HYDROMECHANICAL SLOT PERFORATOR (VERSIONS) Russian patent published in 2012 - IPC E21B43/112 

FIELD: oil and gas industry.

SUBSTANCE: perforator includes housing, piston-pusher arranged in it, return spring, deflecting wedge and extension-type cutting tool mounted on the axis and providing the possibility of performing diametrically located slots in the well column. In the housing between piston-pusher and return spring there installed is the module made at least of one working assembly in the form of a cylinder inside which there installed is extension-type cutting tool having the possibility of its extension through two diametrical through longitudinal cutouts made in the wall of the cylinder, or through one through longitudinal cutout in the cylinder wall, which encloses diametrical direction of extension of the above tool. Extension-type cutting tool is made in the form of a balance arm that is installed with possibility of interacting with deflecting wedge and in shoulders of which there arranged on the axis are two discs. Axis of balance arm is rigidly fixed on inner walls of cylinder so that its longitudinal movement is provided together with cylinder and installed with eccentricity relative to centre of gravity of balance arm so that length of shoulder of balance arm is provided to axis of upper disc, which is more than length of shoulder of balance arm to axis of lower disc; at that, deflecting wedge with which the balance arm interacts is rigidly fixed in perforator housing, and number of deflecting wedges arranged in the housing corresponds to the number of working assemblies in the module.

EFFECT: improving reliability and manufacturability of perforator during the operation; increasing efficiency.

7 cl, 4 dwg