Wireline jar

Details Wireline jar Wireline jar

1984-12-20

1986-08-26

Leppink, James A.

Wells

With jar means for releasing stuck part

175299, 175300, E21B 406, E21B 31107

Patent

active

046076921

ABSTRACT:
An upstroke wireline jar having a hammer 12 at the bottom end of an operating rod 3 which is axially slidable in a casing 2 having an anvil 13 at its upper end. This casing also includes a releasable coupling means which is biased downwards by a spring 5 to a rest position, said coupling means comprising a sleeve 4 which receives the rod 3 into its upper end and a plurality of arcuate segments 9 which are contained in apertures in the sleeve and engage in a circumferential groove 10 in the rod. Circumferential recesses 11 and 17 in the interior wall of the casing 2 are adapted to partially receive the segments when the sleeve is in appropriate registration therewith thereby facilitating disconnection and subsequent re-engagement of the operating rod with the sleeve. The spring 5 is mounted below the hammer so as to allow free travel of the latter along a substantial portion of the casing. The spring is provided with an upper abutment 6 mounted on a rod 7 the axial position of which is adjustable from outside the jar. At its bottom end the spring 5 abuts a flanged bush 15 which depends from the sleeve 4. A second spring 6 assists in biasing the sleeve to its rest position.

REFERENCES:
patent: 2621025 (1952-12-01), Denning
patent: 2671640 (1954-03-01), Baker
patent: 3203482 (1965-08-01), Lyles
patent: 4130169 (1978-12-01), Denison
patent: 4142597 (1979-03-01), Johnston
patent: 4333542 (1982-06-01), Taylor
patent: 4494615 (1985-01-01), Jones

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