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首页> 外文会议>SPE/IADC drilling conference >The Goodman Diagram as an Analytical Tool to Optimize Fatigue Life of Rotary Shouldered Connections
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The Goodman Diagram as an Analytical Tool to Optimize Fatigue Life of Rotary Shouldered Connections

机译：Goodman图作为优化旋转肩式连接疲劳寿命的分析工具

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There are many drilling programs in our industry today thatstretch the limits of existing drill pipe and a drill pipe failurein these holes can be expensive in lost time and lostequipment. The primary failure mode of the drill pipe isfatigue. As with the drill pipe tube, the tool joints are alsosubject to fatigue failure and are, in many cases, the weak linkin a drill string.Rotary shouldered connections are very simple, very ruggedmechanical devices that perform several functions during thedrilling operations. These functions include transfer oftorsional loads, transfer of tensile loads, transfer ofcompressive loads, transfer of bending loads, and containmentof pressure. In spite of the variety of the functions, theconnections must perform with zero tolerance for error andthey must be made-up and broken-out under adverseworking conditions.The failure or success of the rotary shouldered connections forall these functions depends on the amount of make-up torqueand shoulder load that is applied to the connection beforebeing put into service. As in many other cases, more is notalways better.This paper presents considerations and recommendations toimprove the fatigue life of rotary shouldered connections ondrill pipe and other drilling tools. These recommendations arebased on the stresses induced in the connection at make-upand the additional stresses resulting from the service loads.The analysis includes the effects of frictional properties of thethread compound and the possible adverse effects of drillingfluid being mixed with thread compound.
机译：当今我们行业中有许多钻探计划，这些钻探计划扩展了现有钻杆的极限，而这些孔中的钻杆故障可能会浪费大量时间和设备。钻杆的主要故障模式是疲劳。与钻杆管一样，工具接头也会遭受疲劳破坏，并且在许多情况下，它们是钻柱中的薄弱环节。旋转肩式接头是非常简单，坚固的机械装置，在钻孔操作中会执行多种功能。这些功能包括扭转载荷的传递，拉伸载荷的传递，压缩载荷的传递，弯曲载荷的传递以及压力的抑制。尽管功能多种多样，但连接必须在误差允许范围内保持零公差，并且必须在不利的工作条件下进行装配和断开。所有这些功能的旋转肩式连接的成功与否取决于制造数量。在投入使用之前，施加在连接上的最大扭矩和肩部负载。与在许多其他情况下一样，越多越总越好。本文提出了一些建议和建议，以改善钻杆和其他钻探工具上的旋转带肩连接的疲劳寿命。这些建议基于在连接时在连接处引起的应力以及由使用载荷引起的附加应力。分析包括螺纹化合物的摩擦性能的影响以及将钻井液与螺纹化合物混合的可能的不利影响。

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