Milling apparatus with replaceable blades

Details Milling apparatus with replaceable blades Milling apparatus with replaceable blades

1989-05-09

1991-04-30

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Noncutting portion forwardly of cutting portion

166 557, 175412, 407 34, 408224, E21B 1062

Patent

active

050109677

ABSTRACT:
An apparatus for milling away tubular conduits encased within well bores is disclosed. The milling device consists of a cylindrical body. The body forms longitudinal slots therein for radially disposed replaceable cutter blades that are inserted through the slots from the inside of the body. A central mandrel mechanically locks the replaceable blades between the mandrel and the tubular body. A finned pilot head or guide is affixed to the downstream end of the milling apparatus, the opposite threaded upstream end is adapted to be connected to a drill string.

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patent: 4710074 (1987-12-01), Springer
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