短半径水平井铰接式钻柱串整体力学分析

Mechanical Analysis of Articulated Drilling String for Small radius Horizontal Well

通过力学分析，推导出计算钻压的迭代公式，即建立了计算井底钻压的力学模型．由此式不仅可以确定钻压与大钩负荷之间的关系，还可以确定任一铰链处的受力状况．随着大钩负荷的增加，井底钻压减小，同时，从井底到井口的各铰链处受力逐渐加大．

The recursion formula for calculating WOB are established by means of the mechanical analysis.On the basis of this, the relations between WOB and hook load can be defined, the force exerted at every articulated joint can be calculated. As the hook load is increased, the WOB is decreased and the force on the articulated joint is weighted from the bottom hole to the top of well.