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1. A device essentially mounted on a tubing string insertable into a well casing associated with a productive formation; said well casing defines an inner sidewall surface thereof; said device defines an outer surface thereof; said device includes: an upper packer and a lower packer, wherein the lower packer defines an inner cavity thereof: an inter-packer annulus defined as a space between the outer surface of said device and the inner sidewall surface of said well casing, vertically limited by positions of the upper packer and the lower packer; and wherein the upper packer and the lower packer are configured for controllable separating and sealing the inter-packer annulus; an internal cavity located under the lower packer; a hydraulic fracturing port located between the upper packer and the lower packer, said hydraulic fracturing port is essentially coupled with the lower packer; said hydraulic fracturing port defines a port housing divided by a partition into a first portion and a second portion, wherein: fracturing holes are provided in the first portion, port radial holes are provided in the second portion and configured for providing controllable hydraulic communication of the internal cavity with the inter-packer annulus; a first hollow rod partially extending through the second portion and partially extending through the inner cavity of the lower packer; a valve located below the lower packer; said valve includes a valve housing provided with valve housing radial holes and a movable second hollow rod provided with valve rod radial holes; a mechanical anchor located below the lower packer; and a perforator being in controllable hydraulic communication essentially with the tubing string located below and rigidly coupled with the mechanical anchor.
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