With the rapid development of CO₂ geological storage and utilization (CCS/CCUS), the abandoned well in the sites of CCS/CCUS projects is becoming an important subject to be solved to check whether it can effectively block the residual CO₂ or not. Up to now, the abandoned process of wells in the field of oil and gas in China and abroad have gained mature operation technology and rich experience. However, in the field of CCS/CCUS, there is only a small number of global public instances about the abandoned process of operational wells of CO₂ including CO₂ injection wells and CO₂ monitoring wells, and the domestic instance is still blank. In this paper, we firstly summarized the required demands, materials, cases of operational experiences, and monitoring requirements of the abandoned process of operational wells of CO₂ in the developed countries, e.g. the Netherlands, the United States and Canada. Then, we figured out the status of the abandoned process of domestic wells in oil and gas industry. Finally, we concluded the differences of the abandoned process between operational wells of CO₂ and traditional wells of oil and gas, and proposed some recommendations for the abandoned process of operational wells of CO₂ in the current and future CCS/CCUS projects in China. This study has important implications for the upcoming abandoned process of all the operational wells at Shenhua CCS demonstration site in 2016.