CAJ | 학술논문

在考虑了钻杆接头、轴向力、钻杆重量以及钻杆本体与井壁接触等因素的前提下，应用平面弹性梁理论建立了钻杆在轴向拉力、轴向压力和轴向力为零时钻杆的最大弯曲应力计算模型。运用该模型计算出的钻杆最大弯曲应力远大于按井眼曲率计算的弯曲应力，这说明钻杆接头对钻杆弯曲应力的分布有较大的影响。在计算钻柱强度时，应考虑接头对钻杆弯曲应力的影响，以实现安全钻井。
재고필료찬간접두、축향력、찬간중량이급찬간본체여정벽접촉등인소적전제하，응용평면탄성량이론건립료찬간재축향랍력、축향압력화축향력위령시찬간적최대만곡응력계산모형。운용해모형계산출적찬간최대만곡응력원대우안정안곡솔계산적만곡응력，저설명찬간접두대찬간만곡응력적분포유교대적영향。재계산찬주강도시，응고필접두대찬간만곡응력적영향，이실현안전찬정。
Based on the planar beam theory, the models for calculating the maximum bending stress of drilling rod under axial tensile load, compressive load, and zero load are given,in consideration of the effects of tool joint, axial force, drilling rod weight, and attachment of drilling rod with the wall of wellbore on bending stress of drilling rod. The results of calculation using those models show that the maximum bending stress in the drilling rod is much larger than that calculated using the method of assuming the drilling rod bending with wellbore curvature. The effect of tool joint must be considered in analysis of drillstring strength to reduce drillstring failure and keep safety in drilling process.