轴力作用下钻柱稳定性分析

Stability analysis of drill pipe under axial force

影响钻柱稳定性的因素很多,包括井斜角、轴向载荷以及扭矩等。从井斜角着手,重点分析了不同井斜角、不同刚度对钻柱屈曲载荷大小的影响。研究结果表明,在其他条件不变的情况下,钻柱屈曲载荷随着井斜角的增大呈非线性增大;相同井斜角下,钻柱刚度越大,屈曲载荷也相应增大;且当井斜角大于45°时,刚度大的钻柱屈曲载荷增大趋势更明显。

The stability of drill pipe is affected by many factors,including well inclination angle,axial load and torque and so on.The emphasis is placed upon the influence of the different well inclination angle and stiffness on the bulking load.A large amount of analyses show when other conditions keep unchanged,the bulking load of drill pipes increases nonlinearly with the well inclination angle;with the same well inclination angle,the lager the stiffness of drill pipes,the higher the bulking load;and when the well inclination angle is larger than 45°,the bulking load of drill pipes with higher stiffness increases more obviously.