关于钻柱一次弯曲临界条件的考证

An Investigation of Critical Condition of Drill String First Order Buckling

关于钻柱在钻压作用下,出现一次弯曲和二次弯曲时的临界受压长度,鲁宾斯基先后在1950年、1951年两次发表论文给出了其计算公式和值。对比了鲁宾斯基两篇论文的区别,回顾了鲁宾斯基有关垂直井钻柱屈曲理论在我国的应用情况,考察了鲁宾斯基对自己论文的态度,得出了钻柱一次弯曲的临界受压长度应该为1.94m,而不应该是目前广泛应用的2.04m。

Under the weight on the bit, first order and second order buckling might occur on drill string, which depend on the drill stem length subjected to axial compressive force. Lubinski published two formula to calculate the critical length and corresponding value in 1950 and 1951. The difference between two papers were compared, and the application of Lubinski＇s theory in China were reviewed. Lubinski＇s viewpoint on his own papers was examined and the conclusion is that the critical compression length is 1.94m not that commonly used 2.04m.