立管内部核心是空心的(管中管)，留给钻柱使用。
The riser's inner hollow core (a pipe within a pipe) is reserved for the drill string.
根据动力学理论建立钻柱动力学振动方程。
Dynamic vibration equation of drilling string is established based on the theory of dynamics.
转动滑架为钻柱和钻头提供转动和垂直移动。
The rotary carriage provides rotary and vertical motion to the drill string and bit.
给出了钻柱轴向振动的固有频率和振动传输公式。
The formulas for calculating natural frequency and vibration transmission ratio are given.
钻杆的单根长度越长，钻柱所能承受的临界载荷越小。
The longer the single drill pipe, the lesser the critical compressive force of drill stem.
钻柱在井下的受力极度复杂，甚至工作在腐蚀性介质中。
The pressure of the under well drill rod which even works in the caustic medium is extremely complex.
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。
A new lithology identification method based on axial amplitude modulation signal of drill string is proposed.
在定向井及丛式井的转盘钻进中，旋转钻柱会产生方位漂移。
The rotary drill stem will engender direction drift in rotary drilling of directional well and cluster well.
文章针对钻井工程中钻柱横向振动的实际情况，建立力学模型。
This paper analyzed the practical situation of drilling string lateral vibration during drilling, established mechanical model.
提出了一种钻柱强度计算新方法，可用于钻柱的强度设计和强度校核。
A new method for calculating drill stem strength can be applied to designing and checking strength of drill stem.
探讨了非线性有限元在预测水平井钻进中的钻柱扭矩及钻头前进方向的应用。
This paper discusses the prediction of the drill stem torque and bit forward direction in an offshore horizontal well by nonlinear FEM.
钻柱将其扭转振动传至钻机动力头，引起动力头齿轮传动系统的非线性振动。
The BHA transmits its torsional vibration to the gear system of drill power pack and brings about nonlinear vibration.
预防钻柱螺纹失效事故发生和提高螺纹连接使用寿命的技术长期以来倍受关注。
The people pay attention on raising the span of the usage of the thread of drill collars and preventing the accident of drill string thread failure.
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 crew attaches new lengths of pipe one by one from the top until the "drill string" is long enough to hit the seafloor.
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。
It has a practical meaning for the strength design and combination usage of drill string, casing and tubing under different technological conditions.
方钻杆之后带动整个钻柱进行旋转，由于方钻杆是与钻柱的顶部用丝扣连接在一起的。
The kelly then turns the entire drillstring because it is screwed into the top of the drillstring itself.
研究表明，水平井眼中钻柱所能承受的临界载荷和所使用钻杆的单根长度有密切关系。
The research indicated that the critical compressive force of drill stem in horizontal well is closely related with the length of single drill pipe in use.
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 helical flow of power-law drilling muds in the drill string was studied both theoretically and experimentally.
初步确立了空气钻井钻柱冲蚀磨损机理，提出钻屑冲蚀是促使钻具失效的一项重要原因。
Establish the erosive wear mechanism of drilling string in air drilling and put forward that erosion wear is a substantial cause to promote drill string failure.
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。
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.
钻柱裂纹成核、扩展、刺漏等事故及断裂的控制是确保钻杆在钻井中运行安全的重要措施。
The control that accidents and fractures of crack nucleation, propagation and washout in drill pipes are importance steps to keep drill pipes safe run.
开展油田钻柱失效分析与预防对提高钻井速度、降低钻井成本及井下安全钻进具有重要意义。
It is very important for improving drilling rate, reducing drilling cost and safety drilling to carry out drill stem failure analysis and prevention.
石油钻柱的失效80 %以上都为疲劳破坏，这与钻柱在弯曲和扭转组合下的交变应力有关。
The fatigue rupture made up 80 percent of the total petroleum drillstring failures, which is related to the flexural-torsional alternate stress acted on drillstring.
为进行打捞或回收钻柱，通常的卸开作业总是采用反扭矩，和在所选用的丝扣连接内引爆炸弹。
To facilitate the fishing or recovery operation, the backoff is usually accomplished by applying reverse torque and detonating an explosive charge inside a selected threaded connection.
针对以上难题，利用有限元法研究了钻柱在井底的二重非线性(几何非线性和接触非线性)问题。
Thus the finite element method is used to study the duplex nonlinearity (geometric nonlinearity and contact nonlinearity) of the drill string at the well bottom.
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。
Finally, in order to control the well path by dynamics, great attention should be paid to the interaction between bit and drill string.
以上计算和分析的结果，对气动潜孔锤短钻柱系统优化设计和钻井工艺的采用具有实际应用价值。
The optimum design of DTH drilling system and the adoption of drilling technology can be developed based on the data and result.
以上计算和分析的结果，对气动潜孔锤短钻柱系统优化设计和钻井工艺的采用具有实际应用价值。
The optimum design of DTH drilling system and the adoption of drilling technology can be developed based on the data and result.
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