PERFORATION SYSTEM FOR WELL CASING STRING Russian patent published in 2013 - IPC E21B43/116 

FIELD: mining.

SUBSTANCE: perforation system for well casing string comprising a hollow body with holes along its side surface, hollow plugs with bottoms fixed in body holes at the specified angles to the body axis. The body cavity is communicated with cavities of plugs and forms a single tight system with the medium of specified density. Jet charges are placed in the body. Each of these charges is aligned towards the appropriate hollow plug - along its axis. Hollow plugs, with their bottom part, protrude beyond the body dimensions by the value providing for alignment of this body in the casing string of the specified diameter and damage of plug bottoms in the operating position of the perforation system in the zone near the casing string and the focus distance of jet charges. At the same time the body has diameter and length providing for its longitudinal flexibility.

EFFECT: improved piercing capacity of a perforation system regardless of perforated casing string diameter and well curve.

14 cl, 1 dwg