Lip type reversing coupling double-spiral blade type vortex induced vibration restraining device for deep sea vertical pipe

Abstract

The invention provides a lip type reversing coupling double-spiral blade type vortex induced vibration restraining device for a deep sea vertical pipe, comprising a plurality of base modules in combination; the base module comprises a guide shade and a turbulent flow blade; the guide shade is a semi-circular ring-shaped structure, and the inside diameter of the structure is the outside diameter of the vertical pipe; after the base module is unfolded in the peripheral direction, the turbulent flow blade is linearly arranged from the right upper angle of the guide shade to the bottom side middle point place; and gaps are formed at two ends; by viewing in the axial direction, an included angle theta is respectively formed between the head of the turbulent flow blade and a longitudinal axis and between the tail of the turbulent flow blade and a transverse axis of the guide shade; the leftward rotating and rightward rotating base modules are symmetrically installed at the surface of the vertical pipe according to the axial cross section so as to form a basic turbulent flow unit; the turbulent flow units are successively butted end to end along the axis of the vertical pipe; and the butting place of the upper and the lower turbulent flow units is staggered for 180 degrees along the vertical pipe axis. Two sets of turbulent flow blades are symmetrically arranged at two sides of the vertical pipe in a lip-type reversing coupling manner so as to optimize the turbulent flow effect and minimize the influence of the vortex induced vibration on the fatigue life of the vertical pipe.

Description

technical field [0001] The invention relates to a vortex-induced vibration suppressing device for a deep-sea riser. Background technique [0002] The deep sea riser is the only connection structure between the offshore platform (semi-submersible platform, Spar platform, tension leg platform, FPSO, etc.) Uptime is critical to offshore oil and gas production. In riser marine accidents, several major failure forms (fracture, leakage) are closely related to a phenomenon, that is, the vortex induced vibration (VIV) phenomenon. When the ocean current passes through an object with a cylindrical riser structure, alternating vortices will appear on both sides of the rear of the riser, forming a periodic alternating force to act on the riser, so that the riser is consistent and perpendicular to the flow direction of the ocean current Simultaneously vibrate in the direction of the sea current, and the vibration is most severe in the direction perpendicular to the direction of the sea...

AI Technical Summary

Problems solved by technology

However, the cost of the above two devices is relatively high, the weight is relatively large, and the cost performance is low.

There is no experience in deep-sea oilfield development in China, so there is no specific use case of vortex-induced vibration suppression devices for deep-sea risers

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