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利用能量方法研究了轴向载荷和扭矩共同作用下钻柱的屈曲问题 ,着重研究了扭矩对钻柱屈曲的影响 ,理论分析和实验验证均发现 ,轴向载荷、井斜角和扭矩是影响钻柱屈曲的重要因素。当其他条件相同时 ,钻柱的屈曲载荷随井斜角的增加而增加 ,呈非线性 ;扭矩使钻柱的屈曲载荷明显降低 ,并且随井斜角的增大 ,降低的幅度减小 ;扭矩值越大 ,钻柱的刚度越小 ,钻柱屈曲载荷的降低程度就越显著。
The buckling of drill string under the action of axial load and torque is studied by energy method. The effect of torque on the buckling of drill string is studied emphatically. Theoretical analysis and experimental verification show that the axial load, Column buckling of the important factors. When the other conditions are the same, the buckling load of the drill string increases with the increase of the inclination of the well, which is nonlinear. The torque reduces the buckling load of the drill string obviously and decreases with the increase of the well inclination. The torque The greater the value, the smaller the stiffness of the drill string, the more significant the reduction in the buckling load of the drill string.