我队在泽库老藏沟矿区用小口径金刚石钻进的 ZK403孔,在孔深280米左右(即设计矿层),所钻进岩层软硬不均,机械破碎严重,岩心用手轻轻一捻就成粉末。在钻进过程中,当岩矿心遇到冲洗液冲洗,容易流失,造成取心困难,连续出现空回次。小口径金刚石钻具钻进这类复杂地层时,提高岩矿心采取率就成为主要矛盾,而加强取心技 ZK403 hole drilled by small diameter diamond in the Lazigou mine area of ​​Zeku is about 280 meters deep (that is, the designed ore layer). The rock drilled is uneven in hardness and hardworking, and the core is broken by a hand lightly It becomes a powder. During the drilling process, when the heart of the rock meets the rinsing liquid flushing, it is easy to lose, resulting in difficult coring and continuous air return. Small diameter diamond drilling tools into such complex formations, increasing rock core mining rate has become the main contradiction, and strengthen the coring