The riser's inner hollow core (a pipe within a pipe) is reserved for the drill string.
立管内部核心是空心的(管中管)，留给钻柱使用。
The crew attaches new lengths of pipe one by one from the top until the "drill string" is long enough to hit the seafloor.
船员们从这根钢管的顶部，一根一根地装上更多管道，直到这根“钻柱”足够长，能碰到海底。
The crew attaches new lengths of pipe one by one from the top until the “drill string” is long enough to hit the seafloor.
船员们从这根钢管的顶部，一根一根地装上更多管道，直到这根“钻柱”足够长，能碰到海底。
The accurate estimate of the drill string vibration and the corresponding technique are very important to protect the FEWD equipment and increase the comprehensive efficiency.
准确判断井下钻具振动并采取相应的技术措施对于有效保护FEWD测量仪器、提高钻井综合效益具有重要意义。
The driller sets the drill string in the slips or elevator.
司钻把钻具坐在卡瓦或吊卡上。
It is an inside BOP (blowout preventer)in the drill string.
投入式止回阀是钻柱内防喷器。
You must keep trying to find a new way to protect the drill string from sticking.
你们应当坚持设法找出防止钻具被卡的新方法。
The rotary carriage provides rotary and vertical motion to the drill string and bit.
转动滑架为钻柱和钻头提供转动和垂直移动。
Therefore, a drill string heave compensation system is needed to compensate the heave motion.
因此，需要采用升沉补偿系统对钻柱升沉运动进行补偿。
A new lithology identification method based on axial amplitude modulation signal of drill string is proposed.
提出了一种利用钻柱轴向振动调幅信号实现岩性识别的方法。
The results show that longitudinal vibration of drill string is relative to rotary speed and weight on bit (WOB).
实验结果表明，钻柱的纵向振动主要与转速和钻压有关。
The helical flow of power-law drilling muds in the drill string was studied both theoretically and experimentally.
本文从理论和实验方面研究了石油钻井泥浆常用的幂律液体在钻柱中的螺旋流动规律。
The flexible drill string is one of the key tools to materialize the high accuracy directional drilling technique.
挠性钻杆是实现高精度定向钻孔技术的关键器具之一。
A velocity wave and a stress wave resulting from the stress variation are transmitted downward along the drill string.
悬点的应力变化产生速度波和应力波沿钻杆向下传递。
However, the accident of drill string damage happened easily in the overthrust nappe belt of these regions in the drilling.
但是，在其逆掩推覆带钻井作业中，极易发生钻具失效事故。
Although most of kicks occur when pulling the drill string from the hole, it is also possible for kicks to occur while tripping in.
尽管大多数井涌都发生在起钻的时候，但下钻的时候也会发生井涌。
This article takes the near-bottom drill string in an extended reach well as the subject to study the drill string vibration rules.
以大位移井近井底的钻柱为研究对象，分析了钻柱振动行为所遵循的规律。
Describes drill string dynamics system models and numerical algorithms. And describes the details of NEWMARK method and HHT method.
介绍了钻柱系统动力学模型以及其数值算法，对直接积分法中的NEWMARK法和HHT法的计算过程进行了详细的阐述。
Finally, in order to control the well path by dynamics, great attention should be paid to the interaction between bit and drill string.
为了实现依据钻柱动力学的井眼轨迹控制，应特别重视钻柱振动特性与钻头受力状况的相互影响。
Light lateral and axis and torsion vibrations do not affect the normal work, but the resonance state has severity effect to drill string.
轻微的横向、轴向及扭转振动不影响钻井的正常作业，而钻柱的共振状态会对钻井产生严重的影响。
The drilling jar which is connected with drill tool and worked with drill string is a downhole stuck freeing tool in drilling operation .
随钻震击器是连接在钻具中随钻柱一起进行钻井作业的井下解卡工具。
Its main functions are maintaining borehole gage, improving drill string stability and protecting lower drill string from excessive wear.
其重要作用是保持钻头尺寸符合标准，提高钻杆稳定性，避免钻杆下部过于磨损。
It's main functions are maintaining borehole gage. Improving drill string stability and protecting lower drill string from excessive wear.
其主要作用是保持钻孔尺寸符合标准，提高钻杆稳定性，避免钻杆下部过于磨损。
When the force can not contact drill string with one side of the borehole wall, the stiffness of drill string can influence the contact force.
当外力不足以使钻柱紧贴于井壁的一侧时，钻柱的刚度对钻柱与井壁之间的接触力有影响。
The calculation results demonstrate the effective eccentricity and the lifting force of the upper drill string are the major influential factors.
计算结果表明，有效偏心距和上部钻柱的提升力是影响近井口套管偏磨的主要因素。
It has a practical meaning for the strength design and combination usage of drill string, casing and tubing under different technological conditions.
对处于不同工艺条件下的钻柱、套管、油管的强度设计和组合使用等均有实际意义。
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。
The effects of WOB fluctuation of drill string on the wellbore trajectory are analyzed by using stochastic finite element method and perturbation equation.
借助随机有限元方法和摄动方程初步分析了钻压波动对井眼轨迹的影响。
The signals we get at the top of the drill string and at the surface are continuous, so only after crosscorrelation can the useful information be available.
由于在钻柱顶端和地面接收到的信号是连续的随机信号，因此只有将两个信号互相关才能得到反映地下构造的有效信息。
The signals we get at the top of the drill string and at the surface are continuous, so only after crosscorrelation can the useful information be available.
由于在钻柱顶端和地面接收到的信号是连续的随机信号，因此只有将两个信号互相关才能得到反映地下构造的有效信息。
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