PERFORATOR CHARGE Russian patent published in 2005 - IPC

FIELD: oil industry.

SUBSTANCE: charge has axial-symmetrical explosive charge case, open hollow in form of spherical segment in body of charge, detonator and two-layer casing of hollow, made with inner diameter of base d, equal to 0.8-0.85 of charge base diameter D. two-layer casing is made with concave portion along axis equal to 0.30-0.35 d. inner layer of casing directed to hollow consists of material with lesser specific mass, of for example aluminum, and outer casing layer, directed to explosive charge is made of material with greater specific mass, for example, copper with thickness, equal to 0.030-0.035 d. relation of specific masses of inner and outer casing layers is within limits 0.15-0.23 and, respectively, relation of their thicknesses equals 0.5-0.8.

EFFECT: higher efficiency.

1 dwg, 1 tbl