PERFORATOR FOR MAKING CHANNELS IN CASED WELL Russian patent published in 2011 - IPC E21B43/11 

FIELD: gas and oil production.

SUBSTANCE: perforator for making channels in cased well consists of case with moveable carriage. The lowered on pipes case has a tool in form of a drill making holes in the casing. The tool is equipped with a hydraulic drive of lengthwise displacement communicated with a cavity of pipes and furnished with a rotation drive. Further, the perforator consists of a bit for drilling rock and set on a hollow flexible shaft connected with a hollow driving shaft equipped with a hydraulic drive of lengthwise transfer and the rotation drive, of a drive for carriage positioning with a tool opposite the casing or a bit opposite a hole in the casing, of an anchor for fixing the perforator at specified depth and of a hydraulic deflector. The perforator has a reverse drive for positioning the carriage and for rotation of the tool or the flexible shaft with the bit. The bit with the flexible shaft and the hydraulic drive are displaced inside the pipes by means of displacing devices. The anchor is positioned outside the case and is in threaded connection with a sub connected to the case.

EFFECT: avoiding failures in sequence of operations; replacement of worn bits without lifting string and perforation of channels at specified space between them.

4 cl, 2 dwg