دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a floating offshore drilling structure that is towed to and from the drilling site. The unit has a streamlined bow and squared-off stern, a drilling derrick usually located near the middle of the barge, and a moon pool below the derrick through which drilling tools pass to the seafloor. It is identical in appearance to a drill ship, but is not self-propelled. It must therefore be towed to the drill site. Shipshaped barges are most often used for drilling wells in deep, remote waters. See floating offshore drilling rig.