دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see temporary guide base.

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: see permanent guide base, temporary guide base.

n: a pneumatic or hydraulic device used to provide a constant tension on the wire ropes that run from the subsea guide base back to a floating drilling rig.

n pl: lines, usually four, attached to the temporary guide base and permanent guide base to help position equipment (such as blowout preventers) accurately on the seafloor when a well is drilled offshore from a floating vessel.

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.

n: see temporary guide base.

n: the initial piece of equipment lowered to the ocean floor once a floating offshore drilling rig has been positioned on location. It serves as an anchor for the guidelines and as a foundation for the permanent guide base and has an opening in the center through which the bit passes. It is also called a drilling template.