دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the first casing or conductor string (generally with a diameter of 30 to 36 inches-76 to 91 centimetres) set when drilling a well from a floating offshore drilling rig. It prevents sloughing of the ocean-floor formations and is a structural support for the permanent guide base and the blowout preventers.

n: a structure attached to and installed with the foundation pile when a well is drilled from an offshore floating drilling rig. It is seated in the temporary guide base and serves as a well head housing. Guidelines are attached to it so that equipment (such as the blowout preventers) may be guided into place on the wellhead.