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Key to carbon capture and storage is the integrity of the formation/reservoir that the CO2 will be stored within.
Whilst legacy oil and gas fields are considered good carbon capture and storage locations, given the proven formation properties and existing pipeline and platform infrastructure, a key risk and liability is the remaining suspended, or abandoned legacy wells. These legacy wells may have been abandoned correctly at the end of the field’s life, but barrier selection and testing may not be suitable for underground CO2 storage applications. A field that would otherwise be the perfect carbon capture and storage location could be discounted due to CO2 integrity concerns, or even need a costly relief or intersection well drilled to correctly plug and abandon the legacy well and ensure it's secure.