基于深海卷管铺设的海管椭圆度分析  

Study on Ovalization of Submarine Pipe During Deep Water Reel-Lay

作　　者：张九菊[1] 段梦兰[1,2] 马建敏[1] 胡显伟 

机构地区：[1]复旦大学力学与工程科学系,上海200433 [2]中国石油大学(北京)海洋油气研究中心,北京102249 [3]中国石油天然气勘探开发公司,北京100034

出　　处：《应用数学和力学》2013年第6期552-563,共12页Applied Mathematics and Mechanics

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2008ZX05056);国家自然科学基金"深水双层海底管道的热屈曲特性及控制"(50979113);国家重点基础研究发展计划(973计划)"深海工程结构的极端环境作用与寿命服役安全"(2011CB13702)

摘　　要：深水海管在使用卷管铺设时,海管截面变形较大,产生椭圆化现象,降低了海管的弯曲能力,甚至使海管发生失稳及局部屈曲。利用应变能法和Ritz法建立了海管椭圆度理论求解方法。用有限元软件ABAQUS对有初始弯曲曲率及无初始弯曲曲率的海管分别进行了非线性有限元分析,并与modified Brazier方法及modified von Kármán方法得到的结果进行了比较。由以上几种方法得到的计算结果基本吻合。再次利用有限元软件对海管椭圆度的敏感参数进行了分析,多组结果显示椭圆度受海管管径、壁厚、初始弯曲曲率、弯曲曲率等参数的影响,并得到了椭圆度随海管几何参数变化的规律。椭圆度的研究为深海卷管铺设提供了理论基础。During the reel-lay installation in deep water, large deformation occurs on the pipe- line, leading to ovalization, instability or even local buckling. Ovality theory was established based on strain-energy method and Ritz method. Also, finite element analysis was employed by software, ABAQUS. The results obtained from the former procedures were compared with those from modified Brazier and modified yon Kármán, serving as a good verification of the for- mer solution. In addition, intact and defective pipelines are separately simulated by ABAQUS, suggesting that ovality is subject to pipeline-diameter, wall-thickness, initial bending curvature and bending curvature,et al. The law between ovality and geometrical parameters is further obtained. The above research of ovality is of certain interest to reel-lay installation.

关 键 词：椭圆度 弹塑性变形 弯曲曲率 能量法 

分 类 号：TE973[石油与天然气工程—石油机械设备] O344.3[理学—固体力学]