Mechanical well jar

Patent · Tue May 19 04:00:00 EDT 1987

OSTI ID:6533310

Burton, C A

This patent describes a mechanical well jar having inner and outer tubular members movable longitudinally relative to each other a limited distance. Means for connecting one of the members to a pipe string extends above the jar. Means connect the other member to the pipe string below the jar. Annular shoulders on the members engage to limit the relative longitudinal movement of the members. The improvement comprises: laterally spaced, arcuate cam plates each attached to the inner surface of the outer member by threaded members that extend through the wall of the outer member and that can be removed from outside the outer member to allow the cam plates to be removed and repaired or replaced.

• Assignee: Eastman Whipstock, Inc., Houston, TX
• Patent Number(s): US 4665998
• OSTI ID: 6533310
• 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)
CONDUCTOR DEVICES
CONNECTORS
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
ELECTRICAL EQUIPMENT
EQUIPMENT
FASTENERS
JOINTS
MACHINE PARTS
MECHANICAL STRUCTURES
MOTION
NATURAL GAS WELLS
OIL WELLS
PIPES
PLATES
ROTATION
SHAFTS
SPACE DEPENDENCE
SUPPORTS
THREADED JOINTS
TUBES
WELL DRILLING
WELLS