PROCEDURES AND SYSTEM FOR PERFORATING RESERVOIR IN UNDERGROUND WELL Russian patent published in 2011 - IPC E21B43/11 E21B43/25 

FIELD: oil and gas production.

SUBSTANCE: one of versions of reservoir perforating procedure in underground well consists in reducing existing stress in well reservoir causing growth of threshold pressure of fluid medium at reduced operating stress of perforated reservoir in first borehole of well. Reduced stress of the reservoir additionally rises pressure in the second borehole of the well, thus lowering mechanical stress near the first borehole of the well. The perforation system consists of the first tool for reduction of existent stress in the reservoir by increasing threshold pressure of fluid medium in the first borehole of the well through pressure rise in the second borehole of the well and of the perforating tool. Also, the perforating tool is positioned in the first borehole of the well for perforation of the reservoir at lowered stress.

EFFECT: increased depth of perforation.

29 cl, 9 dwg