The wellhead provides the basis for the mechanical construction of the well at surface or the sea-bed.
It provides for:
Suspension of all individual casings and tubular, concentrically in the well
Ability to instal a surface closure/flow control
device on top of the well namely:
i) A blow out preventer stack whilst drilling
ii) A Xmas tree for production or injection
- Hydraulic access to the annuli between casing to allow cement placement and between the production casing and tubing for well circulation