Metal-to-metal best seals for downhole tools provide zero-leak performance in permanent completions. Inconel 718 with silver plating survives 500°F and sour gas for 30+ years. Secondary elastomeric backup for redundancy. Operators specify the best seals for downhole tools in carbon storage wells. https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/