From 6 to 10 January 2011 at the well № 103 Peschanodolskoe oilfield the window has been cut in 146mm production casing.

Thus, at a depth of 2388m was installed the whipstock hydraulic type BS-146. Orienting of whipstock produced by small-sized gyro MiG-42. Installation work of the whipstock and window cutting were made in a single tripping. The mill wear during the work was slightly less than 0.5 mm.

The BHA for drilling a sidetrack passed through the window without complications.