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Reservoir-condition pore-scale imaging of dolomite reaction with supercritical CO2acidified brine: Effect of pore-structure on reaction rate using velocity distribution analysis

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Title: Reservoir-condition pore-scale imaging of dolomite reaction with supercritical CO<inf>2</inf>acidified brine: Effect of pore-structure on reaction rate using velocity distribution analysis
Authors: Al-Khulaifi, Y
Lin, Q
Blunt, MJ
Bijeljic, B
Item Type: Journal Article
Abstract: To investigate the impact of rock heterogeneity and flowrate on reaction rates and dissolution dynamics, four millimetre-scale Silurian dolomite samples were pre-screened based on their physical heterogeneity, defined by the simulated velocity distributions characterising each flow field. Two pairs of cores with similar heterogeneity were flooded with supercritical carbon-dioxide (scCO 2 ) saturated brine under reservoir conditions, 50 °C and 10 MPa, at a high (0.5 ml/min) and low (0.1 ml/min) flowrate. Changes to the pore structure brought about by dissolution were captured in situ using X-ray microtomography (micro-CT) imaging. Mass balance from effluent analysis sh owed a good agreement with calculations from imaging. Image calculated reaction rates (r eff ) were 5-38 times lower than the corresponding batch reaction rate under the same conditions of temperature and pressure but without mass transfer limitations. For both high (Péclet number = 2600-1200) and low (Péclet number = 420-300) flow rates, an impact of the initial rock heterogeneity was observed on both reaction rates and permeability-porosity relationships.
Issue Date: 24-Nov-2017
Date of Acceptance: 9-Nov-2017
URI: http://hdl.handle.net/10044/1/54922
DOI: https://dx.doi.org/10.1016/j.ijggc.2017.11.011
ISSN: 1750-5836
Publisher: Elsevier
Start Page: 99
End Page: 111
Journal / Book Title: International Journal of Greenhouse Gas Control
Volume: 68
Copyright Statement: © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Sponsor/Funder: Qatar Petroleum
Funder's Grant Number: N/A
Keywords: 04 Earth Sciences
05 Environmental Sciences
09 Engineering
Publication Status: Published
Open Access location: https://doi.org/10.1016/j.ijggc.2017.11.011
Appears in Collections:Earth Science and Engineering