Equilibrium equations for nonlinear buckling analysis of drill-strings in 3D curved well-bores |
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Authors: | MeiLan Tan LiFei Gan |
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Affiliation: | (1) Faculty of Science, Jiangsu University, Jiangsu, Zhenjiang, 212013, China;(2) 94973 Unit in Hangzhou of Zhejiang Province, Hangzhou, 310021, China |
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Abstract: | With the development of drilling technology, the oil/gas well has evolved from its early vertical straight form to the inclined,
horizontal, plane curved, or even 3D curved well-bore. Understanding of the buckling behavior of a drill-string in a well-bore
is crucial for the success of a drilling operation. Therefore, equilibrium equations for analyzing the buckling behavior of
a drill-string in a 3D curved well-bore are required. Based on Love’s equilibrium equations for a curved and twisted rod in
space, a set of equilibrium equations for the nonlinear buckling analysis of a drill-string in a 3D curved well-bore are derived
by introducing a radial constraint of the well-bore. The proposed formulae can account for the well curvature and tortuosity.
Thus, it can be used to analyze the buckling behaviors of a drill-string constrained in a well-bore and subjected to axial
compression, torsion at its upper end, and gravity simultaneously. It is worth noting that the existing equations in the literature
for a drill-string in a straight and plane curved well-bore with a constant curvature are a special case of the proposed model.
Thus, the present model can provide a theoretical basis for the nonlinear buckling analysis of a drill-string constrained
in a 3D curved well-bore.
Supported by the Jiangsu University Senior Professionals Startup Foundation (Grant No. 06JDG079) |
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Keywords: | nonlinear buckling tortuosity constraint equilibrium equations drill-strings 3D curved well-bores |
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