Offshore oil-gas subsea pipeline protection device

Abstract

The invention provides an offshore oil-gas subsea pipeline protection device. The device comprises a trapezoidal long frame, bionic waterweeds, a U-shaped pile, rolling assemblies and a cathode protection assembly, the top of the trapezoidal long frame is fixedly connected with the U-shaped pile through a second transverse frame, a pillow plate is arranged in the trapezoidal long frame, a set of guide rails are installed on the pillow plate, and an arch-shaped plate is fixedly connected to the guide rails. The bionic waterweeds are installed on a seabed, first transverse frames are installed at the two sides of the U-shaped pile, and the first transverse frames are fixedly connected with the two side edges of the arch-shaped plate through damping pieces. Pipelines are fixedly connected with each other through a flexible pipe, a pair of rolling assemblies are arranged in the flexible pipe, each rolling assembly comprises a ball and a sleeve, the sleeves are rotatably connected with theflexible pipe through the balls and pipe inner cavities, and the cathode protection assembly is fixed in the pipelines through a mounting plate. The device is suitable for protecting the offshore oil-gas subsea pipelines, scouring of water flow to the pipelines can be effectively reduced, eddy current oscillation is reduced, and chemical corrosion and the heat effect in the pipelines can be resisted.

Description

technical field [0001] The invention relates to the technical field of submarine pipeline protection, in particular to an offshore oil and gas submarine pipeline protection device. Background technique [0002] The role and influence of ocean currents on pipelines is particularly important. In the scouring effect of ocean currents on pipeline foundations, the size of the bottom flow velocity is an important hydrodynamic factor. Resistance to bottom flow velocity erosion is a key design factor for protecting the foundation soil of the pipeline. The foundation soil is scoured. It will cause the entire pipeline system to be at risk of instability; most submarine pipelines are made of steel pipes, and the environment in which they are located is seawater or seabed sediments, which is a very strong corrosive environment. When the pipeline passes through the uneven seabed, it will cause suspension and bending stress in the pipeline. When the pipeline is suspended in the air, it wi...

AI Technical Summary

Problems solved by technology

When the pipeline passes through the uneven seabed, it will cause suspension and bending stress in the pipeline. When the pipeline is suspended in the air, it will cause resonance instability due to vortex vibration, resulting in excessive stress concentration and damage to the pipeline. Moreover, when the pipeline transports high-temperature fluid Thermal gradients will be generated in the pipeline, resulting in expansion and contraction of the pipeline, resulting in buckling, movement and loading of the entire pipeline, which may cause fatigue damage in relatively fragile parts of the pipeline, and even pipeline leakage, causing irreparable losses

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