<p>The paper presents the results of numerical studies of nonlinear filtration of high-viscosity oil in an element of a development system with four wells with hydraulic fracturing. In one of the wells, heated oil is extracted with a staged high-frequency electromagnetic effect on the formation, and in the remaining wells, “cold” high-viscosity oil is extracted. The distribution of pressure and temperature in the “wells–cracks–formation” system is simulated with various pressure differences between the well and the formation, at various values of the initial pressure gradient. The technology with a staged thermal effect was compared with the case of constant “cold” production of high-viscosity oil.</p>