Hydraulic lock alleviation device, well cementing stage tool, and related methods
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United States of America Patent
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Jun 27, 1989
Grant Date -
N/A
app pub date -
Feb 5, 1988
filing date -
Feb 5, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An hydraulic lock alleviation device a well cementing stage tool with such a device, and related methods for their use. The device has a channel for transmitting trapped fluid which causes a hydraulic lock from the trapped area to another area. The channel is blocked by a pressure responsive member which ruptures, moves, breaks, or is punctured to permit trapped fluid to glow from the area of hydraulic lock. In one embodiment of a stage tool with such a device, a puncture apparatus can be moved to puncture the pressure responsive member. In other embodiments, a movable piston or spool is mounted in the channel for movement to permit the flow of trapped fluid.
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