海底管线悬跨监测技术初探

Preliminary Investigation on Monitoring Free Spanning Submarine Pipeline

悬跨是作为海洋油气外输生命线的海底管线的最薄弱部分,因为涡激振动(VIV)产生交变应力,导致悬跨管段疲劳,严重威胁海底管线完整性。监测是预防其疲劳失效,提高完整性管理,降低运行风险的重要手段。但是,悬跨监测在我国尚处于技术空白阶段。鉴于此,深入分析了悬跨监测所涉及的疲劳参数、数据传输方法和数据处理方法等关键技术,并评价其目的、优点和局限性,其中数据传输是最具挑战性的环节。以水声通信网络为数据传输载体的监测技术代表了悬跨监测的发展方向,同时,其面临水声信道、海底地形、网络协议和测点自身等方面的挑战。研究内容可促进我国悬跨监测技术的发展,为海底管线的完整性管理提供技术支持。

Free-spanning pipeline is the feeblest part of the submarine pipeline—the lifeline for offshore oil and gas transmission. The alternating stress generated by vortex-induced-vibration( VIV) usually lead to pipeline fatigue,which would threaten the pipeline integrity. Monitoring on the free spanning plays a vital role in preventing fatigue failure,enhancing integrity management and reducing operation risk of submarine pipeline. However,free spanning pipeline monitoring is still a technical gap in China. In view of this,in-depth study has been focused on the key techniques of free spanning pipeline monitoring including fatigue parameters,data transmission and processing methods. The key techniques' purpose,advantages and limitations have been assessed,wherein the data transmission is the biggest challenge. The monitoring technology of underwater acoustic communication network for data transmission represents the development trend of free spanning pipeline monitoring,and faces the challenges like underwater acoustic channel,the seabed topography,network protocols and the measuring point. The study aimed at promoting the free spanning pipeline monitoring development in China and providing technical support for the offshore pipeline integrity management.