; Bulk liquid; Contact angle goniometry; Decalin; Glass substrates; NaCl concentration; Nanoscale structure; Oil components; Oil deposits; Oil recoveries; Oil residues; Partial coverage; Salt concentration; Salt solution; Sample preparation p Adsorption; Contact angle; Crude oil; Glass; Morphology; Wettability
dc.titleNano-scale structure of crude oil deposits on water-wet substrates: Dependence on aqueous phase and organic solvents
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume380
dc.date.issued2011
local.identifier.absfor020402 - Condensed Matter Imaging
local.identifier.absfor030603 - Colloid and Surface Chemistry
local.identifier.absfor091406 - Petroleum and Reservoir Engineering
local.identifier.ariespublicationu9210271xPUB487
local.type.statusPublished Version
local.contributor.affiliationLebedeva, Evgenia, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFogden, Andrew, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue1-3
local.bibliographicCitation.startpage280
local.bibliographicCitation.lastpage291
local.identifier.doi10.1016/j.colsurfa.2011.02.053
dc.date.updated2016-02-24T11:56:08Z
local.identifier.scopusID2-s2.0-79954418917
local.identifier.thomsonID000290888800039
CollectionsANU Research Publications

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