Mudline subsea wellhead system

Details Mudline subsea wellhead system Mudline subsea wellhead system

1992-09-08

1993-08-31

Bui, Thuy M.

Boring or penetrating the earth

Boring a submerged formation

Boring from submerged buoyant support

166368, E21B 3300

Patent

active

052400816

ABSTRACT:
A subsea well drilling and completion system allows the use of a jack-up rig for drilling with completion by a floater rig. The system uses an outer wellhead housing which is run on releasable conductor riser. An inner wellhead housing is lowered through the conductor riser and lands in the outer wellhead housing. Cement returns flow through a plurality of cement ports in the outer wellhead housing. A first hanger lands in the inner wellhead housing and supports an intermediate string of casing. The first hanger has a mudline profile in its interior. A second hanger supports a second string of casing and latches into the mudline profile. After drilling, tieback adapters are secured to each hanger for sealing to the inner wellhead housing.

REFERENCES:
patent: 4691781 (1987-09-01), Gano
patent: 4742874 (1988-05-01), Guillon
patent: 4911244 (1990-03-01), Hynes
patent: 5029647 (1991-07-01), Milberger et al.
patent: 5082060 (1992-01-01), Johnson
Vetco Gray, SG-5XP 4-Hanger Wellhead System, VGi 1-155A (Feb. 1990).
Vetco Gray, MLC Mudline Suspension and Tieback System.

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