Another work of window milling in a nonstandard casing 9-7/8” #62.8ppf (251mm x 15.5mm) at the end of July was carried out by the specialists of DI LLC for the construction of an offshore exploration well Octly-1.

The hydraulic type whipstock KLEN-HA 9-7 / 8 "with an unique anchor was set at a depth of 1100 m. Rigid customer requirements, high cost of drilling rig rent were accompanied by a very strong steel grade (P-110) of a new casing. Despite all the difficulties and high responsibility, a fairly strong 15.5 mm casing was cut during 9.5 hours, the 6m rat hole was completed in 3 hours.