Fatigue life prediction for bottom hole assembly with defects based on drillstring dynamics analyses
DOI:
https://doi.org/10.62813/see.2024.01.03Abstract
Fatigue is the main cause of drilling tool fracture. Accurate prediction of drilling tool fatigue life is challenging in drilling engineering. In this study, a drillstring dynamic model was established based on the finite element (FE) method, and the dynamic response of Bottom Hole Assembly (BHA) is obtained by numerical solution. Then the Mises equivalent stress of BHA was obtained using the fourth strength theory. Combined with Walker model, the fatigue life of drillstring with initial defects was predicted. The model was first verified by reproducing the experimental data. Then, the BHA dynamic characteristics were obtained and the effects of weight on bit (WOB), rotational speed, stabilizer (STB) location and crack size on the drillstring fatigue life were discussed. Results show that, increase in rotational speed leads to a small increase in the fatigue life below the neutral point. Decrease in WOB significantly prolongs the fatigue life, and adding STB can decrease the maximum equivalent stress and increase the drillstring fatigue life near the bit. The BHA fatigue life decreases as the size of initial crack increases. When the crack size increases to a critical value, the fatigue life tends to be stable and drilling tool may break instantly. This study could provide important guidance for drilling engineers in designing BHA.
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Copyright (c) 2024 Mingjie Cai, Mingmin He, Dan Mao
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