CO<sub>2</sub> geological storage: Microstructure and mechanical behavior of cement modified with a biopolymer after carbonation

Barría, Juan Cruz; Manzanal, Diego; Pereira, Jean‐Michel; Ghabezloo, Siavash

doi:10.1051/e3sconf/202020502007

E3S Web Conf.

2020

DOI: 10.1051/e3sconf/202020502007

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CO₂ geological storage: Microstructure and mechanical behavior of cement modified with a biopolymer after carbonation

Juan Cruz Barría

Diego Manzanal

Jean‐Michel Pereira

et al.

Abstract: Large amounts of CO2 could be stored underground in deep rock reservoirs and could help reducing emissions into the environment. Carbon geo-storage technologies have several years in development and new techniques and materials are being studied to make this procedure more effective and less expensive. The risk of leakage from geological reservoirs to other rock formations or even towards the surface means that long-term behavior must be carefully studied. The carbonation of the cement used for sealing the wel… Show more

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“…In this case, the large increase in porosity dulls the short-term hydration effects and the strength of cements with nanocellulose is lower prior to the carbonation process. After carbonation, a relative increase in the strength of the samples with BNC is higher, however, it is still below the strength of neat cement [4]. These experimental studies were simulated using a coupled chemo-hydro-mechanical model.…”

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Analysis of biopolymer modified oil cement under supercritical CO2

Manzanal,

Pereira,

Barría

2023

SEG

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Storing CO2 in deep underground reservoirs is key to reducing emissions to the atmosphere and standing against climate change. However, the risk of CO2 leakage from geological reservoirs to other rock formations requires a careful long-term analysis of the system. Mostly, oil well cement used for the operation must withstand the carbonation process that changes its poromechanical behavior over time, possibly affecting the system’s integrity.The use of nanoadditives for cement, such as bacterial nanocellulose (BNC), has been increasing in recent years. This biopolymer has particular properties that can improve cement performance, like high mechanical properties and thermal resistance. For this reason, and in light of the problems that carbonation may pose in the long term in the context of geological storage of CO2 studies were carried out under supercritical CO2 conditions analyzing the behavior of cement with nanocellulose additions.Rheological, mechanical, thermal, and microstructural tests were performed on samples with different percentages of BNC [1]. Subsequently, cylindrical specimens were subjected to supercritical CO2 conditions (20 MPa and 90 °C) with different percentages of nanocellulose using two curing methods, one long-term curing at low temperature [2] and one short-term curing at high temperature [3].These results showed that BNC produces an increase in slurry viscosity but retains a greater amount of water which aids in its subsequent hydration. This could be observed in its microstructure, where a greater amount of hydration products, a higher degree of hydration, and a decrease in porosity were observed. It is likely that this increase in hydration was the reason that cements with nanocellulose had a uniaxial compressive strength up to 20% higher than neat cement. It was also observed that higher BNC contents improve the thermo-mechanical behavior under oscillating bending stress. After carbonation, the microstructure shows that the capillary porosity decreases steadily to values of 5%, which reduces the penetration of carbonic acid into the sample. All cements showed a reduction in mechanical strength, but cements with BNC had a lower degree of carbonation and better mechanical behavior, because of the lower capillary porosity prior to carbonation (Figure 1). However, these effects were not observed when the cement was subjected to a curing process under unfavorable conditions at high temperatures. In this case, the large increase in porosity dulls the short-term hydration effects and the strength of cements with nanocellulose is lower prior to the carbonation process. After carbonation, a relative increase in the strength of the samples with BNC is higher, however, it is still below the strength of neat cement [4]. These experimental studies were simulated using a coupled chemo-hydro-mechanical model. The model simulates the carbonation front advance in cement subjected to supercritical CO2 and the changes generated by the chemical reactions using the classic balance equations of continuum mechanics relative to mass, momentum, entropy, and energy. Simultaneous dissolution of portlandite and C-S-H, dissolution of calcite, and a damage model were considered. The carbonation progress of the samples was represented and an extrapolation was made to an oil well based on the parameters obtained from the experiments and simulations.

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confidence: 99%

Analysis of biopolymer modified oil cement under supercritical CO2

Manzanal,

Pereira,

Barría

2023

SEG

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Effect of supercritical carbonation on porous structure and mechanical strength of cementitious materials modified with bacterial nanocellulose

Barría,

Manzanal,

Ghabezloo

et al. 2023

Mater Struct

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CO₂ geological storage: Microstructure and mechanical behavior of cement modified with a biopolymer after carbonation

Cited by 2 publications

References 15 publications

Analysis of biopolymer modified oil cement under supercritical CO2

Analysis of biopolymer modified oil cement under supercritical CO2

Effect of supercritical carbonation on porous structure and mechanical strength of cementitious materials modified with bacterial nanocellulose

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CO2 geological storage: Microstructure and mechanical behavior of cement modified with a biopolymer after carbonation

Cited by 2 publications

References 15 publications

Analysis of biopolymer modified oil cement under supercritical CO2

Analysis of biopolymer modified oil cement under supercritical CO2

Effect of supercritical carbonation on porous structure and mechanical strength of cementitious materials modified with bacterial nanocellulose

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Product

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About

CO₂ geological storage: Microstructure and mechanical behavior of cement modified with a biopolymer after carbonation