Hydraulic firing head
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United States of America Patent
Stats
-
Apr 20, 2004
Grant Date -
Apr 3, 2003
app pub date -
Sep 28, 2001
filing date -
Sep 28, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A downhole tool hydraulic firing head includes an automatic drain that is opened when the piston is driven to fire. The automatic drain includes a vent opening from the bore and a sleeve disposed within the bore to move axially with the piston. The sleeve is moveable from a position covering the vent opening to a position clear of the vent opening. A locking collet is disposed between the sleeve and the housing, which locks the sleeve into the position, clear of the vent opening, when the sleeve is moved into that position. This locks the sleeve against returning to the position covering the vent opening when it is urged to move in that direction such as, for example, by venturi forces of the evacuating fluid or by pressure generated from the explosive charges. The firing head is useful to detonate downhole explosive charges, such as those in a perforating gun.
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Cited Art Landscape
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