牙轮钻头密封试验技术研究及密封圈性能评价

Research on sealing test technology of cone bit and evaluation of seal ring performance

牙轮钻头在深井钻进时会受到高温、高压、摩擦以及腐蚀等多个因素的共同作用,直接影响密封圈的使用寿命,进而影响钻头寿命。为此,进行了牙轮钻头密封试验技术研究。首先,设计了牙轮钻头密封试验机,设计了试验机各功能模块;其次,对O形橡胶密封圈和径向对称扁平橡胶密封圈在多因素影响下的密封性能进行了有限元分析,同时结合接触应力评判准则和von Mises准则对密封圈性能进行了评价和对比;最后,进行了密封圈在多因素作用下的寿命测试实验,并将实验结果与仿真结果进行了对比。实验结果验证了试验机进行牙轮钻头密封试验的可行性及可靠性。所设计的牙轮钻头密封试验机能预测牙轮钻头密封圈的使用寿命,具有广阔的工程应用前景。

Cone bit in deep drilling is subject to multiple factors such as high temperature,high pressure,friction and corrosion during deep well drilling,which directly affect the service life of the seal ring,and then affect the life of the bit.Therefore,the sealing test technology of cone bit was studied.Firstly,the sealing test machine of cone bit was designed,and its functional modules were designed;secondly,the sealing performances of O-shaped rubber seal ring and radially symmetrical flat rubber seal ring under the influence of multiple factors were analyzed by finite element method,and the contact stress judge criterion and von Mises criterion were used to evaluate and compare the seal ring performances;finally,the life test of the seal ring under the action of multiple factors was carried out,and the experimental results were compared with the simulation results.The experimental results verified the feasibility and reliability of the test machine for cone bit sealing test.The designed sealing test machine of cone bit can predict the service life of cone bit seal ring,and has a broad application prospect in engineering.