Wells – With jar means for releasing stuck part
Patent
1982-01-15
1983-08-30
Novosad, Stephen J.
Wells
With jar means for releasing stuck part
175300, 166301, E21B 1700, E21B 31107
Patent
active
044011610
ABSTRACT:
An oil well tool retrieving device in the form of a jar is provided having a hollow casing including a downwardly facing impact surface, a hammer of cylindrical construction slidably engaging an inner surface of the casing and impacting with the impact surface in one direction and an upwardly facing casing impact surface in the other, a mandrel of cylindrical construction from which the hammer is supported slidably engaging an inner surface of the casing, a double track raceway formed in and extending along a length of the mandrel, resiliently mounted bearing elements supported from the casing and for engaging the double track raceway and a hump element mounted in one of the tracks of the double track raceway while the other track is a free raceway. The arrangement may be used to release and retrieve oil well tools by impact of the hammer on the upwardly facing casing surface during free fall of a sucker rod in a downward direction as bearing elements follow the free raceways and by impact of the hammer against the impact surface of the casing when the mandrel is suddenly released by the bearing elements passing over the hump elements during movement of the sucker rod in an upward direction.
REFERENCES:
patent: 1989907 (1935-02-01), Beck
patent: 2005228 (1935-06-01), Kammerdiner
patent: 2158406 (1939-05-01), Collett et al.
patent: 2733046 (1956-01-01), Thompson
patent: 4047568 (1977-09-01), Aulenbacher
Falk Joseph
Jacobson Harvey B.
Novosad Stephen J.
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