Wellhead housing seal assembly with backup feature
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United States of America Patent
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Jun 25, 2002
Grant Date -
May 24, 2001
app pub date -
Oct 5, 1998
filing date -
Oct 5, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A tubular connection, an example of which is a subsea wellhead having a primary and secondary seal areas allows the use of a backup or contingency gasket for engagement with the secondary seal area in the wellhead should a failure occur in the primary seal area. In the preferred embodiment, the primary and secondary seal areas are sufficiently separated such that the erosion damage which occurs from leakage with the original gasket adjacent the primary seal area, which can spread below the primary seal area, leaves the secondary seal area unaffected. A backup or contingency gasket can be inserted for sealable contact with the secondary sealing area for further well operations.
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