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.
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.
投入式止回阀是钻柱内防喷器。
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.
讨论了初弯曲对钻柱横向非线性振动的影响。
The influence of the initial deflection on the nonlinear lateral free vibration of drill stem is discussed.
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.
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.
因此，需要采用升沉补偿系统对钻柱升沉运动进行补偿。
Therefore, a drill string heave compensation system is needed to compensate the heave motion.
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.
钻柱在井下的受力极度复杂，甚至工作在腐蚀的介质中。
A drilling string works in a very complex stressed environment downhole, even in corrosive media.
文中利用能量法，研究了等曲率井眼中钻柱的稳定性问题。
In this paper, the problem about stability of the drill stem in the borehole with iso-curvature is studied by use of energy method.
本文提出了整体钻柱三维静力学模型并利用有限元法求解。
The paper presents a three - dimensional static model of the whole drill-string, and the model is solved by finite - element method.
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.
高钻柱扭矩和套管过度磨损是小井眼钻井中存在的严重问题。
Heavy torque and abrasion on casing are serious problems in drilling in slim hole.
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.
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。
The drilling jar which is connected with drill tool and worked with drill string is a downhole stuck freeing tool in drilling operation .
附加系统质量越大，受到激励后的振幅越大，对钻柱的减振作用越显著。
And the larger the mass of the additional system, the greater the amplitude formed after exciting, the more obvious the amortization effect on drilling string.
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.
两个悬臂则固定在支架的内部结构上，并允许管架从贮存位置降到钻柱中线上。
The swing arms are fastened to the inside structure of the mast, and permit the pipe rack to be low-ered from the stored position to the centerline of the drill string.
目前对钻柱横向振动的研究基本上忽略了横向振动的激发来源和轴向力的存在。
At present, axial load and excited origin of drilling string lateral vibration is usually neglected.
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.
随转速的增加，钻柱的横向运动逐渐由规则摆动向无规则摆动和规则反向涡动转化。
With the increase in rotary speed, the motion state of drill string will be successively transformed from regular swaying into irregular swaying and regular whirling.
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.
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.
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