Bottomhole choke
18 July 2017
Box
18 July 2017

Bottom-supported offshore drilling rig

A type of mobile offshore drilling unit (MODU) that has a part of its structure in contact with the sea floor 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 jackup rigs. See Mobile offshore drilling unit.