Key words: bottomhole formation zone, producing wells, the effective permeability.
The article presents the interpretation of the data obtained by the hydrodynamic studies of producing wells, exploiting oil reserves in the clastic sediments in several fields of Perm region. Conducting well tests on unsteady modes wells to curves of pressure recovery is almost always associated with the distortion of the results due to the influence afterflow effect, flow of fluid in the well bore after stopping it for analysis. Data were interpreted by the semi-log plot and with a differential method, which takes into account afterflow effect. According to the results of the interpretation of the sample data, were obtained dependence of the flow on the productivity of wells to stop, and the ratio of the effective permeability and oil viscosity at reservoir conditions.
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