Following an unsuccessful third-party contractors work on the salt-acid treatment of bottomhole formation zone the packers were left on the well bottom. Fishing for their extraction from wells produced no results. The customer decided to drill a lateral hole, setting the whipstock above the packers.

Thus, December 5-th 2011 our engineers and the sidetracking crew of JSC "SSC" produced by excision of the window casing. High depth of window cutting (3'515m), thick-walled "fresh" column (146 * 9.5 mm) and bad weather conditions(storm wind reached 18 m / s) were unable to disrupt the schedule of works for the cutting of the window.

The window was cut in 5.5 hours. The BHA of the drilling passed through the window without landing and leads.