内蒙古哈达门沟矿区复杂地层钻探技术研究以ZK20312钻孔为例

Research on drilling technology of complex strata in Hadamengou mining area in Inner Mongolia：A case study of ZK20312

摘要:

内蒙古哈达门矿区地质条件复杂，区内矿层上下盘为绿泥石化蚀变带，厚度几十米至上百米，涉及破碎、漏失、水敏性地层多，钻探施工中缩径、漏失、坍塌现象普遍，严重影响了钻进效率。本文以该矿区ZK20312钻孔为例，经过2次废孔后，结合钻进难点提出了有针对性的解决措施，通过科学设计孔身结构、合理配置冲洗液、合理制定孔内事故应对措施，在第三次施工时取得了良好的效果，各项质量指标均符合设计要求。全面总结了该类型复杂地层的施工经验，可为其他类似条件施工提供参考。

关键词:复杂地层;水敏性地层;破碎地层;岩心钻探;孔身结构

Abstract:

The geological conditions of Hadamen mining area in Inner Mongolia are complex， and the upper and lower plates of the ore seam in the area are chlorite and petrified alteration belts， with a thickness of tens of meters to hundreds of meters， involving crushing， leakage and water-sensitive strata， and the phenomenon of diameter reduction， leakage and collapse in drilling construction is common， which seriously affects the drilling efficiency. Taking the ZK20312 drilling hole in the mining area as an example， after two waste holes， combined with the drilling difficulties， targeted solutions were proposed， and good results were achieved in the third construction through scientific design of the hole body structure， reasonable allocation of flushing fluid， and reasonable formulation of accident response measures in the hole， and all quality indicators met the design requirements. The construction experience of this type of complex formation is comprehensively summarized， which can provide reference for other similar conditions.

Key words:complex formation;water-sensitive formations;broken formations;core drilling;hole body structure