Modeling the stress state of a drill string during directional drilling of a well
UDC: 622.833.52
DOI: -
Authors:
SAVICH VASILY L.
1,
MALININA NADEZHDA A.1,
BOREYKO DMITRY A.1,
GLINNIKOVA TATYANA P.2
1 Ukhta State Technical University, Ukhta, Russia
2 Ural State Mining University, Ekaterinburg, Russia
Keywords: mathematical model, drill string, stresses, stress state, macro-scale level, structural-analytical theory of strength
Annotation:
The authors of the article consider the problems of assessing the stress state of a drill string during directional drilling of wells. The researches resulted in getting the corresponding formulas for equivalent stresses calculationsaccording to the classical concepts of strength theory. As a comparison, a variant of assessing the stress state based on shear resistance was proposed as a variant of the structural-analytical theory of strength at the macro-scale level. When implementing the considered example in an elastic-plastic formulation, a negative result was obtained only within the framework of the structural-analytical theory of strength, which shows the flexibility and sensitivity of the proposed structural-analytical theory to any changes in the structure of the material that should be taken into account for long-term operated objects, including drill pipes.
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