Drill bit and cutter therefor

Patent · Tue Jun 30 04:00:00 EDT 1987

OSTI ID:6209386

Barr, J D; Fuller, J M

This patent describes a full bore drag type well drilling bit comprising: a bit body having an operating end face defining upsets each having a leading edge surface and at least one recess extending through the leading edge surface into the upset, the end face further comprising flow channels, each such leading edge surface having one such flow channel extending along and inset from, and at least some of the upsets having recesses spaced. The bit body further has circulation ports opening through the end face and nozzles. Each nozzle is mounted in a respective one of the ports, the number of such nozzles is less than the number of flow channels extending along the leading edge surfaces of the upsets. Some of the nozzles communicate with more than one flow channel and the minimum transverse crosssectional flow area of each nozzle is less than those of individual ones of the channels communicating; and cutting members each comprising a mounting body and a cutting formation defining a cutting face on the exterior of the mounting body adjacent one end. Each mounting body is mounted in a respective one of the recesses with the cutting face facing outwardly along the leading edge surface of the respective one of the upsets.

• Assignee: NL Industries, Inc., New York, NY
• Patent Number(s): US 4676324
• OSTI ID: 6209386
• 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)
CUTTING TOOLS
DESIGN
DRAG
DRILL BITS
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
NATURAL GAS WELLS
NOZZLES
OIL WELLS
OPERATION
SPACE DEPENDENCE
SURFACES
TOOLS
WELL DRILLING
WELLS