Definition<INTERRUPTION MILLING> is <MILLING> or grinding to remove junk in the hole or to grind away all or part of a casing string during an interruption of the drilling
In the case of junk, the metal must be broken into smaller pieces to facilitate removal from the wellbore so that drilling can continue. When milling casing, the intent is to cut a window through the side of the casing or to remove a continuous section of the casing. As defined by the Norwegian Oil Directorate in the "
