Simulation Study of CO2 Injection in Tight Oil Reservoirs

The exploitation of Tight oil reservoirs has become a topic of interest to many searchers; the choice of methods and techniques to use, depending on the characteristics of the fluids in place is the main focused point for this purpose. Tight oil formation is formation with an ultra-low permeability (less than 0.1 mD); Horizontal well and hydraulic fracturing were identified by many searchers as the main methods to exploit this kind of reservoir. However, some new knowledge about the improvement of the oil recovery helped us to understand that there is still a lot of remaining oil in the reservoir after applying these methods: we chose CO2 huff-n-puff process to enhance the oil recovery. In this paper, we used The Bakken oil formation study as our base case. Our work is focused on parameters that can improve oil recovery without spending a high cost. We noticed that some parameters such as reservoir permeability, number of fracture per stage, CO2 injection rate, number of CO2 huff-n-puff cycle, CO2 injection time and fracture permeability can be key parameters for the improvement of the oil recovery.