石油学报 ›› 2022, Vol. 43 ›› Issue (3): 410-419.DOI: 10.7623/syxb202203008

• 石油工程 • 上一篇    下一篇

非黏结柔性管骨架层径向抗压能力计算方法

祝效华1, 雷清龙1, 孟宇2, 崔晓轩2   

  1. 1. 西南石油大学机电工程学院 四川成都 610500;
    2. 河北恒安泰油管有限公司 河北景县 053500
  • 收稿日期:2021-01-18 修回日期:2022-01-06 发布日期:2022-04-06
  • 通讯作者: 祝效华,男,1978年7月生,2005年获西南石油大学博士学位,现为西南石油大学机电工程学院教授、博士生导师,主要从事管柱力学和钻井提速等方面的研究工作。
  • 作者简介:祝效华,男,1978年7月生,2005年获西南石油大学博士学位,现为西南石油大学机电工程学院教授、博士生导师,主要从事管柱力学和钻井提速等方面的研究工作。Email:zhxth113@163.com
  • 基金资助:
    西南石油大学研究生科研创新基金项目(2020cxyb007)、中组部"万人计划"领军人才(648)项目和国家重点研发计划项目"隔水管双梯度充气钻井系统研发"(2018YFC0310204)资助。

Calculation method of radial compression capacity of carcass layer of unbonded flexible pipes

Zhu Xiaohua1, Lei Qinglong1, Meng Yu2, Cui Xiaoxuan2   

  1. 1. School of Mechatronic Engineering, Southwest Petroleum University, Sichuan Chengdu 610500, China;
    2. Hebei Heng'antai Pipeline Co., Ltd., Hebei Jingxian 053500, China
  • Received:2021-01-18 Revised:2022-01-06 Published:2022-04-06

摘要: 骨架层作为非黏结柔性管抗径向压力层,其性能决定了柔性管的安装性能和作业深度。但由于骨架层结构复杂,传统方法难以准确计算其抗压性能。通过骨架层截面等效方法,并利用压缩试验、三维及二维有限元方法和理论方法分析了骨架层的压缩性能。计算结果表明:①在对径压缩刚度分析中,三维有限元方法与试验结果误差为8.29%,截面等效的理论方法与试验结果误差为1.86%;②在均匀压缩临界载荷分析中,使用有限元方法并计入骨架层塑性参数才能获得准确的临界压溃载荷,三维有限元方法及截面等效的二维有限元方法与试验结果的误差分别为1.18%和0.88%。研究结果表明,骨架层压缩模型及骨架层截面等效方法具备实用性,能为骨架层设计及性能评估提供简便、可靠的方法。

关键词: 非黏结柔性管, 骨架层等效, 径向压缩试验, 有限元方法, 理论方法, 对径压缩刚度, 临界压溃载荷

Abstract: Carcass layer is known as the anti-radial pressure layer of unbonded flexible pipe, whose performance determines the installation performance and operation depth of flexible pipe. However, due to the complex structure of carcass layer, it is difficult to accurately calculate its compressive properties using traditional methods. Therefore, this paper proposes the cross section equivalence method of carcass layer, and the compression performance of carcass layer is analyzed by experimental, three-dimensional and two-dimensional finite element methods, as well as theoretical method. The calculation results show that:(1) in the analysis of radial compression stiffness, the error between the the result from the three-dimensional finite element method and the experimental result is 8.29%, and that between the results from the cross section equivalence method and the experimental result is 1.86%; (2) when analyzing the critical collapse load of uniform compression, it can be only obtained by using the finite element method and taking into account the plasticity parameters of carcass layer, and the error between the results of the three-dimensional finite element method and the two-dimensional finite element method of cross section equivalence and the experimental result is 1.18% and 0.88%, respectively. The results show that the compression model and cross section equivalence method of carcass layer are applicable and can provide simple and reliable methods for the design and performance evaluation of carcass layer.

Key words: unbonded flexible pipe, equivalence of carcass layer, radial compression test, finite element method, theoretical method, radial compression stiffness, critical collapse load

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