The article is devoted to the study of the process of oil flow from the matrix to the fractures. The coefficient of intraporous overflow is a measure of the heterogeneity of the system of fractures – matrix pores and the amount of fluid flowing from the matrix into the fractures and from fractures into matrix. This parameter is an important factor that determines the production of oil reserves, and can take different values in a fairly wide range. The coefficient of intraporous overflow depends on a number of factors, such as the size and permeability of blocks, the permeability of fractures. In order to determine the flow coefficient, materials of hydrodynamic well studies processed in accordance with the Warren – Root model were used. Schemes for changing the coefficient of flow over the area of one of the Tournaisian-Famennian deposits in the initial period of its development and after 5 years of its operation are constructed. A joint analysis of the results of calculations and the field material made it possible to establish that the maximum volumes of oil were obtained from the sections of the deposit with the maximum values of the flow coefficients. Coefficient of overflow should be considered the most important indicator characterizing the features of the structure and development of reserves from the deposits with the presence of zones of distribution of the fractured reservoir. It has been established that the decrease in bottomhole pressures entails a significant decrease in the coefficient of overflow, and, as a consequence, worsens the productive characteristics of the well. The possible deterioration of the process of mass exchange between the matrix and fractures must be taken into account when justifying the permissible downhole pressures. To ensure maximum flow volumes from the matrix to the fracture zones, it is necessary to introduce a reservoir pressure maintenance system in the early stages of exploiting deposits that have a natural fracture.
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