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- The dynamic boundary condition between revolving drill string and borehole wall is one of the fundamental research contents of drilling string dynamics and torque and drag calculation. 旋转钻柱与井壁的碰撞摩擦边界是钻柱动力学研究和摩阻扭矩计算的基础研究内容。
- 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。
- drilling string dynamics 钻柱动力学
- The drill string is rotated by rotary table. 钻柱是由转盘驱动的。
- Prediction method of drilling string dynamic behaviors based on BP artificial network 基于BP人工神经网络的钻柱动态行为预测方法
- Analysis of friction on drill string in horizontal drilling. 水平井管柱下入摩阻分析及应用。
- 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。
- An analytical model, based on dynamics and plane wave propagation through the drill string, has been developed to depict the process of jarring and to analyze the factors related to impact. 文章运用弹性波理论与动力学分析相结合的方法研究震击器解卡动力学过程,提出利用震击力和震击冲量来衡量震击器解卡效果。
- The rod string dynamics model including the influences of rod-fluid-tubing viscous friction and rod-tubing Coulomb friction is developed. 在建立定向井有杆抽油系统的预测数学模型时 ,计入了杆液管粘性摩擦和定向井井斜造成的杆管库仑摩擦 ,同时考虑了实际泵况对系统的影响。
- 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。
- 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。
- 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。
- The major reasons are:the lateral vibration caused by the mass imbalance force,the drilling string whirling and collision. 带扶正器下部钻柱组合失效的主要原因有二：一是下部钻柱的质量不平衡引起横向振动；二是钻柱进动和碰摩。
- 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。
