Fluid retarded accelerating jar with negative and positive pressure chambers
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 29, 1980
Grant Date -
N/A
app pub date -
Mar 3, 1978
filing date -
Mar 3, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic drilling jar apparatus having axially elongated outer housing and inner mandrel members that telescope relative to each other when tripped by a predetermined axial force applied to the mandrel to deliver an impact blow to an object stuck in a well bore. A negative pressure is developed within the apparatus during initial retarded telescoping movement to effect acceleration of the mandrel member upon release at a rate exceeding the acceleration rate otherwise imposed by the axial force.
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