Method for forming a window in a tubular and apparatus for use in said method

摘要

A mill (400) is provided for milling an opening in a tubular, comprising a body (402) having an upper end connectable to a drill string, a lower end provided with milling and/or cutting material, a first fluid flow bore (406) extending generally axially of the body, a second fluid flow bore extending from the first fluid flow bore and opening in the exterior of the body (402) substantially on the rotational axis thereof, and a plurality of inclined fluid flow bores (416) extending from the first fluid flow bore (406) and opening in the exterior of the body around the second fluid flow bore. The second fluid flow bore is lined with a layer of milling and/or cutting material (414). <IMAGE> <IMAGE>