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我室在冶金部勘察技术研究所钻探室的协助下，于85年为攻克本溪南芬铁矿坚硬石英岩，研究设计了LT—3型孕镶人造金刚石钻头（钻头外貌见附图），通过批量试验取得了较好的钻进效果。一、试验条件1．岩层情况：试验孔段以石英岩为主，层厚一般为70～160m；其次是混合岩，还有少量炭质板岩、页岩夹层。石英岩为浅灰白色，中细粒结构块状构造，矿物成份由石英组成，粒径0.5～1.5mm，比较完整，但个别孔段因受断裂影响又极为破碎，漏失严
With the help of the drilling room of the Research Institute of Metallurgical Engineering and Technology, I studied and designed the LT-3 Inverted Synthetic Diamond Bit (see attached figure) for the purpose of capturing the hard quartzite of Benxi Nanfen Iron Mine in 1985, The batch test has achieved better drilling results. First, the test conditions 1. Rock formation: The pilot hole is dominated by quartzite and has a thickness of 70-160 m; followed by mixed rock with a few carbonaceous slate and shale intercalations. Quartzite is a light gray-white, medium-grained structure of massive structure, the mineral composition of quartz, particle size of 0.5 ~ 1.5mm, more complete, but due to the fracture of individual hole segment is extremely fragmented, leak tight