Abstract: A thru-tubing mill with an elongate body having an attachment end and a milling end. The attachment end is attached to a tubing string. The milling end has a semi-torroidal surface defined by a two-dimensional curved line rotated about a central point that is spaced from the curve in a direction that is perpendicular to the curved line and a plurality of curved support members attached to the semi-torroidal surface that extend along the semi-torroidal surface, each curved support members having a first curve similar to the two-dimensional curved line in a first dimension and a second curve that is cambered relative to the two-dimensional curved line in a second dimension. A hard coating is installed on at least one side of the curved support members.

Abstract: A thru-tubing mill with an elongate body having an attachment end and a milling end. The attachment end is attached to a tubing string. The milling end has a semi-torroidal surface defined by a two-dimensional curved line rotated about a central point that is spaced from the curve in a direction that is perpendicular to the curved line and a plurality of curved support members attached to the semi-torroidal surface that extend along the semi-torroidal surface, each curved support members having a first curve similar to the two-dimensional curved line in a first dimension and a second curve that is cambered relative to the two-dimensional curved line in a second dimension. A hard coating is installed on at least one side of the curved support members.