Abstract
In injection-well carbon storage projects, the degradation of Portland cement under harsh CO2 conditions is a primary concern. This study introduces novel CO2-resistant calcium aluminate cement (CAC) systems with addition of rubber latex and hollow glass microspheres which are added to the system to enhance the set cement resistance to CO2 corrosion and in the same time to optimize it for the application in a wide variety of well conditions. After exposure to near supercritical CO2 conditions (100 °C, 7 MPa) these systems exhibited enhanced compressive strength and reduced porosity compared with conventional Portland cement (PC) system, especially the one without latex. By subjecting degradation depth-resolved samples to thermogravimetry (TG) and X-ray diffraction (XRD) techniques, coupled with scanning electron microscopy (SEM), the study scrutinized alterations in microstructural properties. This methodological approach unveiled a profound grasp of carbonation mechanisms. Confirmed through TG and XRD analyses, the considerable reduction in carbonation establishes CAC as a compelling choice for CO2-resistant sealing within injection-well CO2 storage endeavors.
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