FIELD: oil and gas industry, recovery of efficiency of running well by perforation of casing string and clearance cement stone by shaped charges. SUBSTANCE: gear has body housing shaped charges which are connected by detonating cord. Body of gear comes in the form of bell equipped with pressure charging system. Pressure charging system is manufactured in the form of evaporation gas producer utilizing cryogenic liquid. EFFECT: raised functional reliability of perforation gear. 1 cl, 1 dwg
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