Static seals in downhole tool housings prevent leakage between threaded connections, pressure bulkheads, and component interfaces that do not experience relative motion. O-rings, metal C-rings, or custom gaskets create these stationary seals, requiring proper compression and surface finish to maintain integrity under downhole pressure and temperature conditions. https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/