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Single steel drilling caisson
Single steel drilling caisson is a drill barge that was built for year-round oil exploration in shallow ice-covered waters in the Beaufort Sea. The unit, initially named ''SSDC'' and later shortened to ''SDC'', was converted from an old oil tanker (''Ujigawa Maru'', later ''World Saga'') in the early 1980s. It has been used to drill a total of eight oil wells on both Canadian and U.S. continental shelves, the most recent in 2006.
== Description ==
The hull of the single steel drilling caisson consists of the forward two thirds of the hull of a very large crude carrier which is long and wide, and measures from keel to main deck. The original 80,000-tonne〔 drilling unit sits on top of a 35,000-tonne submersible barge that acts as an artificial steel berm when the unit is lowered to the seafloor using water ballast.〔 While on location, a box-type skirt prevents it from sliding sideways and an air injection system helps to overcome the suction effect during de-ballasting. The unit has six Caterpillar D399 diesel generators rated at 1,000hp each for onboard power generation, but since it has no propulsion of its own, it has to be towed to location.〔
On the topside, the single steel drilling caisson has a standard 20,000 square feet land rig. The drilling mast and substructure have a rated capacity of 1,300,000lbs and can be skidded to drill a well to the maximum depth of through any of the four moon pools. Internally, the drilling unit can hold enough supplies to drill three to five wells depending on the well depth.〔 In addition to drilling equipment, the topside includes two cranes, a helicopter platform, and accommodation for 90 workers.〔Arctic thaw. (New Technology Magazine, December 2005 ). 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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