小秦岭北矿带厚覆盖层钻探技术研究

Drilling technology for thick overburden in the northern mining belt of Xiaoqinling

摘要:

小秦岭北矿带上部覆盖层为第四系沉积物，其厚度700～950 m，钻探施工中经常出现卡钻、埋钻、塌孔等恶性事故，甚至造成钻孔报废，严重制约钻探效率，造成钻探成本过高。针对这些技术难点开展技术分析和研究，通过优化钻孔结构，采用适宜该矿区厚覆盖层的绳索取心钻进方法，合理选择护壁性能好的冲洗液等技术措施解决了厚覆盖层钻进难题，提高了钻探施工效率和质量，降低了工程成本。

Abstract:

The upper overburden in the northern mining belt of Xiaoqinling is quaternary sediments with thickness from 700 to 950m. Malignant incidents such as bit sticking, bit burial, hole caving often happen in drilling, and even result in the scrapping of the drilling hole, which seriously restricts drilling efficiency, leading to high drilling cost. In view of these technical difficulties, technical analysis and research were carried out. Through optimizing the borehole structure, adopting the wireline core drilling method suitable for the thick overburden in the mining area, properly choosing the drilling fluid with good borehole wall protection, and other technical measures, the difficulty in drilling the thick overburden was solved; meanwhile, the drilling efficiency and quality were improved, and the drilling cost was reduced.