Method and apparatus for identifying a bad mill track, and borehole system

Abstract

A method for identifying a bad mill track, including running a whipstock assembly, including a whipstock, an anchor attached to the whipstock and a debris management device attached to the whipstock, the device including a tracer, to a kick-off point in a borehole, running a mill along the whipstock, and monitoring a cuttings stream for presence of the tracer. A whipstock assembly including a whipstock, an anchor attached to the whipstock, a debris management device attached to the anchor, the device inhibiting the migration of debris from a mill during use from migrating downhole of the anchor, and a tracer disposed in contact with the debris management device, the tracer configured for release from the device in the event the device is damaged. A borehole system, including a borehole in a subsurface formation, a string in the borehole, and a whipstock assembly disposed within or part of the string.

Dependencies are inferred from the claim text.