Platform Moon Pool Drag Reduction Device

Abstract

The invention discloses a platform moon pool damping device which comprises a shock absorption cabin and a shake absorption cabin which are arranged on the transverse inner walls at the two ends of a moon pool and separated through a watertight separation board. Multiple rows of damping blocks distributed in a staggered manner are transversely arranged on the outer wall of the shock absorption cabin and the outer wall of the lower portion of the shake absorption cabin respectively. Multiple wave stop columns are arranged on the outer wall of the lower portion of the shake absorption cabin. Three separation boards are arranged in the shake absorption cabin from top to bottom. Multiple rows of vertical wave elimination blocks horizontally distributed in a staggered manner are transversely arranged on the upper sides and the lower sides of the separation boards and the inner wall of the shake absorption cabin bottom. The separation boards are provided with vertically-corresponding wedge blocks towards the outer end of the platform moon pool. Multiple rectangular openings are formed in the shock absorption cabin outer wall and a vertical wall board of the shock absorption cabin respectively. Multiple rows of horizontal wave elimination blocks vertically distributed in a staggered manner are transversely arranged on the inner walls of the two longitudinal ends and a vertical wall board of the moon pool. The shock absorption cabin and the shake absorption cabin can guarantee that a platform works safely and stably under different working conditions. The wave stop columns arranged on the outer wall of the lower portion of the shake absorption cabin can effectively resist incoming flow impact, the kinetic energy of waves is weakened, incoming flow is inducted to move towards the bottom of the moon pool, and formed vortexes in the moon pool are reduced.

Description

technical field [0001] The invention relates to a device for reducing the influence of resistance of marine engineering structures, in particular to a device for reducing liquid surface oscillation, sloshing and vortices of a drilling platform moon pool under different working conditions, and belongs to the technical field of ships and marine engineering. Background technique [0002] With the increase of human demand for oil and natural gas energy, the development of land resources can no longer meet the existing oil supply. Offshore oil exploration and development are urgently needed. Various new types of marine equipment are constantly emerging under this new situation. As the main product of offshore drilling equipment, the drilling platform is also constantly developing and innovating. Moon pool, as an indispensable structural form of offshore drilling platform, is generally located in the middle of the platform. Its structure is a vertical channel from the upper splint...

AI Technical Summary

Problems solved by technology

Because the inner wall of the moon pool at the bottom of the platform is in direct contact with the incoming waves, the vortex generated at the front of the moon pool is transported to the rear end, and when it hits the back wall of the moon pool, it is blocked and sent back to the inside of the moon pool, causing the fluid in the moon pool to roll, and the back wall of the moon pool The pressure on the front wall is higher, thus generating resistance; at the same time, under the action of wind, waves and currents, the free liquid surface in the moon pool will form an up and down "piston" movement along the depth direction of the moon pool and a "sloshing" movement in the horizontal direction, which will affect the inner surface of the moon pool. impact on the wall and deck, which affects the movement posture of the main body of the platform in seawater, and has a serious impact on the working and resting environment at sea

[0003] At present, in order to cope with the adverse effects of the moon pool, it is generally used to add appendages on the inner wall or bottom of the moon pool and to add movable panels that can be opened and closed in the moon pool. These measures can reduce part of the resistance to a certain extent, but due to the When working at sea, it is necessary to deal with the influence of resistance under different working conditions. The existing technical solutions cannot fully meet the requirements of drag reduction for the moon pool structure. Moreover, for movable opening and closing plates, hydraulic cylinder push-pull methods are generally used to drive the plates. Movement, the hydraulic cylinder device is susceptible to seawater immersion corrosion, which increases the airtightness requirements and also brings a lot of inconvenience in operation

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