Full bore nipple and associated lock mandrel therefor
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United States of America Patent
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-
Feb 2, 1999
Grant Date -
N/A
app pub date -
Feb 11, 1997
filing date -
Feb 11, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved full bore nipple and associated lock mandrel provides enhanced sealing capability in tubing strings positioned in subterranean wells. In a described embodiment of the full bore nipple, a nipple body has a recessed seal surface and a latch profile formed on an internal bore of the body. In a described embodiment of the lock mandrel, an expander sleeve radially outwardly expands a circumferential seal to sealingly engage the recessed seal surface, locks a series of keys into the latch profile, and displaces another seal to sealingly engage an outer housing, when the expander sleeve is displaced axially downward relative to an inner mandrel of the lock mandrel.
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