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An Investigation into $CO_{2}$–Brine–Cement–Reservoir Rock Interactions for Wellbore Integrity in $CO_{2}$ Geological Storage
Content Provider | MDPI |
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Author | Jahanbakhsh, Amir Liu, Qi Mosleh, Mojgan Hadi Agrawal, Harshit Farooqui, Nazia Mubeen Buckman, Jim Recasens, Montserrat Maroto-Valer, Mercedes Korre, Anna Durucan, Sevket |
Copyright Year | 2021 |
Description | Geological storage of $CO_{2}$ in saline aquifers and depleted oil and gas reservoirs can help mitigate $CO_{2}$ emissions. However, $CO_{2}$ leakage over a long storage period represents a potential concern. Therefore, it is critical to establish a good understanding of the interactions between $CO_{2}$–brine and cement–caprock/reservoir rock to ascertain the potential for $CO_{2}$ 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 $CO_{2}$-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. |
Starting Page | 5033 |
e-ISSN | 19961073 |
DOI | 10.3390/en14165033 |
Journal | Energies |
Issue Number | 16 |
Volume Number | 14 |
Language | English |
Publisher | MDPI |
Publisher Date | 2021-08-16 |
Access Restriction | Open |
Subject Keyword | Energies Petroleum Engineering Co2 Geological Storage Wellbore Integrity Co2–brine-cement–reservoir Rock Interaction Permeability Chemical and Petrophysical Characterisation |
Content Type | Text |
Resource Type | Article |