Milling tool for cutting well casing

Wells – Means for perforating – weakening – bending or separating pipe... – Cutter rotates circumferentially of pipe

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408 80, 408144, E21B 2900

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active

047967099

ABSTRACT:
A milling tool (10) for processively cutting away a section of casing (14) installed within a well from the upper annular end (12) of the casing (14). The milling tool (10) includes a plurality of elongate blades (32) equally spaced from each other at intervals between one and three inches about the periphery of the cylindrical body (18) of the milling tool (10). The blades (32) are inclined with respect to the axis of rotation and hard carbide cutting discs (34) arranged in horizontal rows on the blades (32) form the inclined leading planar face of the blades (32), and the lowermost row of discs (34) forms a cutting edge with a negative rake engaging the upper end (12) of the casing (14) in a cutting operation.

REFERENCES:
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patent: 4710074 (1987-12-01), Springer
1984-85, "Composite Catalog of Oil Field Tools & Services", p. 6707, Servco Catalog.
1984-85, "Composite Catalog of Oil Field Tools & Services", p. 7213, Tri-State Oil Tool Industries Catalog.
Advertising Circular for "Lockomatic" Expanding Hole Opener of Tri-State Oil Tool Industries, Manual 5110B, 1-85.

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