Secondary release for wellhead connector

Details Secondary release for wellhead connector Secondary release for wellhead connector

2005-11-22

2005-11-22

Neuder, William (Department: 3672)

Wells

Submerged well

Connection or disconnection of submerged members remotely...

C166S345000, C166S368000

Reexamination Certificate

active

06966382

ABSTRACT:
In a subsea wellhead assembly, a connector attaches a production riser or subsea tree to a wellhead housing. The connector includes a piston that cams a plurality of dogs into and out of engagement with the wellhead housing while sliding axially upward and downward relative to the wellhead housing. The piston is typically actuated by injecting hydraulic fluid into either an upper chamber or lower chamber to move the piston axially up or down. While in the axially downward, or locked position, the piston houses an override chamber. Hydraulic fluid is injected into the override chamber to move the piston axially upward and unlock the connector when the seals of the lower chamber fail.

REFERENCES:
patent: 4564068 (1986-01-01), Baugh
patent: 4902044 (1990-02-01), Williams et al.
patent: 6554324 (2003-04-01), Herman
patent: 6557638 (2003-05-01), Cunningham et al.

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