CUMULATIVE PERFORATOR (VERSIONS) Russian patent published in 2016 - IPC E21B43/117 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to perforating-explosive operations in oil and gas wells. According to a first version, cumulative perforator comprising a bearing structure, in which hollow charges are arranged in groups consisting of one or more pairs of charges. Charges which form a pair are arranged relative to each other at an angle α, angle between pairs of charges β is different from angle in pairs α or equal thereto, and angle between groups of charges ϕ is different from angle in pairs α and angle between pairs β or equal to them. According to second version, cumulative perforator comprising a bearing structure, in which hollow charges are arranged in groups consisting of one or more pairs of charges and additional single charges. Charges, which form a pair are arranged relative to each other at an angle α, angle between pairs of charges β is different from angle in pairs α or equal to angle between a pair of charges and single charge γ, and angle between groups of charges - ϕ, wherein single charges may be located in any of groups.

EFFECT: providing high level of perfection of opening productive formations, optimum coverage of productive formations with perforation channels when opening, highest number of perforated channels in radial direction in cross section of well, reduced size of formation zones not covered by perforated channels, and reduction of explosive action on well during actuation of perforator.

19 cl, 14 dwg