Wellhead tieback system with locking dogs

Details Wellhead tieback system with locking dogs Wellhead tieback system with locking dogs

1988-09-27

1990-01-16

Arola, Dave W.

Pipe joints or couplings

With assembly means or feature

Guide and support

285 39, 285315, F16L 3500

Patent

active

048938424

ABSTRACT:
A conductor tieback connector is connected to the lower end of a string of risers and has a downwardly extending funnel that fits over a wellhead. A two-piece internal floating bushing is moved within the interior of the wellhead from an upper position to a lower engaged postion. Locking dogs are pushed outward by an outer ring which is rotated by a running tool. These locking dogs engage grooves in the wellhead. The locking dogs and the wellhead grooves have inclined load shoulders. The dimensions between the abutting surfaces of the wellhead connector and the load shoulders are selected so as to create a preload force.

REFERENCES:
patent: 3489436 (1970-01-01), Ahlstone
patent: 4343495 (1982-08-01), Nobileau et al.
patent: 4372584 (1983-02-01), Miller
patent: 4451056 (1984-05-01), Galle
patent: 4696493 (1987-09-01), Brummer

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