应用数值计算方法，分析了偏心钻头底部钻具组合的受力和变形特性。
The mechanical properties and the deformation characteristics of the BHA with the eccentric bit are analyzed.
在计算底部钻具组合的受力和变形时，以前一般都是按弯矩为零的条件来确定其上切点的位置。
The tangency point of Bottom Hole Assembly is located at where the drill string just touches the wall of the borehole, and the contact force is zero here.
通过对底部钻具组合受力变形分析、地层力的计算及井壁变形影响分析，提出了钻具结构集度的概念和计算方法；
The concept and calculating method are suggested based on the deformation analysis of BHA, calculations of formation forces, and analysis of wal1 deformation effects.
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