Cutting tool for cutting well casing

Details Cutting tool for cutting well casing Cutting tool for cutting well casing

1988-11-17

1990-07-03

Bilinsky, Z. R.

Wells

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

Cutter rotates circumferentially of pipe

82 15, 408145, 408180, E21B 2900

Patent

active

049382918

ABSTRACT:
A cutting tool (22) having elongate cutter arms (36) mounted about a pivot pin (40) for outward swinging movement. Cutting blades (58, 60) are mounted on the lower ends of the cutter arms (36) and have a plurality of closely fitting hard carbide cutting elements (90) secured thereto and forming an inclined leading planar cutting surface (82) inclined from the upper end of the associated blade (58, 60) at an angle A between one (1) degree and twenty (20) degrees relative to the direction of rotation. The cutting elements (90) have parallel rear and front faces (90A, 90B) connected by a peripheral side surface (90C) extending perpendicularly to the parallel faces (90A, 90B). Several embodiments of pivotally mounted cutter arms (36, 36A, 36B, and 36C) are illustrated including various blades (58, 60, 58F, 60F, 116, and 114) having a plurality of closely fitting cutting elements arranged thereon in a plurality of longitudinally and transversely extending rows for forming the leading inclined planar cutting surface.

REFERENCES:
patent: 3195636 (1965-07-01), Cordary et al.
patent: 4710074 (1987-12-01), Springer

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