Finite Element Analysis of Buckling and Snaking Vibration for Drill String in the Horizental Well

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Ansari, Amir | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45322 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Behzad, Mehdi
Abstract:
Snaking Vibration and buckling of drill string in the horizontal well was investigated in this research. Sinusoidal and helical critical buckling load are obtained for a specific drill string.
Drill string is modeled both analytically and numerically (finite element method). Drill pipes are considered as a clamped-clamped beam with constant cross section and the well is considered as a hollow cylinder. The thickness of cylinder was large enough to model the surrounding soil of the well. Buckling is a complex deformation and is somehow a random phenomenon. In addition, the length and the continuous contact between drill pipes and the well make the finite element model very huge and the current finite element programs are not successful to solve these models efficiently. A new beam element used to model the drill string in this thesis. This element reduces the time needed to solve the drill string models and the also has a good results in comparison to the literature. This model included friction effect, rotation and drilling mud. The effects of length and rotation speed studied
Keywords:
Drill String ; Helical Buckling ; Finite Element Method ; Sinusoidal Buckling ; Snaking Vibration