Analysis of contact stress and stress concentration coefficients in the utility connection strings Oil Drilling

In this study, screw connection strings drilling tools in drilling vertical wells most at risk of failure of the other members are using axial symmetric elements software ANSYS, finite element method and model are. For modeling contact between the surfaces of the contact elements and phenomena of interest constraint equations. Tensile and compressive axial forces, internal and external pressures resulting from the drilling fluid, pipe, torque from the engine at the top Amalshdh wells, and bending moments resulting from heavy pipes buckling in drilling wells down into the main loads that are Bhmdl. API standards in order to improve the fatigue behavior of these connections as well as some Pyshbar it applies. Model under tensile loading, compression, pure Pyshbar has been a combination of them. Determine the location and maximum stress concentration factor in pin (pin) and box (box), the effect on the amount of exercise Pyshbar stress concentration factor, as well as its impact on the critical indentation load and subsequently fatigue life including the things in this article It has been discussed. Finally, the debate about the convergence of stress levels in response surfaces are presented.