Parameter sensitivity analysis of the axial stability for a marine flexible pipe  

作　　者：Liping Tang Jiaxin Zou Kenan Song Yongheng Shi Li Liu 

机构地区：[1]School of Mechatronic Engineering,Southwest Petroleum University,Chengdu,610500,China [2]School of Engineering,University of Aberdeen,Aberdeen,AB243UE,UK [3]Oil&Gas Control Center,National Petroleum and Natural Gas Pipeline Network Group Co.Ltd.,Beijing,100020,China

出　　处：《Petroleum》2024年第3期548-556,共9页油气（英文）

基　　金：supported by the National Natural Science Foun-dation of China(No.51904262);China Postdoctoral Science Foundation(43XB3793XB).

摘　　要：Marine unbonded flexible pipes serve as the most essential equipment in offshore oil and gas exploration and exploitation.Axial compressive loads during installation or in service in the complex marine environment usually lead to buckling failure.A flexible pipe is a composite structure with multiple functional layers,of which the tensile armor layer plays a key role with regard to the response of the pipe subjected to axial loads.In this paper,a simplified three-dimensional finite element model is developed,focusing on the tensile layer and replacing the carcass layer,pressure sheath layer,and pressure armor layer by a cylindrical rigid body to reduce computational expense.By using this model,the buckling failure modes of the tensile armor layer(in particular the birdcaging phenomenon)are analyzed.Several key parameters that affect the stability of the flexible pipe under axial compression and torsion are emphasized,and their effects on its axial and torsional stiffness are compared and discussed.The results show that both the lay angle of the steel wires and the interlayer friction coefficient have a significant influence on the axial and torsional stiffness of the pipe,whereas the damaged length of the outer sheath has virtually no effect.

关 键 词：Flexible pipe Tensile armor Buckling failure Key parameters STIFFNESS 

分 类 号：TE95[石油与天然气工程—石油机械设备]