DEVICE FOR SLOT PERFORATION OF CASED BOREHOLE Russian patent published in 2013 - IPC E21B43/114 

FIELD: oil and gas industry.

SUBSTANCE: device includes hydraulic motor and carriage with axial movement drive all located in cylindrical housing, at the carriage there mounted are hydraulic monitor and mechanism of exit cutting in cased borehole with end mill tool that has rotating drive from hydraulic motor and axial movement via hydraulic cylinder, mechanism of housing fixing in cased borehole, operating fluid supply line and hydraulic control system. Hydraulic monitor is mounted in unit that has, at least, one hydraulic monitor, and at the carriage diametrically relatively hydraulic monitor unit and exit cutting mechanism there additionally mounted are hydraulic monitor unit and exit cutting mechanism. Both exit cutting mechanisms are mounted in carriage guides and hydraulic cylinder of axial movement of their end mill tools is mounted on exit cutting mechanisms and is made two-piston. Drive shaft of hydraulic motor is kinematically connected to worm-and-worm gear, on the leading screw of which there is a carriage mounted via nut fixed on it, and to driving sprocket engaged by chain gearing through following sprocket with driving sprocket that is mounted on end mill tools spindles.

EFFECT: increasing of production rate at reduction of operation costs.

2 dwg