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自1975年10月起,一年来,我们用人造金刚石钻头在崇义工区施工了三个钻孔.前两个孔因坍塌掉块无法施工而停钻,第三个孔穿过了复杂地层,施工质量达到地质要求.一、试验条件1.地层较为复杂,软硬不均,有坍塌掉块和漏失现象.常遇到的岩石有闪长岩、闪长玢岩、石灰岩、大理岩、磁铁矿等,可钻性6～9级.2.钻孔结构均用91毫米口径开孔,钻至基岩,下89毫米井壁管,用58.5毫米合金
In the year since October 1975, we have used synthetic diamond bits to drill three holes in the Chongyi work area, the first two holes have been drilled due to the inability to construct the collapsed blocks, the third hole passed through complex formations, Construction quality to meet the geological requirements First, the test conditions 1 stratum is more complex, soft and hard uneven, there are collapsed blocks and leakage phenomenon often encountered diorite, diorite rock, limestone, marble, magnetic Iron ore, drillability of 6 to 9. 2. Drilling structures are used 91 mm aperture drilling, drilling to bedrock, the next 89 mm wall tube, with 58.5 mm alloy