摘要
钻井隔水管在海流、波浪等水动力作用下可发生侧向偏移、弯曲变形、波激和涡激振动,给钻井隔水管系统带来风险。采用k-ω湍流模型,对带附属管的实际尺寸钻井隔水管绕流场进行了CFD数值模拟分析,研究了来流攻角对隔水管主管流体力和尾流场流动特征的影响。结果表明,附属管对隔水管主管流动控制效果显著,考虑6根附属管的影响后隔水管裸单根所受水动力显著减小;除来流攻角为270°外,附属管都能减小主管上的平均阻力系数;所有来流攻角下主管的均方根升力系数幅值均有显著降低。分析认为,隔水管流体力减小的原因是主管与附属管外的剪切层相互影响,抑制了主管上的漩涡泄放;但不同来流攻角下管外涡街特性和漩涡泄放规律不同,流体力减小的机理也有差异。本文研究结果可为隔水管的附属管优化设计和布置提供参考。
A drilling riser may be subjected to lateral deviation,bending deformation,and wave/vortex-induced vibrations under hydrodynamic forces such as currents and waves,which bring risks to the drilling riser system. By adopting the k-ω turbulence model,CFD numerical simulation was conducted to analyze the ambient flow field of a real scale drilling riser with auxiliary lines,and to study the influence of incoming flow attack angles on the hydrodynamic forces of the main riser pipe and wake flow characteristics of the riser cross-section. The results show that the auxiliary lines have a significant effect on flow control of the main pipe,and hydrodynamic forces on the slick drilling riser joint remarkably decrease when considering six auxiliary lines than without any auxiliaries. The auxiliary lines can effectively reduce the mean drag coefficient on the main pipe in most incoming flow attack angles except 270°,and reduce the amplitude of the root-mean-square (RMS) lift coefficient in all incoming flow directions. According to the analysis,the reason for the decrease of the riser hydrodynamic forces is that the shear layers around the main pipe and the auxiliary lines interact with each other,which suppresses the vortex shedding on the main pipe. Moreover,the characteristics of vortex streets and vortex shedding are different with different incoming flow directions,which result in the mechanism differences of hydrodynamic forces decreasing. Results in this paper could provide reference for design and layout optimization of auxiliary lines around the main pipe of drilling risers.
作者
李朝玮
王嘉松
周建良
许亮斌
吴文波
LI Chaowei;WANG Jiasong;ZHOU Jianliang;XU Liangbin;WU Wenbo(CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;Shanghai Jiao Tong University,Shanghai 200240,China;CNOOC,Beijing 100010,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2019年第3期133-139,共7页
China Offshore Oil and Gas
基金
国家自然科学基金重点项目“海洋深水浅层钻井关键技术基础理论研究(编号:51434009)”
“十三五”国家科技重大专项“深水钻完井工程技术(编号:2016ZX05028-001)”部分研究成果
关键词
钻井隔水管
附属管
平均阻力系数
均方根升力系数
绕流场模拟
流动特征
drilling riser
auxiliary lines
mean drag coefficient
RMS lift coefficient
flow field simulation
flow characteristics
