Effect of individual ions on rock-brine-oil interactions: A microcalorimetric approach

Understanding the mechanisms behind the additional oil recovery by low salinity water flooding (LSWF) in carbonates has been difficult because of the complexity of the crude oil + brine + rock system. This study is an attempt to isolate fluid–fluid and rock-fluid interactions through Isothermal Titr...

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Published in:Fuel (Guildford) 2021-04, Vol.290, p.119955, Article 119955
Main Authors: Cobos, Jacquelin E., Søgaard, Erik G.
Format: Article
Language:English
Subjects:
Brines
Calcite
Calcium
Calcium ions
Calorimetry
Carbonates
Chalk
Crude oil
Flooding
Fluid–fluid interactions
Low salinity
Magnesium
Mixture of ions
Oil
Oil recovery
Rock-fluid
Rocks
Single ions
Titration
Titration calorimetry
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description Understanding the mechanisms behind the additional oil recovery by low salinity water flooding (LSWF) in carbonates has been difficult because of the complexity of the crude oil + brine + rock system. This study is an attempt to isolate fluid–fluid and rock-fluid interactions through Isothermal Titration Calorimetry (ITC) to get a deeper understanding of the oil recovery process. The results from the fluid–fluid interactions pointed out that the observed endothermic response is determined by the formation of micro-dispersions, in which Mg2+ is more active than Ca2+. The incorporation of Ca2+, Mg2+, SO42- and HCO3- onto the chalk lattice effectively does not need energy from the surroundings to proceed. On the other hand, the incorporation of Mg2+ or Ca2+ into the calcite structure in the presence of SO42- is less energetically favorable due to pair creation.
doi_str_mv 10.1016/j.fuel.2020.119955
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source ScienceDirect Freedom Collection
subjects Brines
Calcite
Calcium
Calcium ions
Calorimetry
Carbonates
Chalk
Crude oil
Flooding
Fluid–fluid interactions
Low salinity
Magnesium
Mixture of ions
Oil
Oil recovery
Rock-fluid
Rocks
Single ions
Titration
Titration calorimetry
title Effect of individual ions on rock-brine-oil interactions: A microcalorimetric approach
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