贯通式潜孔锤反循环钻进技术在复杂地层中的应用

Application of Hollow-through DTH Hammer Drilling with Reverse Circulation in Complex Formation

河北涿鹿锰银矿区地质条件复杂,干旱缺水,传统小口径金刚石钻进技术钻进效率低、成本高、施工周期长;此外,设计勘探孔为斜孔,增加了施工难度。采用贯通式潜孔锤全孔反循环钻进技术进行生产性试验,实践表明,该工艺方法能够解决该矿区的钻探难题,获得良好的应用效果。针对试验中出现的问题,提出一些改进意见。

The geological conditions in manganese and silver mineral in Zhuolu of Hebei Province is complicated with drought and water shortage, traditional small diameter diamond head drilling is not suitable because of its low drilling efficiency, high cost and long construction period. In addition, the exploratory hole is slant, which makes the construction more difficult. The hollow-through DTH hammer drilling techniques with whole hole reverse circulation is adopted, it is proved that this technique can resolve drilling difficulties. According to some problems appeared in experiment, improved advices are put forward.