Managing Pipeline Integrity and Dynamic Free Spans on Mobile Seabed in the Southern North Sea

Octavio E. Sequeiros, S. Ang, Craig Clavin, John G. Upton, Cliff Ho, Auke van der Werf
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Abstract

This paper describes the continuous improvement efforts to manage the integrity status of the Southern North Sea subsea pipeline system in the context of free spanning. The dynamic free-spanning threat is typically attributed to a mobile seabed. Current and wave action are constantly moving and eroding sediment by means of sand wave migration and scouring. It can lead to a fluctuation in span characteristics with respect to span length, span height and location over time. It makes pipeline integrity demonstration and spans remediation challenges. Focus areas include (1) identifying regions where operational pipelines are susceptible to critical span formation (2) understanding the broader context of seabed mobility, supported by several years of multibeam echo sound and met ocean data (3) risk-ranking & criticality of span formation (4) developing simplified calculation tool that allows fatigue damage to be estimated and accumulated for every location along the pipeline, conservatively (5) optimising and incorporating risk/event-based survey requirements (6) identification of suitable remediation solutions and developing a decision flow chart to facilitate selection of fit for purpose remediation solutions, with respect to span configuration and the surrounding seabed features. The outcome has improved the robustness of span management, reduced “reactive” span remediation activities, and allowed application of sound technical theory to allocate pipeline traffic light integrity status regarding the observed free spans.
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北海南部移动海底管道完整性与动态自由跨的管理
本文描述了在自由跨越的背景下,为管理北海南部海底管道系统的完整性状态而进行的持续改进工作。动态自由跨越威胁通常归因于移动的海床。水流和波浪作用通过沙浪的迁移和冲刷作用不断地移动和侵蚀沉积物。随着时间的推移,它会导致跨度特性在跨度长度、跨度高度和位置方面的波动。它使管道完整性演示和跨越补救挑战。重点领域包括:(1)确定运营管道易受临界跨形成影响的区域;(2)了解海底移动的更广泛背景,由几年的多波束回波和海洋数据支持;(3)跨形成的风险排名和临界性;(4)开发简化的计算工具,允许对管道沿线的每个位置进行疲劳损伤估计和累积。保守地(5)优化和纳入基于风险/事件的调查要求(6)确定合适的修复方案,并制定决策流程图,以便根据跨度配置和周围海床特征,选择适合目的的修复方案。研究结果提高了跨度管理的稳健性,减少了“反应性”跨度修复活动,并允许应用合理的技术理论来分配观察到的自由跨度的管道交通灯完整性状态。
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