Apparatus for connecting jars to a downhole tool

Details Apparatus for connecting jars to a downhole tool Apparatus for connecting jars to a downhole tool

1987-05-06

1988-08-09

Massie, Jerome

Wells

With explosive or gas generating means in well

166178, E21B 31107

Patent

active

047621753

ABSTRACT:
Apparatus is disclosed for connecting the firing head of a downhole tool to a set of jars to allow the jars to jar up and jar down. The apparatus includes a firing head housing, a hammer located in the housing, and a spring urging the hammer toward a firing pin. A mandrel extends into the housing. It has one end connected to a jar and the other end connected to the hammer by a shear pin. The mandrel also has longitudinally spaced oppositely facing shoulders and one or more lock segments around the mandrel between the shoulders. The movement of the lock segments along the axis of the housing is limited and the lock segments engage the oppositely facing shoulders to limit axial movement of the mandrel relative to the housing in either direction when the pin is sheared and the hammer released to strike the firing pin.

REFERENCES:
patent: 2637402 (1953-05-01), Baker et al.
patent: 3211222 (1965-10-01), Myers
patent: 3244232 (1966-04-01), Myers
patent: 3343606 (1967-09-01), Dollison

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