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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering 2007(OMAE2007) vol.2; 20070610-15; San Deigo,CA(US) >FRICTION CONSIDERATIONS IN ROTARY SHOULDERED THREADED CONNECTIONS
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FRICTION CONSIDERATIONS IN ROTARY SHOULDERED THREADED CONNECTIONS

机译：旋转肩式螺纹连接中的摩擦注意事项

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摘要

The new connection designs introduced by the drill pipe manufacturers (double shoulder connections, intelligent drill pipes or any new design for increased torque resistance) make the use of the Farr formula for calculating proper assembly torque more problematic. Additionally, severe drilling conditions like HPHT, directional drilling and extreme environments are affecting critical thread compound performance properties, which can make it impossible to attain the optimum makeup torque for the connection. The new drilling conditions are exposing the drill string components to higher loads and consequently reduce the safety margins. Since the makeup process is the only way to control and achieve the maximum tool joint loading capacity, it becomes important to understand the effect of friction on optimum makeup torque calculation. This paper presents a modified equation for optimum makeup torque calculation by using the latest research on thread compound frictional properties. Also, the thread compound lubrication mechanism will be explained. For the first time the thread turn load will be related to the optimum makeup torque. The paper will also explain why there is a need for a new API standard for determining thread compound frictional properties. The formula developed herein, based on experimental results, demonstrates that the newly introduced overall factor may differentiate between used and new connections.
机译：钻杆制造商引入的新连接设计（双肩连接，智能钻杆或任何新的设计以提高扭矩抵抗力）使使用Farr公式来计算适当的装配扭矩更加困难。此外，HPHT，定向钻孔和极端环境等严酷的钻孔条件正在影响关键的螺纹化合物性能，这可能无法为连接获得最佳的补充扭矩。新的钻井条件使钻柱部件承受更高的负荷，因此降低了安全裕度。由于补给过程是控制并实现最大工具接头负载能力的唯一方法，因此了解摩擦对最佳补给扭矩计算的影响就变得很重要。本文通过对螺纹复合材料摩擦特性的最新研究，提出了一种用于优化补偿扭矩的修正公式。另外，将说明螺纹复合润滑机构。第一次，螺纹车削负载将与最佳补充扭矩有关。本文还将解释为什么需要新的API标准来确定螺纹复合材料的摩擦性能。根据实验结果，本文开发的公式表明，新引入的总体因素可能会区分使用的连接和新的连接。

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