Pressure containment
When drilling a well on land, a spool wellhead system is traditionally used, as shown in Fig. 1. This wellhead is considered a “build as you go” wellhead system that is assembled as the drilling process proceeds. The spool system consists of the following main components:
Starting casing head.
Intermediate casing spools.
Slip casing hanger and seal.
Tubing spool (if well is to be tested and/or completed).
Studs, nuts, ring gaskets, and associated accessories required to assemble the wellhead.
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