Carbon dioxide (CO2) injection data and oil/gas/water production data for the Bell Creek oil field. CO2 injection began in the Bell Creek Field in May of 2013. The data herein includes monthly values from the start of injection through December of 2016. Three Excel spreadsheets are included in the EDX submission. One spreadsheet contains monthly summary information for the oil field, while the other two spreadsheets provide the data on a well-by-well basis (one for injection, one production). The monthly summation data are provided in thousand standard cubic feet (Mscf), cubic meters, short tons, and metric tons. The well-by-well injection data and gas (CO2) production data are reported in Mcf, the water and oil production in barrels. These data were obtained from the Montana Board of Oil and Gas.