A conceptual wellhead design is described based on the use of 18 3/4″ BOP stacks. It can also be used with the more popular 13 5/8″ BOP. The concept is based around three main parameters:
Maximum BOP protection during installation.
Full maintainibility to the point of total replacement.
Flexibility in use during the total lifetime.
The conceptual design incorporates not only operational requirements but also explains and gives solutions on the level of the detailed design.