摘要
针对中国南海深水钻井隔水管面临的触底事故风险,建立了深水钻井隔水管触底事故力学分析模型,并以某深水浮式钻井平台隔水管触底事故为例进行隔水管触底力学特性分析和事故分析,确定触底后隔水管回收作业窗口。力学特性分析和事故分析结果表明:触底后隔水管呈悬链线形状,隔水管弯矩和等效应力的最大值均发生在下挠性接头处;触底后隔水管顶部和底部的弯曲变形较为严重,上下挠性接头转角较大,导致平台月池、张紧器和下挠性接头损坏,若平台继续向浅水区漂移,可能发生隔水管断裂。触底后回收隔水管时,必须保证平台位移和隔水管提升高度在作业窗口内,否则会导致隔水管断裂或进一步损坏隔水管底部总成;隔水管脱离海底后不再移动平台并继续回收作业。
For deepwater drilling riser system facing grounding risk in the South China Sea, a mechanical analysis model of deepwater drilling riser grounding accident was established. Focusing on drilling riser grounding accidents of a deepwater floating drilling platform in the South China Sea, mechanical characteristics and grounding accidents of riser were analyzed. And the riser retrieving window was determined. The results showed that the shape of the riser system after riser grounding is catenary. The maximums of bending moment and von Mises are located at lower flex joint. Platform moon pool, tensioner and lower flex joint are damaged due to severe bending deformation in the upper and lower drilling riser system after riser grounding accidents. The riser may fracture if drilling platform continues to move toward shallow water. Drilling platform displacement and riser lift height must be within the riser operation window during riser retrieving, or else the riser may fracture and the LMRP may suffer fitrther damage. Residual riser and LMRP can be retrieved in a fixed position when the drilling riser system is separated from seabed.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2013年第6期738-742,共5页
Petroleum Exploration and Development
基金
国家科技重大专项课题"深水钻井隔水管作业管理及安全评价技术"(2011ZX05026-001-05)
长江学者和创新团队发展计划"海洋油气井钻完井理论与工程"(IRT1086)
中央高校基本科研业务费专项资金资助项目(11CX05009A
12CX06065A)
关键词
台风
深水
钻井
隔水管
触底事故
事故分析
typhoon
deepwater
drilling
riser
grounding accident
accident analysis
