摘要
钻井隔水管系统容易受海洋内波影响而出现大的转角、冲程和应力集中,导致停工甚至设备损坏事故,为保证深水钻井作业安全,利用有限元方法开展了内波作用下钻井隔水管系统作业安全评估。基于FLEXCOM程序建立了钻井隔水管系统在内波作用下的有限元模型,分析了可能限制钻井作业的各项因素,以作业窗口最大化为原则开展了内波环境下隔水管作业的敏感性分析。结果表明:内波主要通过上挠性接头转角影响隔水管系统作业,而且水深越小这种影响越显著,因此隔水管配置上部设置适当数量的裸单根可以在一定程度上减小内波影响;在遭遇内波平台出现大偏移的情况下,隔水管系统中伸缩节冲程容易超出极限,因此需要采取措施控制平台偏移。建议今后进一步开展内波环境下的钻井平台与深水钻井隔水管系统的耦合分析,更好地为现场作业提供技术指导。
Drilling risers are likely to encounter large angular deviation, stroke and stress concentration in soliton environment, leading to non-production time or even equipment damage incidents. To ensure the safety of deep water drilling operations, safety assessment was carried out for drilling riser systems in soli- ton environment using finite element method. A finite element model of drilling riser systems in soliton en- vironment was established based on the FLEXCOM program. Factors that may restrict drilling operations were analyzed, and sensitivity analysis was carried out for drilling riser systems in soliton environment to maximize operating envelope. Results show that the soliton impacts the riser system mainly through the angular deviation of the upper flexible joint, and the lower the water depth the more significant the effect. Therefore the soliton impact can be reduced to some extent by installing a appropriate number of naked sin- gle risers in the upper part of the riser configuration. In the case of large vessel offset in soliton environ- ment, the telescopic joint stroke is likely to reach its limit, and measures should be taken to control the vessel offset. The coupling analysis of the platform and the deep water drilling riser system in soliton envi- ronment is suggested to provide further technical guidance for deep water drilling operations.
出处
《中国海上油气》
CAS
CSCD
北大核心
2015年第3期119-125,共7页
China Offshore Oil and Gas
基金
"十二五"国家科技重大专项"深水钻完井工程技术(编号:2011ZX05026-001)"
国家重点基础研究发展计划(973计划)"深水海底井口-隔水管-平台动力耦合机理与安全控制(编号:2015CB251203)"部分研究成果
关键词
内波
深水钻井
隔水管
作业窗口
soliton
deep water drilling
riser
operating envelope
