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Application of a Pipe Stability Model for Predicting Critical Loading Conditions in Slim Holes
This paper presents finite element models and techniques for the computation of critical buckling loads of oilfield drill pipe in vertical, inclined, horizontal, and curved boreholes. The buckling models are based on non-linear mechanics and are constructed with the ANSYS finite element program. The borehole inclination angles range from 0 to 90 degrees and the curvatures (doglegs) range from 1 to 10 degrees per 100 feet. The smooth tubes simulate drill pipe with diameters of 4, 4.5, and 5 inches. A. Lubinski’s findings for helical, post buckling and for two dimensional critical buckling in straight vertical holes and P. R. Paslay’s findings for two dimensional buckling in straight inclined holes, significantly verify the validity of the finite element models constructed in this work. The findings gained in this research are presented in the form of graphs and tables.
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