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陕西省煤田地质局一九四队在黄陵二号矿利用大孔径瓦斯抽排放管道井插管空气反循环钻进工艺,在机械回转钻机上试验施工,取得了初步成效。黄陵二号
Shaanxi Provincial Bureau of Coal Geology 194 teams at the Huangling No. 2 mine using large-aperture gas pumping drainage tube wells air reverse circulation drilling process, the mechanical rotary drilling rig test construction and achieved initial success. Huang Ling II