CUMULATIVE WELL PERFORATOR Russian patent published in 2013 - IPC E21B43/117 

FIELD: oil and gas industry.

SUBSTANCE: cumulative well perforator includes a frame with sockets and cumulative charges placed in sockets; each of them has a metal casing, metal cladding, main charge of explosive agent, detonation unit in the rear part of the main charge casing with two parallel grooves. In detonation unit there are two detonating cords that connect cumulative charges and axial socket with additional charge of explosive agent closed by one side of surface with axial part of the main part charge of explosive agent charge and by the opposite sides with detonating cords. Detonating cords along their length between cumulative charges are spaced from each other at the distance preventing reciprocal transmission of detonation. The detonation unit is capable of explosive wave damping at explosion of detonating cords in order to stabilise detonation front spreading along the main charge of explosive agent. Cumulative perforator has a sealed enclosure. Detonation unit is made of material with low sound speed. Detonation unit is made as a collar of elastic material.

EFFECT: invention allows improvement in reliability of complete actuation and efficiency of cumulative perforator operation due to optimisation of detonation circuit redundancy and increase of tunnel depth.

7 cl, 2 dwg