Method for disconnecting a marine drilling riser assembly

Details Method for disconnecting a marine drilling riser assembly Method for disconnecting a marine drilling riser assembly

1988-07-14

1990-03-27

Dang, Hoang C.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166359, 166365, 166377, E21B 43013

Patent

active

049112430

ABSTRACT:
Disclosed is a method for disconnecting a marine riser assembly from a subsea wellhead when the marine riser assembly contains substantially gas, the marine riser assembly comprising a riser and a wellhead connector having an internal shoulder for abutting against the top of the subsea wellhead. The method comprises equalizing the pressure acting on the internal shoulder of the wellhead connector and the seawater pressure acting external to the wellhead connector.

REFERENCES:
patent: 3325190 (1967-06-01), Eckert et al.
patent: 3452815 (1969-07-01), Watkins
patent: 3765713 (1972-07-01), Watkins
patent: 4343495 (1982-08-01), Nobilean et al.
patent: 4491345 (1985-01-01), Regan
patent: 4621655 (1986-11-01), Roche
patent: 4696493 (1987-09-01), Brammer
patent: 4719937 (1988-01-01), Roche et al.
Roche, Jr., "Subsea Diverters Handle Shallow Gas Kicks", Ocean Industry, Nov. 1986, pp. 41, 42 and 44.
Erb et al., "Riser Collapse-A Unique Problem in Deep-Water Drilling", IADC/SPE 11394, 1983.

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