Buoyancy block surface structure for reducing ocean current resistance borne by waterproof pipe column

A technology of surface structure and buoyancy block, applied in the direction of drill pipe, casing, fluid flow, etc., can solve the problems of unfavorable compactness of self-weight structure, additional addition, etc., to reduce vortex-induced vibration, reduce the reaction force of connecting support, and reduce The effect of small ocean current resistance

Inactive Publication Date: 2015-03-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They all have a common disadvantage that they all need to add additional components to the riser string, which is ver

Method used

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  • Buoyancy block surface structure for reducing ocean current resistance borne by waterproof pipe column
  • Buoyancy block surface structure for reducing ocean current resistance borne by waterproof pipe column
  • Buoyancy block surface structure for reducing ocean current resistance borne by waterproof pipe column

Examples

Experimental program
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Effect test

Embodiment 1

[0044] according to image 3 , the surface structure of the buoyancy block 1 is a triangular groove; the outer diameter D of the buoyancy block 1 is taken as 1m, here the outer contour of the buoyancy block 1 attached to the riser string is approximately a cylindrical surface, the groove width d=0.007Dmm, the groove Groove depth h=0.005D=5mm; under the Reynolds number Re=40000, carry out water tunnel numerical simulation on the smooth structure and the buoyancy block 1 under this triangular structure, and track the pressure difference resistance coefficient, and intercept the stable A piece of data is made into a line chart; Figure 16 is the line diagram of pressure differential resistance coefficient Cd under smooth structure, Figure 17 It is a broken line diagram of the pressure difference resistance coefficient Cd under the triangular groove structure, and the average value is respectively calculated as Cd=1.141 under the smooth surface, and Cd=0.827 under the triangular...

Embodiment 2

[0046] according to Figure 4 , the surface structure of the buoyancy block 1 is an arc-shaped groove; the outer diameter D of the buoyancy block 1 is taken as 1m, and the outer contour of the buoyancy block 1 attached to the riser string is approximated as a cylindrical surface, and the groove width d=0.07D =70mm, groove depth h=0.01D=10mm; carry out water tunnel numerical simulation on the buoyancy block 1 of this structure under the Reynolds number Re=40000; same as Example 1, obtain the pressure difference resistance coefficient Cd under this arc-shaped structure line chart, such as Figure 18 , find the average value of Cd=0.872 under the circular arc groove structure, so the pressure difference resistance coefficient Cd of this circular arc groove structure is 23.5% lower than that of the smooth surface structure.

Embodiment 3

[0048] according to Figure 13 , the surface structure of the buoyancy block 1 is a diamond-shaped distribution of circular pits; the outer diameter D of the buoyancy block 1 is 1m, and the outer contour of the buoyancy block 1 attached to the riser string is approximated as a cylindrical surface, and the width of the pits is d=0.1D=100mm, groove depth h=0.0.01D=10mm, distance s=0.003D=3mm between two dimples along the axis direction; numerical simulation of water tunnel is carried out at Reynolds number Re=40000, same as the embodiment 1. Obtain the broken line diagram of the pressure difference resistance coefficient Cd under the circular pit structure with diamond distribution, as shown in Figure 19 , find the average value of Cd=0.928 under the circular dimple structure with rhombus distribution, then, the pressure difference resistance coefficient Cd of the circular dimple structure with rhombus distribution is 18.7% lower than that of the smooth surface structure.

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Abstract

The invention discloses a buoyancy block surface structure for reducing ocean current resistance borne by a waterproof pipe column. The buoyancy block surface structure comprises a buoyancy block (1) of the waterproof pipe column. The external diameter D of the buoyancy block (1) ranges from 0.9144 m to 1.397 m. Multiple triangular grooves (2) are formed in the column face of the buoyancy block (1) in the length direction of the buoyancy block and evenly distributed in the circumferential direction of the buoyancy block (1). The depth h of each triangular groove (2) is (0.01 to 0.03) D, the width d of each triangular groove (2) is (0.05 to 0.1) D, and the number n of the triangular grooves (2) ranges from 15 to 30. The buoyancy block surface structure has the advantages that the ocean current resistance borne by the waterproof pipe column is reduced, so that connection bearing reaction of the end of the waterproof pipe column is reduced, vortex-induced vibration of the waterproof pipe column is lowered, the service life of the waterproof pipe column is prolonged, and an element does not need to be additionally arranged on the waterproof pipe column.

Description

technical field [0001] The invention relates to the technical field of reducing the resistance of ocean currents to riser strings, in particular to a buoyancy block surface structure for reducing the resistance of ocean currents to riser strings. Background technique [0002] With the development of offshore oil and gas from shallow seas to deep seas of 1000-3000 meters, the length of the riser string, as an important channel for offshore oil and gas development, has also greatly increased, and correspondingly, the resistance to flow around it under such a long length cannot be ignored. Especially for the increase of the connection support reaction force at the end of the riser string and the enhancement of vortex-induced vibration. The huge resistance caused by the bypass flow will definitely have an adverse effect on the stability, safety and service life of the water supply pipe. Therefore, the research on drag reduction control of deep water riser string is very importa...

Claims

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Application Information

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IPC IPC(8): E21B17/01
CPCE21B17/012F15D1/003F15D1/0035
Inventor 王国荣廖崇吉刘清友周守卫毛良杰张敏胡刚
Owner SOUTHWEST PETROLEUM UNIV
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