斜直井眼中钻柱屈曲的可能性

本文应用虚位移原理,在充分考虑钻柱所处的特殊环境的基础上,考察了斜直井眼中钻柱屈曲的可能性。研究表明,在斜直井眼中钻柱的屈曲失稳与以前的模型大不相同,即在大多数情况下,斜直井眼中的钻柱并不会由于静轴向压力而失稳。由于有侧向分布力的作用,不是杆柱越长临界载荷越小。本模型更适合计算从垂直井到水平井的屈曲。文中对一些典型的钻柱进行计算.给出了在特定钻压下出现屈曲的临界井斜角。

POSSIBILITY OF DRILL STEM BUCKLING IN INCLINED HOLE

On the basis of energy method,the possibility of drill stem buckling in inclined straight hole is studied. The model shows that in most cases there is no probability of drill stem buckling. When deviated angle exists ,it is not true that the longer the drillstring, the smaller the critical axial load . The critical deviated angles are calculated, which indicate the possibilities of buckling under some classical drill pipe, given axial loads.