Subsea riser for multiple bore wells

Details Subsea riser for multiple bore wells Subsea riser for multiple bore wells

1987-05-07

1988-09-13

Novosad, Stephen J.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166359, E21B 712

Patent

active

047702478

ABSTRACT:
An improved riser for a multiple bore subsea well providing wireline access to each of the bores through a single opening at the upper end of the riser and including an upper tubular member having a single bore, a tubular housing surrounding the lower portion of said upper tubular member, bearing means within said tubular housing for supporting rotation of said upper tubular member with respect to said tubular housing, a lower housing member having multiple bores which mate with the multiple bores of the tubing hanger running tool or the christmas tree running tool, said upper tubular member having an offset portion within said tubular housing which, when rotated can align with the opening of the upper end of the bores through said lower housing member, means securing the lower end of said tubular housing to said lower housing member, a skirt connected to said upper tubular member within said tubular housing and extending into sealing engagement with said lower housing member and being in surrounding relation to said offset portion of said upper tubular member, means for stopping the rotation of said upper tubular member in positions of alignment with the bores of said lower housing member, and means for providing an indication to the upper end of said upper tubular member of the position of the tubular member with respect to said lower housing bores.

REFERENCES:
patent: 4167215 (1979-09-01), Thorne
patent: 4284142 (1981-08-01), Kirkland
patent: 4291724 (1981-09-01), Miller
patent: 4319637 (1982-03-01), Wilson
patent: 4474236 (1984-10-01), Kellett

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