International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The fluids that are present in the underground reservoirs of oil and gas, both in the initial conditions and in the exploitation conditions of the reservoir, experience different phase behavior. All these are accompanied by different physico-chemical parameters, the determination of which plays an important role in the hydrodynamic study of the well or the reservoir as a whole. The fluids released from the formation change over time due to the change in the phase state of the fluids, their material and energy balance. In this study, based on the field data obtained during the exploitation of the oil and gas bearing bed, the physico-chemical parameters of the gas were determined based on the correlations derived from the various experimental studies carried out in the world.

Oil and gas accumulations located in the porous spaces of the formation exist as a single hydraulically connected system and are factors of many physico-chemical processes that occur, depending on the different conditions that develop in the layer. The study of fluid filtration in porous media, their type, the condition in which the flow occurs and its geometric form, are the main key in which the testing of a well begins and then the determination of various hydrodynamic parameters. In reservoir engineering, the stages of filtration that develop and the changes that occur in the phase state of the fluid are closely related to the changes that occur in the pressure of the reservoir, which characterizes the energy of the layer for the production of fluids on the surface. Radial flow is used in many practical applications in solving various problems encountered in reservoir engineering and precisely the main objective of this paper, is to present a solution of the average pressure of the reservoir in the case of radial flow using a mathematical approach.