Formation of an amorphous silica gel barrier under CO2 storage conditions
CA Castaneda-Herrera, JR Black, EM Llanos, GW Stevens, RR Haese
International Journal of Greenhouse Gas Control | ELSEVIER SCI LTD | Published : 2018
Risk assessments of Carbon Capture and Storage (CCS) have identified that in some instances carbon dioxide (CO2) leakage through the caprock cannot be entirely precluded, e.g. through high permeability undetected zones. This study recommends the use of a geochemical barrier that forms upon reaction with CO2, as a means to mitigate and remediate CO2 leakage. The proposed technology is based on the injection of an alkaline sodium silicate solution that reacts with the leaking CO2, leading to silica gel formation. Laboratory studies undertaken to evaluate this technology, included flow-through and core-flood experiments at ambient and reservoir conditions, respectively. The tests aim was to ass..View full abstract
We acknowledge the Australian National Low Emissions Coal Research and Development (ANLEC R&D) for providing funding for this project. ANLEC R& D is supported by the Australian Coal Association Low Emissions Technology Limited and the Australian Government through the Clean Energy Initiative. The authors thank the CO2CRC and the Peter Cook Centre for CCS Research for their support and technical oversight of the project. Thanks for support from the Trace Analysis for Chemical, Earth and Environmental Sciences (TrACEES) platform from the Melbourne Collaborative Research Infrastructure Program (MCRIP) at the University of Melbourne. Acknowledgements to The David Lachlan Hay Memorial Fund for the financial support on the writing of this manuscript. We would also like to thank the reviewers of this paper for their valuable and constructive comments.