Drilling fluid bypass for marine riser
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United States of America Patent
Stats
-
Sep 29, 1981
Grant Date -
N/A
app pub date -
Mar 25, 1980
filing date -
Mar 25, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and apparatus are described to reduce the tension required on a riser pipe used in offshore drilling between a floating vessel and a subsea wellhead. Heavy drilling fluid is circulated down a drill pipe and up the annulus between the drill pipe and the borehole wall to a point just above a subsea wellhead. From this point, a separate drilling fluid return conduit extends to the floating vessel. Means are provided to maintain a constant level of an interface between the heavy returning drilling fluid and the lightweight fluid which can be confined within the riser pipe.
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