Seal structure for elevated temperature service

Details Seal structure for elevated temperature service Seal structure for elevated temperature service

E - Fixed Constructions

21

B

166/50, 277/71

E21B 33/06 (2006.01) E21B 33/08 (2006.01) F16J 15/00 (2006.01) F16J 15/10 (2006.01)

Patent

CA 2030206

SEAL STRUCTURE FOR ELEVATED TEMPERATURE SERVICE ABSTRACT OF THE INVENTION 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 effective 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 or 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 ran 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.

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