Research institute of Petroleum Industry (RIPI) Journal of Petroleum Research 2345-2900 34 1403-4 2024 10 22 Multi-objective Optimization of Gas Injection in Common Fields with Emphasis on the Fisical Regime of Different Type of Oil Contracts (A Case Study) Multi-objective Optimization of Gas Injection in Common Fields with Emphasis on the Fisical Regime of Different Type of Oil Contracts (A Case Study) 16 40 1443 10.22078/pr.2024.5298.3350 FA Aliakbar Kargar Multi-objective Optimization of Gas Injection in Common Fields with Emphasis on the Fisical Regime of Different Type of Oil Contracts (A Case Study) Behnam Sedaee Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, Iran 0000-0002-4506-2024 Ali Vatani Institute of Liquefied Natural Gas, School of Chemical Engineering, College of Engineering, University of Tehran, Iran Journal Article 2023 11 07 Common field oil recovery had always been a priority for political and governance reasons. In addition to the technical factors of field development, the fisical aspects of the development is also an effective factor in the progress. One of the most important effective factors in financing aspect of IOR/ EOR is selection and adjustment fisical system of oil contracts. The current research was performed on a simulated model of a field in the Southwest of Iran, with the variables of oil production and gas injection rates , the perforation interval, and the location of new wells. The cumulative production and oil migration in the reservoir were investigated as optimization functions. The optimization of these variables to achieve the desired technical functions has been done with NSGA-II evolutionary algorithm. After obtaining a set of equivalent optimal answers (Pareto front), Net present value and government fisical income as economical functions were investigated in three fisical models of  the Buyback, Production Share Contract and Iran Petroleum Contracts. After optimization process of the technical objective functions, a hundred different scenarios have been proposed. After the technical and fisical investigations and comparison between the three contracts, it was found that the current net value of Iran Petroleum Contracts was higher than the other two types of contracts. Also, the final fisical income of the field has generally decreased from the scenarios with emphasis on cumulative production to the scenarios with emphasis on less migration. Buyback contract, the net present value is independent of technical functions. The other two types of contracts produced different net present value and the government’s earnings on different condition. Common field oil recovery had always been a priority for political and governance reasons. In addition to the technical factors of field development, the fisical aspects of the development is also an effective factor in the progress. One of the most important effective factors in financing aspect of IOR/ EOR is selection and adjustment fisical system of oil contracts. The current research was performed on a simulated model of a field in the Southwest of Iran, with the variables of oil production and gas injection rates , the perforation interval, and the location of new wells. The cumulative production and oil migration in the reservoir were investigated as optimization functions. The optimization of these variables to achieve the desired technical functions has been done with NSGA-II evolutionary algorithm. After obtaining a set of equivalent optimal answers (Pareto front), Net present value and government fisical income as economical functions were investigated in three fisical models of  the Buyback, Production Share Contract and Iran Petroleum Contracts. After optimization process of the technical objective functions, a hundred different scenarios have been proposed. After the technical and fisical investigations and comparison between the three contracts, it was found that the current net value of Iran Petroleum Contracts was higher than the other two types of contracts. Also, the final fisical income of the field has generally decreased from the scenarios with emphasis on cumulative production to the scenarios with emphasis on less migration. Buyback contract, the net present value is independent of technical functions. The other two types of contracts produced different net present value and the government’s earnings on different condition. https://pr.ripi.ir/article_1443_8fb5f8be2aa9d6c64a04e3ab9f63feee.pdf