In this paper, the design and analysis considerations for the ENSCO I Barge on Barge (BoB) drilling unit are outlined. The ENSCO I BoB will operate offshore Balikpapan, Indonesia in a very challenging environment generally described by shallow water with large tidal variations. The BoB is comprised of the ENSCO I drilling barge with a new-build mat (support barge) added on its bottom. The ENSCO I is an existing ABS Classed drilling barge initially designed for use in Lake Maracaibo in a floating mode. Thus, it did not have shallow draft transit capability, the ability to sit on-bottom nor to work in varying tidal conditions. A solution was to design and fabricate a mat to put underneath the ENSCO I drilling barge. The BoB is intended to transit in the afloat mode on the new mat. A significant ocean voyage from Singapore to Balikpapan will be followed by short duration field moves. Drilling operations are conducted with the BoB sitting on the sea bottom. Due to the high tidal variations, a ballast tank tidal flooding system was designed to avoid excess buoyancy on the BoB during high tide as well as excess on-bottom weight during low tides. The design and analysis considerations relating to mat sizing, mat design, global strength in the transit mode and on-bottom mat strength while drilling will be outlined. We will also discuss the mechanical systems provided in the mat as well as modifications to some of the ENSCO I systems.
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机译：本文概述了驳船（鲍勃）钻探单元上的ENSCO驳船的设计和分析考虑。 Ensco I Bob将在印度尼西亚offshore Balikpapan运营，这在一个非常具有挑战性的环境中，通常由浅水进行大的潮汐变化。鲍勃由底部钻探驳船组成，其中底部添加了一个新的构建垫（支持驳船）。 ENSCO我是现有的ABS型钻井驳船，最初专为在浮动模式下使用的Maracaibo湖。因此，它没有浅水过渡能力，坐下的能力，也不能在不同的潮气条件下工作。解决方案是设计和制造垫子以放置在Ensco I钻井驳船下面。鲍勃旨在在新垫上以漂浮模式传输。新加坡到巴利克普山的一系列大量海洋航程将随后是短持续时间的发展。钻孔操作与鲍勃坐在海底上进行。由于潮汐变化高，镇流器罐潮汐洪水系统旨在避免在低潮中的鲍勃上的过度浮力，并且在低潮期间底部重量过量。钻孔钻孔尺寸，垫设计，全局强度和底部垫子强度有关的设计和分析考虑将概述钻孔。我们还将讨论垫中提供的机械系统以及对某些ENSCO I系统的修改。
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