Rotatable pentagonal impeller type vortex-induced vibration inhibiting device and method

A pentagonal impeller and vortex-induced vibration technology, which is applied in earthwork drilling, fluid flow, drilling equipment, etc., can solve the problems of limited application range and difficulty in the application of active suppression technology, and achieve the reduction of gravity effect, suppression of vortex-induced vibration, Not easy to corrode and damage the effect

Inactive Publication Date: 2013-12-11
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the complex marine environment, it is still difficult to apply active suppression technology, so more consideration should be given to the use of passive suppression technology
Among them, control rods, surface protrusions, separation discs, etc. are typical passive suppression devices that have been developed, but none of them can deal with incoming flow in any direction, and the actual use range is limited

Method used

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  • Rotatable pentagonal impeller type vortex-induced vibration inhibiting device and method
  • Rotatable pentagonal impeller type vortex-induced vibration inhibiting device and method
  • Rotatable pentagonal impeller type vortex-induced vibration inhibiting device and method

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specific Embodiment

[0026] According to the slenderness ratio of the actual riser 1 and the perennial statistical information of local ocean waves and currents, a reasonable basic unit spacing is designed, and the required number n of basic units is calculated, then the number of pentagonal impellers is n, and the number of cylindrical rollers is n. The number is 16n, and the number of fixed snap rings is 2n.

[0027] When installing a single basic unit, first, set the pentagonal impeller 2 on the riser 1 at a suitable position; then, insert the cylindrical roller 6 into the arc-shaped socket 3 at both ends of the pentagonal impeller 2; The fixed snap ring 5 is installed at both ends, so that the outer end surface of the cylindrical roller 6 is in contact with the inner step end face of the fixed snap ring 5, and the fixed snap ring 5 is fixed by bolt connection; so far, a basic unit has been installed. Subsequently, install the remaining base units in the same installation sequence.

[0028] Af...

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Abstract

The invention discloses a rotatable pentagonal impeller type vortex-induced vibration inhibiting device and method. The device is characterized by consisting of a plurality of basic units. The base units comprise three parts, namely a pentagonal impeller, cylindrical rollers and a fixed snap ring. The pentagonal impeller is sleeved outside a marine riser, two side surfaces at each corner of the impeller are different in shape, and arc-shaped sockets are formed in both ends of the pentagonal impeller, the cylindrical roller are inserted into the arc-shaped sockets and the movement of the pentagonal impeller in the axial direction is limited by installing the fixed snap ring. Under the coordination of the pentagonal impeller and the cylindrical rollers, the pentagonal impeller can freely rotate at 360 degrees to respond incoming flows in different directions and effectively damage the formation of a vortex behind the marine riser, so as to inhibit the vortex-induced vibration.

Description

technical field [0001] The invention belongs to the technical field of laying marine riser facilities, and in particular relates to a rotatable pentagonal impeller type vortex-induced vibration suppression device and method. Background technique [0002] During the exploitation of deepwater oil and gas fields, the marine riser connects the platform and the underwater wellhead to provide a safe channel for drilling fluid and formation fluid. The reliability of its service is of great significance to the safe operation of oil and gas drilling and production. The marine riser is located in harsh environmental conditions and the stress situation is complex. When waves and currents flow through the riser, a vortex will be formed behind the riser. The formation and shedding of the vortex changes the flow velocity distribution behind the riser and induces vortex-induced vibration of the riser. When the vortex shedding frequency is close to or equal to a certain natural frequency o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10F15D1/00
Inventor 朱红钧赵洪南林元华冯光刘清友马粤戚兴韩青华潘倩
Owner SOUTHWEST PETROLEUM UNIV
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