SHAPED-CHARGE DOWNHOLE GUN Russian patent published in 2008 - IPC E21B43/117 

FIELD: oil, gas, water and other fluid production, particularly perforators and permeators.

SUBSTANCE: shaped-charge gun comprises body formed of separate modules pivotally connected with each other by means of links with longitudinal coaxial channels. The channels are filled with explosive. One link has cylinder with spherical head. Another link has spherical bed arranged inside link body. Annular undercut is created in cylinder end from spherical head side so that the undercut is coaxial to cylinder end and to spherical head. Part of link body with spherical bed is installed in the undercut. Magnitude of angle defined by axis of one orifice made in body with spherical link bed and by module axis is selected from range defined by maximal value calculated from formula.

EFFECT: extended functional capabilities and increased perforation uniformity.

3 dwg