Estimates of CO2 leakage along abandoned wells constrained by new data

Postma, Tom J.W.; Bandilla, Karl W.; Celia, Michael A.

doi:10.1016/j.ijggc.2019.03.022

Cited by 17 publications

(4 citation statements)

References 24 publications

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“…However, the same structures used for CO 2 injection into the reservoirs can constitute potential paths for gas leakage into shallow geological structures, or back to the atmosphere (Abid et al, 2018;Carroll et al, 2016;Dong et al, 2020). Thus, ensuring the wellbore integrity throughout its life cycle (construction, injection, monitoring and abandonment) is a key issue for CCS projects (Kiran et al, 2017;Omosebi et al, 2017;Postma et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In CCS storage sites, the presence of acid gases, such as supercritical CO 2 , creates additional problems related to cement degradation and steel casing corrosion (Kiran et al, 2017;Postma et al, 2019;Torsaeter et al, 2015;Wakeel et al, 2019). Thus, it is necessary to ensure that all materials used in the wellbore construction are able to withstand geological conditions for long periods, ensuring the quality of the hydraulic seal and preventing uncontrolled fluids circulation along the reservoir (Dong et al, 2020;Omosebi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, once the drilling of the well progresses to deeper reservoirs, with more adverse pressure and temperature conditions, it is necessary to develop new cement formulations that can meet design requirements and are able to resist a long-term exposure to CO 2 (Iyer et al, 2018;Omosebi et al, 2016;Postma et al, 2019;Wang et al, 2017). Among the most common strategies for changing cement properties is the use of SCM in paste formulations, which alter the composition of the cement minerals, its porous structure, and the material's chemical and mechanical resistance (Abid et al, 2020;Ghafari et al, 2016;Ledesma et al, 2020;Lothenbach et al, 2011;Paris et al, 2016;Tiong et al, 2019;Yin et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Basalt powder as a supplementary cementitious material in cement paste for CCS wells: chemical and mechanical resistance of cement formulations for CO2 geological storage sites

Ponzi

Santos

Martel

et al. 2021

International Journal of Greenhouse Gas Control

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Basalt powder as a supplementary cementitious material in cement paste for CCS wells: chemical and mechanical resistance of cement formulations for CO2 geological storage sites

Ponzi

Santos

Martel

et al. 2021

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

“…In this context, the wellbore integrity is identified as the most critical issue to the CCS infrastructure since it may provide a https://doi.org/10.1016/j.ijggc.2020.103077 Received 10 October 2019; Received in revised form 18 May 2020; Accepted 22 May 2020 pathway for fluid to escape from the subsurface environment to shallow formations or, in the worst scenario, back to the surface (Bagheri et al, 2018;Li and Nygaard, 2018). Thus, preserving the wellbore integrity throughout the project's operational life cycle (construction, injection, monitoring and abandonment) is a key issue for CCS effectiveness (Omosebi et al, 2017;Postma et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Wellbore integrity in a saline aquifer: Experimental steel-cement interface degradation under supercritical CO2 conditions representative of Brazil’s Parana basin

Vecchia

Santos

Schütz

et al. 2020

International Journal of Greenhouse Gas Control

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From our work, significant progress has been made in understanding the degradation of cement-casing systems. The CO 2 degradation process was evaluated in specimens with a large interfacial defect, such as large annular spaces, voids and/or channels, which may be the result of a poor cementing job. From the experiments showing no interfacial defect, no signs of degradation were observed, while from experiments showing interfacial defect, both the cement and steel undergo significant degradation. In the well casing, the CO 2 -rich brine affects the steel phase, leaching Fe 2+ ions into solution and promoting FeCO 3 precipitation on the material surface, while on the cement sheath, two processes are occurring: (i) the portlandite dissolution and (ii) the cement carbonation process. Then, iron (Fe 2+ ) starts to migrate into the cement structure, compromising the material's self-healing and pore-blocking features, while calcium (Ca 2+ ) starts to compose the corrosion film from the formation of mixed carbonates (Fe x Ca y CO 3 ) so reducing the corrosion layer's protection. Finally, both ions (Ca 2+ and Fe 2+ ) become so abundant in the material vicinity that they may form calcium carbonate (CaCO 3 ) on the corrosion layer and iron carbonate (FeCO 3 ) in the cement matrix. Thus, from our results, the degradation mechanisms of the cement-casing system in CO 2 -rich brine was revised.

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An Integrated Modeling Approach for Vertical Gas Migration Along Leaking Wells Using a Compressible Two-Fluid Flow Model

2023

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Gas migration behind casings can occur in wells where the annular cement barrier fails to provide adequate zonal isolation. A direct consequence of gas migration is annular pressure build-up at wellhead, referred to as sustained casing pressure (SCP). Current mathematical models for analyzing SCP normally assume gas migration along the cemented interval to be single-phase steady-state Darcy flow in the absence of gravity and use a drift-flux model for two-phase transport through the mud column above the cement. By design, such models do not account for the possible simultaneous flow of gas and liquid along the annulus cement or the impact of liquid saturation within the cemented intervals on the surface pressure build-up. We introduce a general compressible two-fluid model which is solved over the entire well using a newly developed numerical scheme. The model is first validated against field observations and used for a parametric study. Next, detailed studies are performed, and the results demonstrate that the surface pressure build-up depends on the location of cement intervals with low permeability, and the significance of two-phase co-current or counter-current flow of liquid and gas occurs along cement barriers that have an initial liquid saturation. As the magnitude of the frictional pressure gradient associated with counter-current of liquid and gas can be comparable to the relevant hydrostatic pressure gradient, two-phase flow effects can significantly impact the interpretation of the wellhead pressure build-up.

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Estimates of CO2 leakage along abandoned wells constrained by new data

Cited by 17 publications

References 24 publications

Basalt powder as a supplementary cementitious material in cement paste for CCS wells: chemical and mechanical resistance of cement formulations for CO2 geological storage sites

Basalt powder as a supplementary cementitious material in cement paste for CCS wells: chemical and mechanical resistance of cement formulations for CO2 geological storage sites

Wellbore integrity in a saline aquifer: Experimental steel-cement interface degradation under supercritical CO2 conditions representative of Brazil’s Parana basin

An Integrated Modeling Approach for Vertical Gas Migration Along Leaking Wells Using a Compressible Two-Fluid Flow Model

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