دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: one of several valves installed at the wellhead to prevent the escape of pressure either in the annular space between the casing and the drill pipe or in open hole (i.e., hole with no drill pipe) during drilling or completion operations. Blow- out preventers on land rigs are located beneath the rig at the lands surface;on jackup or platform rigs, at the waters surface;and on floating offshore rigs, on the seafloor. See annular blowout preventet;ram blowout preventer:

n: on land rigs, an earthen pit dug at the end of the flare line. Gas is flared over the flare pit to protect the surrounding area from heat and fire.

n: any drilling rig that is located on dry land. Compare offshore rig.

n: the rig that uses drilling on the land.

n: The structure used to support the crown blocks and the drillstring. Masts are usually rectangular or trapezoidal in shape and offer a very good stiffness, important to land rigs whose mast is laid down when the rig is moved. They suffer from being heavier

n: any of various types of drilling structures designed for use in drilling wells in oceans, seas, bays, gulfs, and so forth. Offshore rigs include platforms, jack up drilling rigs, semi-submersible drilling rigs, submersible drilling rigs, and drill ships. Compare land rig.

n: a blowout preventer stack mounted on top of the casing string at or near the surface of the ground or the water. Surface stacks are employed on land rigs and on bottom-supported MODUs.