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Dovetail groove is used to put the O-ring or elastomer dovetail seal during installation. This groove is not common because it is more expensive to machine, but this dovetail groove can avoid seal extrusion out.
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50Dovetail groove seal design for wellhead casing
Dovetail groove is used to put the O-ring or elastomer dovetail seal during installation. This groove is not common because it is more expensive to machine, but this dovetail groove can avoid seal extrusion out.
The special groove walls are good way to retain the seal, because the groove essentially pinch the seal, keeping it in position. We usually recommend using dovetail seals instead of O rings, because dovetails seal has better anti-extrusion performance.
Different working mediums can influence dovetail seal materials. JST has material NBR/FKM/AFLAS which are suitable for different working conditions.
JST materials also passed H2S immersion test and RGD test.
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Working Conditions |
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Temperature range |
Pressure |
Medium |
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LU, PU, SX |
≤20,000 PSI |
Oil, Water, Gas, H2S, CO2 etc |
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Features: Anti extrusion |
Size:
Customized sizes
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Categories
Wellhead secondary pack off seal is used to seal the hanger to the wellhead.
T-seals are three piece seals with an elastomeric lip and hard plastic anti-extrusion rings, it is proved to be of long time service. The standard design will fit into an o-ring gland and can be machined or net moulded.
Lockdown screw seal is used mainly in geothermal applications, HNBR packing with stainless steel caps provide superior performance over metal pressure seals.
JST's metal end cap seal is elastomer bonded onto 2 steel caps. This provides high level of extrusion resistance.
The ID S seal is used for wellheads, downhole tools and surface pressure control equipment as a critial part.
Pack off seal or Secondary Seal Assemblies is installed in the lower seal area of the Casing Spool or Tubing Head.
P seal is constructed from an elastomer with back up rings for anti-extrusion. Energized by the injection of sealant, it is a static seal that is used to seal rough casing and tubing. Backup rings are available in Mesh Stainless Steel or Solid Carbon Steel.
The FS-seal is a relatively large cross section spring energized elastomer casing and tubing hanger seal for wellheads that always has the springs on the internal surface.
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