METHOD OF OPENING PRODUCTIVE WELL FORMATION BY SHAPED CHARGES AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2018 - IPC E21B43/117 

FIELD: oil industry.

SUBSTANCE: group of inventions refers to shooting and blasting operations in oil and gas wells. Method of opening a productive formation of a well by cumulative charges consists in delivering into a perforation interval of the productive formation a supporting structure with shaped charges, subsequent activation of the shaped charges and formation of a perforation channel in the productive formation of the well. Before delivering to the formation interval the shaped charges are placed one after the other onto the supporting structure along it. After delivering to the formation interval, sequential shots of the shaped charges are produced with the formation of the perforation channel with dimensions sufficient for moving the supporting structure or part thereof with the shaped charges, with the advance of the supporting structure with the shaped charges into the depth of the formation. Shooting of each subsequent shaped charge increases the volume of the perforation channel obtained by shooting the previous shaped charge.

EFFECT: thus ensured the formation of perforations many times exceeding in depth and in volume within the productive formation of the well, the ability to set, to control, to regulate the depth and the volume of the perforation channel, and also to orient its direction; the negative impact of the explosion products on the casing string and its cement ring is substantially reduced due to the provision of a high-quality hydrodynamic connection of the well with the formation.

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