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针对孔深超过1 000m时,原有绳钻设备、机具、工艺、技术无法达到钻探施工的要求。特别是施工中因裂隙、溶洞发育,常会发生涌、漏水严重,泥岩缩径,煤层多,粉煤多,易坍塌等情况。为解决该区钻孔施工难题,研究出绳索取心钻进钻具实行三级配套方案,在施工中采用合理的钻孔结构,用套管隔离不稳定地层,在钻进中运用金钢石钻头,在粉煤取心时选择底喷式(侧喷)金刚石钻头,保证泥浆质量等技术措施,并对不同地层条件下的钻进参数、冲洗液配方和钻进方法进行了介绍。通过大河矿区深部勘探应用实例,证明该方法可有效缩短工期,提高经济效益。
For the hole depth of more than 1 000 m, the original rope drilling equipment, machinery, technology, technology can not meet the drilling requirements. In particular, construction due to cracks, karst cave development, often occur Chung, serious water leakage, mudstone diameter, coal seam and more, easy collapse and so on. In order to solve the problem of borehole construction in this area, a three-level supporting program was developed to drill the coring bit of the rope, a reasonable drilling structure was used in the construction, the unstable strata were isolated by the casing, the diamond was used in the drilling Drill bit, select the bottom spray (side spray) diamond drill bit when the coal is coring, and ensure the mud quality and other technical measures. The drilling parameters, rinsing liquid formula and drilling method under different formation conditions are introduced. The case of deep exploration in Dahe mining area proves that the method can shorten the construction period and increase the economic benefit.