a semi-submersible platform

Abstract

The invention discloses a semi-submersible platform, which is mainly suitable for floating offshore oil and gas production platforms, drilling and workover platforms, or living support platforms that do not require high oil storage capacity. The base pontoon floating on the sea is vertically distributed with columns and deck boxes in sequence. The base pontoon, column and deck box are connected as a whole and form a through hole communicating with seawater in the vertical direction. Pool, the semi-submersible platform of the present invention adopts an integral structure, which effectively avoids the air gap problem existing in the conventional column-type semi-submersible platform, can reduce the height of the column, reduce the weight of the platform and the height of the center of gravity, and improve the stability of the semi-submersible platform. The cross-sectional area of ​​the column along the horizontal direction is smaller than the area of ​​any cross-section of the deck box along the horizontal direction. The deck box with the floating design increases the area of ​​the top of the deck box and changes the direction of wave climbing. The large-volume base pontoon further improves the semi-submersible platform. stability.

Description

technical field [0001] The invention relates to a semi-submersible platform, which relates to the field of semi-submersible platforms of marine engineering. Background technique [0002] With the continuous development of deep-sea oil and gas fields, the traditional gravity platform and jacket platform can no longer meet the requirements of deep-sea oil and gas development because of their dead weight and cost increase with the increase of water depth. They have been replaced by floating production systems. At present, the semi-submersible platform is widely used in the field of ocean engineering. Because of its good seakeeping performance, small motion response, wide working water depth range, strong wind and wave resistance, large deck area and strong loading capacity, it can be used as an offshore drilling platform, Oil and gas production platforms and life support platforms, etc. [0003] Conventional semi-submersible platforms usually use bottom pontoons and several co...

AI Technical Summary

Problems solved by technology

Taller columns and wider column spacing will further increase the overall weight of the platform

[0005] At the same time, due to the small cross-sectional area of ​​the column, for the construction site with limited water depth of the wharf and channel, in order to obtain a smaller draft of the empty ship, it is necessary to increase the aspect ratio of the bottom pontoon, which will bring about the structural fatigue of the bottom pontoon

[0006] In addition, for semi-submersible platforms using large integral truss-type modules, it poses a challenge to the resources of large-scale module hoisting or float-over installation during the construction process, and the cost is often high due to single resources

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