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首页> 外文期刊>Ocean Engineering >Longitudinal natural vibration of ultra-long drill string during offshore drilling
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Longitudinal natural vibration of ultra-long drill string during offshore drilling

机译：超长钻柱在海上钻井过程中的纵向自然振动

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Offshore drilling with ultra-long drill strings (i.e., longer than 10,000 m) creates a new class of technical challenges, such as dynamic variation of weight on bit (WOB). This article investigates observational data obtained from a drilling program conducted by the scientific drilling vessel Chikyu using an 8000 m drill string, which is first of their kind to be recorded. The data exhibited longitudinal oscillation of the drill pipe at frequencies higher than that of heave motion. To identify the cause of such oscillation, one-dimensional dynamic simulation to model drill string's behavior was carried out. The key component of this model is the detailed modeling of the heave compensator. Numerical experiments revealed that longitudinal natural vibration was excited in the ultra-long drill pipe, and the excitation modes corresponded to the behavior of a string with both ends fixed, indicating the possible influence of friction in the heave compensator. We named this class of phenomena compensator. induced vibration (CIV). In addition, longitudinal elasticity leads to divergence of the tension variation near surface and downhole WOB, which calls for the need to directly measure the downhole WOB behavior.
机译：使用超长钻柱（即长于10,000 m）的海上钻井带来了新一类技术挑战，例如钻头重量（WOB）的动态变化。本文研究了科学钻探船Chikyu使用8000 m钻柱从钻探程序获得的观测数据，这是有史以来的首次记录。数据显示钻杆在高于起伏运动频率的纵向振动。为了确定这种振荡的原因，进行了一维动态模拟以模拟钻柱的行为。该模型的关键部分是升沉补偿器的详细建模。数值实验表明，在超长钻杆上会产生纵向固有振动，其激励模式与两端固定的弦的行为相对应，这说明了升沉补偿器中可能存在摩擦。我们将此类现象称为补偿器。感应振动（CIV）。另外，纵向弹性导致在地面和井下WOB附近的张力变化的发散，这需要直接测量井下WOB行为。

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