A drill assembly is typically a few tens of metres long and can only hold a core of ice of the same length.
一个钻取机通常有数十米长而且只能获取一个与之等长的冰芯。
A mechanical model for the offset-axes pendulum drill assembly (OAPDA) was established according to the continuous beam theory and the d.
运用纵横弯曲连续梁理论和达朗伯原理，建立了偏轴钟摆钻具组合动力学分析模型。
For every piece, the stiff, hollow pipes that connect the drill assembly with the rig at the surface have to be assembled as the drill is lowered and dismantled when it comes up again.
每一段坚实、中空的连接钻取机索导管的冰芯只能被切碎，因为钻取机再次出来时变得更低了也更细了。
Argue in public but come home with drill bits and a self-assembly wardrobe.
可以在公共场合争论，但是一起将钻头和自助安装的衣柜带回家。
For a continuous steering drill tool assembly, because there is crew in it, any transient forced deformation has its special characters.
对于连续导向钻具组合来说，由于其弯螺杆的存在，使得其在任何一个瞬态的受力变形都有其独特的特征。
All the tools include principal of the drill tools, overshot assembly, drill rods, holding dog, circle wrench and etc.
整套钻具包括：钻具总成、打捞器、钻杆、绞车、提引器、夹持器及自由钳等部件。
The wireline retrievable drill lock assembly is the heart of the casing drilling system.
带电缆可回收的钻井锁组合是套管钻井的核心部分。
The feature of designing farm machine is analysised based on seed drill. A kind of framework for intelligent CAD system based on parameter-design technics and assembly model is advanced.
以播种机设计为例，分析了农业机械设计的特点，提出了基于参数设计和装配模型的智能设计系统框架。
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.
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 fixed structure of a keyless drill chuck lower housing has the characteristics of simple structure, convenient assembly, reliable connection and reduction of cost.
本实用新型具有结构简单、装配方便、连接可靠和降低成本的特点。
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。
Numerical simulation shows that the new method is more effective for the drill-string assembly unsuitable to be simplified as a torsion pendulum.
数值模拟结果表明，对不适于简化为扭转摆的钻柱系统，采用基于钻柱扭转杆模型的新方法进行设计可以取得相对较好的减振效果。
The rotary and carriage assembly is adapted to apply rotational, thrust and pull-back forces to the drill pipe.
旋转和机架组件用于向钻杆施加旋转、推进和回拉力。
The rotary and carriage assembly is adapted to apply rotational, thrust and pull-back forces to the drill pipe.
旋转和机架组件用于向钻杆施加旋转、推进和回拉力。
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