Underbalanced marine drilling riser
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 3, 2007
Grant Date -
Feb 2, 2006
app pub date -
Jul 28, 2004
filing date -
Jul 28, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A riser assembly for offshore drilling has an inner conduit suspended within an outer riser. A seal assembly seals an annular space between the inner conduit and the riser at the lower end of the inner conduit. The seal assembly has a pressure area that is independent of the inner conduit, so that any forces acting on the assembly due to pressure in the annulus below the seal assembly pass through the assembly to the riser and not to the inner conduit.
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