Milling tool for cutting well casing
This patent describes a tool for cutting a metal well casing at an open upper end. It comprises a body having a lower portion adapted to be received within the casing for rotation about a longitudinal axis. The improvement consists of a plurality of blades on the body at spaced intervals about the body and extending outwardly therefrom, each of the blades having a base with a leading surface relative to the direction of rotation, a plurality of metal carbide cutting elements secured to the leading surface of the base in a predetermined generally symmetrical pattern and being of a generally similar size and shape for each blade. The cutting elements are positioned on the leading surface of each blade in a plurality of closely spaced parallel rows extending generally outwardly from the axis of rotation and in a plurality of closely spaced parallel columns extending generally along the axis of rotation, with each row having at least two cutting elements therein. The front faces and associated cutting edges of the lowermost row of cutting elements define a lower generally continuous cutting surface which is progressively worm away during the cutting operation. The lowermost cutting elements form a lower cutting surface biting into the upper end of the casing.
- Assignee:
- Tri-State Oil Tool Industries, Inc., Bossier City, LA
- Patent Number(s):
- US 4796709
- OSTI ID:
- 6314102
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
CUTTING
CUTTING TOOLS
DESIGN
ELEMENTS
MACHINING
METALS
MOTION
NATURAL GAS WELLS
OIL WELLS
OPERATION
ROTATION
TOOLS
WELL CASINGS
WELLS