小秦岭复杂地层潜孔锤反循环钻探技术试验研究

Experimental Research on Reverse Circulation Drilling Technology with DTH Air Hammer Drill Bits in Complex Strata in Xiaoqinling Area

摘要:

贯通式潜孔锤反循环连续取心钻进技术具有效率高、钻孔质量好、钻探成本低等特点，尤其对复杂地层有较强的适应性。在反循环钻头及钻具进行优化组合的基础上，结合小秦岭金矿田程村矿区钻探项目开展野外生产试验。试验结果表明：潜孔锤反循环钻进系统对复杂地层条件适应性强，解决了该矿区的系列钻探技术难题。试验深化了对贯通式潜孔锤反循环钻探机理和反循环钻头结构的创新研究，对贯通式潜孔锤及配套钻具的进一步合理优化，实现高效率、低成本、短工期和良好的地质利用效果提供了技术支撑。

关键词:贯通式潜孔锤;反循环连续取心;复杂地层;小秦岭

Abstract:

The technology of reverse circulation continuous coring drilling with hollow-through DTH hammer has shown lots of peculiarities, such as the high drilling efficiency, good quality of borehole and low drilling cost, especially the unique adaptability while drilling in complex strata. In this paper, series of field tests have been conducted on the basis of optimized configuration of reverse circulation drill bits and drilling tools according to Tiancheng gold mine drilling project in Xiaoqinling area. The tests results have shown that the modified drilling system with hollow-through DTH hammer could be of high adaptability to drilling in complex conditions, which could effectively solve the problems of drilling in this ore district. What’s more, the results contribute to the further innovative research on the mechanism theory of hollow-through DTH hammer and the structural design of reverse circulation drilling bits. In addition, it could provide technical supports for the reasonable optimization of hollow-through DTH hammer and drilling tools configuration to achieve the high efficiency, low cost, short period and superior drilling effect in complex geological conditions.

Key words:hollow-through DTH hammer; reverse circulation continuous coring; complex strata; Xiaoqinling