甘肃杨岭铁矿区复杂地层岩心钻探技术

Core drilling technology for complex strata in Yangling iron mine area， Gansu Province

摘要:

甘肃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，地层上部完整、研磨性较强，下部破碎、漏失严重，且表现出较强的铁磁性。针对上述复杂地层导致的钻头寿命低、孔内事故频发、磁干扰严重等施工难题，通过采取优化钻孔结构、合理选择钻探设备、改进冲洗液使用工艺等措施，有效解决了上述问题，同时对加快施工进度、提高钻探效率、节约施工成本也起到了积极的促进作用。该钻探技术经验对其他强磁性矿区的钻孔施工具有一定的借鉴意义。

Abstract:

The iron ore body in the Yangling Iron Mine area of Gansu Province is located in the fourth lithological segment of the Pingtoushan Formation of the Jixian system， which is composed of shallow metamorphic clastic rocks interbedded with muddy marble rock layers. The upper part of the strata is complete and has strong abrasiveness， while the lower part is severely fractured and leaked， exhibiting strong ferromagnetism. In response to the construction difficulties caused by the complex geological formations mentioned above， such as low drill bit lifespan， frequent accidents in the hole， and severe magnetic interference， measures such as optimizing drilling structure， selecting drilling equipment reasonably， and improving the use of flushing fluid have been taken to effectively solve the above problems. At the same time， it has played a positive role in accelerating construction progress， improving drilling efficiency， and saving construction costs. This drilling technology experience has certain reference significance for drilling construction in other strong magnetic mining areas.