The best seals for downhole tools in intelligent completions use metal-to-metal + FFKM hybrid design. 500°F rated with fiber-optic pass-through capability. Full metal seal backup if elastomer fails. Reservoir engineers select the best seals for downhole tools that enable 20-year smart wells. https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/