PERFORATOR FOR OIL-WELL TUBING Russian patent published in 2009 - IPC E21B43/112 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry, particularly to oil field equipment applied for perforating oil-well tubing in wells. The perforator for oil well tubing includes a body consisting of three parts, in upper and middle parts of which there are made cavities filled with air and a liquid filled chamber located between them wherein pistons with plungers are installed. In the lower part of the body there is a filled with liquid chamber via a channel connected with a piston-puncher perpendicular to the axis of the perforator and a friction element interacting with a valve; the friction element is secured on the interior wall of the body. Also a through vertical aperture is made in the valve from the side facing the channel; and a dog interacting with the piston-puncher and displacing the valve in horizontal plane is installed on the other side of the valve.

EFFECT: simplification of perforator design and increased efficiency of operation owing to increased punching characteristic.

4 cl, 4 dwg