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.
建立了底部钻具组合动态分析的数值模型，推导了动态分析的有限元微分方程。
A numerical model of bottom-hole assembly was developed and the differential equations of finite element for its dynamic analysis were derived.
该程序通用性强，计算精度高，简单省时，适用于各种底部钻具组合的模拟计算。
The computer program developed according to analysis results has the advantages of universal application, higher accuracy, simplicity and time saving.
采用静力分析的方法，建立了偏心钻头底部钻具组合的力学模型，并对力学模型进行了求解。
A mechanical model of bottom hole assembly (BHA) with eccentric bits is established and the solution of this model was given by means of numerical method.
采用静力分析的方法，建立了偏心钻头底部钻具组合的力学模型，并完成了对力学模型的求解。
A mechanical model of bottom hole assembly (BHA) with eccentric bits is established and the solution of this model was given by means of numerical method.
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.
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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