Subsea pipeline floating ball type flexible washing protection device

Abstract

The invention discloses a subsea pipeline floating ball type flexible washing protection device. The subsea pipeline floating ball type flexible washing protection device is composed of three or more floating ball protection units, wherein each floating ball protection unit comprises a ballasting block body and a floating small ball; the ballasting block bodies and the floating small balls, and the floating small balls are connected by connection ropes; the floating ball protection units are distributed at the periphery of a subsea pipeline to form a protection layer similar with a porous screen plate. The device has lower construction cost and is very convenient to construct; the whole protection device can be directly thrown into water to construct after being positioned under the conditions that the water flow speed is smaller and the water depth is moderate; the volumes of the small balls are slowly expanded and become large under the water under the condition that the water flow speed or the water depth is larger, so that the offset distance of the whole device is reduced; the mounting precision is improved or the construction can be carried out at the position which has a certain distance from a mounting position; the positioned construction is realized under the action of water flow. The method can be used for effectively reducing the water flow speed at the periphery of silt, accelerating the starting speed of the silt, and improving the anti-washing capability of the silt at the periphery.

Description

technical field [0001] The invention belongs to the technical field of submarine pipeline construction and operation, and in particular relates to a partial scour protection device for a submarine pipeline under the action of water flow. Background technique [0002] Submarine pipeline is an important facility for transporting oil and gas resources on the seabed, and its structural safety is an important issue in the development of offshore oil and gas resources. Pipelines laid bare on the seabed often change the local flow field structure at the bottom of the seabed, resulting in three-dimensional eddies and increased water flow turbulence. Such hydrodynamic structures further drive the movement of seabed sediment near the pipeline, especially in sandy and silty seabed, strong sediment movement will quickly form local scour pits around the pipeline. After scour pits distributed unevenly along the pipeline are formed, the pipeline hangs over. When the length of the suspens...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention provides a floating ball type flexible scouring protection device for submarine pipelines, which solves the poor reliabilit

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