小口径金刚石钻进,开孔时多用合金钻头.合金常发生崩刃,因此,下了套管后,必须用磨孔钻头将合金碎块磨掉.一般用平面磨孔钻头磨掉合金碎块,需要4个小时以上,加之小口径井壁间隙小,冲洗液在井壁环状间隙中的流速很大,合金碎块被冲起易造成夹钻或者把岩心管割坏.为了解决这些问题,我们使用了一种喷反捞取器,可将孔 Small diameter diamond drilling, drilling more alloy bits. Alloy chipping often occurs, so, after the casing, you must use the drill bits to wear off the alloy fragments. , Need more than 4 hours, combined with the small borehole wall clearance, flushing fluid in the annular ring gap in the flow rate is very large, the alloy pieces are washed up easily lead to cuttings or core tube cutting.In order to solve these problems , We used a jetter, which we could hole