Drill bits with cone retention means

Patent · Tue Apr 14 04:00:00 EDT 1987

OSTI ID:6469263

Higdon, R

A drill bit is described comprising: a body having an upper end for connection to a rotary drilling string and legs depending from its lower end, a journal bearing extending inwardly from each leg, a cone fittable over the end of each bearing for rotation thereabout, means forming a chamber between the walls of each bearing and cone, a liquid filling the chamber from which air has been displaced, and means seating the chamber, the sealing means including means on the cone and the hournal bearing sealing therebetween, the chamber being sealed to prevent leakage of air in or liquid out of the chamber to form a liquid lock which holds the cone on the bearing while permitting relative rotary movement between the cone and bearing and preventing any substantially longitudinal movement between the cone and bearing.

• Assignee: NOV; EDB-87-101359; NOV-87-059077
• Patent Number(s): US 4657091
• OSTI ID: 6469263
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
AIR FLOW
BEARINGS
DESIGN
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FLUID FLOW
GAS FLOW
JOURNAL BEARINGS
LIQUID FLOW
MOTION
NATURAL GAS WELLS
OIL WELLS
OPERATION
PIPES
ROTARY DRILLING
ROTATION
SEALS
WALLS
WELLS