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美国海洋钻探与开发公司和日本Kokan k.K.公司联合研制了一种可常年在阿拉斯加波弗特海区作业的半潜式平台—“北极机动钻井平台”。该平台是由一个16面圆锥形壳体组成的全钢重力结构,其底座直径为662英尺,主甲板面积为139000平方英尺,整个平台高511英尺。这个大型平台共用钢130000吨,所有外露部分均采用耐低温材料。为了适应在冰海区拖曳和作业,该平台具有以下特点: 由于是全钢结构,改进了吃水的局限性;
US Marine Drilling & Development Company and Japan’s Kokan K.K. jointly developed a semi-submersible platform that can be used all year round in the Beaufort Sea, Alaska, the “Arctic Mobile Drilling Platform.” The platform is an all-steel gravity structure consisting of a 16-sided conical shell with a base diameter of 662 feet, a main deck area of 139,000 square feet and an entire platform height of 511 feet. This large platform shared steel 130,000 tons, all exposed parts are used low temperature materials. In order to adapt to the towing and operation in the icy sea area, the platform has the following features: Due to the all-steel structure, the limitation of draft is improved;