Floating drilling platform

Details Floating drilling platform Floating drilling platform

1985-12-23

1988-01-05

Corbin, David H.

Boring or penetrating the earth

Boring a submerged formation

Boring from submerged buoyant support

114265, 405201, 405211, 405217, B63B 3544

Patent

active

047169729

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: 3474629 (1969-10-01), Woodson
patent: 3872814 (1975-03-01), Rodriguez
patent: 3894503 (1975-07-01), McClure
patent: 3894504 (1975-07-01), Smith
patent: 4073144 (1978-02-01), Lea
patent: 4295758 (1981-10-01), Yashima
patent: 4434741 (1984-03-01), Wright

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