讨论了下部钻具组合分析的基本假设、基本方程和相应的边界条件。
The basic assumptions, equations and boundary conditions for bottom hole assembly (BHA) analysis were discussed.
下部钻具组合的具体方式将直接影响其所能承受临界失稳载荷的大小。
The critical buckling load is influenced by the pattern of bottom-hole assembly directly.
预测下部钻具组合(BHA)的造斜能力对准确控制井眼轨迹十分重要。
Accurate prediction of BHA deflecting capacity is very important for precise well trajectory control.
经现场5口井试验表明，不弯曲钻铤能够起到增大下部钻具组合刚度，控制直井段井斜的作用；
The on-site tests of 5 wells showed that the stiffness of lower drill pipe assembly was increased to control deviation in the straight hole.
考虑下部钻具组合的弯曲效应和接触状态，运用间隙无法对下部钻具组合进行了受力变形计算。
The force and deformation of bottom hole assembly (BHA)are calculated by the gap-element method, in consideration for the bending effect and contact state of BHA.
作为井下闭环钻井系统核心部分的下部导向钻具组合的力学特性，则成为形成井下闭环控制的基础。
The steering assembly is the key tool of the downhole closed-loop drilling system, and its mechanics properties are the base of downhole closed-loop control.
作为井下闭环钻井系统核心部分的下部导向钻具组合的力学特性，则成为形成井下闭环控制的基础。
The steering assembly is the key tool of the downhole closed-loop drilling system, and its mechanics properties are the base of downhole closed-loop control.
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