Downhole drilling tool with improved swivel

Patent · Tue Sep 23 04:00:00 EDT 1986

OSTI ID:5061543

Pittman, P R; Scott, Jr, F L; Hamilton, W R

A swivel for use with a downhole well drilling motor, the swivel comprising; a tubular stem adapted to be connected to a drill string; a tubular housing, mounted concentrically and rotatably on the stem, forming an annular space between the housing and the stem, the housing being adapted to connect to the downhole well drilling motor; bearing means within the annular space for supporting the housing against radial and longitudinal thrust loads; seal means within the annular space, above and below the bearing means, for forming a lubricant chamber, the housing having a cylindrical lubricant passage; and a cylindrical piston scalably slidable within the lubricant passage in response to pressure of drilling fluid entering the lubricant passage from the annular space to force lubricant out of the passage and into the chamber in order to replace lubricant which is lost therefrom.

• Assignee: Hughes Tool Co., Houston, TX
• Patent Number(s): US 4613002
• OSTI ID: 5061543
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ANNULAR SPACE
CONFIGURATION
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FLUIDS
LUBRICANTS
MECHANICAL STRUCTURES
MOTION
MOTORS
NATURAL GAS WELLS
OIL WELLS
PIPES
PISTONS
PRESSURE EFFECTS
ROTATION
SEALS
SPACE
SUPPORTS
WELL DRILLING
WELLS