Milling Before Running Casing: Surface testing a Section Mill before RIH to create a window inside a 9 5/8" #casing, during a P&A program that has a micro annulus in the B-annulus. Mill is designed for milling tubular fish, cleaning a casing internal diameter before running a casing patch and suppressing the damaged parts of a casing. Mill can be perfectly directed into the fish head, avoiding side tracking. The pilot is hardfaced for optimum resistance to wear and enables perfect, smooth guidin