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| Nonlinear buckling analysis of tubulars in the wellbore of ultra-short radius horizontal wells based on semi-implicit method |
| Received:December 09, 2023 Revised:January 18, 2024 |
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| DOI：10.7511/jslx20231209001 |
| KeyWord:semi-implicit method tubular nonlinear buckling finite element method ultra-short radius horizontal well |
| Author | Institution |
| 罗敏 |
东北石油大学 机械科学与工程学院, 大庆 |
| 崔文磊 |
东北石油大学 机械科学与工程学院, 大庆 |
| 徐亭亭 |
东北石油大学 机械科学与工程学院, 大庆 |
| 李巧珍 |
东北石油大学 机械科学与工程学院, 大庆 |
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| Abstract: |
| 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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