Landing string design and strength check in ultra-deepwater condition

Zhang Hui; Gao Deli; Tang Haixiong

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Landing string design and strength check in ultra-deepwater condition

机译：超深水条件下的起落架设计和强度检查

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Landing string used in ultra-deepwater casing running operations sustains complicated loads, including axial load, slip crushing load, bending load and dynamic load. Landing string design methods based on tension load are presented in detail. In these methods, sufficient margin of over pull is taken into account for the extreme axial load during surface casing running operations and environment loads caused by wave, current and vessel offset and heave. Landing string strength check is discussed to evaluate the safety of landing string in harsh environment. According to the analysis, slip crushing capacity is one of the critical limitations for landing string; bending stress caused by currents is great at the top of landing string at the beginning of operations while it will decrease by adjusting the vessel position after setting the casing below mud line.

机译：在超深水套管运行中使用的着陆柱承受着复杂的载荷，包括轴向载荷，滑移破碎载荷，弯曲载荷和动态载荷。详细介绍了基于拉力载荷的起落架设计方法。在这些方法中，考虑到表层套管运行操作期间的极端轴向载荷以及由波浪，水流和船只的偏移和升沉引起的环境载荷，要考虑到足够的拉力裕度。讨论了起落架强度检查，以评估在恶劣环境下起落架的安全性。根据分析，打滑能力是着陆管柱的关键限制之一。在作业开始时，由电流引起的弯曲应力在着陆管柱的顶部很大，而在将套管置于泥线以下后，通过调节船的位置将减小弯曲应力。

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《Journal of natural gas science and engineering》 |2010年第4期|共5页
作者
Zhang Hui; Gao Deli; Tang Haixiong;
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正文语种 eng
中图分类石油、天然气工业;
关键词
Ultra-deepwater drilling; Landing string design; Strength check; Bending stress; Dynamic load;

机译：超深水钻井;起落架设计;强度检查;弯曲应力;动态载荷;

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Landing string design and strength check in ultra-deepwater condition

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