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New insights into the interactions between asphaltene and a low surface energy anionic surfactant under low and high brine salinity / Sajad Kiani; Daniel Raymond Jones; Shirin Alexander; Andrew Barron; Daniel Jones

Journal of Colloid and Interface Science

Swansea University Authors: Daniel Raymond, Jones, Shirin, Alexander, Andrew, Barron, Daniel, Jones

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Abstract

Hypothesis: The hyperbranched chains on the tail of low surface energy surfactants (LSES) causes lowering of surface free energy and rock wettability alteration, offering significant improvement in oil recovery in asphaltene oil reservoirs.Experiments: Oil sweep efficiency was determined by fluid di...

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Published in: Journal of Colloid and Interface Science
ISSN: 0021-9797
Published: Elsevier BV 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa53811
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Abstract: Hypothesis: The hyperbranched chains on the tail of low surface energy surfactants (LSES) causes lowering of surface free energy and rock wettability alteration, offering significant improvement in oil recovery in asphaltene oil reservoirs.Experiments: Oil sweep efficiency was determined by fluid displacement in pure brine and LSES-brine solutions in a microfluidic pattern that was representative of a sandstone cross-section. Interfacial tension (IFT), wettability alteration, and Raman and X-ray photoelectron spectroscopy (XPS) were used to measure the changes of asphaltene interactions with oil-aged substrate after surface treating with brine and surfactant-brine solutions.Findings: The hyperbranched LSES yielded a significant increase in the original-oil-in-place (OOIP) recovery (58%) relative to brine flooding (25%), even in the presence of asphaltene. Raman spectra showed the LSES-brine solutions to be capable of causing change to the asphaltene aggregate size after centrifugation treatment.
Keywords: hyper branched surfactants; wettability alteration; asphaltene; enhanced oil recovery