Practical leakage risk assessment for CO2 assisted enhanced oil recovery and geologic storage in Ohio's depleted oil fields

•Risks assessment for CO2 storage via CO2-EOR•May be applied to depleted oilfield storage cases•Well integrity risk based on public well data in three fields in Ohio•Likelihood rankings were developed into likelihoods for leakage•A bowtie method was conducted to develop field-scale risks•Risks were developed in US Dollars allowing practical understanding to CO2 storage operators and oilfield operators of the risk they may be taking