Carbon Capture and Storage (CCS) is one of the methods that can significantly reduce CO2 emissions into the atmosphere. The UK is committed to an overall reduction of greenhouse gas emissions of at least 80% of 1990 levels by 2050 (Climate Change Act 2008). However, fossil fuels will continue to be used in the UK's power generation as well as in other industrial processes for decades to come. Therefore, the 2050 goal can only be achieved if the CO2 released from fossil fuel combustion in the power generation sector and energy-intensive industries is eliminated from the system either through fuel substitution or the application of Carbon Capture and Storage (CCS) to mitigate the rise in anthropogenic CO2. A key challenge in the short-term for driving CCS to deployment is the development of effective geological storage, the major concern being the risk of leakage from the storage formation. In this study, the effectiveness of the existing cemented wells in different types of storage complex (e.g. depleted oil and gas reservoirs and saline aquifers) will be examined. The CO2 migration through different types of cement considering geochemical and geotechnical effects will be modelled.

CO2 capture and storage; Geomechanical and geochemical modelling; Reservoir simulation