通过对钻头处受力情况的深入分析 ,否定了以前在分析底部钻具组合时 ,将钻头处的边界条件看作铰支 (即弯矩为零 )的一惯做法 ,提出了应先将钻头处看作是固支 (即转角为零 ) ,只有当弯矩达到一定值时 ,才能出现转角的新观点 ,并给出了计算弯矩最大值的公式 ,通过算例对比了 2种处理方法的差别。 Through in-depth analysis of the forces at the drill bit, it denied the conventional practice of considering the boundary conditions at the drill bit as the hinge (ie, the bending moment is zero) when analyzing the bottom hole assembly, and proposed that the bit Is regarded as the branch support (ie, the corner is zero). Only when the moment reaches a certain value can a new viewpoint of the corner appear, and the formula for calculating the maximum value of the bending moment is given. By comparing the two methods The difference.