Hydraulic and earth engineering – Marine structure or fabrication thereof – With pivotal connection between work deck and base
Patent
1982-09-17
1984-04-10
Corbin, David H.
Hydraulic and earth engineering
Marine structure or fabrication thereof
With pivotal connection between work deck and base
166367, E02B 1702
Patent
active
044418396
ABSTRACT:
An arrangement for supporting a well pipe emerging from the sea bottom adjacent a drilling platform which is articulated on a base by means of a universal joint, the base being mounted on the sea bottom adjacent the point where the well pipe emerges. A second base surrounds the portion of the well pipe emerging from the sea bottom, and supports a cylindrical seat by means of a universal joint at a point vertically aligned with the well pipe and horizontally aligned with the universal joint which supports the drilling platform. The upper part of the cylindrical seat surrounds the well pipe in such a manner that the well pipe can slide longitudinally within the seat. A generally horizontal arm is articulated at one end to the drilling platform at a point vertically above the universal joint which supports the platform. The other end of the arm is articulated to the upper part of the cylindrical seat at a point aligned with the well pipe, so that the articulations of the arm, the universal joint which supports the drilling platform, and the universal joint which supports the cylindrical seat define the vertices of a parallelogram. The universal joint which supports the cylindrical seat is disposed midway between the sea bottom and the upper part of the cylindrical seat to which an end of the arm is articulated. With this arrangement, bending stresses on the portion of the well pipe emerging from the sea bottom resulting from pivoting of the drilling platform on its supporting universal joint, are maintained at approximately the same level as if the well pipe coincided with the central vertical axis of the drilling platform.
REFERENCES:
patent: 3677016 (1972-07-01), Garrigus
patent: 3690108 (1972-09-01), Tam
patent: 4273470 (1981-06-01), Blomsma et al.
patent: 4326312 (1982-04-01), Tang
Baduel Francois
Dumazy Christian
Sarrailh Jean-Paul
Corbin David H.
Societe Nationale Elf Aquitaine
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