摘要
兼具抗压与保温功能的夹层保温管道是深水油气输运潜在的理想解决方案,但卷筒式安装导致的残余应力和塑性变形则是影响其承载能力的重要因素之一。为了分析夹层管卷筒式安装缠绕和校直过程导致的残余应力和塑性变形的变化规律,建立了海洋深水夹层管卷筒式安装的数值模型,并利用室内全尺寸实验结果验证该模型的准确性;利用该有限元模型,分析了深水夹层管卷筒式安装过程中应力—应变变化规律、夹层管截面椭圆度变化情况以及安装校直后夹层管等效塑性应变的累积情况;通过参数分析讨论了夹层管的钢管厚度和层间黏结属性对夹层管卷筒式安装力学行为的影响情况。研究结果表明:①基于所建立的夹层管卷筒式安装数值分析模型求得的夹层管缠绕和校直阶段的塑性应变,与实验结果的误差分别为0.7%和0.5%,证明该模型可以满足计算精度的要求;②在夹层管缠绕和校直过程中,夹层管层间接触属性对于轴向塑性应变和周向塑性应变影响均较小;③夹层管钢管厚度对于夹层管轴向塑性应变的影响较小,但其对外层钢管周向塑性应变的影响却较为明显;④校直过程显著影响夹层管道椭圆度,影响程度随着外层钢管壁厚的增加而增大,同时卷筒式安装过程产生一定程度的塑性应变累积,将影响夹层管的承载能力。结论认为,所建立的数值模型可用于夹层管卷筒式安装力学行为分析,为考虑安装缺陷影响的夹层管承载能力计算提供了技术支持。
Sandwich pipes with both functions of pressure resistance and thermal insulation is the potential ideal solution in deepwater oil and gas transportation,but residual stress and plastic strain induced by reel-lay installation are two important factors affecting the bearing capacity of sandwich pipe.In order to analyze the variation laws of residual stress and plastic strain caused in the reeling and straightening process of reel-lay installation,a numerical model was established for the reel-lay installation of offshore deepwater sandwich pipe.And its accuracy was verified by using the laboratory full-scale experimental results.Then,the stress-strain variation laws of the deepwater sandwich pipe in the process of reel-lay installation,the section ovality variation of the sandwich pipe and the accumulation of equivalent plastic strain after the installation straightening were analyzed by using the finite element model.Finally,the influences of steel pipe wall thickness and interlayer adhesion behavior of the sandwich pipe on the mechanical behavior during the reel-lay installation were discussed by means of parametric analysis.And the following research results were obtained.First,the error between the plastic strain in the reeling and the straightening stage of the sandwich pipe calculated on the basis of the numerical analysis model which is established for the reel-lay installation of the sandwich pipe and the experimental results is 0.7% and 0.5%,respectively,which proves that this model meets the requirement of calculation accuracy.Second,in the reeling and straightening process of the sandwich pipe,its interlayer contact performance has little influence on axial and circumferential plastic strain.Third,the steel pipe wall thickness of the sandwich pipe has little interference on its axial plastic strain,but its influence on the circumferential plastic strain of the outer steel pipe is more obvious.Fourth,the straightening process has a significant influence on the ovality of the sandwich pipe and its influenc
作者
刘书杰
黄熠
孟文波
蒋东雷
刘和兴
李明亮
高永海
付光明
LIU Shujie;HUANG Yi;MENG Wenbo;JIANG Donglei;LIU Hexing;LI Mingliang;GAO Yonghai;FU Guangming(CNOOC China Limited Zhanjiang Company,Zhanjiang,Guangdong 524057,China;School of Petroleum Engineering,China University of Petroleum-East China,Qingdao,Shandong 266580,China;LTS/COPPE/UFRJ,Rio de Janeiro,Brazil)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2020年第12期143-150,共8页
Natural Gas Industry
基金
国家自然科学基金项目“含缺陷深水夹层管非线性动态压溃机理研究”(编号:51709269)
国家自然科学基金项目“天然气水合物开采井与深海土的相互作用和安全设计”(编号:51890914)
山东省油气储运安全重点实验室开发基金
中央高校基本科研业务费专项资金项目“深水夹层管非线性动态屈曲传播与止屈控制”(编号:20CX02410A)。
关键词
海洋油气
开采
夹层管
卷筒式安装
管道校直
层间黏结属性
塑性变形
残余应力
Offshore oil and gas
Exploitation
Sandwich pipe
Reel-lay installation
Straightening process
Interlayer adhesion behavior
Plastic strain
Residual stress
