Abstract: Rows of horizontal production wells and rows of horizontal injection wells are drilled and alternating in a formation. The horizontal production wellbores and the horizontal injection wellbores are placed in the direction of a minimum horizontal stress in the formation. Within casing strings of the wells, at least two hydraulic frac ports are installed and multi-stage fracturing is performed through them in the production wells and in the injection wells in such way that fractures are formed along each production well and along each injection well in a direction perpendicular to the horizontal wellbore, the hydraulic fractures in the injection wells are offset from the hydraulic fractures in the production wells. The production and the injection wells are put into operation by injecting a fluid into the injection wells, a flow rate and/or a volume of the injected fluid are controlled in such a way that the injection pressure is below a fracturing pressure.