煤矿井下复杂地层近水平钻孔绳索取心钻进工艺试验研究

Experimental research on wire-line coring drilling technology for near-horizontal boreholes in complex stratum in underground coal mine

摘要:

针对煤矿井下钻孔常规单管取心存在取心率低、效率低下、工人劳动强度大，煤层底板复杂地层以清水为冲洗介质的近水平绳索取心钻进成孔困难等问题，选用适合绳索取心钻进工艺的坑道钻机及配套近水平绳索取心钻具，配合合理的工艺流程进行试验。现场共施工了3个钻孔，成孔2个，孔深分别为151.5、194.5 m；岩心采取率分别为77%、89%，比单管取心提高24%以上；平均日进尺分别为22.7、36.6 m/d，比单管取心效率提高10 m/d以上。通过现场3个取心钻孔的试验，优选出了一套适用于煤矿井下复杂地层以清水为冲洗介质的近水平绳索取心钻探装备与工艺。

Abstract:

For conventional single-tube coring in coal mine underground drilling, there are several disadvantages such as low core recovery, low efficiency and high labor intensity, and difficulty in drilling holes in the near-horizontal coal seam floor with clean water as the drilling medium. Field tests were carried out by selecting and using professional near-horizontal wire-line core drilling rigs and wire-line core drilling tools. Three boreholes were drilled, and two of them were completed at the depth of 151.5m and 194.5m with the average core recovery of 77% and 89% respectively, more than 24% higher than that with the single tube. Average daily footage was 22.7m/d and 36.6m/d, more than 10% higher than that with the single tube. The wire-line coring drilling equipment and technologies for near-horizontal boreholes with clear water as the drilling medium in complex coal mine tunnels was optimized through the above field experiments.