Energizing elements within seal stacks may include mechanically compressed seals set by applied force, hydraulically energized seals activated by pressure, or chemically energized swellable elastomers expanding in specific fluids. Energization method affects setting procedures, sealing response time, and retrievability considerations for temporary versus permanent packer installations. https://linkingbookmark.com/story20902764/replacement-api-6a-wellhead-seals-oem-quality-oil-gas-gaskets