甘肃杨岭铁矿复杂地层钻探施工技术
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青海省第二地质勘查院

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Drilling Construction Technology for Complex Strata of Yangling Iron Mine in Gansu Province
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Qinghai Second Nonferrous Geological Exploration Institute

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    摘要:

    杨岭铁矿区的铁矿体赋矿层位为蓟县系平头山组第四岩性段浅变质碎屑岩夹泥质大理岩岩层中。该矿区含铁岩系为石英岩型条纹状磁铁,磁性较强,该地层上部完整,钻进研磨性较强,钻进过程中钻头寿命很低。地层下部破碎,孔深超过300米后漏失严重,孔内不返浆,出现掉块、埋钻等难题。由于地层特殊钻孔内易发生飘钻现象,钻孔弯曲度控制难度大。通过优化钻孔结构,合理选择钻探设备、改进冲洗液使用工艺等,有效解决了上述问题与困难,加快了施工进度,提高了钻探效率,节约了施工成本。

    Abstract:

    The iron ore body in the Yangling Iron Mine area is located in the fourth lithological segment of the Pingtoushan Formation of the Jixian System, which is a shallow metamorphic clastic rock interbedded with muddy marble rock layers. The iron bearing rock series in the mining area is a quartzite type striped magnet with strong magnetism. The upper part of the formation is intact, and the drilling abrasiveness is strong. The lifespan of the drill bit is very low during the drilling process. The lower part of the formation is fractured, and after the hole depth exceeds 300 meters, serious leakage occurs. There is no return of slurry in the hole, resulting in difficulties such as falling blocks and burying drilling. Due to the special geological conditions, floating drilling is prone to occur in boreholes, making it difficult to control the curvature of the borehole. By optimizing the drilling structure, selecting drilling equipment reasonably, and improving the process of using flushing fluid, the above problems and difficulties have been effectively solved, the construction progress has been accelerated, drilling efficiency has been improved, and construction costs have been saved.

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  • 收稿日期:2024-03-04
  • 最后修改日期:2024-05-30
  • 录用日期:2024-05-31
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