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研究区钻探施工难度主要表现为:强风化地层占三分二以上,异常松散、破碎,遇冲洗液冲刷即成泥、流沙状,坍塌、埋孔情况频繁;钻孔上段涌水、中段全漏失;钻具因沙埋孔,经常不能到底,下套管、岩矿心采取亦因此而显得异常困难。以ZK4608孔为主,结合ZZ4404孔,对整个矿区的钻探技术研究结果进行了介绍,总结出该区段的钻探工艺为:跟管钻进、安装飞管、及时取粉、边钻边封、双液双泵速效封堵、无水泵干钻卡取等,从而圆满完成了区内18孔计4260m钻探施工任务。
Drilling construction difficulty in the study area is mainly as follows: strong weathered stratum accounts for more than two thirds, which is abnormally loose and crushed. When washed by flushing fluid, it becomes mud, flowing sand, collapsing and burying frequently; Drilling holes buried due to sand, often can not be in the end, the next casing, rock mining taken therefore also appears exceptionally difficult. ZK4608-based hole, combined with ZZ4404 hole, the entire mining area of the drilling technology research results were introduced, concluded that the section of the drilling process: with the pipe drilling, flying tube installation, and timely take powder, while drilling edge seal, Double-liquid double-pump quick-closing, dry pump without dry pump, and so on, which successfully completed the area 18 hole meter 4260m drilling construction tasks.