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US 11,959,350 B2Granted
Release lugs for a jarring device
OwnerRobert W. Evansinventor
Life of this patent
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Abstract
A release mechanism for a jarring tool is formed by a plurality of segmented release lugs. Each lug includes a plurality of axial spaced projections on an inner surface and a plurality of grooves on an outer surface. The projections have either different widths or are separated by varying distances and releaseably engage corresponding grooves in a mandrel located within a housing of the tool. The release lugs are positioned between a trigger sleeve and the mandrel.
Claims15
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.
9 more elements
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.
10 more elements
Dependencies are inferred from the claim text.