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An investigation into co2–brine–cement–reservoir rock interactions for wellbore integrity in co2 geological storage

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Title: An investigation into co2–brine–cement–reservoir rock interactions for wellbore integrity in co2 geological storage
Authors: Jahanbakhsh, A
Liu, Q
Mosleh, MH
Agrawal, H
Farooqui, NM
Buckman, J
Recasens, M
Maroto‐valer, M
Korre, A
Durucan, S
Item Type: Journal Article
Abstract: 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 inter-face. 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 per-forming 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.
Issue Date: 16-Aug-2021
Date of Acceptance: 12-Aug-2021
URI: http://hdl.handle.net/10044/1/91430
DOI: 10.3390/en14165033
ISSN: 1996-1073
Publisher: MDPI AG
Start Page: 1
End Page: 20
Journal / Book Title: Energies
Volume: 14
Issue: 16
Copyright Statement: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K035967/1
Keywords: 02 Physical Sciences
09 Engineering
Publication Status: Published
Online Publication Date: 2021-08-16
Appears in Collections:Earth Science and Engineering

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