Semi-Submersible Drilling Rig (DP)

A dynamically positioned (DP) semi-submersible rig is a mobile offshore drilling unit. The purpose of the rig is to drill new wells, alter existing wells, or suspend or abandon older wells. A DP semi-submersible rig has a propulsion system so can move itself, although may be accompanied by tugs. Normally, multiple thrusters keep the rig in position, which means they can be used in greater water depths – not requiring foundations or anchors to the seabed.