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Towards an Novel Stiff String Model for the Torque and Drag Problem

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Academic year: 2021

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Figure

Figure 1. (a) Description of an elementary problem : the drillstring, materialised by its axis E , is subjected to the body force f between its extremities s a and s b ; it is characterised by its bending stiffness B and torsional stiffness C
Figure 2. Buckling of an elastic, weightless, drillstring inside a helical borehole. Results obtained with the propo- propo-sed stiff string model (—–) are compared to the exact solution (- - -) for M = −1 and (c) T / |T 0 | = −1.25, (c) T / |T 0 | = −2.5,

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