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    • 19. 发明授权
    • Seal structure for elevated temperature service
    • 密封结构为高温服务
    • US4986511A
    • 1991-01-22
    • US450622
    • 1989-12-14
    • Richard E. IrbyG. Stephen KykerLorenzo P. DiSanoEduardo Alvarez
    • Richard E. IrbyG. Stephen KykerLorenzo P. DiSanoEduardo Alvarez
    • E21B33/00E21B33/06E21B33/08F16J15/00F16J15/10
    • E21B33/08E21B33/06F16J15/002F16J15/104Y10S277/944
    • A seal comprises a sandwich of a soft, low modulus resinous layer between two outer layers of harder, high modulus resinous material to provide an effectve high pressure seal at both low and high temperatures. The seal can be used in well head service, e.g., in a blowout preventer or stuffing box seal, in oil wells, geothermal wells of hydraulic mining pipes. The high modulus material is preferably a polybenzimidazole containing 5 to 50 wt. % short fibers. The low modulus material is preferably a thermoplastic fluorinated hydrocarbon polymer or a fluorinated synthetic elastomer containing polybenzimidazole in powder and/or short fiber form and short fibers of glass and/or carbon. For blowout preventer service, the seal can take the form of a T to be fitted with complementary metal retainers to form a cylindrical seal unit having a semicylindrical groove in the seal face to mate with the polish rod or tubing.
    • 密封件包括在两个较硬的高模量树脂材料的外层之间的柔软的低模量树脂层的夹层,以在低温和高温下提供有效的高压密封。 密封件可用于油井,液压采矿管的地热井中的井口服务中,例如防喷器或填料函密封。 高模量材料优选为含有5〜50重量%的聚苯并咪唑。 %短纤维。 低模量材料优选为热塑性氟化烃聚合物或含有粉末和/或短纤维聚苯并咪唑和玻璃和/或碳短纤维的氟化合成弹性体。 对于防喷器服务,密封件可以采取T形式来配备互补金属保持器,以形成圆柱形密封单元,该密封单元在密封面中具有半圆柱形槽,以与抛光棒或管材配合。