We have studied an internal combustion CO2 power plant to enhance oil recovery. The plant has air separation of O-2 for combustion and of N-2 for injection, a combustion chamber, a turbine, a compressors, a recuperator, and a cooling tower. The oil-derived gases are used to produce liquid CO2, highly compressed N-2, process steam and, if necessary, power. No exhaust gases are released. The plant design is presented along with efficiency calculations. The plant should be of interest for offshore oil production.