Development scenarios and risk assessment of “Neft Dashlari” field

Abstract

Energy is essential for living in the world. There are many energy types exist in the world. Petroleum is also kind of energy in the world. Petroleum is also important in industry. There are a lot of things producing from petroleum. Since ancient time petroleum is important thing and depending on it is also actual. Work of petroleum engineers is producing oil from wells with efficiency way. It is challenge of Reservoir engineers to detect exact oil reserves in every condition. It is not easy that to detect oil in every condition. Because in some condition there is some uncertainties to calculating oil value. It’s also important to producing oil as much as possible. It is challenging to produce as much as possible in different scenarios. Depending on situation there are different problems happen both in reserve estimation and production. Problem of uncertainties of reserve estimation is the problem of uncertainties data to calculating reserves. There is also problem to producing oil after pressure drop. There are some impact methods to producing petroleum. Impact methods are changing belonging to reservoir condition. In the world practice, the development of oil fields using the irrigation method is very widespread. Currently, more than 90% of all oil fields are developed using secondary methods. The generalization of the field development experience shows that the results of the application of this method should be widely studied today, despite the fact that the application of the irrigation process has yielded mainly positive results. Incomplete coverage of non-homogeneous strata by the application of the injection process, increasing the volume of difficult-to-extract reserves, complicating the characteristics of the oil-saturated porous reservoir, changing the physical and chemical properties of produced oil in the final stage of development, increasing man-made manifestations in fields, creating difficulties in efficient development In many cases, the recovery of formation energy for the creation of efficient development systems in the fields, the close connection of the injected working agent with the compression of oil in the porous environment of the reservoirs is associated with the optimization of irrigation systems during development. The method of treatment with alkaline solutions forms sodium soaps in the layer, which reduces the surface tension and creates an emulsion of oil in water. The amount of additional oil that can be extracted from the fields depends on the parameters of the emulsion and the distribution of the oil in the formation. Thus, when the layers are exposed to an alkaline solution, a wave of highly dispersed emulsion is formed, which affects the increase in oil recovery. Application of the method in oil and sand-carbonate reservoir fields with oil viscosity up to 100 mPas, oil saturation more than 50%, permeability of reservoir rocks greater than 0.1 μm2, oil density 850-980 kg / m3, formation temperature up to 1000C and s. higher effect is obtained when Unfavorable factors are cracking of strata, high clay content and high mineralization of produced waters. It was determined that as a result of injection of alkaline solutions into the reservoirs, it is possible to increase their final oil recovery factor by 5-10%.The efficiency of oil field development depends on the extraction of oil from the pores by various methods. As the viscosity of injected water differs sharply from the viscosity of produced oils, its compressibility is not high: water injected into the reservoir with various modifications does not provide maximum leaching of oil from the porous medium by moving it to working wells with high permeability channels. Therefore, polymers are added to the injected water, which increases its viscosity. As a result, conditions are created for more active washing of produced oil, and the efficiency of the injection process increases. These uncertainties increase the risks of hydrocarbon reserves in the fields. Thus, uncertainties in the calculation of oil and gas reserves are the main geological risks.