Split-ring riser latch

Details Split-ring riser latch Split-ring riser latch

1977-04-25

1979-02-06

Stein, Mervin

Pipe joints or couplings

Essential catch

With manipulator

166340, 285 39, 285321, 285DIG21, 285DIG23, 403 15, 403322, E21B 1708, E21B 1916, F16B 2107, F16L 3708

Patent

active

041381483

ABSTRACT:
A latching and unlatching system for connecting a riser pipe to the casing in a subsea well. A split-circumferential ring fits into mating grooves in the male end of the casing and the female end of the riser. A releasing tool runs on a drill pipe suspended within the riser pipe and has a number of radially extendible pistons actuated by hydraulic pressure through the drill pipe to expand the split ring out of the casing groove to the grooved recess of the riser pipe. This releases the riser pipe from connection with the casing so it can then be raised.

REFERENCES:
patent: 2743781 (1956-05-01), Lane
patent: 3193308 (1965-07-01), Todd
patent: 3420148 (1969-01-01), Doerfer et al.
patent: 3640299 (1972-02-01), Nelson
patent: 3929355 (1975-12-01), Sljusar
patent: 3944273 (1976-03-01), Ahlstone

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