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Article

An Investigation into CO2–Brine–Cement–Reservoir Rock Interactions for Wellbore Integrity in CO2 Geological Storage

1
Research Centre for Carbon Solutions (RCCS), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK
2
Department of Earth Science and Engineering, Royal School of Mines, Imperial College London, London SW7 2BP, UK
3
Institute of Geo-Energy Engineering, School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh EH14 4AS, UK
*
Authors to whom correspondence should be addressed.
Academic Editor: João Fernando Pereira Gomes
Energies 2021, 14(16), 5033; https://doi.org/10.3390/en14165033
Received: 18 May 2021 / Revised: 10 August 2021 / Accepted: 12 August 2021 / Published: 16 August 2021
Geological storage of CO2 in saline aquifers and depleted oil and gas reservoirs can help mitigate CO2 emissions. However, CO2 leakage over a long storage period represents a potential concern. Therefore, it is critical to establish a good understanding of the interactions between CO2–brine and cement–caprock/reservoir rock to ascertain the potential for CO2 leakage. Accordingly, in this work, we prepared a unique set of composite samples to resemble the cement–reservoir rock interface. A series of experiments simulating deep wellbore environments were performed to investigate changes in chemical, physical, mechanical, and petrophysical properties of the composite samples. Here, we present the characterisation of composite core samples, including porosity, permeability, and mechanical properties, determined before and after long-term exposure to CO2-rich brine. Some of the composite samples were further analysed by X-ray microcomputed tomography (X-ray µ-CT), X-ray diffraction (XRD), and scanning electron microscopy–energy-dispersive X-ray (SEM–EDX). Moreover, the variation of ions concentration in brine at different timescales was studied by performing inductively coupled plasma (ICP) analysis. Although no significant changes were observed in the porosity, permeability of the treated composite samples increased by an order of magnitude, due mainly to an increase in the permeability of the sandstone component of the composite samples, rather than the cement or the cement/sandstone interface. Mechanical properties, including Young’s modulus and Poisson’s ratio, were also reduced. View Full-Text
Keywords: CO2 geological storage; wellbore integrity; CO2–brine-cement–reservoir rock interaction; permeability; chemical and petrophysical characterisation CO2 geological storage; wellbore integrity; CO2–brine-cement–reservoir rock interaction; permeability; chemical and petrophysical characterisation
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MDPI and ACS Style

Jahanbakhsh, A.; Liu, Q.; Hadi Mosleh, M.; Agrawal, H.; Farooqui, N.M.; Buckman, J.; Recasens, M.; Maroto-Valer, M.; Korre, A.; Durucan, S. An Investigation into CO2–Brine–Cement–Reservoir Rock Interactions for Wellbore Integrity in CO2 Geological Storage. Energies 2021, 14, 5033. https://doi.org/10.3390/en14165033

AMA Style

Jahanbakhsh A, Liu Q, Hadi Mosleh M, Agrawal H, Farooqui NM, Buckman J, Recasens M, Maroto-Valer M, Korre A, Durucan S. An Investigation into CO2–Brine–Cement–Reservoir Rock Interactions for Wellbore Integrity in CO2 Geological Storage. Energies. 2021; 14(16):5033. https://doi.org/10.3390/en14165033

Chicago/Turabian Style

Jahanbakhsh, Amir, Qi Liu, Mojgan Hadi Mosleh, Harshit Agrawal, Nazia M. Farooqui, Jim Buckman, Montserrat Recasens, Mercedes Maroto-Valer, Anna Korre, and Sevket Durucan. 2021. "An Investigation into CO2–Brine–Cement–Reservoir Rock Interactions for Wellbore Integrity in CO2 Geological Storage" Energies 14, no. 16: 5033. https://doi.org/10.3390/en14165033

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