Wellbore cement is the primary hydraulic barrier material used in wellbore construction, with properties similar to the formation rock. It serves multiple purposes such as providing mechanical support and zonal isolation, maintaining well performance, and restoring sealing barriers during the wellbore abandonment. However, Portland cement with brittle nature makesit subject to failure at downhole conditions. To improve wellbore cement properties that impact the resistance to failure, three additive materials are explored: 1) olivine to prevent chemical attack from CO2 rich geofluids, 2) zeolite for its water storage and slow moisture release that can potentially prevent drying shrinkage and potentially promoting self-healing capabilities, and 3) graphene to increase strength and/or decrease tendency of the material to fracture. Investigation of the mechanisms for how these additives contribute to the enhanced performance of the cement matrix indicates that they can positively impact the cement properties that enable effective and resilient zonal isolation.
