Influence of Thread Parameter Errors on the Sealing Property of Tool Joints
In order to investigate the impact of thread parameter limiting errors on the sealing property of tool joints,based on API NC38 tool joint,the existence of three thread parameter limiting errors such as taper,tooth flank angle and pitch were analyzed.A finite element model of tool joint with 12 combinations of internal and exter-nal thread limiting errors were built,and the sealing property and stress distribution of tool joints with different er-ror combinations under the action of make-up torque and the coaction of make-up torque and axial load were ana-lyzed.The results show that the limiting error of pitch has the most significant impact on the sealing property of tool joint,and yield failure of the contact surface easily occurs.The limiting error of taper significantly reduces the sealing property of tool joint under tensile load.When the variation of the limiting error of the internal and external thread flank angles is opposite,plastic deformation occurs locally in the tool joint,which affects the sealing effect.During the machining of tool joint thread,the error range of thread parameters needs to be further controlled,so as avoid the occurrence of limiting error specified in the standard,and reduce the risk of sealing failure of tool joints.The research results provide technical support for fast and safe drilling.
tool jointlimiting error of taperlimiting error of tooth flank anglelimiting error of pitchseal-ing property
万方数据
维普
