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- turbo drill string 涡轮钻具
- The drill string is rotated by rotary table. 钻柱是由转盘驱动的。
- Saltwater mud is known to have a very strong corroding effect on drill string. 人们知道,盐水泥浆对钻具有很强的腐蚀作用。
- Displace mud with 30 SPM each 30 minutes while working the drill string. 每30分钟顶替泥浆30冲，同时活动钻柱。
- 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。
- Analysis of friction on drill string in horizontal drilling. 水平井管柱下入摩阻分析及应用。
- 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。
- In the course of sidetracking of horizontal holes, lateral drill string vibration often occurs. 在水平井的侧钻过程中,钻柱很容易发生横向振动,引发钻柱失效、井眼扩径等严重事故。
- 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。
- 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。
- An example proved the view, while the WOB is transferred by spring and fluid pressure, the vibration of drill string can lie diminished. 实例分析验证了这种观点。同时由于压力是靠弹簧和液压传递的，所以其还有减振的效果。
- Therefore we can provide the preanalysis and treatment plans for similar drill string falling accident,so as to shorten accident-losing tim... 为现场处理类似的钻柱落井事故提供预先的分析和处理方案,以缩短事故处理时间,减少经济损失。
- Based on the interaction of bit and formation, the force from the rock and bit is used for the boundary condition of the end of the drill string. 在建立了牙轮钻头与井底岩石互作用模型的基础之上,将钻头与井底岩石互作用力矩作为钻柱的下端边界条件。
- A multithread wireless system is developed to measure the four-component forces acting on a simulated drill string on a LabVIEW workbench. 为分析钻杆的井下受力状态,应用直梁应变片式测力传感器,研制了一种基于虚拟仪器平台的钻杆四分量力测量系统。
- The bigger the effective eccentricity, the higher the upper drill string's lifting force, the higher the positive pressure on casing/ drill string, and the more serious the wear. 有效偏心距越大，上部提升力越大，套管/柱之间的正压力将越大，磨损将越产重。
- The analyze of this paper is based on the practice, it can provide bases to Straight Well as well as ERW drill string dynamic problem, it is valuable in engineering. 本文的分析切合实际，对直井及大位移井钻柱因振动而引起的动态问题的分析提供依据，具有工程使用价值。
- Fluid is conveied to bit nozzel through drill string from pump is a transient state flowing with pressure wave, which makes the fluid jetted out from nozzel has certain pulsation. 从钻井泵经过钻柱内部输送到钻头喷嘴的流体是一种瞬态流动，存在着压力行波，使从普通喷嘴射出的流体有一定程度的脉动。
- The drill string of ERW is taken as research object, the dynamic problem is brought forward during making hole, and the mechanics model about each dynamic action is established. 以大位移井钻柱的部分或整体为研究对象，提出了钻井各种动态问题，建立了钻柱的各种动态行为的力学模型。
- The classical fracture mechanic can only explain the static fracture problem of drill string, but it is incapble of explain drill string failure under dynamic load. 传统的断裂力学只能解释石油管柱静态断裂问题，而不能解释动载下钻柱失效问题。
- 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。
