Simulation Study on Stress Corrosion Behavior of Special Thread Teeth Surface of Oil Well Tubing
With the exploration and development of high-temperature,high-pressure and high-yield oilfields,oil well tubing is facing increasingly harsh wellbore environments,and the corrosion failure of its threaded coupling has become one of the main reasons restricting the efficient exploitation of oil and gas fields.In this paper,a me-chanical-electrochemical finite element model for thread teeth of oil well tubing was built using COMSOL Multiphys-ics,and the model was used to study the stress distribution and corrosion laws of various parts of threads of oil well tubing under different external loads.The results show that the stress distribution of various parts of the oil well tub-ing thread teeth is positively correlated with the degree of corrosion,that is,the greater the contact stress,the more severe the thread corrosion is.The stress of the joint thread is most concentrated at the transition between the gullet and the bearing surface,where the corrosion is most severe.Plastic deformation can cause a sharp increase in an-ode corrosion current density,resulting in severe corrosion behavior.The study results provide new ideas for the study of the corrosion failure mechanism of oil well tubing joint thread,and also provide theoretical basis and solu-tions for solving wellbore integrity problems under harsh working conditions.
oil well tubing jointspecial threadthread teethstress corrosionnumerical simulation
万方数据
维普
