UNIVERSAL HYDROMECHANICAL SLOT PERFORATOR Russian patent published in 2009 - IPC E21B43/112 

FIELD: oil and gas production.

SUBSTANCE: invention relates to petroleum industry and can be used at secondary producing formation exposing. Universal hydromechanical slot perforator includes diverter valve, block of actuating cylinders, consisting of main, intermediate and auxiliary actuating cylinders, cutter with extendable crush roll, water jet nozzle and sliding support. On casing of diverter valve it is installed changeable centering skid, implemented in the form of separate cylinder, inner diametre of which corresponds casing diametre of diverter valve, and by perimetre of external diametre of this cylinder there are diametrically opposite located big and small sliding supports of centering skid. Additionally external surface of supports corresponds part of surface of other cylinder, axis of which is shifted relative to axis of the first cylinder, and its diametre is for 4-5 mm less than inner diametre of punched production string. Additionally top and bottom edge of these supports allows conic bevels. Small supports are located so that between them it is a gap, value of which more than width of cut slot, and in operation position centering skid is fixed on surface of diverter valve by means of clamping nut. Cutter of perforator is outfitted by changeable sliding bearing, bearing surface of which is implemented in the form of cylinder part with external diametre equal to inner diametre of punched production string.

EFFECT: expansion of operational functionality of perforator in strings, as small and as big diametres.

3 dwg