鄂尔多斯盆地纳岭沟铀矿床钻探施工难点及技术措施

Difficulties and technical measures in drilling construction of the Nalinggou uranium deposit in the Ordos Basin

鄂尔多斯盆地纳岭沟铀矿床勘探钻探施工存在松散砂岩岩心取心率低、卵砾石层钻进缓慢、泥岩地层钻进效率低和钻孔易偏斜问题。通过采用多种采心方法、冲洗液维护、优化钻头的使用和合理钻具级配等技术措施,在保直防偏、提高岩心采取率、提高卵砾石和泥岩地层钻进效率方面取得了很好的效果。较好地解决了施工中遇到的难点,提升了钻进效率和钻孔质量,积累了更多的砂岩钻探施工的经验。为今后在鄂尔多斯盆地北部砂岩型铀矿钻探施工提供了经验。

The exploration and drilling of the Nalinggou uranium deposit in the Ordos Basin has some technical problems,such as low heart rate of loose sandstone core,slow drilling efficiency of core-gravel layer,low drilling efficiency of mudstone formation and easy deviation of drilling hole.The project team adopts various technical measures,such as various core mining methods,mud maintenance,optimized use of drill bit and reasonable drilling tool grading.Good results have been achieved in the aspects of keeping straight and preventing deviation,improving the adoption rate,and improving the drilling efficiency of gravel and mudstone,which better solves the above difficulties encountered in the construction,improves the drilling efficiency and drilling quality,and accumulates more valuable experience in sandstone drilling construction,which provides construction experience for the future drilling construction of sandstone type uranium ore in the north of the Ordos Basin.