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- screw drilling string 螺杆钻具
- The drill string is rotated by rotary table. 钻柱是由转盘驱动的。
- 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。
- This paper analyses how the whipstocking screw drill tools easily trip in casing. 因此，结构弯角必然较大，这就提出了这种钻具在套管内能否顺利下入的问题。
- The operation performance of PDC bits with screw drill tool appplied now in oilfield were analyzed comprehensively. 综合分析了目前使用的PDC钻头和螺杆钻具工作特性。
- 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。
- The time-domain response model of flaw long screw drill and pour pile was established based on the damped wave equation of pile-soil interaction system. 从桩-土系统共同作用的波动阻尼方程入手,建立了成层土中缺陷长螺旋钻孔灌注桩的时域响应模型。
- 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。
- 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。
