CCUS-EOR is an effective measure to improve the oil recovery rate and oil recovery rate of heavy oil bottom water reservoirs entering the ultra-high water cut development stage. At the same time, it is also an important way to actively respond to the national “dual carbon” goals and explore the carbon burial potential of geological bodies. In view of the development contradictions faced by carrying out CCUS-EOR measures in reservoirs such as reservoir efficiency improvement, wellbore incompatibility, unstable surface operation, frequent process failures, and high environmental pressure, this article starts from reservoir planning—wellbore upgrades—ground treatment—anti-corrosion prevention and control—In terms of circulating gas injection, research on “five complete” supporting technologies has been carried out. Through mining practice in the K104 fault block of the Kongdian Oilfield, the reservoir recovery rate and oil production speed have been improved, the level of process support has been improved, the buried carbon potential of the geological body has been contributed, and the extremely high bottom water reservoir of heavy oil has been explored. A new way to improve efficiency in the water-bearing development stage has high promotion value.