Guide tube for a flexible upright riser for marine petroleum exp

Details Guide tube for a flexible upright riser for marine petroleum exp Guide tube for a flexible upright riser for marine petroleum exp

1986-06-09

1988-05-03

Reese, Randolph A.

Hydraulic and earth engineering

Marine structure or fabrication thereof

With pivotal connection between work deck and base

405195, E02B 1700

Patent

active

047416475

ABSTRACT:
A stress-limiting device for a flexible riser which stress-limiting device glides in a set of guides rigidly attached to an articulated structure emplaced in the deep sea. The device includes an elastic guide tube element coaxial to the riser, with the stiffness of the guide tube increasing progressively from the top to the bottom of said guide tube, whereby the stiffness characteristic is appreciable in the lower region of the guide tube, which lower region is affixed to a structure attached to a wellhead or the like via an aligned fitting, whereby the guide tube is held in contact with the riser by the intermediary of a plurality of support mechanisms one of which includes a fitted bushing which glides in the lower, rigid part of the guide tube. The device makes it possible to shut down and resume operation of offshore wells which have been equipped for production.

REFERENCES:
patent: 3557564 (1971-01-01), Hauber
patent: 3677016 (1972-07-01), Garrigus
patent: 3739592 (1973-06-01), Plake
patent: 4181453 (1980-01-01), Vache
patent: 4273470 (1981-06-01), Blomsma et al.
patent: 4441839 (1984-04-01), Baduel et al.
patent: 4470723 (1984-09-01), Michel et al.
patent: 4482274 (1984-11-01), Brandi et al.
patent: 4566824 (1986-01-01), Minier et al.

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