Weight management system and method for marine drilling riser

Details Weight management system and method for marine drilling riser Weight management system and method for marine drilling riser

1997-04-10

1999-03-02

Tsay, Frank S.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166367, E21B 1909

Patent

active

058758488

ABSTRACT:
A system and a method are provided for managing the weight of an underwater riser assembly. The system includes a blocking mechanism for selectively blocking the bottom end of the riser assembly so that heavy drilling mud is retained within the riser assembly. Upper and lower flooding valves are located in the riser assembly above the blocking mechanism and are spaced apart. The valves can be opened so that an annulus in the riser assembly is in fluid communication with surrounding water. Drilling fluid can be introduced to or removed from the annulus during deployment or disconnect conditions using the upper and lower flooding valves. For the blocking mechanism, an elongated cylindrical tool can fill the annulus at the bottom end of the riser assembly to block fluid flow in the annulus.

REFERENCES:
patent: 3815673 (1974-06-01), Bruce et al.
patent: 4495999 (1985-01-01), Sykora
patent: 4557332 (1985-12-01), Denison et al.
patent: 4682913 (1987-07-01), Shatto et al.
patent: 4712620 (1987-12-01), Lim et al.
patent: 5676209 (1997-10-01), Reynolds

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