旋挖钻机提钻速度对井壁稳定的影响分析

Analysis on Influence of Withdraw Speed of Rotary Drilling Rig to Borehole Stability

摘要:

介绍了用旋挖钻机施工桩孔提钻时孔内波动压力的产生和井壁稳定原理,建立了井内波动压力的计算模型,分别分析和计算了各施工工艺参数产生的波动压力值,给出了许用提钻速度的计算方法.

关键词:旋挖钻机;提钻速度;波动压力;井壁稳定;许用起钻速度;旋挖钻机;速度;井壁稳定;影响分析;Stability;Borehole;Drilling Rig;Speed;Influence;计算方法;许用;压力值;波动压力;工艺参数;计算模型;稳定原理;孔内;桩孔;施工

Abstract:

The occurrence of slurry surge pressure and stability principle of borehole during bit-raising of the rotary drilling rig were introduced here. Computation model of surge pressure was also established in this paper. Surge pressure produced with each construction technological parameter was separately analyzed and calculated, and the calculating method of allow- able withdraw speed was presented.

Key words:rotary drilling rig; withdraw speed of drill rod; slurry surge pressure; borehole stability; allowable withdrawspeed