FIELD: oil and gas industry.
SUBSTANCE: method of subsurface perforation lies in delivery of shaped charge to the well; this charge consists of a case, explosive material in the case and coating that surrounds explosive material in the above specified case; it has a top part which profile is thicker than profile of any other part of the coating, at that coating and its top part are made of powder material and density of the material in the top part is bigger than density of material in adjoining part of the coating while porosity in the top part is less than porosity of material in adjoining part of the coating; thereafter shape charge is detonated.
EFFECT: increase of flame penetration length to formation resulting in gain in yield of hydrocarbons or any other fluids from the perforated formation.
11 cl, 9 dwg
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