自升式钻井平台穿刺分析 |
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引用本文: | 戴兵,段梦兰,宋林松,董楠. 自升式钻井平台穿刺分析[J]. 科技导报(北京), 2010, 28(17): 63-66 |
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作者姓名: | 戴兵 段梦兰 宋林松 董楠 |
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作者单位: | 1. 中国石油大学(北京)海洋油气研究中心,北京 1022492. 中海油田服务股份有限公司,北京 101149 |
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摘 要: | 自升式钻井平台是近海石油和边际油田开发的重要设备。据统计,穿刺事故占自升式钻井平台总事故的比例超过了50%,造成平台严重损坏和人员伤亡。以Arab drill 19自升式钻井平台和中国某自升式钻井平台的穿刺事故为例,分析穿刺事故发生的原因,说明穿刺事故的危害。采用投影面积法,分析了中国某自升式钻井平台在渤海某井位发生穿刺事故的可能性,结果表明,该平台存在较大的穿刺风险,并预测了穿刺后的插桩深度。对比平台实际插桩深度,预测结果存在较大误差。结合穿刺研究的最新成果,分析两者存在误差的原因:实际插桩过程中,桩靴底部将形成砂土塞,该砂土塞会极大地提高土体的极限承载能力,导致实际插桩深度比预测插桩深度浅。
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关 键 词: | 自升式钻井平台 穿刺 投影面积法 砂土塞 |
收稿时间: | 2010-05-18 |
Investigation of the Punch-through in Jack-up Rigs |
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Abstract: | Jack-up rigs are widely used in offshore oil and marginal oil field development. According to statistics, punch-through accidents account for more than 50% of jack-up rigs' accidents, leading often to serious damages of the jack-up rigs and casualties. Taking the Arab drill 19 jack-up and a Chinese jack-up as examples, the causes of the accidents and the seriousness of consequences are analyzed. The projected area method is used to study the possibility of punch-through for a domestic jack-up at a well site in Bohai Bay. It is found that the punch-through risk at the well site is high. The calculated penetration depth does not agree very well with the actual operational record, with a great error, which is analyzed in this paper based on new research results of punch-through. It is shown that during punch-through in a jack-up rig, a sand plug will be formed under the spudcan of the jack-up rig, which increases the ultimate bearing capacity of soil, and reduces the actual depth. |
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Keywords: | jack-up rig punch-through projected area method sand plug |
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