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A multibody dynamical model of full-hole drillstring system
Author(s): 
Pages: 753-758
Year: Issue:  4
Journal: Acta Petrolei Sinica

Keyword:  full-hole drillstring systemmulti-body dynamical modelabsolute nodal coordinate formulationcoupled vibrationwhirling;
Abstract: 采用绝对节点坐标法建立了三维井眼全井钻柱系统多体动力学模型,将大长细比全井钻柱离散为绝对节点坐标梁单元,讨论了梁单元格式,并研究了井口、钻头处边界以及钻柱与井壁的接触/摩擦模型,给出了包含绝对节点坐标梁单元的钻柱系统运动方程.采用向后差分法求解微分-代数方程组,全面计算分析了全井钻柱系统的受力变形、摩阻扭矩、耦合振动、涡动、动力屈曲等力学特性,可在钻柱动力学研究和工程应用中发挥作用.
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