The stress level is the key factor that affects the fatigue life of bottom hole assembly.
钻具组合在井下所承受的应力水平是影响其疲劳寿命的一个关键因素。
The basic assumptions, equations and boundary conditions for bottom hole assembly (BHA) analysis were discussed.
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 borehole deviation correction technique with bottom hole assembly and its application in Xinjiang oil Well YX-1 were introduced.
介绍了井底钻具组合纠偏技术及其在新疆YX - 1油井中的应用。
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。
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.
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。
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，并对力学模型进行了求解。
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.
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 paper presents the application, bottom hole assembly and parameter optimum of steering drilling system in Gangshen well 24-26. Meanwhile, the applied effect is analysed.
文中详细介绍导向钻井系统在港深24 -26井的应用情况、钻具组合、参数优选，并进行效果分析。
The paper presented 3 kinds of bottom hole assembly, analysed the advantages of downhole steering technique, discussed the problems such as rock carrying and recommended some solutions.
给出了3种钻具组合形式，分析了井下导向技术的优势，探讨了携岩等技术问题并推荐了解决办法。
It still is a difficult subject for most drilling engineers to predict and control well path by applying the mechanical analysis of bottom hole assembly and the rock-bit interaction model.
利用下部钻具力学分析和钻头与地层相互作用模型来预测和控制井眼轨道对于大多数钻井作业来说仍是一个难题。
A numerical model of bottom-hole assembly was developed and the differential equations of finite element for its dynamic analysis were derived.
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。
Stabilizer is not used or used seldom in gas drilling to ensure the downhole safety. At this time, bottom-hole assembly bends easily resulted in well deviation.
为保证井下安全，气体钻井常常不使用或少使用稳定器，此时钻具组合更易发生弯曲而引起井斜。
In oilfield experiment several different kinds of offset-axes bottom-hole assembly are applied in various formation and borehole size in order to study deviation controlling ability of it.
试验过程中，通过在不同地层、不同井眼尺寸条件下应用不同的偏轴钻具组合方式，研究偏轴钻具的防斜能力。
The critical buckling load is influenced by the pattern of bottom-hole assembly directly.
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.
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。
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