Wells – With jar means for releasing stuck part
Patent
1988-09-09
1989-09-12
Novosad, Stephen J.
Wells
With jar means for releasing stuck part
175297, 175299, E21B 414
Patent
active
048651257
ABSTRACT:
A hydraulic well jar mechanism capable of developing jarring force in an upwardly or downwardly direction or in both upward and downward directions for imparting jarring forces to stuck well pipe. Inner and outer tubular members cooperate to define an annulus therebetween, which annulus contains a volume of metering liquid such as oil. One or more metering valves are disposed within the annulus and establish metering of the metering liquid during a portion of the stroke of the well jar to thus retard movement thereof. After a certain metering movement has occurred, the operative metering valve will be clear of the metering surface and the jar mechanism will then have relatively free movment from the retarded position to the jarring position. Closing movement of the jar mechanism may be induced by a compression spring closure. The metering fluid within the annulus is balanced with well pressure while separated from well fluid by means of a floating piston disposed within the annulus and having sealed relation with both the inner and outer tubular members. The inner tubular member defines a central passage permitting insertion therethrough of well servicing tools, well fluid, etc.
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Crawford Douglas W.
Novosad Stephen J.
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