Enclosed jar tool

Patent · Tue Apr 21 04:00:00 EDT 1987

OSTI ID:6591504

Ring, C P

A jar tool is described comprising: a mandrel adapted for connection to a piece of drill string at one end of the tool; a housing axially movable relative to the mandrel and adapted for connection to the drill string at the opposite end of the tool; first and second pairs of abutment faces between the mandrel and the housing defining jar and bump positions of the tool, respectively, the first and second pairs of abutment faces located in an abutment chamber; a piston slidably located between walls of the mandrel and the housing and having valve means operable to regulate the passage of hydraulic fluid from a first chamber on one side of the piston between the mandrel and the housing to a second chamber on the other side of the piston between the mandrel and the housing, the valve means including passages for permitting the hydraulic fluid to flow through the piston and between the piston and the walls of the mandrel and housing; and sealing means between the housing and mandrel operable to seal the first pair of abutment faces from outside contamination in the abutment chamber and seal the abutment chamber from the first and second chambers, the first and second pairs of abutment faces being enclosed within the jar tool.

• Assignee: Bralorne Resources Limited, Alberta
• Patent Number(s): US 4658917
• OSTI ID: 6591504
• 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
CONTROL EQUIPMENT
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
ELECTRICAL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUIDS
HYDRAULIC FLUIDS
NATURAL GAS WELLS
OIL WELLS
PIPES
PISTONS
POSITIONING
SEALS
VALVES
WELL DRILLING
WELLS
WORKING FLUIDS