Cone bit bearing seal failure analysis based on the finite element analysis |
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| Affiliation: | 1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;2. Chuanqing Drilling Company International, China National Petroleum Corporation, Chengdu 610500, China;3. The College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China;1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;3. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China;4. Department of Engineering Mechanics, Northwestern Polytechnical University, Xi''an 710072, China;1. Department of Biomechatronics Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan;2. Parjet Co., Ltd, No.36, Heye 2nd Road., Daliao District, Kaohsiung City 83160, Taiwan;1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;2. CNPC Petroleum Engineering Technology Research Institute Co., Ltd., Beijing 102206, China;3. School of Engineering, Southwest Petroleum University, Nanchong 637001, China;1. School of Engineering and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian, Beijing, 100083, China;2. Key Laboratory on Deep Geo-Drilling Technology of the Ministry of Land and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian, Beijing, 100083, China |
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| Abstract: | Failure analysis of cone bit bearing seals is important in reducing production cost and preventing in-service component failure. However, a generally accepted criterion for their failure has not yet been established because of complexities in both their material properties and the environment. In this study, a two-dimensional axisymmetric finite element analysis (FEA) numerical model was established. FEA software was developed based on the Mooney–Rivlin constitutive model of the rubber material, and the penalty function contact algorithm. The distributions of stress, strain and contact pressure were analyzed to establish their effect on failure. The locations and causes of the failure and preventive measures were determined by comparison with an actual failure case. It was found that stress concentration and uneven pressure distribution occur at the seal. Rubber rings are highly and unequally compressed. Metal ring structure mainly determines sealing performance. To reduce the occurrence of failure, the structure must be improved by: designing an appropriate angle-tapered metal ring end face structure instead of a plane to change the trend in pressure distribution, increasing the contact area of the metal ring end face to reduce contact pressure and make the contact pressure distribution more uniform to reduce sealing surface wear, reducing the radial thickness to reduce the compression of the rubber ring, and improving back support structures to reduce the stress concentration. Results from the study can prevent and minimize risk for future failures to increase bit life and reduce drilling costs. |
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| Keywords: | Cone bit bearing seal Failure analysis Stress concentrations Stress distribution Finite element analysis |
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