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Device and method for inhibiting vortex-induced vibration of spiral strake with rotating blade

A technology of spiral strakes and suppression devices, which is applied in earthwork drilling, fluid flow, and reduction of ship motion, can solve the problems of vortex-induced vibration suppression effect to be further improved, increase riser drag force, etc., and achieve the best suppression effect , low-cost effect

Inactive Publication Date: 2014-01-01
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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Problems solved by technology

The helical strake suppression device is mainly composed of three helical strakes spirally rising around the surface of the riser, which greatly changes the smooth cylindrical shape of the marine riser, but the existence of the helical strake increases the drag force of the riser. A greater longitudinal load is caused, and some smooth cylinders are still exposed to the sea current between the spiral strakes, and the vortex-induced vibration suppression effect needs to be further improved

Method used

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  • Device and method for inhibiting vortex-induced vibration of spiral strake with rotating blade
  • Device and method for inhibiting vortex-induced vibration of spiral strake with rotating blade
  • Device and method for inhibiting vortex-induced vibration of spiral strake with rotating blade

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specific Embodiment

[0026] According to the slenderness ratio of the actual marine riser and the perennial statistical information of local ocean waves and currents, a reasonable basic unit spacing is designed, and the required number of basic units n is calculated, that is, the sleeve with the spiral strake 2 and the support 3 The number of 1 is n, the number of 4 blades is 6n, the number of 6 screws and 7 nuts is 3n.

[0027] When installing a single basic unit, first set the sleeve 1 and fix it at a suitable position on the standpipe, then take two blades 4 and place them between the supports 3 on the same vertical line, and make the blade shaft holes 5 and the supports The shaft holes of 3 are aligned, and the screw rod 6 passes through the shaft holes of the three supports 3 on the vertical line and the blade shaft holes 5 of the two blades 4 between the three supports 3 from top to bottom, and the screw thread at one end of the screw rod 6 It is fixed by the engagement of nut 7. So far, th...

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Abstract

The invention relates to a device and a method for inhibiting vortex-induced vibration of a spiral strake with rotating blades. The device for inhibiting vortex-induced vibration of the spiral strake with the rotating blades is characterized by being combined by multiple basic units, and each basic unit is composed of a sleeve, spiral strakes and blades; three spiral strakes are arranged on the outer surface of the sleeve and are uniformly distributed in 120 degrees, each spiral strake rotates around the sleeve for one circle, and six blades which can rotate freely are mounted on three vertical lines in the circumferential direction of the outer side of the sleeve; under the action of ocean current, the blades are driven to rotate, and a streaming boundary layer of a vertical pipe is destroyed; under the combined action of the spiral strakes and the blades, a streaming flow field of the vertical pipe is fundamentally destroyed, so that a vortex-induced vibration inhibiting effect is improved. The device for inhibiting vortex-induced vibration of the spiral strake with the rotating blades is processed by plastic, low in cost and resistant to corrosion and can be repeatedly used.

Description

technical field [0001] The invention belongs to the technical field of laying marine riser facilities, and in particular relates to a device and method for suppressing vortex-induced vibration of a spiral strake with rotating blades. Background technique [0002] With the increasing demand for oil, people have turned their attention to the deep sea rich in oil and gas, and the development and exploitation of deep sea oil and gas has become a key way to solve the current energy crisis. The marine riser is the "life channel" for deep-sea oil and gas exploitation. It connects the subsea wellhead and the offshore platform, and provides a channel for the lifting of oil and gas. Its safe service is the fundamental guarantee for deep-sea oil and gas exploitation. However, the ocean environment is harsh, and waves and currents constantly impact the riser. Especially when the water flows through the riser, vortices that alternately fall off will be generated due to the uneven pressur...

Claims

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Application Information

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IPC IPC(8): E21B17/10F15D1/00
CPCB63B21/502B63B39/005B63B2021/504E21B17/01F16L1/123
Inventor 朱红钧马粤林元华冯光赵洪南刘清友戚兴韩青华潘倩
Owner SOUTHWEST PETROLEUM UNIV
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