Abstract
Metal sealing system is used frequently in the dynamic rotary seal of downhole tools of petroleum, natural gas and mining. Mechanical behavior and sealing performance of the metal sealing system in roller cone bit were analyzed in this paper. Influences of pressure difference, compression ratio, fluid pressure, angle and thermal load on the metal sealing system’s mechanical behavior and seal performance were studied. The results show that the effect of pressure difference should be considered under fluid pressure. The von Mises stress concentrates on the inside of O-rings under the influence of compression ratio. The low-stress area appears on the inside of O-rings under the effect of fluid pressure. The high-stress concentration area of metal sealing surface appears on the surface of metal rings under different angles. Sealing performance, compression ratio, fluid pressure and angle have the same change trend. Thermal load is not a single impact on the stress distribution and deformation, but together with fluid pressure affects the sealing performance. The dynamic O-ring more easily fails than the static O-ring. Those results can provide a new direction for the structural optimization of metal sealing system in roller cone bits.
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