深井钻机在下钻或下套管作业中，绞车电磁制动一旦失灵可能造成严重事故。
When the drawworks's electromagnetic brake is out of work in drilling or casing operation, serious accident will happen.
该系统实现无人监控、自动记录、绘制紧扣转矩—圈数曲线，可方便、直观地反映下套管作业的全过程及有问题套管所处的位置。
The system can record and plot the make up torque turn curves automatically, and it also can monitor whole process of casing job and find out the location of the casing with trouble.
通过对模型的求解，可以得到不同井眼类型、泥浆密度、悬浮长度以及不同下套管方案下的套管受力，为大位移井下套管作业提供了力学参考。
By solving the mechanical model, the casing bearing forces can be obtained under the conditions of different hole types, mud density, casing suspension length and casing running ways.
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