| Summary: | To select the optimum methods, such criteria like reservoir heterogeneity, reservoir pressure, reservoir temperature, crude oil type API (American Petroleum Institute), and brine salinity. EOR methods contained water flooding, chemical flooding, nanofluids injection, CO2 (carbon dioxide) injection, SAGD/WAG (Surfactant assisted gas drainage/water alternative gas injection), and hybrid injection. Multi-criteria decision-making methods of FTOPSIS (a fuzzy technique for order preference by similarity to ideal solution) and FAHP (fuzzy analytic hierarchy process) were used to select the optimum in the EOR method. The hybrid injection is considered the preferable oil recovery enhancement method in both FTOPSIS and FAHP methods. It has a normalized weight of 74% and 23% for FTOPSIS and FAHP, respectively. In the FTOPSIS method, SAGD/WAG and CO2 methods are the second and third preferred enhanced oil recovery methods with the normalized weight of 65% and 56%, respectively. In the FAHP method, CO2 and SAGD/WAG methods are the second and third preferred enhanced oil recovery methods with the normalized weight of 19% and 14%.
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