AskDefine | Define wellhead

The Collaborative Dictionary

Wellhead \Well"head`\, n. A source, spring, or fountain. [1913 Webster] At the wellhead the purest streams arise. --Spenser. [1913 Webster] Our public-school and university life is a great wellhead of new and irresponsible words. --Earle. [1913 Webster]

Word Net

wellhead

Noun

1 the source of water for a well [syn: wellspring]
2 a structure built over a well

English

Noun

  1. The surface structure of an oil well etc
  2. The source of water for a stream or well
For classical wellheads for water wells, see puteal.
A wellhead is that part of an oil well which terminates at the surface, whether on land or offshore, where petroleum or gas hydrocarbons can be withdrawn.
The primary role of the wellhead is pressure containment & to hold the casings and the production tubing. Within the wellhead lies the tubing hanger, from which the production tubing hangs. The Christmas tree sits on top of the wellhead housing. Casing hangers serve to hold the different casings. Valves between these hangers then allow access to the different annuli for pressure control and particularly gas lift.
wellhead in Portuguese: Boca de poço
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