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AFE: wellhead equipment
Selecting and costing appropriate wellhead equipment for the particular well construction and environment are an important component of the authority for expenditures (AFE).
The wellhead equipment is attached to the casing string for pressure and stability support. Its cost is dependent on the number and size of the casing and tubing strings, pressure requirements, equipment components, and special features such as H2S stainless duty.
Total wellhead equipment costs can range from U.S. $7,500 for a low-pressure set of equipment to U.S. $1,500,000 for high-pressure, stainless-steel wellhead equipment and a tree. Subsea completions are even more expensive.
The wellhead equipment consists of:
- Casing head
- Intermediate and tubing spools
- Production tree.
The casing head is attached to the surface casing and will ultimately support all casing loads. Intermediate or production casing is hung inside the casing head. The intermediate spool supports the production casing if an intermediate string is run. The tubing spool is run only if the well is completed. It is set on the casing head or intermediate spool. The tree contains the production valves and chokes used for producing the oil or gas.