Drilling fluid bypass for marine riser

Details Drilling fluid bypass for marine riser Drilling fluid bypass for marine riser

E - Fixed Constructions

21

B

166/51.4

E21B 7/12 (2006.01) E21B 21/00 (2006.01) E21B 21/08 (2006.01)

Patent

CA 1147646

ABSTRACT OF THE DISCLOSURE 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 con- stant level of an interface between the heavy returning drilling fluid and the lightweight fluid which can be con- fined within the riser pipe. JDG:mk 80072ART0051

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