Accounting
Seyyed Abdollah Razavi; Bahar Homayoni; Sadegh Saffarzadeh
Abstract
In this study, by using a relatively complex reservoir model and reservoir simulator, the gas injection process was investigated from two technical and economic perspectives. This reservoir model has 4 production wells and 3 gas injection wells, which are in operational conditions for a period of 15 ...
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In this study, by using a relatively complex reservoir model and reservoir simulator, the gas injection process was investigated from two technical and economic perspectives. This reservoir model has 4 production wells and 3 gas injection wells, which are in operational conditions for a period of 15 and 10 years. Since gas injection with higher pressures in the reservoir requires more gas supply to stabilize the pressure, from a technical point of view, the effect of different injection pressures on the improvement of the final recovery factor and cumulative oil production was investigated. The findings show that all gas injection scenarios due to the increase in the oil recovery factor (injection with well bottom pressure in the scenarios of 3750, 4000, 4250, and 4500 psi led to an improvement of 10, 12, 13.7 and 15% respectively) compared to natural depletion (no gas injection in the reservoir) is desirable. From an economic point of view, after sensitivity analysis of the parameters related to production and injection (such as the price of produced oil, the price of produced gas, the cost of injected gas, and the discount rate), the results show that the increase in the price of oil and produced gas increases the economic added value of gas injection projects. Considering various parameters for the price of export gas as well as gas export costs (capital and operational), comparing the added value of gas injection projects with gas export showed that the higher the price of export gas, the more favorable gas export projects are compared to gas injection. Also, as the cost of gas export increases, the desirability of gas export decreases compared to gas injection in the reservoir.
Edris Junaki; Shima Ghanaatian; Ghasem Zargar
Abstract
A new chemical compound is developed at Petroleum University of Technology to enhance the recovery of the free imbibition process and simultaneously hinder asphaltene precipitation. The compound is tested on heavy oil samples from Marun oil field, Bangestan reservoir. The effects of the chemical compound ...
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A new chemical compound is developed at Petroleum University of Technology to enhance the recovery of the free imbibition process and simultaneously hinder asphaltene precipitation. The compound is tested on heavy oil samples from Marun oil field, Bangestan reservoir. The effects of the chemical compound on viscosity, hydrocarbon composition, and average molecular weight of the heavy oil are investigated. It is found that the substance dramatically reduces oil viscosity and molecular weight and hinders the precipitation of asphaltene in the heavy oil. The results of free imbibition tests demonstrate a significant recovery enhancement after oil reacts with the compound and is used in water in an Amott cell. Finally, the new chemical compound causes a significant reduction in surface tension and contact angle. This is verified by the molecular analysis of heavy oil after reacting with this ionic compound.
Ahad Fereidooni; Masoud Fereidooni; Siyamak Moradi; Ghasem Zargar
Abstract
Enhanced oil recovery using nitrogen injection is a commonly applied method for pressure maintenance in conventional reservoirs. Numerical simulations can be practiced for the prediction of a reservoir performance in the course of injection process; however, a detailed simulation might take up enormous ...
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Enhanced oil recovery using nitrogen injection is a commonly applied method for pressure maintenance in conventional reservoirs. Numerical simulations can be practiced for the prediction of a reservoir performance in the course of injection process; however, a detailed simulation might take up enormous computer processing time. In such cases, a simple statistical model may be a good approach to the preliminary prediction of the process without any application of numerical simulation. In the current work, seven rock/fluid reservoir properties are considered as screening parameters and those parameters having the most considerable effect on the process are determined using the combination of experimental design techniques and reservoir simulations. Therefore, the statistical significance of the main effects and interactions of screening parameters are analyzed utilizing statistical inference approaches. Finally, the influential parameters are employed to create a simple statistical model which allows the preliminary prediction of nitrogen injection in terms of a recovery factor without resorting to numerical simulations.
