Patent ID: 11959350
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A system for freeing a downhole tool lodged in a well, comprising:
the downhole tool;
a tubular string including the downhole tool; and
a jarring tool disposed on the tubular string, the jarring tool comprising:
a housing,
a mandrel adapted for longitudinal movement within the housing and having a plurality of axially spaced grooves on an outer surface of the mandrel;
an annular trigger sleeve surrounding the mandrel;
a plurality of arcuate release lugs positioned between the annular trigger sleeve and the mandrel, each release lug comprising an inner surface having a plurality of axially spaced projections and an outer surface having a plurality of grooves;
one or more springs surrounding and in contact with the release lugs; and
an actuating piston comprising a restrictor orifice and one or more check valves;

wherein upon the downhole tool becoming lodged in the wellbore, the jarring tool is configured to convert a force supplied to the tubular string to a jarring force which frees the downhole tool.