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 mobile bottom supported offshore drilling structure with several compartments that are flooded to cause the structure to submerge and rest on the seafloor. Submersible rigs are designed for use in shallow waters to a maximum of 175 feet (53.4 metres). Submersible drilling rigs include the posted barge submersible, the bottle-type submersible, and the arctic submersible. See bottom-supported offshore drilling rig.