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我队系打宣龙式铁矿，岩层为古老的震旦纪地层，而矿层更为脆碎，自53年以来，庞家堡矿区会使用过各种钻探法，但在硬脆碎矿层中除了使用黄泥粘矿心以外，别无有效的办法。自探矿工程参考资料介绍水城509队的孔底反循环钻进方法以后，我队彷作试用的结果证明，按原来规格及要求在五一三机田这一号孔试用了三个回次，纯钻进时间合计达4点20分钟，都不进尺。所采取的技术规范及试验条件为
My team is playing the Xuanlong iron ore mine, the rock is the ancient Sinian strata, and the ore is more brittle, since 53 years, the Pangjabu mining area will have used a variety of drilling methods, but in the hard brittle ore layer In addition to using yellow clay sticky core, there is no effective solution. Since the prospecting project reference materials introduced Shuicheng 509 teams hole bottom reverse circulation drilling method, the team I used as a pilot test results show that according to the original specifications and requirements in the 531 this hole trial three times, Pure drilling time totaling 4:00 20 minutes, do not enter the ruler. The adopted technical specifications and test conditions are