| 罗敏,崔文磊,徐亭亭,李巧珍.基于半隐式法的超短半径水平井井筒内管柱非线性屈曲分析[J].计算力学学报,2025,42(3):471~477 |
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| 基于半隐式法的超短半径水平井井筒内管柱非线性屈曲分析 |
| Nonlinear buckling analysis of tubulars in the wellbore of ultra-short radius horizontal wells based on semi-implicit method |
| 投稿时间：2023-12-09 修订日期：2024-01-18 |
| DOI：10.7511/jslx20231209001 |
| 中文关键词: 半隐式法 管柱 非线性 屈曲 有限元法 超短半径水平井 |
| 英文关键词:semi-implicit method tubular nonlinear buckling finite element method ultra-short radius horizontal well |
| 基金项目:东北石油大学"国家基金"培育基金(2022GPL-11);国家自然科学基金(51674088);黑龙江省自然科学基金(LH2021E011)资助项目. |
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| 中文摘要: |
| 井筒内管柱受轴向载荷作用容易发生螺旋屈曲,导致管柱下入困难,螺旋屈曲严重时可发生自锁,甚至对管柱自身造成破坏。在静力学求解管柱屈曲时,容易出现计算不收敛和结果不稳定问题,而用动力学求解时,则会导致计算时间长和计算效率低的问题。为此,将隐式求解和显式求解的优点相结合,提出井筒内管柱非线性屈曲分析的半隐式法,在保证计算效率的同时,解决了管柱屈曲分析的收敛和稳定性问题。通过算例验证了半隐式方法的有效性。基于半隐式法建立了超短半径水平井井筒内管柱屈曲的有限元分析模型,分析了管柱在井筒内的屈曲形态、横向位移和接触压力等。研究结果表明,管柱发生螺旋屈曲之前先发生三维横向屈曲,且发生三维横向屈曲的临界载荷大于发生螺旋屈曲的载荷,在发生三维横向屈曲后,很容易演变为螺旋屈曲。管柱等效应力最大值为359 MPa,塑性应变最大值为0.234,管柱屈曲程度越严重,管柱轴向载荷传递效率越小。 |
| 英文摘要: |
| The tubulars in a wellbore are prone to helical buckling under axial loads,leading to difficulties in lowering the tubulars into a wellbore.Severe helical buckling can result in self-locking and even damage to the tubulars themselves.In static analysis of tubular buckling,convergence and stability issues often arise,while in dynamic analysis long computation times and low efficiency occur.To address these challenges,a semi-implicit method for nonlinear buckling analysis of tubulars in wellbores is proposed,combining the advantages of implicit and explicit solutions.This approach ensures computational efficiency and resolves convergence and stability issues in tubular buckling analysis.The correctness of the semi-implicit method is validated through numerical examples.A finite element analysis model for the buckling of tubulars in ultra-short-radius horizontal wells is established based on the semi-implicit method,analyzing the buckling morphology,lateral displacement,and contact pressure of the tubulars in the wellbore.The results indicate that three-dimensional lateral buckling precedes helical buckling,with the critical load for three-dimensional lateral buckling exceeding that for helical buckling.After three-dimensional lateral buckling occurs,it easily evolves into helical buckling.The maximum equivalent stress in the tubulars is 359 MPa,and the maximum plastic strain is 0.234 mm/mm.The more severe the buckling of the tubulars,the lower the efficiency of axial load transmission in the tubulars. |
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