Research institute of Petroleum Industry (RIPI) Journal of Petroleum Research 2345-2900 34 1403-3 2024 08 22 An Integrated Approach to Evaluate and Rank the Enhanced Oil Recovery Methods from Reservoirs: A Case Study An Integrated Approach to Evaluate and Rank the Enhanced Oil Recovery Methods from Reservoirs: A Case Study 118 137 1428 10.22078/pr.2024.5174.3300 FA Alireza Roustaei Hydrocarbon Reservoirs Management, Tehran Faculty of Petroleum Technology, Iran Mohammad Ali Hatefi Division of Energy Economics and Management, Tehran Faculty of Petroleum Technology, Iran Journal Article 2023 07 16 This study aims to evaluate and rank the potential Enhanced Oil Recovery (EOR) methods in one of Iran›s oil reservoirs (Asmari reservoir). In this regard, two main steps including screening of EOR methods and risk analysis were carried out. First, four EOR methods including combined carbon dioxide injection, polymer injection, nitrogen injection, and alternating water and gas injection (WAG) were screened using the Adaptive Neuro-Fuzzy Inference System (ANFIS) approach, and two methods such as combined carbon dioxide injection and polymer injection were determined as suitable candidate EOR methods for the studied reservoir. Then, in order to evaluate them more accurately, the risks of these two methods in the EOR process were identified and evaluated using the Delphi method and the Failure Modes and Effects Analysis (FMEA) approach. The results of the risk evaluation showed that the two risks of «severe damage due to asphaltene deposition» and «reduction of permeability» were respectively the most important ones of applying the methods of carbon dioxide injection and polymer injection in enhanced oil recovery from the studied reservoir. In addition, the cumulative score of the extraction factor and the overall risk priority number for the two mentioned methods showed that the implementation of the polymer injection method has a lower risk and, in general, is considered the best method in enhanced oil recovery from the studied reservoir. This study aims to evaluate and rank the potential Enhanced Oil Recovery (EOR) methods in one of Iran›s oil reservoirs (Asmari reservoir). In this regard, two main steps including screening of EOR methods and risk analysis were carried out. First, four EOR methods including combined carbon dioxide injection, polymer injection, nitrogen injection, and alternating water and gas injection (WAG) were screened using the Adaptive Neuro-Fuzzy Inference System (ANFIS) approach, and two methods such as combined carbon dioxide injection and polymer injection were determined as suitable candidate EOR methods for the studied reservoir. Then, in order to evaluate them more accurately, the risks of these two methods in the EOR process were identified and evaluated using the Delphi method and the Failure Modes and Effects Analysis (FMEA) approach. The results of the risk evaluation showed that the two risks of «severe damage due to asphaltene deposition» and «reduction of permeability» were respectively the most important ones of applying the methods of carbon dioxide injection and polymer injection in enhanced oil recovery from the studied reservoir. In addition, the cumulative score of the extraction factor and the overall risk priority number for the two mentioned methods showed that the implementation of the polymer injection method has a lower risk and, in general, is considered the best method in enhanced oil recovery from the studied reservoir. https://pr.ripi.ir/article_1428_0663a4ddceacb40b095eda264a85f15c.pdf