Bench tests were carried out for milling 4 windows from one mark in the section of the casing pipe with a diameter of 139.6 mm made of high-quality steel (C95). In the process of testing, the layout of the Perfobore with a 75 mm cutter and a special screw downhole motor was used.

The length of the milled "window" - up to 800 mm;

Average milling time - 7.5 hours;

The average penetration rate is 8.1 cm/h.