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Arrangement method of vibration suppression device for variable pitch marine riser

A layout method and variable spacing technology, which can be used in drilling pipes, casings, and earth-moving drilling, etc., and can solve the problems of redundant performance, easy fatigue damage, and high cost.

Inactive Publication Date: 2021-05-14
TIANJIN UNIV
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Problems solved by technology

[0003] In recent years, for omnidirectional vortex-induced vibration suppression devices, there are widely used full-coverage schemes or equal-space coverage schemes. These schemes have redundant performance and high cost. Concentration leads to fatigue damage easily, and the drag force load is large, there are problems in economy, safety and efficiency

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  • Arrangement method of vibration suppression device for variable pitch marine riser
  • Arrangement method of vibration suppression device for variable pitch marine riser
  • Arrangement method of vibration suppression device for variable pitch marine riser

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[0048] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] see figure 1 As shown in Fig. 8, the present invention provides a method for arranging vibration suppression devices of variable-pitch marine risers, which is suitable for vibration suppression devices distributed axially symmetrically after installation, which includes the following steps:

[0050] In the first step, according to the actual sea conditions (including but not limited to current velocity, direction, water depth, ocean current characteristics changing with water depth, sea area wave characteristics, etc.), the inherent characteristics of the riser (length-to-diameter ratio, damping, mass ratio, etc.), conduct Vortex-induced vibration (VIV) fatigue analysis, according to the analysis results, determine whether it is neces...

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Abstract

The invention discloses a method for arranging a vibration suppression device of a variable-pitch marine riser, which comprises the steps of: firstly, according to the actual sea conditions and the inherent characteristics of the riser, the vortex-induced vibration fatigue analysis is carried out on the riser, and according to the analysis result, it is determined whether the installation is necessary Suppression device for vortex-induced vibration; in the second step, according to the vortex-induced vibration fatigue damage risk level, vibration amplitude and drag force load of the riser, the riser is divided into high-risk section of fatigue damage, low-risk section, no-risk section and transition Section, and then adopt different preset installation methods to arrange the vibration suppression device, and finally complete the arrangement of the vibration suppression device. The invention divides the axial area of ​​the standpipe into a high-risk section of fatigue damage, a low-risk section, a no-risk section and a transition section, and adopts different spacings to arrange vibration suppression devices in different fatigue damage areas. This arrangement method can ensure the suppression effect of the vibration suppression device on the vortex-induced vibration, and greatly reduce the drag force load on the standpipe.

Description

technical field [0001] The invention relates to the technical field of marine riser laying, in particular to a method for arranging vibration suppression devices of variable pitch marine risers. Background technique [0002] At present, the riser is a connecting pipe used to connect the offshore platform and the subsea wellhead in the deep-sea oil and gas development system. Except that the upper and lower ends of the standpipe are connected and fixed, the rest of the riser does not have any fixing and support. Therefore, when the sea current flows through the surface of the standpipe, at a certain flow rate, vortices are alternately formed on both sides of the standpipe, and the vortex shedding will produce a periodic variable force on the standpipe, causing the standpipe to vibrate in the vertical flow direction. Since the vortex will fall off with the wake of the ocean current fluid flow, when the vortex shedding frequency is close to the natural frequency of the standpi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/01E21B17/10
CPCE21B17/01E21B17/1078
Inventor 张天仪杜尊峰吴俊凌范迪夏
Owner TIANJIN UNIV
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