Chevron recently tasked Smith Services and Scientific Drilling with a casing exit and directional drilling challenge in the Permian Basin.  A 7” casing exit was planned for the Grayburg and San Andres formations, which are difficult to drill with conventional window mill technology.  The Smith Services GeoTrack Mill was selected for its PDC cutting structure and its proven ability to drill most rock types.  Scientific Drilling’s Titan ERT High-Torque Motor and Gyro-MWD System were employed to orient the casing exit and directionally drill the formation.  The objective was to produce a full gauge, clean window and build angle to 7° and hold while directionally drilling 350 feet of formation to the KOP, all in one trip.  The combinations of Smith and Scientific technologies formed the system that enabled formation footage, direction, and casing exit objectives to be achieved.