Method and apparatus for connecting a tubular element to an unde

Details Method and apparatus for connecting a tubular element to an unde Method and apparatus for connecting a tubular element to an unde

1985-07-30

1987-01-13

Leppink, James A.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166345, 285 24, 285330, E21B 43013

Patent

active

046357289

ABSTRACT:
A method and apparatus for connecting a tubular element to an underwater wellhead. A wellhead extension having a threaded lower end is threadably connected to an underwater wellhead. A stinger connected to a lower end of a string of riser pipe is lowered into the wellhead extension until the riser pipe is sealably connected to the extension spool. In the event of damage to the hanger threads, a housing is mounted on the lower end of a string of riser pipe or a wellhead extension. A substantially tubular nut is threadably engaged with the housing and includes a set of downwardly-projecting lugs on the lower end of the nut. On the lower portion of the housing, a set of slips and an annular seal are mounted. The housing is lowered until the lugs are engaged with flow-by ports in the wellhead hanger. Rotation of the pipe effects longitudinal housing movement relative to the nut which sets the slips thereby joining the housing to the hanger, and energizes the seal between the wellhead and the housing.

REFERENCES:
patent: 3025912 (1962-03-01), Schramm et al.
patent: 3032125 (1962-05-01), Hiser et al.
patent: 3248135 (1966-04-01), Meripol
patent: 3256937 (1966-06-01), Haeber et al.
patent: 3287030 (1966-11-01), Crain et al.
patent: 3288493 (1966-11-01), Brown
patent: 3353847 (1967-11-01), Brown
patent: 4343493 (1982-08-01), Nobilean et al.

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