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一、前言在毛主席无产阶级革命路线指引下,我国地质勘探工作获得了迅速发展。特别是无产阶级文化大革命以来,各地质战线广大革命职工,广泛试验并推广了小口径金刚石钻进,取得了优异成绩,为我国社会主义建设提供了丰富的矿产资源。与大口径钢粒钻进相比,小口径金刚石钻进具有效率高、岩心采取率高、钻孔质量好、成本低、钢材消耗低、钻具轻便、
I. Foreword Guided by Chairman Mao’s proletarian revolutionary line, China’s geological prospecting work has enjoyed rapid growth. Since the Great Proletarian Cultural Revolution in particular, revolutionary workers and staff of all geophysical fronts have extensively experimented and promoted the drilling of small-caliber diamonds and have achieved excellent results. They have provided rich mineral resources for the socialist construction in our country. Compared with large-diameter steel grain drilling, small diameter diamond drilling has the advantages of high efficiency, high core take rate, good drilling quality, low cost, low consumption of steel, light drill,