Rotary drill bit

Patent · Tue Feb 03 04:00:00 EST 1987

OSTI ID:7062848

Dennis, M D

A rotary drill bit is described for cutting in earth formations, comprising: a bit body including a cutting face having an outer peripheral edge and a central recess extending longitudinally inwardly from the peripheral edge, bores formed in the cutting face and containing nozzles for emitting drilling fluid under pressure, cutter elements, some of which being mounted in the peripheral edge, and others of which being mounted in the recess to fracture an earthen core formed as the drill cuts through the formation, the cutter elements including cutting faces facing in a direction defining a direction of rotation of the drill bit, lateral discharge passages formed in the body, the passages extending radially through the body from the recess and extending longitudinally to the peripheral edge to form circumferential interruptions in the peripheral edge, a convex protrusion disposed centrally at a longitudinally inner end of the recess for deflecting cuttings to the lateral discharge passages, the cutting face including a groove extending in the direction of rotation from one side of an outer end of each bores and terminating at the nearest discharge passage for conducting cuttings from the bore to that passage.

• Assignee: Strata Bit Corp., Houston, TX
• Patent Number(s): US 4640374
• OSTI ID: 7062848
• 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
DRILLING FLUIDS
DRILLS
EQUIPMENT
FLUIDS
MOTION
NATURAL GAS WELLS
NOZZLES
OIL WELLS
OPERATION
PRESSURIZING
ROTARY DRILLS
ROTATION
WELL DRILLING
WELLS