Nanosilica-Based Sealing of Wellbore Cement Leaks in Geological CO₂ Storage: A Geotechnical and Geochemical Approach
This study demonstrates that a sodium-induced nanosilica gel serves as an effective, thermally stable sealant for remediation of CO₂ leaks in fractured wellbore cement, with sealing performance significantly enhanced by higher nanosilica concentrations and diminished by wider fracture widths.