Spar system
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United States of America Patent
Stats
-
Apr 3, 2001
Grant Date -
N/A
app pub date -
Jan 21, 1999
filing date -
Feb 12, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An offshore hydrocarbon production system includes a spar (34, 52, 214) that floats at the sea surface, a subsea buoy (26, 154, 200, 210) lying under the spar and hanging from it, and one or more risers (20, 174, 220) that extend up to the subsea buoy and are coupled therethrough to the spar. The subsea buoy is initially negatively buoyant to ballast of the spar and keep it upright, but the subsea buoy can be made positively buoyant so the spar can be moved away and a workover vessel (70) moved over the subsea buoy. The subsea buoy can be coupled to the spar by one or more chains (60, 60A) extending between them, and one or more flexible hoses (60) extending between them.
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