Floating drilling platform

Details Floating drilling platform Floating drilling platform

1983-06-10

1986-06-24

Corbin, David H.

Boring or penetrating the earth

Boring a submerged formation

114 40, 114265, 405211, 405217, B63B 3508, B63B 3544

Patent

active

045962910

ABSTRACT:
A floating semisubmersible off-shore drilling platform or the like comprises an upper working level portion and a lower pontoon portion. When the platform is transported from one place to another, it floats on the pontoon portion, but when it is working as a stationary unit in open water, it is submerged deeper, so that the pontoon portion is at a considerable distance below the water surface and the working level portion is at a considerable distance above the water surface. The platform is adapted to withstand ice pressure from ice occurring in the ambient water by giving the pontoon portion of the platform a form particularly advantageous in ice conditions. When ice occurs, the platform is lifted to such a position, that its pontoon portion comes to float at the water surface level.

REFERENCES:
patent: 3894504 (1975-07-01), Smith
patent: 4073144 (1978-02-01), Lea
patent: 4295758 (1981-10-01), Yashima
patent: 4434741 (1984-03-01), Wright et al.

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