Where are primary and secondary wellhead seals located?

Primary and secondary wellhead seals are located at the wellhead, which is the structure at the surface of a well that provides access to the subsurface. The primary seal is typically the first line of defense against fluid escape and is directly in contact with the wellbore, while the secondary seal serves as an additional barrier, positioned below or around the primary seal to provide extra protection. These seals are essential for maintaining well integrity and preventing leaks.