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

Claim 7:
8. A method of freeing a downhole tool lodged in a well, comprising:
providing a tubular string including the downhole tool and a jarring tool, 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 arcuate 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 arcuate release lugs; and
an actuating piston comprising a restrictor orifice and one or more check valves;

deploying the tubular string in a wellbore;
supplying a force to the tubular string upon the downhole tool becoming lodged in the wellbore, thereby transferring a supplied force to the jarring tool;
converting the supplied force to a jarring force by the jarring tool; and
freeing the downhole tool.