Performance assessment of miscible and immiscible water-alternating gas floods with simple tools

This study uses a slate of analytical tools to monitor flood performance in miscible and immiscible WAG floods. These tools include the capacitance-resistance model (CRM) and several diagnostic plots, such as the reciprocal-productivity index (RPI), the water-oil ratio (WOR), EOR-efficiency-measure plot, and modified Hall plot (MH). This paper offers several alternative CRM solutions to account for unbalanced patterns.