Wellbore milling tools and inserts

Details Wellbore milling tools and inserts Wellbore milling tools and inserts

1995-09-22

1997-05-06

Dang, Hoang C.

Wells

Means for perforating, weakening, bending or separating pipe...

Cutter rotates circumferentially of pipe

175426, 407116, E21B 1046

Patent

active

056261896

ABSTRACT:
A cutting insert for wellbore milling operations is disclosed which, in certain embodiments, has two or more top milling surfaces on an insert body with the surfaces at different heights above a bottom of the insert body. In certain embodiments three top surfaces are used stair-stepped, with a central lower surface, or with a central higher surface. In one aspect all cutting surfaces have an array of chipbreaking indentations. Tools and methods are disclosed which use such inserts.

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