The choice of contract type in oil fields has always been one of the main and problematic challenges in Iran and elying in making decisions in this regard leads to a dely or non-investment. On the other hand, one of the ways to recognize the components of bargaining power is to recognize and evaluate various types of international contracts. Therefore, in thiss study, while introducing the fiscal model of the contractual agreement concluded in Iran, as well as a combination of contracts for participation in traditional production in Azerbaijan with Joint venture, has been applied to financial simulation in Duroud oil field. After explaining the optimization problem using the generalized reduction gradient method, the optimal production path from the perspective of the parties to the contract is estimated andcompared with the production path specified in the buy back contract. The results show that the use of share-based indicators of project revenues and the net present value of a project for evaluate of oil contracts can be misleading. The oil production path agreed in the Buy back contract is higher than the optimal production path from the perspective of both sides of the combined contract. Tthis is due to the desire of the International Oil Company to rapidly capture capex and remuneration fee in the shortest possible time. Increase in recoverable reserves due to gas injection (presented in MDP), which was approved in buy back contract is less than its optimal amount from the viewpoint of Joint venture in a hybrid contract. This indicates that the proposed hybrid contract is closer to the Maximum Effective Rate and Maximum Final Recovery from Oilfields than the conventional buy back agreement in Iran.