摘要
钻井隔水管受到环境载荷循环作用,属于动态疲劳敏感结构,其疲劳性能分析成为隔水管设计的难题。对不同海洋环境载荷下的钻井隔水管进行时域非线性动力分析,采用雨流计数法、S-N曲线和Miner线性累计损伤准则建立钻井隔水管的疲劳损伤模型,重点研究了环境参数、隔水管几何尺寸和作业参数对钻井隔水管疲劳损伤的影响规律,并对影响钻井隔水管疲劳损伤的因素进行参数敏感性分析。分析结果表明,海床附近的钻井隔水管疲劳损伤随着土体刚度的增大而减小;适当增大钻井隔水管壁厚可以有效地抑制疲劳损伤;焊接偏心距的增大会明显加重钻井隔水管的疲劳损伤。该项研究结果为钻井隔水管设计和施工操作提供了理论依据。
Drilling riser is under the cyclic action of environmental load. It is of dynamic fatigue sensitive structure. Its fatigue performance analysis is a problem in riser design. A nonlinear dynamic analysis of the time domain of drilling riser under different offshore environmental loads was conducted. The rain-flow counting method, S- N curve and Miner linear cumulative damage-criterion were used to establish the fatigue damage model for drilling riser. The research focused on the law of effects of environmental parameter, geometric size of riser and operating parameters on riser fatigue damage. The parametric sensitive analysis of the factors influencing the damage was car- ried out. The analysis shows that the drilling riser fatigue damage near the seabed will decrease with the increase of soil rigidity. Proper increase of riser wall thickness can effectively control fatigue damage. Increase of welding eccentricity will noticeably increase the damage. The research achievement provides the theoretical basis for the design and operation of drilling riser.
出处
《石油机械》
北大核心
2014年第4期25-29,共5页
China Petroleum Machinery
基金
国家973计划项目"深海柔性结构的非线性流固耦合振动与破坏机理"(2011CB013702)
关键词
钻井隔水管
管土相互作用
疲劳损伤
参数敏感性
动力响应
有限元
drilling riser
pipe-soil interaction
fatigue damage
parametric sensitivity
dynamic response
finite element
