Casing Head Functions

The casing head in a conventional wellhead system is the lowest part of the wellhead assembly and is almost always connected to the surface casing string. It supports the remaining parts of the wellhead and completion equipment. The casing head performs the following functions:

• Provides a means for attachment to the surface casing string
• Allows for suspending the next casing string, usually the first intermediate string in the well
• Supports the blowout preventers (BOP) while drilling
• Provides outlets for fluid returns
• Provides a means to test the blowout preventers (BOP) while drilling
• May provide a test port for testing welded or other non-threaded bottom casing head connections
• May also be referred to by the following names, “A-Section”, “Braden Head” or “Starting Head”