A laboratory approach on the improvement of oil recovery and carbon dioxide storage capacity improvement by cyclic carbon dioxide injection

This paper experimentally investigated influential thermodynamic reservoir characteristics such as pressure, temperature, soaking time, core stimulation, number of cycles, shale particle size, and carbon dioxide phase during the cycling carbon dioxide injection. The carbon dioxide supercritical phase has reached the maximum recovery factor of 40%. When carbon dioxide is in the supercritical phase, its density will become lower than the liquid phase due to the high pressure. Therefore, the oil recovery factor has been increased in micro and nanopores. It is concluded that more than 12 h of carbon dioxide soaking would not play a significant role in oil recovery enhancemen