A miscible CO2 injection project and evaluation in Daqing, China

The paper introduces the entire process for a CO2 injection in the Fang-48 Group, Daiqng Oilfield. A study using experiment and full-field reservoir modeling investigated and optimized the design of a CO2 miscible flooding project for Fang-48 Group, Daqing. It began with extensive data gathering in the field and building a full-field three-dimensional geologic model. A full field simulation model with relatively coarse gridding was subsequently built and used to history match the depletion and water flood. The focus of the history match is to highlight the remaining oil area. Also, the aim was to form a favorable system for CO2 injection. A fine-griCO2 model was setup after the history match. Both pure CO2 and WAG injection are simulated. In the continuous CO2 injection, different injection rates were simulated. In the CO2 WAG injection simulation, different water-gas ratios were investigated. The efficiencies of mobility control of all cases were also analyzed.