Well bore casing mill with expandable cutter bases
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United States of America Patent
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Jul 4, 2017
Issued Date -
N/A
app pub date -
Aug 6, 2013
filing date -
Aug 10, 2012
priority date (Note) -
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Abstract
A casing mill for downhole casing milling has multiple elongated cutter bases hingedly connected to a main body by a plurality of positioning arms. An operating mechanism within the main body of the casing mill, actuated by fluid flow, moves the cutter bases to an extended position. Multiple cutters fixed to the cutter bases are then positioned to engage a casing end surface. Preferably, the cutters are arranged in vertically spaced apart rows, such that when one row is worn out in the milling process a visual indication is seen at the surface, as the casing mill drops to the next row of cutters.
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