دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a type of mobile offshore drilling unit (MODU) that has a part of its structure in contact with the seafloor when it is on site and drilling a well. The remainder of the rig is supported above the water. The rig can float. however, allowing it to be moved from one drill site to another. Bottom-supported units include submersible rigs and jack up rigs. See mobile offshore drilling unit.

n: a drilling platform that rests on a steel or concrete caisson. Used mainly in the Arctic, caissontype drilling platforms are mobile offshore drilling units built to withstand the ravages of moving ice in Arctic waters.

n: a jackup drilling unit in which the drilling rig is mounted on two cantilevers that extend outward from the barge hull of the unit. The cantilevers are supported only at the barge end. Com- pare keyway.

n: see semisubmersible drilling rig.

n: (CDU) a drilling structure whose base is shaped like a truncated (cut off) cone. It is designed for drilling in offshore arctic waters, where moving ice can damage the structure. The cone shape helps deflect the ice around the base and keep it intact

n: a floating offshore drilling unit with the configuration of a ship but not selfpropelled. Compare drill ship.

n: a self-propelled floating offshore drilling unit that is a ship constructed to permit a well to be drilled from it. Although not as stable as semisubmersibles, drill ships are capable of drilling exploratory wells in deep, remote waters. See floating offshore drilling rig.

n: A specially designed ship used to drill a well at an offshore location.

n: refer to drilling unit

n: the acreage allocated to a well when a regulatory agency grants a well permit.

n: the general designation of the machinery and equipment used in drilling

n: a type of mobile offshore drilling unit that floats and is not in contact with the seafloor (except with anchors) when it is in the drilling mode. Floating units include barge rigs, drill ships, and semi-submersibles. See mobile offshore drilling unit.