Risk Assessment in Offshore Salt Caverns to Store CO2

Although factual experience of developing offshore salt cavern to CO2 disposal in ultra-deep water is unprecedent, the theme has been gaining relevant attention in Brazil, fueled by the challenges imposed by oil production on the Pre-Salt reservoirs. It is true that some authors have conducted researches related to CO2 disposal on onshore salt caverns, but most of the works regarding salt cavern are related to onshore constructions that are used as methane store to supplement gas consumption during the peak energy demands that historically occurs during the winter season in the North hemisphere. This paper aims to contribute for CO2 disposal research, describing the results obtained from the application of a Preliminary Risk Analysis (PRA) during the conceptual engineering phase of an offshore salt cavern to store CO2 in Brazilian Pre-Salt.