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苏联克里夫巴斯在钻探磁铁矿床氧化带时,要求岩心采取率达到70%是很困难的。后来在该区采用了钢粒反循环钻进,在X-XI级铁角岩中使采取率由原来19%提高到86%(图1)
It is very difficult for the Soviet Union Cliff Bath to drill core oxidation rate of 70%. Later, steel-grain reverse circulation drilling was used in the area to increase the take-up rate from 19% to 86% in the X-XI grade iron horn rock (Figure 1)