钻探施工中坍塌与缩径地层的处理

孔壁的坍塌或缩径主要是由于岩石破碎、松散无胶结或胶结成度很差、易被溶蚀、水化膨胀等特征,在外界条件(孔壁岩石受力的变化,冲洗液的性能,冲洗液的浸泡与冲刷,钻具的震动与敲击,升降钻具的压力激动、钻进技术参数与操作等)的作用下而发生的,正确的处理好这个环节是钻孔安全、优质、高效施工的必要条件。

Disposition of Formation Collapse and Drawdown in Process of Drilling

The collapse or the dramdown on the wall of holes is caused by the rocks and is caused by the functions of the outside condtions,snch as the change of the power the rocks on the wall of hole bear,the property of the flushing fluid,the soakage and erosion of the flushing fluid,the jar and beat of the drilling tools,the pressure kick of the lifting tools and the drilling parameters and operations The rocks mentioned aboue may be broken into pieces,slack have no cementation,be easy to corrode and may have the ...