悬挂撤离状态井下管柱纵横向耦合动力学特性分析  

Longitudinal and transverse coupled dynamic model for hang-off evacuation down-hole riser and its mechanical characteristic analysis

作　　者：曾松 毛良杰[2] 陈雪峰 杨森 张林 ZENG Song;MAO Liang-jie;CHEN Xue-feng;YANG Sen;ZHANG Lin(Engineering Technology Research Institute,PetroChina Southwest Oil and Gasfield Company,Chengdu 610031,China;State Key Labomtory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum Uni versity,Chengdu 610500,China;CNPC Engineering Technology R&D Company lim-ited,Beijing 102206,China;Development Department of PetroChina Southwest Oil and Gasfield Company,Chengdu 610021,China)

机构地区：[1]中国石油西南油气田公司工程技术研究院,成都610031 [2]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [3]中国石油集团工程技术研究院有限公司,北京102206 [4]中国石油西南油气田公司开发事业部,成都610021

出　　处：《船舶力学》2024年第4期582-593,共12页Journal of Ship Mechanics

基　　金：中国石油科技创新基金资助项目(2020D-5007-0210);中国石油-西南石油大学创新联合体科技合作项目(2020CX040204);四川省重点研发项目(21ZDYF3109,21SYSX0054)。

摘　　要：建立悬挂撤离状态井下管柱纵、横向耦合动力学数值分析模型,同时考虑平台横向撤离以及纵向升沉运动,给出软、硬悬挂边界条件。采用有限单元法进行离散,结合Newmark-β法求解动力学方程,并通过实验验证数值模型的正确性。针对南中国海深水井,分析了悬挂状态的井下管柱纵、横向耦合动力学特性,研究结果表明:纵、横向耦合条件下,井下管柱悬挂撤离时在横向呈现出波浪状位移形态,纵向呈现周期性振动;硬悬挂与软悬挂状态下最大横向位移和纵向位移都出现在管柱最底端;硬悬挂状态下管柱顶端位移较小、弯矩出现极大值;软悬挂状态下管柱顶端位移急剧增加,弯矩在水面附近出现极大值;悬挂撤离状态下管柱纵向位移包络线范围从顶部向底端逐渐增大,而轴向张力包络线范围从底部向顶部逐渐增大;另外,硬悬挂状态下管柱在顶端附近出现轴向压缩,存在发生屈曲失效的风险。A dynamic numerical analysis model for hang-off evacuation down-hole riser was established with coupling the longitudinal and transverse deformation.The hard hang-off and soft hang-off boundary conditions were given considering the horizontal evacuation and vertical heave movement of the platform.The down-hole riser model was discretized by the finite element method and solved by the Newmark-βmeth⁃od.An experiment for the hang-off riser was conducted to verify the accuracy of the numerical model.For a deep-water well in the South China Sea,the dynamic characteristics of hard hang-off and soft hang-off risers coupling the longitudinal and transverse deformation were analyzed.The research results show that the later⁃al deformation of the hang-off evacuation riser presents a wave shape,and the vertical deformation vibrates periodically with the platform heaving.The maximum lateral and longitudinal displacements of the downhole risers appear at the bottom of the riser under both hard and soft hang-off conditions.The displacement of the down-hole riser under the hard hang-off condition is small near the top,where the bending moment reaches a maximum value.The displacement of the down-hole riser near the top increases sharply under the soft hang-off condition,but the maximum bending moment appears near the water surface.The range of longi⁃tudinal displacement envelope of the hang-off evacuation riser increases gradually from top to bottom,while the range of axial tension envelope increases gradually from bottom to top.Besides,the minimum tension of the down-hole riser under hard hang-off conditions is negative near the top,where obvious axial compres⁃sion with the risk of buckling failure appears.

关 键 词：井下管柱 硬悬挂 软悬挂 纵横向耦合 动力学特性 

分 类 号：P754[天文地球—海洋科学]