Study on plasma arc penetration process of abandoned offshore wells

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2025-07-03 DOI:10.1016/j.marstruc.2025.103889

Peng Liu , Yonghong Liu , Qingxiang Wang , Xinlei Wu , Chi Ma

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引用次数: 0

Abstract

Recently, massive numbers of offshore production platforms have faced decommissioning. Abandoned offshore wells demolition is a significant part of offshore platform decommissioning. This work explored the plasma arc penetration process of abandoned offshore wells. Three types of workpieces were made for underwater penetration experiments. Workpiece 1 was a single-layer steel plate, workpiece 2 was a double-layer steel plate with a gap, and workpiece 3 was a double-layer steel plate with a cement layer. It was found that slag bridging occurred during the penetration of workpiece 2. Slag bridging was closely related to the gap size. There was no slag bridging during the penetration of workpiece 3, but its penetration difficulty was the greatest among the three working conditions. It was also found that the penetration effect of the second steel plate was strongly influenced by the branching arc acting on the second steel plate. The wider the gap and the cement layer, the lower the branching arc current on the second steel plate and the worse the penetration effect. In summary, the plasma arc can penetrate all three types of workpieces under certain operating conditions. This technology is expected to play a significant role in abandoned offshore wells demolition.

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海上废弃井等离子弧穿透过程研究

最近，大量海上生产平台面临退役。海上弃井拆除是海上平台退役的重要组成部分。本研究探讨了海上废弃井的等离子弧穿透过程。制作了三种类型的工件进行水下侵彻实验。工件1为单层钢板，工件2为带间隙的双层钢板，工件3为带水泥层的双层钢板。发现在工件2的侵彻过程中发生了渣桥接现象。渣桥效应与间隙大小密切相关。工件3在侵彻过程中没有出现焊渣桥接现象，但其侵彻难度在三种工况中最大。研究还发现，作用在第二钢板上的分支弧对第二钢板的侵彻效果有很大影响。间隙和水泥层越宽，第二钢板上的分支弧电流越低，穿透效果越差。综上所述，在一定的操作条件下，等离子弧可以穿透所有三类工件。这项技术有望在海上废弃油井的拆除中发挥重要作用。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.