In-Situ X-ray Tomography Study of Cement Exposed to CO2 Saturated Brine

E. A.  Chavez Panduro; M. Torsæter; K. Gawel; R. Bjørge; A. Gibaud; Yi Yang; Stefan Bruns; Yi Zheng; Henning Osholm Sørensen; D.W. Breiby

doi:10.1021/acs.est.6b06534

In-Situ X-ray Tomography Study of Cement Exposed to CO₂ Saturated Brine

E. A. Chavez Panduro, M. Torsæter, K. Gawel, R. Bjørge, A. Gibaud, Yi Yang, Stefan Bruns, Yi Zheng, Henning Osholm Sørensen, D.W. Breiby

Kemisk Institut

19 Citationer (Scopus)

Abstract

For successful CO₂ storage in underground reservoirs, the potential problem of CO₂ leakage needs to be addressed. A profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions including elevated temperature, high pressure and the presence of CO₂ saturated brine is required. Here, we report in situ X-ray micro computed tomography (μ-CT) studies visualizing the microstructural changes upon exposure of cured Portland cement with an artificially engineered leakage path (cavity) to CO₂ saturated brine at high pressure. Carbonation of the bulk cement, self-healing of the leakage path in the cement specimen, and leaching of CaCO₃ were thus directly observed. The precipitation of CaCO₃, which is of key importance as a possible healing mechanism of fractured cement, was found to be enhanced in confined regions having limited access to CO₂. For the first time, the growth kinetics of CaCO₃ under more realistic well conditions have thus been estimated quantitatively. Combining the μ-CT observations with scanning electron microscopy resulted in a detailed understanding of the processes involved in the carbonation of cement. (Figure Presented).

Originalsprog	Engelsk
Tidsskrift	Environmental Science & Technology (Washington)
Vol/bind	51
Udgave nummer	16
Sider (fra-til)	9344-9351
Antal sider	8
ISSN	0013-936X
DOI	https://doi.org/10.1021/acs.est.6b06534
Status	Udgivet - 15 aug. 2017

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10.1021/acs.est.6b06534

Citationsformater

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title = "In-Situ X-ray Tomography Study of Cement Exposed to CO2 Saturated Brine",

abstract = "For successful CO2 storage in underground reservoirs, the potential problem of CO2 leakage needs to be addressed. A profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions including elevated temperature, high pressure and the presence of CO2 saturated brine is required. Here, we report in situ X-ray micro computed tomography (μ-CT) studies visualizing the microstructural changes upon exposure of cured Portland cement with an artificially engineered leakage path (cavity) to CO2 saturated brine at high pressure. Carbonation of the bulk cement, self-healing of the leakage path in the cement specimen, and leaching of CaCO3 were thus directly observed. The precipitation of CaCO3, which is of key importance as a possible healing mechanism of fractured cement, was found to be enhanced in confined regions having limited access to CO2. For the first time, the growth kinetics of CaCO3 under more realistic well conditions have thus been estimated quantitatively. Combining the μ-CT observations with scanning electron microscopy resulted in a detailed understanding of the processes involved in the carbonation of cement. (Figure Presented).",

author = "{Chavez Panduro}, {E. A.} and M. Tors{\ae}ter and K. Gawel and R. Bj{\o}rge and A. Gibaud and Yi Yang and Stefan Bruns and Yi Zheng and S{\o}rensen, {Henning Osholm} and D.W. Breiby",

year = "2017",

month = aug,

day = "15",

doi = "10.1021/acs.est.6b06534",

language = "English",

volume = "51",

pages = "9344--9351",

journal = "Environmental Science & Technology",

issn = "0013-936X",

publisher = "American Chemical Society",

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TY - JOUR

T1 - In-Situ X-ray Tomography Study of Cement Exposed to CO2 Saturated Brine

AU - Chavez Panduro, E. A.

AU - Torsæter, M.

AU - Gawel, K.

AU - Bjørge, R.

AU - Gibaud, A.

AU - Yang, Yi

AU - Bruns, Stefan

AU - Zheng, Yi

AU - Sørensen, Henning Osholm

AU - Breiby, D.W.

PY - 2017/8/15

Y1 - 2017/8/15

N2 - For successful CO2 storage in underground reservoirs, the potential problem of CO2 leakage needs to be addressed. A profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions including elevated temperature, high pressure and the presence of CO2 saturated brine is required. Here, we report in situ X-ray micro computed tomography (μ-CT) studies visualizing the microstructural changes upon exposure of cured Portland cement with an artificially engineered leakage path (cavity) to CO2 saturated brine at high pressure. Carbonation of the bulk cement, self-healing of the leakage path in the cement specimen, and leaching of CaCO3 were thus directly observed. The precipitation of CaCO3, which is of key importance as a possible healing mechanism of fractured cement, was found to be enhanced in confined regions having limited access to CO2. For the first time, the growth kinetics of CaCO3 under more realistic well conditions have thus been estimated quantitatively. Combining the μ-CT observations with scanning electron microscopy resulted in a detailed understanding of the processes involved in the carbonation of cement. (Figure Presented).

AB - For successful CO2 storage in underground reservoirs, the potential problem of CO2 leakage needs to be addressed. A profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions including elevated temperature, high pressure and the presence of CO2 saturated brine is required. Here, we report in situ X-ray micro computed tomography (μ-CT) studies visualizing the microstructural changes upon exposure of cured Portland cement with an artificially engineered leakage path (cavity) to CO2 saturated brine at high pressure. Carbonation of the bulk cement, self-healing of the leakage path in the cement specimen, and leaching of CaCO3 were thus directly observed. The precipitation of CaCO3, which is of key importance as a possible healing mechanism of fractured cement, was found to be enhanced in confined regions having limited access to CO2. For the first time, the growth kinetics of CaCO3 under more realistic well conditions have thus been estimated quantitatively. Combining the μ-CT observations with scanning electron microscopy resulted in a detailed understanding of the processes involved in the carbonation of cement. (Figure Presented).

U2 - 10.1021/acs.est.6b06534

DO - 10.1021/acs.est.6b06534

M3 - Journal article

C2 - 28701043

SN - 0013-936X

VL - 51

SP - 9344

EP - 9351

JO - Environmental Science & Technology

JF - Environmental Science & Technology

IS - 16

ER -

In-Situ X-ray Tomography Study of Cement Exposed to CO2 Saturated Brine

Abstract

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In-Situ X-ray Tomography Study of Cement Exposed to CO₂ Saturated Brine