Comparative evaluation of immiscible, near miscible and miscible CO2 huff-n-puff to enhance oil recovery from a single matrix-fracture system (experimental and simulation studies)

► In this study we examined the applicability of CO2 based huff-and-puff to fractured reservoirs. ► We performed a numerical simulation to history match the experimental results obtained. ► Effects of key parameters on the performance of CO2 based huff-and-puff are examined. ► It was concluded that injecting CO2 at supercritical condition is the most viable option for EOR.