Metal-to-metal seals provide ultimate reliability in downhole tools for HPHT and sour service, using Inconel or stainless steel with elastomeric energizers. In safety valves, they achieve V0 gas-tight sealing per API 6A. Surface coatings like silver plating reduce galling. Challenges: high setting forces, addressed by explosive actuation. SLB’s metal seals endure 25,000 PSI and 450°F.... https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/