Wellhead selection guidelines summary
The wellhead is simply a crossover between the various casings and the Christmas tree or -temporarily - the BOP.
Unitized wellheads
The evolution from spool type wellheads to compact, or uniheads has occurred over a number of years. This evolution has generated a wellhead which is technically superior, offers enhanced safety and rig time saving, without a direct cost penalty. Experience has also shown, that there need be little or no distinction between the designs for exploration and development applications, provided that the unihead is maintainable.
Standardisation
The objective . . .