December 2nd 2011 our engineers cut the window at well number 11 751 Romashkinskoye field.

НAt a depth of 976m has been set whipstock hydraulic type BS-146-02 (KOT). Since the well conditioned - vertical (zenith angle in the window cutting depth is less than 4 degrees), it was decided to use precisely this type whipstock. It is designed specifically for vertical wells and has a clamping device that prevents accidental closing of windows already cut.

Work of window cutting was performed according to work plan in full. Sidetrack drilling BHA through the window passed smoothly without hitch.