Drill bit having a failure indicator

Patent · Tue Aug 25 04:00:00 EDT 1987

OSTI ID:6069767

Daly, J E; Pastusek, P E

This patent describes a drill bit means for use in drilling a well bore comprising: a bit body having a threaded pin at its upper end adapted to be detachably secured to a drill string suspended from a drill rig for rotating the drill bit means, a chamber therein adapted to receive drilling fluid from the drill string, at least one nozzle at the lower end thereof in flow communication with the chamber for exit of the drilling fluid from the bit body to the space between the bit body and the well bore, the drilling fluid in the space being at a relatively low annulus pressure, and at least one depending leg at the lower end thereof having a generally cylindrical bearing journal; a roller cutter of generally conical shape having a recess therein of generally circular section for receiving the bearing journal; bearing means for rotatably mounting the roller cutter on the bearing journal; a lubrication system for providing lubricant to the bearing means.

• Assignee: Reed Tool Co., Houston, TX
• Patent Number(s): US 4688647
• OSTI ID: 6069767
• 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)
BEARINGS
DESIGN
DRILL BITS
DRILLING
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FAILURES
FLUID FLOW
FLUIDS
JOINTS
JOURNAL BEARINGS
LUBRICANTS
NATURAL GAS WELLS
NOZZLES
OIL WELLS
OPERATION
PRESSURE DEPENDENCE
SPACE DEPENDENCE
THREADED JOINTS
WELL DRILLING
WELLS