Converted dual-acting hydraulic drilling jar
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 24, 2000
Grant Date -
N/A
app pub date -
Jan 19, 1999
filing date -
Jul 15, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A jar up, bump down hydraulic drilling jar is described. A hydraulic tripping valve arrangement permits the storage of large amounts of static force before releasing a hammer to strike an anvil surface with substantial force. The hammer is positioned on the mandrel and interacts with the anvil surface in the housing to deliver upward jarring forces, to the drill string. During a downward jarring movement, the tripping valve is opened to prevent pressure buildup and accidental downward jarring; thus, a single-acting drilling jar is formed.
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Cited Art Landscape
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