Drill bit and cutter therefor

Patent · Tue Feb 03 04:00:00 EST 1987

OSTI ID:7062854

Barr, J D; Fuller, J M

A drag-type drill bit is described comprising: a bit body adapted for rotative movement in a pre-determined direction in use and having an operating end face; and a plurality of cutting members mounted in the bit body, each of the cutting members having a stud portion disposed in a respective recess in the bit body and defining the inner end of the cutting member, and a cutting face generally adjacent the outer end of the cutting member facing outwardly through the end face of the bit body and terminating in an outermost cutting edge, the centerline of the study portion being rearwardly inclined from the outer end to the inner end with respect to the direction of movement in use. It is taken at the midpoint of the cutting edge, at a first angle from 80/sup 0/ to 30/sup 0/ inclusive; and the cutting face being oriented such that the tangent to the cutting face at the midpoint of the cutting edge and in the central plane of the cutting member, is disposed at a second angle, from 18/sup 0/ to 75/sup 0/ inclusive, with respect to the centerline of the stud portion.

• Assignee: NL Industries, Inc., New York, NY
• Patent Number(s): US 4640375
• OSTI ID: 7062854
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
DESIGN
DRILL BITS
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
INCIDENCE ANGLE
MOTION
NATURAL GAS WELLS
OIL WELLS
OPERATION
ORIENTATION
ROTATION
WELL DRILLING
WELLS