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In-situ dragging and putting-down method for deepwater discarded jacket

A jacket and in-situ technology, applied to tugboats, water conservancy projects, underwater structures, etc., can solve problems such as broken wire ropes, huge reverse pull force applied by wire ropes and tugboats, and tugboat overturning, so as to improve safety and reduce The effect of construction risk

Inactive Publication Date: 2020-12-01
OFFSHORE OIL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When laying down the discarded jacket, if the wire rope between the tugboat and the jacket is connected and fixed in a conventional way, it will appear after the jacket is pulled down by the tugboat, due to the inertia of the jacket and the influence of water depth , will exert a huge reverse pulling force on the wire rope and the tugboat, which is very likely to cause the risk of the wire rope breaking or the tugboat capsizing

Method used

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  • In-situ dragging and putting-down method for deepwater discarded jacket
  • In-situ dragging and putting-down method for deepwater discarded jacket
  • In-situ dragging and putting-down method for deepwater discarded jacket

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0017] Examples such as Figure 1 to Figure 3 As shown, the present invention discloses a method for in-situ dragging and laying down of a deep-water abandoned jacket, which is realized through the following steps: (1) Weld a horizontally arranged column-shaped pole on the horizontal strut 11 at the cable walkway at the top of the jacket 4 Towing point 9; (2) Perform internal mud discharge treatment of steel pile 3 for each underwater steel pile 3 on jacket 4; (3) Perform internal cutting of steel pile 3 for each underwater steel pile 3 on jacket 4; (4) In the direction in which the underwater steel pile 3 of the jacket 4 is laid down, discharge mud outside the underwater steel pi...

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Abstract

The invention discloses an in-situ dragging and putting-down method for a deep-water discarded jacket. The operations of inner sludge discharge, inner cutting, outer sludge discharge, transverse dragging and the like are carried out on the discarded jacket; and the jacket discarded in a deep well can be put down in situ. Moreover, an automatic unhooking mode of a steel wire rope and the jacket isprovided, before the jacket topples over, the steel wire rope is dragged to be separated from the jacket, the situation that reverse tension is applied to the steel wire rope and a tug due to inertiawhen the jacket topples over is avoided, the construction risk is reduced, and the safety of equipment and personnel is improved.

Description

technical field [0001] The invention relates to the field of offshore engineering platform dismantling, in particular to a method for dragging and laying down an abandoned jacket in deep water in situ. Background technique [0002] When the deep-water abandoned jacket is dismantled at sea, if it is hoisted and transported vertically, it will face the following technical difficulties: (1) The jacket is high in height and heavy, and it is difficult to find suitable floating crane resources for hoisting; ( 2) The span between pile legs at the root of the jacket is wide and the center of gravity is high, making it difficult to find suitable barge resources for transportation. Therefore, after the deep-water abandoned jacket is dragged down in situ, hoisting and transporting it horizontally can save floating crane and barge resources, and reduce the operating cost and construction risk of the project. [0003] When laying down the discarded jacket, if the wire rope between the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B17/00E02D9/04B63B35/68
CPCB63B35/68E02B17/00E02D9/04
Inventor 刘建峰王彦多邓合霞阮胜福高绍涛孙道青杜颖赵强
Owner OFFSHORE OIL ENG