1. n. [Drilling]
The system of spools, valves and assorted adapters that provide pressure control of a production well.
See: casing string, casinghead, day rate, Texas deck
2. n. [Well Completions]
The surface termination of a wellbore that incorporates facilities for installing casing hangers during the well construction phase. The wellhead also incorporates a means of hanging the production tubing and installing the Christmas tree and surface flow-control facilities in preparation for the production phase of the well.
See: casing hanger